Unchecked cast: ‘java. lang. Object‘ to ‘java. util. Map＜java. lang. String,java. lang. Object＞‘ 解决

最新推荐文章于 2025-07-09 10:27:38 发布
最新推荐文章于 2025-07-09 10:27:38 发布
阅读量445 收藏 1
点赞数 1
CC 4.0 BY-SA版权
文章标签： java python 前端
版权声明：本文为博主原创文章，遵循 CC 4.0 BY 版权协议，转载请附上原文出处链接和本声明。
本文链接：https://blog.youkuaiyun.com/qq_45171957/article/details/144141520

代码中使用Feign请求目标接口，feign返回的数据的getData部分是一个Object对象， 需要转换成JsonObject才能获取里面的值，直接强制转换会有Unchecked cast的警告，很麻烦。


JSONObject jsonObject = new JSONObject((Map<String, Object>) res.getData());
				boolean result = Boolean.parseBoolean(String.valueOf(jsonObject.get("result")));

查了一下，最简单的方式是把代码改成:

JSONObject jsonObject = JSONObject.parseObject(JSONObject.toJSONString(res.getData()));
				boolean result = Boolean.parseBoolean(String.valueOf(jsonObject.get("result")));
				```
把目标Object先转换成Json字符串再把Json字符串转换成JSONObject就不会报警了。
java object 转map对象,将Java对象转换为Java Map< String，Object>
weixin_42299066的博客
02-26 1246
I am using org.eclipse.jetty.util.ajax.JSON to parse JSON text.But the JSON.parse(string) method produces an Object and I need it as a Map.Internally it is an object of exactly the mentioned class.But...
JAVA SE 4.集合及其使用方式
举目沧桑的博客
07-25 777
5.Cloneable接口实现了该接口的类可以显示的调用Object.clone()方法，合法的对该类实例进行字段复制，如果没有实现Cloneable接口的实例上调用Obejct.clone()方法，会抛出CloneNotSupportException异常。TreeMap是基于红黑树的实现，也是记录了key-value的映射关系，该映射根据key的自然排序进行排序或者根据构造方法中传入的比较器进行排序，也就是说TreeMap是有序的key-value集合。.........................
解决Java中的“Unchecked cast: java.lang.Object to java.util.List”问题
猫头虎技术团队：授渔优于赠鱼，兴趣引领智慧，探索之乐尤显珍贵。商务合作+：Libin9iOak ，万粉变现+：优快云WF，猫头虎承诺每年免费为100名C站创作者做账号流量诊断服务！全网搜：猫头虎技术团队，点击文章底部名片或直接私信我一切皆可谈，快找虎哥！
08-17 2763
Java的警告是为了提醒开发者注意潜在的类型不匹配问题。理解其原因并采取适当的措施可以确保代码的类型安全性并避免运行时错误。在做类型转换时，始终确保你了解数据的来源和它可能的真实类型，以避免不必要的问题。
Java中未检查的强制类型转换警告处理
qq_29715355的博客
05-27 488
在Spring应用上下文文件中定义一个Map</
Java中，未检查的转换: ‘java.lang.Object‘ 转换为 ‘java.util.Map＜java.lang.String,java.lang.String＞‘
最新发布
BillKu的博客
07-09 881
在Java中，"未检查的转换"（unchecked conversion）警告通常出现在泛型类型转换时，编译器无法验证类型安全性的场景。具体到将转换为。
Unchecked cast: 'java.lang.Object' to 'java.util.List<java.lang.xxx>'
请叫我大师兄
07-14 2万+
在 intellij idea 编辑器中，把一个Map类型的数据，强制类型转换的时候。 在中不想看到代码的如下警告的解决方法： 警告信息------------- 简单警告： Unchecked cast: 'java.lang.Object' to 'java.util.List' 点开查看详细警告： Unchecked cast: 'java.lang.Object'
已解决Java中的“Unchecked cast: java.lang.Object to java.util.List”问题，亲测有效！！！已解决
PythonAigc的博客
04-26 2397
在Java中，当你尝试将一个Object类型的对象强制转换为List类型，而编译器无法确保这种转换的安全性时，就会遇到“Unchecked cast: java.lang.Object to java.util.List”的警告。这通常发生在泛型被擦除的情况下，或者当你从原始类型（没有使用泛型）的集合或方法中获取对象时。 解决这个问题的正确方法取决于你的具体使用场景，但通常涉及以下几个步骤：
Unchecked cast: java.lang.Object to java.util.List问题的解决
lydms的博客
01-11 6万+
包含5种解决方式
未检查的转换: ‘java.lang.Object‘ 转换为 ‘java.util.List
二十一克阳光！的博客
08-23 2863
在这个示例中，我们使用JSON.toJSONString()将object对象转换为JSON字符串，然后使用JSON.parseObject()将JSON字符串转换为List对象。需要注意的是，为了正确地解析泛型类型，我们使用了TypeReference类作为parseObject()方法的第二个参数。TypeReference类是fastjson提供的一个工具类，用于解析泛型类型。在TypeReference的构造函数中，我们传入List作为泛型类型的实际参数。
Unchecked cast: 'java.util.Map' to 'java.util.Map<java.lang.String,java.lang.Object>'
03-16
<think>嗯，我现在遇到了一个Java的警告：“Unchecked cast: 'java.util.Map' to 'java.util.Map<java.lang.String,java.lang.Object>'”。这到底是什么意思呢？让我仔细想想。 首先，我知道在Java中，泛型是从Java...
package com.example.kucun2.entity.data; import android.content.Context; import android.util.Log; import com.example.kucun2.entity.*; import com.example.kucun2.function.MyAppFnction; import com.google.gson.Gson; import com.google.gson.reflect.TypeToken; import java.io.IOException; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.lang.reflect.Type; import java.util.*; import okhttp3.Call; import okhttp3.Callback; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response; public class Data { // 数据集合声明（保持原有属性名不变） public static SynchronizedList<Bancai> bancais = new SynchronizedList<>(Bancai.class); public static SynchronizedList<Caizhi> caizhis = new SynchronizedList<>(Caizhi.class); public static SynchronizedList<Mupi> mupis = new SynchronizedList<>(Mupi.class); public static SynchronizedList<Chanpin> chanpins = new SynchronizedList<>(Chanpin.class); public static SynchronizedList<Chanpin_Zujian> chanpinZujians = new SynchronizedList<>(Chanpin_Zujian.class); public static SynchronizedList<Dingdan> dingdans = new SynchronizedList<>(Dingdan.class); public static SynchronizedList<Dingdan_Chanpin> dingdanChanpins = new SynchronizedList<>(Dingdan_Chanpin.class); public static SynchronizedList<Dingdan_Bancai> dingdanBancais = new SynchronizedList<>(Dingdan_Bancai.class); public static SynchronizedList<Kucun> kucuns = new SynchronizedList<>(Kucun.class); public static SynchronizedList<Zujian> zujians = new SynchronizedList<>(Zujian.class); public static SynchronizedList<User> users = new SynchronizedList<>(User.class); public static SynchronizedList<Jinhuo> jinhuoList = new SynchronizedList<>(Jinhuo.class); private static final Gson gson = new Gson(); private static final OkHttpClient client = new OkHttpClient(); private static final String TAG = "DataLoader"; // 加载所有数据的方法 public static void loadAllData(Context context, LoadDataCallback callback) { // 开始批量模式 for (SynchronizedList<?> list : getAllSyncLists()) { list.beginBatch(); } String url = MyAppFnction.getStringResource("String", "url") + MyAppFnction.getStringResource("String", "url_all"); Request request = new Request.Builder() .url(url) .build(); client.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { Log.e(TAG, "Failed to load data", e); if (callback != null) callback.onFailure(); } @Override public void onResponse(Call call, Response response) throws IOException { parseAndAssignData(response.body().string(), context,callback); // 结束批量模式（会触发一次全量同步） for (SynchronizedList<?> list : getAllSyncLists()) { list.endBatch(); } if (callback != null) callback.onSuccess(); } }); } // 获取所有同步列表的方法 private static List<SynchronizedList<?>> getAllSyncLists() { return Arrays.asList(bancais, caizhis, mupis, chanpins, chanpinZujians, dingdans, dingdanChanpins, dingdanBancais, kucuns, zujians, users, jinhuoList); } // 解析并赋值数据 private static void parseAndAssignData(String jsonData, Context context, LoadDataCallback callback) { // 创建包含所有数据类型的TypeToken Type informationType = new TypeToken<Information<AllDataResponse>>(){}.getType(); Information<AllDataResponse> information = gson.fromJson(jsonData, informationType); if (information == null || information.getData() == null || information.getStatus() != 200) { Log.e(TAG, "Invalid response data"); if (callback != null) callback.onFailure(); return; } AllDataResponse allData = information.getData(); // 赋值到对应的列表（使用安全方法保持已有引用） updateList(bancais, allData.bancais); updateList(caizhis, allData.caizhis); updateList(mupis, allData.mupis); updateList(chanpins, allData.chanpins); updateList(chanpinZujians, allData.chanpin_zujians); updateList(dingdans, allData.dingdans); updateList(dingdanChanpins, allData.dingdan_chanpins); updateList(dingdanBancais, allData.dingdan_bancais); updateList(kucuns, allData.kucuns); updateList(zujians, allData.zujians); updateList(users, allData.users); updateList(jinhuoList, allData.jinhuos); resolveReferences(); if (callback != null) callback.onSuccess(); } // 更新列表内容但保持对象引用不变 private static <T> void updateList(List<T> existingList, List<T> newList) { if (newList == null) return; existingList.clear(); for (T item : newList) { existingList.add(item); // 会被包装成代理对象 } } // 解析对象间的引用关系（使用ID关联） // 改进的引用解析方法 private static void resolveReferences() { // 创建全局对象映射 Map<Integer, EntityClassGrassrootsid> globalMap = new HashMap<>(); // 填充全局映射表 addToGlobalMap(globalMap, bancais); addToGlobalMap(globalMap, caizhis); addToGlobalMap(globalMap, mupis); addToGlobalMap(globalMap, chanpins); addToGlobalMap(globalMap, zujians); addToGlobalMap(globalMap, dingdans); addToGlobalMap(globalMap, kucuns); addToGlobalMap(globalMap, users); // 解析所有实体的引用 resolveListReferences(bancais, globalMap); resolveListReferences(kucuns, globalMap); resolveListReferences(dingdanChanpins, globalMap); resolveListReferences(chanpinZujians, globalMap); resolveListReferences(dingdanBancais, globalMap); resolveListReferences(jinhuoList, globalMap); } // 添加对象到全局映射表 private static void addToGlobalMap(Map<Integer, EntityClassGrassrootsid> map, SynchronizedList<?> list) { for (Object item : list) { Object original = getOriginalFromList(list, item); if (original instanceof EntityClassGrassrootsid) { EntityClassGrassrootsid entity = (EntityClassGrassrootsid) original; map.put(entity.getId(), entity); } } } // 解析列表中所有实体的引用 private static void resolveListReferences(SynchronizedList<?> list, Map<Integer, EntityClassGrassrootsid> globalMap) { for (Object item : list) { Object original = getOriginalFromList(list, item); resolveEntityReferences(original, globalMap); } } // 安全获取原始对象（无需类型转换） @SuppressWarnings("unchecked") private static <T> T getOriginalFromList(SynchronizedList<?> list, Object item) { try { // 使用反射调用getOriginal方法 Method getOriginal = list.getClass().getMethod("getOriginal", Object.class); return (T) getOriginal.invoke(list, item); } catch (Exception e) { Log.e("Data", "Failed to get original object", e); return (T) item; } } //解析集合中的引用 private static void resolveCollectionReferences(Collection<?> collection, Map<Integer, EntityClassGrassrootsid> globalMap) { for (Object item : collection) { if (item instanceof EntityClassGrassrootsid) { EntityClassGrassrootsid ref = (EntityClassGrassrootsid) item; EntityClassGrassrootsid resolved = globalMap.get(ref.getId()); if (resolved != null && ref.getClass().isInstance(resolved)) { // 注意：直接替换集合元素需要特殊处理 // 实际项目应考虑使用CopyOnWrite集合或创建新集合 if (collection instanceof List) { int index = ((List<?>) collection).indexOf(ref); if (index != -1) { try { ((List<Object>) collection).set(index, resolved); } catch (Exception e) { Log.e("Data", "Failed to update collection", e); } } } } } } } // 解析单个实体的引用 private static void resolveEntityReferences(Object entity, Map<Integer, EntityClassGrassrootsid> globalMap) { if (entity == null) return; Class<?> clazz = entity.getClass(); for (Field field : clazz.getDeclaredFields()) { try { field.setAccessible(true); // 处理基本类型字段 if (EntityClassGrassrootsid.class.isAssignableFrom(field.getType())) { EntityClassGrassrootsid ref = (EntityClassGrassrootsid) field.get(entity); if (ref != null && ref.getId() != null) { EntityClassGrassrootsid resolved = globalMap.get(ref.getId()); if (resolved != null && field.getType().isInstance(resolved)) { field.set(entity, resolved); } } } // 处理集合类型字段 else if (Collection.class.isAssignableFrom(field.getType())) { Collection<?> collection = (Collection<?>) field.get(entity); if (collection != null) { resolveCollectionReferences(collection, globalMap); } } } catch (Exception e) { Log.e("Data", "Error resolving field: " + field.getName(), e); } } } // 创建ID到对象的映射 private static <T extends EntityClassGrassrootsid> Map<Integer, T> createIdMap(List<T> list) { Map<Integer, T> map = new HashMap<>(); for (T item : list) { map.put(item.getId(), item); } return map; } // 回调接口 public interface LoadDataCallback { void onSuccess(); void onFailure(); } private static void resolveFields(Object entity, Map<Integer, EntityClassGrassrootsid> globalMap) { for (Field field : entity.getClass().getDeclaredFields()) { if (EntityClassGrassrootsid.class.isAssignableFrom(field.getType())) { try { field.setAccessible(true); EntityClassGrassrootsid ref = (EntityClassGrassrootsid) field.get(entity); if (ref != null) { EntityClassGrassrootsid resolved = globalMap.get(ref.getId()); if (resolved != null && field.getType().isAssignableFrom(resolved.getClass())) { field.set(entity, resolved); } } } catch (Exception e) { Log.e("Data", "Error resolving reference", e); } } } } // 内部类用于解析JSON响应 public static class AllDataResponse { public List<Bancai> bancais; public List<Caizhi> caizhis; public List<Mupi> mupis; public List<Chanpin> chanpins; public List<Chanpin_Zujian> chanpin_zujians; public List<Dingdan> dingdans; public List<Dingdan_Chanpin> dingdan_chanpins; public List<Dingdan_Bancai> dingdan_bancais; public List<Kucun> kucuns; public List<Zujian> zujians; public List<User> users; public List<Jinhuo> jinhuos; } }package com.example.kucun2.entity.data; import android.util.Log; import androidx.annotation.NonNull; import com.google.gson.Gson; import java.io.IOException; import java.lang.reflect.Method; import java.lang.reflect.ParameterizedType; import java.lang.reflect.Type; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.ListIterator; import java.util.Map; import java.util.Set; import okhttp3.Call; import okhttp3.Callback; import okhttp3.MediaType; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.RequestBody; import okhttp3.Response; /** * 支持数据变更自动同步的泛型集合类 * @param <T> 继承自 SynchronizableEntity 的实体类型 */ public class SynchronizedList<T extends SynchronizableEntity> implements List<T> { private final List<T> list = new ArrayList<>(); private final OkHttpClient client = new OkHttpClient(); private static final Gson gson = new Gson(); private static final MediaType JSON = MediaType.get("application/json; charset=utf-8"); private final Class<T> entityClass; // 类型标记 // 添加批量操作模式标志 private boolean batchMode = false; // 属性变更监听器 private final List<PropertyChangeListener<T>> listeners = new ArrayList<>(); public SynchronizedList(Class<T> entityClass) { Type superClass = getClass().getGenericSuperclass(); ParameterizedType type = (ParameterizedType) superClass; Type[] typeArgs = type.getActualTypeArguments(); this.entityClass = (Class<T>) typeArgs[0]; } // 安全的类型转换方法 private T safeCast(Object o) { if (o != null && entityClass.isInstance(o)) { return entityClass.cast(o); } return null; } public interface PropertyChangeListener<T> { void onPropertyChange(T entity, String propertyName, Object oldValue, Object newValue); } public void addPropertyChangeListener(PropertyChangeListener<T> listener) { listeners.add(listener); } public void removePropertyChangeListener(PropertyChangeListener<T> listener) { listeners.remove(listener); } // 添加方法来获取原始对象 @SuppressWarnings("unchecked") public T getOriginal(T proxy) { if (proxy == null) return null; // 检查是否为代理对象 if (java.lang.reflect.Proxy.isProxyClass(proxy.getClass())) { try { java.lang.reflect.InvocationHandler handler = java.lang.reflect.Proxy.getInvocationHandler(proxy); if (handler instanceof IProxyHandler) { Object original = ((IProxyHandler) handler).getOriginal(); // 安全类型检查 if (entityClass.isInstance(original)) { return (T) original; } } } catch (Exception e) { Log.e("SynchronizedList", "Failed to get proxy handler", e); } } return proxy; } /** * 同步实体到后端 * * @param entity 要同步的实体 */ private void syncEntity(T entity) { if (batchMode) return; String operation = "add"; T originalEntity = getOriginal(entity); String endpoint = originalEntity.getEndpoint(operation); String json = gson.toJson(originalEntity); RequestBody body = RequestBody.create(json, JSON); Request request = new Request.Builder() .url(endpoint) .method(getHttpMethod(operation), body) .build(); client.newCall(request).enqueue(new Callback() { @Override public void onFailure(@NonNull Call call, @NonNull IOException e) { Log.e("SynchronizedList", "同步失败: " + entity.getClass().getSimpleName(), e); } @Override public void onResponse(@NonNull Call call, @NonNull Response response) { if (!response.isSuccessful()) { Log.e("SynchronizedList", "同步失败: " + response.code() + " - " + response.message()); } response.close(); } }); } // 添加用于批量操作的方法 public void beginBatch() { this.batchMode = true; } public void endBatch() { this.batchMode = false; // 批量结束后触发一次全量同步 syncAllEntities(); } private void syncAllEntities() { for (T entity : list) { syncEntity(entity); } } private String getHttpMethod(String operation) { switch (operation) { case "add": return "POST"; case "update": return "PUT"; case "delete": return "DELETE"; default: return "POST"; } } // 获取类实现的所有接口（包括父类接口） private Class<?>[] getInterfaces(Class<?> clazz) { Set<Class<?>> interfaces = new HashSet<>(); while (clazz != null) { interfaces.addAll(Arrays.asList(clazz.getInterfaces())); clazz = clazz.getSuperclass(); } return interfaces.toArray(new Class<?>[0]); } /** * 创建代理对象，用于监听属性变更 */ // 优化 createProxy 方法 private T createProxy(T original) { if (original == null) return null; if (!entityClass.isInstance(original)) { throw new IllegalArgumentException("Invalid entity type"); } // 为原始对象创建代理 return (T) java.lang.reflect.Proxy.newProxyInstance( original.getClass().getClassLoader(), getInterfaces(original.getClass()), new EntityProxyHandler(original) ); // if (!entityClass.isInstance(original)) { // throw new IllegalArgumentException("Invalid entity type"); // } // // 这里使用动态代理模式监听setter方法调用 // return (T) java.lang.reflect.Proxy.newProxyInstance( // original.getClass().getClassLoader(), // original.getClass().getInterfaces(), // (proxy, method, args) -> { // // 只拦截setter方法 // if (method.getName().startsWith("set") && args.length == 1) { // String propertyName = method.getName().substring(3); // propertyName = propertyName.substring(0, 1).toLowerCase() + propertyName.substring(1); // // // 获取旧值 // Object oldValue = original.getClass() // .getMethod("get" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1)) // .invoke(original); // // // 调用原始方法 // Object result = method.invoke(original, args); // // // 触发监听器 // for (PropertyChangeListener<T> listener : listeners) { // listener.onPropertyChange(original, propertyName, oldValue, args[0]); // } // // // 自动同步到后端 // syncEntity(original); // return result; // } // return method.invoke(original, args); // } // ); } // 以下是List接口的实现 @Override public int size() { return list.size(); } @Override public boolean isEmpty() { return list.isEmpty(); } @Override public boolean contains(Object o) { return list.contains(o); } @NonNull @Override public Iterator<T> iterator() { return list.iterator(); } @NonNull @Override public Object[] toArray() { return list.toArray(); } @NonNull @Override public <T1> T1[] toArray(@NonNull T1[] a) { return list.toArray(a); } @Override public boolean add(T t) { T proxy = createProxy(t); boolean result = list.add(proxy); if (!batchMode) { syncEntity(proxy); } return result; // 添加时创建代理 } @Override public boolean remove(Object o) { T entity = safeCast(o); if (entity != null) { syncEntity((T) entity); // 删除前同步 } return list.remove(o); } @Override public boolean containsAll(@NonNull Collection<?> c) { return list.containsAll(c); } @Override public boolean addAll(@NonNull Collection<? extends T> c) { boolean modified = false; for (T t : c) { modified |= add(t); } return modified; } @Override public boolean addAll(int index, @NonNull Collection<? extends T> c) { for (T t : c) { add(index++, t); } return true; } @Override public boolean removeAll(@NonNull Collection<?> c) { for (Object o : c) { T entity = safeCast(o); if (entity != null) { syncEntity(entity); } } return list.removeAll(c); } @Override public boolean retainAll(@NonNull Collection<?> c) { List<T> toRemove = new ArrayList<>(); for (T t : list) { if (!c.contains(t)) { toRemove.add(t); } } // 使用安全转换 for (T entity : toRemove) { syncEntity(entity); } return list.retainAll(c); } @Override public void clear() { for (T t : list) { syncEntity(t); // 清空前同步 } list.clear(); } @Override public T get(int index) { return list.get(index); } @Override public T set(int index, T element) { T old = list.set(index, createProxy(element)); if (old != null) { syncEntity(old); // 替换旧元素前同步 } return old; } @Override public void add(int index, T element) { list.add(index, createProxy(element)); } @Override public T remove(int index) { T removed = list.remove(index); if (removed != null) { syncEntity(removed); // 删除前同步 } return removed; } @Override public int indexOf(Object o) { return list.indexOf(o); } @Override public int lastIndexOf(Object o) { return list.lastIndexOf(o); } @NonNull @Override public ListIterator<T> listIterator() { return list.listIterator(); } @NonNull @Override public ListIterator<T> listIterator(int index) { return list.listIterator(index); } @NonNull @Override public List<T> subList(int fromIndex, int toIndex) { return list.subList(fromIndex, toIndex); } // 触发属性变更通知 // 添加类型安全的属性监听 private void firePropertyChange(T entity, String propertyName, Object oldValue, Object newValue) { if (oldValue != null && newValue != null && oldValue.equals(newValue)) { return; // 值未变化时不触发监听 } for (PropertyChangeListener<T> listener : listeners) { try { listener.onPropertyChange(entity, propertyName, oldValue, newValue); } catch (Exception e) { Log.e("SynchronizedList", "Listener error", e); } } } // 修改代理处理器以支持获取原始对象 /* 完整的 EntityProxyHandler 实现 */ private class EntityProxyHandler implements IProxyHandler, java.lang.reflect.InvocationHandler { private final T original; private final Map<String, Object> propertyValues = new HashMap<>(); public EntityProxyHandler(T original) { this.original = original; // 初始化属性缓存 for (Method method : original.getClass().getMethods()) { if (method.getName().startsWith("get") && method.getParameterCount() == 0) { try { String propName = method.getName().substring(3); propName = Character.toLowerCase(propName.charAt(0)) + propName.substring(1); propertyValues.put(propName, method.invoke(original)); } catch (Exception e) { Log.e("ProxyHandler", "Failed to cache property", e); } } } } @Override public T getOriginal() { return original; } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { String methodName = method.getName(); // 处理 setter 方法 if (methodName.startsWith("set") && args != null && args.length == 1) { String propertyName = methodName.substring(3); propertyName = Character.toLowerCase(propertyName.charAt(0)) + propertyName.substring(1); Object oldValue = propertyValues.get(propertyName); Object newValue = args[0]; // 调用原始方法 Object result = method.invoke(original, args); propertyValues.put(propertyName, newValue); // 触发监听 firePropertyChange(original, propertyName, oldValue, newValue); // 非批量模式下自动同步 if (!batchMode) { syncEntity(original); } return result; } // 特殊处理 getOriginal 方法 if ("getOriginal".equals(methodName)) { return original; } // 处理 getter 方法（使用缓存） if (methodName.startsWith("get") && method.getParameterCount() == 0) { String propertyName = methodName.substring(3); propertyName = Character.toLowerCase(propertyName.charAt(0)) + propertyName.substring(1); return propertyValues.getOrDefault(propertyName, method.invoke(original)); } return method.invoke(original, args); } private Object getPropertyValue(String propertyName) { String getterName = "get" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1); try { Method getter = original.getClass().getMethod(getterName); return getter.invoke(original); } catch (Exception e) { Log.e("ProxyHandler", "Failed to get property value: " + propertyName, e); return null; } } } // 在 SynchronizedList 类中添加 private interface IProxyHandler { Object getOriginal(); } }app/all返回json数据：{ “status”: “200”, “text”: “success”, “data”: { “bancais”: [ { “houdu”: 15, “mupi1”: { “id”: 1 }, “mupi2”: { “id”: 1 }, “caizhi”: { “id”: 1 }, “kucun”: { “id”: 1 }, “id”: 1 }, { “houdu”: 15, “mupi1”: { “id”: 2 }, “mupi2”: { “id”: 2 }, “caizhi”: { “id”: 1 }, “kucun”: { “id”: 2 }, “id”: 2 } ], “dingdans”: [ { “dingdanChanpinZujian”: [ ], "number": "直接入库", "id": 1, "dingdanChanpin": [ {"id":1} ] } ], "mupis": [ { "name": "千和板", "id": 1, "you": null }, { "name": "桃花芯", "id": 2, "you": null }, { "name": "杉木", "id": 3, "you": null } ], "chanpins": [ { "chanpinZujian": [ { "id": 1 } ], "bianhao": "直接入库", "id": 1, "dingdanChanpin": [ {"id":1} ] } ], "kucuns": [ { "bancai": { "Id": 1 }, "shuliang": 12, "id": 1 }, { "bancai": { "Id": 2 }, "shuliang": 32, "id": 2 } ], "chanpin_zujians": [ { "chanpin": { "Id": 1 }, "bancai": { "id": 1 }, "id": 1, "zujian": { "Id": 1 }, "one_howmany": 15 } ], "zujians": [ { "chanpinZujian": [ { "id": 1 } ], "name": "前板", "id": 1 } ], "caizhis": [ { "name": "千和板", "bancai": [ { "id": 1 }, { "id": 2 } ], "id": 1 }, { "name": "杉木", "bancai": [ ], "id": 3 }, { "name": "桃花芯", "bancai": [ ], "id": 2 } ], "users": [ { "role": 0, "name": "超管", "id": 1, "andy": "123456" } ] } } <string name=“url”>https://tian.sef/Kucun2</string> <string name=“url_all”>/app/all</string> <string name=“url_bancis”>/app/bancai/all</string> <string name=“url_caizhis”>/app/caizhi/all</string> <string name=“url_mupis”>/app/mupi/all</string> <string name=“url_dingdans”>/app/dingdan/all</string> <string name=“url_chanpins”>/app/chanpin/all</string> <string name=“url_zujians”>/app/zujian/all</string> <string name="url_chanpin_zujians">/app/chanpin_zujian/all</string> <string name="url_dingdan_zujians">/app/dingdan_zujian/all</string> <string name="url_dingdan_chanpins">/app/dingdan_chanpin/all</string> <string name="url_jinhuos">/app/jinhuo/all</string> <string name="url_add_bancai">/app/bancai/add</string> <string name="url_add_dingdan">/app/dingdan/add</string> <string name="url_add_chanpin">/app/chanpin/add</string> <string name="url_add_zujian">/app/zujian/add</string> <string name="url_add_caizhi">/app/caizhi/add</string> <string name="url_add_mupi">/app/mupi/add</string> <string name="url_add_dingdan_chanpin">/app/dingdan_chanpi/add</string> <string name="url_add_dingdan_zujian">/app/dingdan_zujian/add</string> <string name="url_add_chanpin_zujian">/app/chanpin_zujian/add</string> <string name="url_add_jinhuo">/app/jinhuo/add</string> <string name="url_login">/user/login</string> 开始是填充数据
06-10
private final Map<String, Object> propertyValues = new HashMap<>(); public EntityProxyHandler(T original) { this.original = original; // 初始化属性缓存 for (Method method : original.getClass()....
package com.example.kucun2.entity.data; import android.util.Log; import androidx.annotation.NonNull; import com.google.gson.Gson; import java.io.IOException; import java.lang.reflect.Method; import java.lang.reflect.ParameterizedType; import java.lang.reflect.Proxy; import java.lang.reflect.Type; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.ListIterator; import java.util.Map; import java.util.Set; import okhttp3.Call; import okhttp3.Callback; import okhttp3.MediaType; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.RequestBody; import okhttp3.Response; /** * 支持数据变更自动同步的泛型集合类 * @param <T> 继承自 SynchronizableEntity 的实体类型 */ public class SynchronizedList<T extends SynchronizableEntity> implements List<T> { private final List<T> list = new ArrayList<>(); private final OkHttpClient client = new OkHttpClient(); private static final Gson gson = new Gson(); private static final MediaType JSON = MediaType.get("application/json; charset=utf-8"); private final Class<T> entityClass; // 类型标记 // 添加批量操作模式标志 private boolean batchMode = false; // 属性变更监听器 private final List<PropertyChangeListener<T>> listeners = new ArrayList<>(); // 直接接受Class参数的构造函数 public SynchronizedList(Class<T> entityClass) { this.entityClass = entityClass; } // 安全的类型转换方法 private T safeCast(Object o) { if (o != null && entityClass.isInstance(o)) { return entityClass.cast(o); } return null; } public interface PropertyChangeListener<T> { void onPropertyChange(T entity, String propertyName, Object oldValue, Object newValue); } public void addPropertyChangeListener(PropertyChangeListener<T> listener) { listeners.add(listener); } public void removePropertyChangeListener(PropertyChangeListener<T> listener) { listeners.remove(listener); } // 添加方法来获取原始对象 @SuppressWarnings("unchecked") public T getOriginal(T proxy) { if (proxy == null) return null; // 检查是否为代理对象 if (java.lang.reflect.Proxy.isProxyClass(proxy.getClass())) { try { java.lang.reflect.InvocationHandler handler = java.lang.reflect.Proxy.getInvocationHandler(proxy); if (handler instanceof IProxyHandler) { Object original = ((IProxyHandler) handler).getOriginal(); // 安全类型检查 if (entityClass.isInstance(original)) { return (T) original; } } } catch (Exception e) { Log.e("SynchronizedList", "Failed to get proxy handler", e); } } return proxy; } /** * 同步实体到后端 * * @param entity 要同步的实体 */ private void syncEntity(T entity) { if (batchMode) return; String operation = "add"; T originalEntity = getOriginal(entity); String endpoint = originalEntity.getEndpoint(operation); String json = gson.toJson(originalEntity); RequestBody body = RequestBody.create(json, JSON); Request request = new Request.Builder() .url(endpoint) .method(getHttpMethod(operation), body) .build(); client.newCall(request).enqueue(new Callback() { @Override public void onFailure(@NonNull Call call, @NonNull IOException e) { Log.e("SynchronizedList", "同步失败: " + entity.getClass().getSimpleName(), e); } @Override public void onResponse(@NonNull Call call, @NonNull Response response) { if (!response.isSuccessful()) { Log.e("SynchronizedList", "同步失败: " + response.code() + " - " + response.message()); } response.close(); } }); } // 添加用于批量操作的方法 public void beginBatch() { this.batchMode = true; } public void endBatch() { this.batchMode = false; // 批量结束后触发一次全量同步 syncAllEntities(); } private void syncAllEntities() { for (T entity : list) { syncEntity(entity); } } private String getHttpMethod(String operation) { switch (operation) { case "add": return "POST"; case "update": return "PUT"; case "delete": return "DELETE"; default: return "POST"; } } // 获取类实现的所有接口（包括父类接口） private Class<?>[] getInterfaces(Class<?> clazz) { Set<Class<?>> interfaces = new HashSet<>(); while (clazz != null) { interfaces.addAll(Arrays.asList(clazz.getInterfaces())); clazz = clazz.getSuperclass(); } return interfaces.toArray(new Class<?>[0]); } /** * 创建代理对象，用于监听属性变更 */ // 优化 createProxy 方法 private T createProxy(T original) { if (original == null) return null; // 确保代理对象实现原始对象的所有接口+目标接口 Class<?>[] interfaces = new Class<?>[]{ SynchronizableEntity.class, // 强制实现目标接口 entityClass // 实体类或接口 }; return (T) Proxy.newProxyInstance( original.getClass().getClassLoader(), interfaces, new EntityProxyHandler(original) ); // if (!entityClass.isInstance(original)) { // throw new IllegalArgumentException("Invalid entity type"); // } // // 这里使用动态代理模式监听setter方法调用 // return (T) java.lang.reflect.Proxy.newProxyInstance( // original.getClass().getClassLoader(), // original.getClass().getInterfaces(), // (proxy, method, args) -> { // // 只拦截setter方法 // if (method.getName().startsWith("set") && args.length == 1) { // String propertyName = method.getName().substring(3); // propertyName = propertyName.substring(0, 1).toLowerCase() + propertyName.substring(1); // // // 获取旧值 // Object oldValue = original.getClass() // .getMethod("get" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1)) // .invoke(original); // // // 调用原始方法 // Object result = method.invoke(original, args); // // // 触发监听器 // for (PropertyChangeListener<T> listener : listeners) { // listener.onPropertyChange(original, propertyName, oldValue, args[0]); // } // // // 自动同步到后端 // syncEntity(original); // return result; // } // return method.invoke(original, args); // } // ); } // 以下是List接口的实现 @Override public int size() { return list.size(); } @Override public boolean isEmpty() { return list.isEmpty(); } @Override public boolean contains(Object o) { return list.contains(o); } @NonNull @Override public Iterator<T> iterator() { return list.iterator(); } @NonNull @Override public Object[] toArray() { return list.toArray(); } @NonNull @Override public <T1> T1[] toArray(@NonNull T1[] a) { return list.toArray(a); } @Override public boolean add(T t) { T proxy = createProxy(t); boolean result = list.add(proxy); if (!batchMode) { syncEntity(proxy); } return result; // 添加时创建代理 } @Override public boolean remove(Object o) { T entity = safeCast(o); if (entity != null) { syncEntity((T) entity); // 删除前同步 } return list.remove(o); } @Override public boolean containsAll(@NonNull Collection<?> c) { return list.containsAll(c); } @Override public boolean addAll(@NonNull Collection<? extends T> c) { boolean modified = false; for (T t : c) { modified |= add(t); } return modified; } @Override public boolean addAll(int index, @NonNull Collection<? extends T> c) { for (T t : c) { add(index++, t); } return true; } @Override public boolean removeAll(@NonNull Collection<?> c) { for (Object o : c) { T entity = safeCast(o); if (entity != null) { syncEntity(entity); } } return list.removeAll(c); } @Override public boolean retainAll(@NonNull Collection<?> c) { List<T> toRemove = new ArrayList<>(); for (T t : list) { if (!c.contains(t)) { toRemove.add(t); } } // 使用安全转换 for (T entity : toRemove) { syncEntity(entity); } return list.retainAll(c); } @Override public void clear() { for (T t : list) { syncEntity(t); // 清空前同步 } list.clear(); } @Override public T get(int index) { return list.get(index); } @Override public T set(int index, T element) { T old = list.set(index, createProxy(element)); if (old != null) { syncEntity(old); // 替换旧元素前同步 } return old; } @Override public void add(int index, T element) { list.add(index, createProxy(element)); } @Override public T remove(int index) { T removed = list.remove(index); if (removed != null) { syncEntity(removed); // 删除前同步 } return removed; } @Override public int indexOf(Object o) { return list.indexOf(o); } @Override public int lastIndexOf(Object o) { return list.lastIndexOf(o); } @NonNull @Override public ListIterator<T> listIterator() { return list.listIterator(); } @NonNull @Override public ListIterator<T> listIterator(int index) { return list.listIterator(index); } @NonNull @Override public List<T> subList(int fromIndex, int toIndex) { return list.subList(fromIndex, toIndex); } // 触发属性变更通知 // 添加类型安全的属性监听 private void firePropertyChange(T entity, String propertyName, Object oldValue, Object newValue) { if (oldValue != null && newValue != null && oldValue.equals(newValue)) { return; // 值未变化时不触发监听 } for (PropertyChangeListener<T> listener : listeners) { try { listener.onPropertyChange(entity, propertyName, oldValue, newValue); } catch (Exception e) { Log.e("SynchronizedList", "Listener error", e); } } } // 修改代理处理器以支持获取原始对象 /* 完整的 EntityProxyHandler 实现 */ private class EntityProxyHandler implements IProxyHandler, java.lang.reflect.InvocationHandler { private final T original; private final Map<String, Object> propertyValues = new HashMap<>(); public EntityProxyHandler(T original) { this.original = original; // 初始化属性缓存 for (Method method : original.getClass().getMethods()) { if (method.getName().startsWith("get") && method.getParameterCount() == 0) { try { String propName = method.getName().substring(3); propName = Character.toLowerCase(propName.charAt(0)) + propName.substring(1); propertyValues.put(propName, method.invoke(original)); } catch (Exception e) { Log.e("ProxyHandler", "Failed to cache property", e); } } } } @Override public T getOriginal() { return original; } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { String methodName = method.getName(); // 处理 setter 方法 if (methodName.startsWith("set") && args != null && args.length == 1) { String propertyName = methodName.substring(3); propertyName = Character.toLowerCase(propertyName.charAt(0)) + propertyName.substring(1); Object oldValue = propertyValues.get(propertyName); Object newValue = args[0]; // 调用原始方法 Object result = method.invoke(original, args); propertyValues.put(propertyName, newValue); // 触发监听 firePropertyChange(original, propertyName, oldValue, newValue); // 非批量模式下自动同步 if (!batchMode) { syncEntity(original); } return result; } // 特殊处理 getOriginal 方法 if ("getOriginal".equals(methodName)) { return original; } // 处理 getter 方法（使用缓存） if (methodName.startsWith("get") && method.getParameterCount() == 0) { String propertyName = methodName.substring(3); propertyName = Character.toLowerCase(propertyName.charAt(0)) + propertyName.substring(1); return propertyValues.getOrDefault(propertyName, method.invoke(original)); } return method.invoke(original, args); } private Object getPropertyValue(String propertyName) { String getterName = "get" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1); try { Method getter = original.getClass().getMethod(getterName); return getter.invoke(original); } catch (Exception e) { Log.e("ProxyHandler", "Failed to get property value: " + propertyName, e); return null; } } } // 在 SynchronizedList 类中添加 private interface IProxyHandler { Object getOriginal(); } } E FATAL EXCEPTION: main Process: com.example.kucun2, PID: 22195 java.lang.IllegalArgumentException: com.example.kucun2.entity.data.SynchronizableEntity is not an interface at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:635) at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:602) at java.lang.reflect.WeakCache$Factory.get(WeakCache.java:230) at java.lang.reflect.WeakCache.get(WeakCache.java:127) at java.lang.reflect.Proxy.getProxyClass0(Proxy.java:438) at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:873) at com.example.kucun2.entity.data.SynchronizedList.createProxy(SynchronizedList.java:186) at com.example.kucun2.entity.data.SynchronizedList.add(SynchronizedList.java:263) at com.example.kucun2.ui.jinhuo.AddInventoryFragment.createAndSaveDingdan(AddInventoryFragment.java:445) at com.example.kucun2.ui.jinhuo.AddInventoryFragment.lambda$showNewDingdanDialog$8(AddInventoryFragment.java:423) at com.example.kucun2.ui.jinhuo.AddInventoryFragment.$r8$lambda$viLBw5kNmkDSVG17JoXzuH5G85E(Unknown Source:0) at com.example.kucun2.ui.jinhuo.AddInventoryFragment$$ExternalSyntheticLambda20.onClick(D8$$SyntheticClass:0) at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:250) at android.os.Handler.dispatchMessage(Handler.java:109) at android.os.Looper.loopOnce(Looper.java:250) at android.os.Looper.loop(Looper.java:340) at android.app.ActivityThread.main(ActivityThread.java:9913) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:621) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:957)
06-10
<think>我们遇到了一个错误：`java.lang.IllegalArgumentException:com.example.kucun2.entity.data.SynchronizableEntityisnotaninterface`。这个错误发生在创建动态代理的时候。原因是在调用`Proxy....
2025-06-09 22:12:42.286 31140-31140 getEndpoint com.example.kucun2 D getEndpoint: url_add_Dingdan 2025-06-09 22:12:42.290 31140-31140 System.err com.example.kucun2 W R绫绘湭鎵惧埌: com.example.kucun2.R$String 2025-06-09 22:12:42.324 31140-31140 getEndpoint com.example.kucun2 D endpoint: nullpackage com.example.kucun2.entity.data; import android.util.Log; import com.example.kucun2.function.MyAppFnction; public abstract class SynchronizableEntity implements EntityClassGrassrootsid { /** * 添加url * @param type 操作增删改查 * @return 返回相对url */ public String getEndpoint(String type){ //从String.xml获取url Log.d("getEndpoint", "getEndpoint: "+"url_"+type+"_"+this.getClass().getSimpleName()); return MyAppFnction.getStringResource("String","url_"+type+"_"+this.getClass().getSimpleName()); } } package com.example.kucun2.entity.data; import android.util.Log; import androidx.annotation.NonNull; import com.google.gson.Gson; import java.io.IOException; import java.lang.reflect.Method; import java.lang.reflect.ParameterizedType; import java.lang.reflect.Proxy; import java.lang.reflect.Type; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.ListIterator; import java.util.Map; import java.util.Objects; import java.util.Set; import okhttp3.Call; import okhttp3.Callback; import okhttp3.MediaType; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.RequestBody; import okhttp3.Response; /** 支持数据变更自动同步的泛型集合类 @param <T> 继承自 SynchronizableEntity 的实体类型 */ public class SynchronizedList<T extends EntityClassGrassrootsid> implements List<T> { private final List<T> list = new ArrayList<>(); private final OkHttpClient client = new OkHttpClient(); private static final Gson gson = new Gson(); private static final MediaType JSON = MediaType.get(“application/json; charset=utf-8”); private final Class<T> entityClass; // 类型标记 // 添加批量操作模式标志 private boolean batchMode = false; // 属性变更监听器 private final List<PropertyChangeListener<T>> listeners = new ArrayList<>(); // 直接接受Class参数的构造函数 public SynchronizedList(Class<T> entityClass) { this.entityClass = entityClass; } // 安全的类型转换方法 private T safeCast(Object o) { if (o != null && entityClass.isInstance(o)) { return entityClass.cast(o); } return null; } public interface PropertyChangeListener<T> { void onPropertyChange(T entity, String propertyName, Object oldValue, Object newValue); } public void addPropertyChangeListener(PropertyChangeListener<T> listener) { listeners.add(listener); } public void removePropertyChangeListener(PropertyChangeListener<T> listener) { listeners.remove(listener); } // 添加方法来获取原始对象 @SuppressWarnings(“unchecked”) public T getOriginal(T proxy) { if (proxy == null) return null; // 检查是否为代理对象 if (java.lang.reflect.Proxy.isProxyClass(proxy.getClass())) { try { java.lang.reflect.InvocationHandler handler = java.lang.reflect.Proxy.getInvocationHandler(proxy); if (handler instanceof IProxyHandler) { Object original = ((IProxyHandler) handler).getOriginal(); // 安全类型检查 if (entityClass.isInstance(original)) { return (T) original; } } } catch (Exception e) { Log.e("SynchronizedList", "Failed to get proxy handler", e); } } return proxy; } /** 同步实体到后端 @param entity 要同步的实体 */ private void syncEntity(T entity) { if (batchMode) return; String operation = “add”; T originalEntity = getOriginal(entity); String endpoint = originalEntity.getEndpoint(operation); String json = gson.toJson(originalEntity); Log.d(“getEndpoint”, "endpoint: "+endpoint); RequestBody body = RequestBody.create(json, JSON); Request request = new Request.Builder() .url(endpoint) .method(getHttpMethod(operation), body) .build(); client.newCall(request).enqueue(new Callback() { @Override public void onFailure(@NonNull Call call, @NonNull IOException e) { Log.e(“SynchronizedList”, "同步失败: " + entity.getClass().getSimpleName(), e); } @Override public void onResponse(@NonNull Call call, @NonNull Response response) { if (!response.isSuccessful()) { Log.e("SynchronizedList", "同步失败: " + response.code() + " - " + response.message()); } response.close(); } }); } // 添加用于批量操作的方法 public void beginBatch() { this.batchMode = true; } public void endBatch() { this.batchMode = false; // 批量结束后触发一次全量同步 syncAllEntities(); } private void syncAllEntities() { for (T entity : list) { syncEntity(entity); } } private String getHttpMethod(String operation) { switch (operation) { case “add”: return “POST”; case “update”: return “PUT”; case “delete”: return “DELETE”; default: return “POST”; } } // 获取类实现的所有接口（包括父类接口） private Class<?>[] getInterfaces(Class<?> clazz) { Set<Class<?>> interfaces = new HashSet<>(); while (clazz != null) { interfaces.addAll(Arrays.asList(clazz.getInterfaces())); clazz = clazz.getSuperclass(); } return interfaces.toArray(new Class<?>[0]); } /** 创建代理对象，用于监听属性变更 */ // 优化 createProxy 方法 private T createProxy(T original) { if (original == null) return null; // 获取实体类实现的所有接口 Set<Class<?>> interfaces = new HashSet<>(); Class<?> clazz = original.getClass(); // 收集所有接口，包括继承链中的接口 while (clazz != null) { interfaces.addAll(Arrays.asList(clazz.getInterfaces())); clazz = clazz.getSuperclass(); } // 创建代理对象 return (T) Proxy.newProxyInstance( original.getClass().getClassLoader(), interfaces.toArray(new Class<?>[0]), new EntityProxyHandler(original) ); // if (!entityClass.isInstance(original)) { // throw new IllegalArgumentException(“Invalid entity type”); // } // // 这里使用动态代理模式监听setter方法调用 // return (T) java.lang.reflect.Proxy.newProxyInstance( // original.getClass().getClassLoader(), // original.getClass().getInterfaces(), // (proxy, method, args) -> { // // 只拦截setter方法 // if (method.getName().startsWith(“set”) && args.length == 1) { // String propertyName = method.getName().substring(3); // propertyName = propertyName.substring(0, 1).toLowerCase() + propertyName.substring(1); // // // 获取旧值 // Object oldValue = original.getClass() // .getMethod(“get” + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1)) // .invoke(original); // // // 调用原始方法 // Object result = method.invoke(original, args); // // // 触发监听器 // for (PropertyChangeListener<T> listener : listeners) { // listener.onPropertyChange(original, propertyName, oldValue, args[0]); // } // // // 自动同步到后端 // syncEntity(original); // return result; // } // return method.invoke(original, args); // } // ); } // 以下是List接口的实现 @Override public int size() { return list.size(); } @Override public boolean isEmpty() { return list.isEmpty(); } @Override public boolean contains(Object o) { return list.contains(o); } @NonNull @Override public Iterator<T> iterator() { return list.iterator(); } @NonNull @Override public Object[] toArray() { return list.toArray(); } @NonNull @Override public <T1> T1[] toArray(@NonNull T1[] a) { return list.toArray(a); } @Override public boolean add(T t) { T proxy = createProxy(t); boolean result = list.add(proxy); if (!batchMode) { syncEntity(proxy); } return result; // 添加时创建代理 } @Override public boolean remove(Object o) { T entity = safeCast(o); if (entity != null) { syncEntity((T) entity); // 删除前同步 } return list.remove(o); } @Override public boolean containsAll(@NonNull Collection<?> c) { return list.containsAll(c); } @Override public boolean addAll(@NonNull Collection<? extends T> c) { boolean modified = false; for (T t : c) { modified |= add(t); } return modified; } @Override public boolean addAll(int index, @NonNull Collection<? extends T> c) { for (T t : c) { add(index++, t); } return true; } @Override public boolean removeAll(@NonNull Collection<?> c) { for (Object o : c) { T entity = safeCast(o); if (entity != null) { syncEntity(entity); } } return list.removeAll(c); } @Override public boolean retainAll(@NonNull Collection<?> c) { List<T> toRemove = new ArrayList<>(); for (T t : list) { if (!c.contains(t)) { toRemove.add(t); } } // 使用安全转换 for (T entity : toRemove) { syncEntity(entity); } return list.retainAll(c); } @Override public void clear() { for (T t : list) { syncEntity(t); // 清空前同步 } list.clear(); } @Override public T get(int index) { return list.get(index); } @Override public T set(int index, T element) { T old = list.set(index, createProxy(element)); if (old != null) { syncEntity(old); // 替换旧元素前同步 } return old; } @Override public void add(int index, T element) { list.add(index, createProxy(element)); } @Override public T remove(int index) { T removed = list.remove(index); if (removed != null) { syncEntity(removed); // 删除前同步 } return removed; } @Override public int indexOf(Object o) { return list.indexOf(o); } @Override public int lastIndexOf(Object o) { return list.lastIndexOf(o); } @NonNull @Override public ListIterator<T> listIterator() { return list.listIterator(); } @NonNull @Override public ListIterator<T> listIterator(int index) { return list.listIterator(index); } @NonNull @Override public List<T> subList(int fromIndex, int toIndex) { return list.subList(fromIndex, toIndex); } // 触发属性变更通知 // 添加类型安全的属性监听 private void firePropertyChange(T entity, String propertyName, Object oldValue, Object newValue) { if (oldValue != null && newValue != null && oldValue.equals(newValue)) { return; // 值未变化时不触发监听 } for (PropertyChangeListener<T> listener : listeners) { try { listener.onPropertyChange(entity, propertyName, oldValue, newValue); } catch (Exception e) { Log.e("SynchronizedList", "Listener error", e); } } } // 修改代理处理器以支持获取原始对象 /* 完整的 EntityProxyHandler 实现 */ private class EntityProxyHandler implements IProxyHandler, java.lang.reflect.InvocationHandler { private final T original; private final Map<String, Object> propertyValues = new HashMap<>(); public EntityProxyHandler(T original) { this.original = original; cachePropertyValues(); } private void cachePropertyValues() { // 获取类信息 Class<?> clazz = original.getClass(); // 遍历所有getter方法 for (Method method : clazz.getMethods()) { String methodName = method.getName(); // 只处理getter方法 if (methodName.startsWith("get") && !methodName.equals("getClass") && method.getParameterTypes().length == 0) { try { // 获取属性名（去掉"get"并将首字母小写） String propertyName = methodName.substring(3); propertyName = Character.toLowerCase(propertyName.charAt(0)) + propertyName.substring(1); // 调用getter获取值 Object value = method.invoke(original); propertyValues.put(propertyName, value); } catch (Exception e) { Log.e("Wrapper", "Failed to cache property " + methodName, e); } } } } @Override public T getOriginal() { return original; } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { String methodName = method.getName(); // 只拦截setter方法 if (methodName.startsWith("set") && args != null && args.length == 1) { String propertyName = methodName.substring(3); propertyName = Character.toLowerCase(propertyName.charAt(0)) + propertyName.substring(1); Object oldValue = propertyValues.get(propertyName); Object newValue = args[0]; // 如果值未改变，不触发同步 if (Objects.equals(oldValue, newValue)) { return null; } // 调用原始对象的setter方法 Method setter = original.getClass().getMethod(methodName, newValue.getClass()); setter.invoke(original, newValue); // 更新属性缓存 propertyValues.put(propertyName, newValue); // 触发属性变更监听 firePropertyChange(original, propertyName, oldValue, newValue); // 非批量模式下自动同步 if (!batchMode) { syncEntity(original); } } // 其他接口方法直接调用原始对象 return method.invoke(original, args); } private Object getPropertyValue(String propertyName) { String getterName = "get" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1); try { Method getter = original.getClass().getMethod(getterName); return getter.invoke(original); } catch (Exception e) { Log.e("ProxyHandler", "Failed to get property value: " + propertyName, e); return null; } } } // 在 SynchronizedList 类中添加 private interface IProxyHandler { Object getOriginal(); } }package com.example.kucun2.entity.data; import android.content.Context; import android.util.Log; import androidx.annotation.NonNull; import com.example.kucun2.entity.; import com.example.kucun2.entity.data.SynchronizableEntity; import com.example.kucun2.entity.data.SynchronizedList; import com.google.gson.Gson; import com.google.gson.reflect.TypeToken; import okhttp3.; import org.json.JSONObject; import java.io.IOException; import java.lang.reflect.Type; import java.util.HashMap; import java.util.Map; import java.util.concurrent.TimeUnit; public class AppDataManager { private final Context context; private final OkHttpClient httpClient; private final Gson gson; private Map<String, SynchronizedList<? extends SynchronizableEntity>> dataCache; private static final String BASE_URL = “https://tian.sef/Kucun2”; private static final String API_ALL = “/app/all”; public AppDataManager(Context context) { this.context = context; this.gson = new Gson(); this.dataCache = new HashMap<>(); this.httpClient = new OkHttpClient.Builder() .connectTimeout(15, TimeUnit.SECONDS) .readTimeout(30, TimeUnit.SECONDS) .build(); } /** * 从服务器加载完整数据集 */ public void loadFullDataset(DataCallback callback) { Request request = new Request.Builder() .url(BASE_URL + API_ALL) .build(); httpClient.newCall(request).enqueue(new Callback() { @Override public void onFailure(@NonNull Call call, @NonNull IOException e) { Log.e("AppDataManager", "Failed to load full dataset", e); callback.onFailure("Network error: " + e.getMessage()); } @Override public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException { if (!response.isSuccessful()) { callback.onFailure("HTTP error: " + response.code()); return; } try { String jsonData = response.body().string(); JSONObject jsonObject = new JSONObject(jsonData); JSONObject data = jsonObject.getJSONObject("data"); // 解析各实体列表 parseEntityList(data, "bancais", Bancai.class); parseEntityList(data, "dingdans", Dingdan.class); parseEntityList(data, "mupis", Mupi.class); parseEntityList(data, "chanpins", Chanpin.class); parseEntityList(data, "kucuns", Kucun.class); parseEntityList(data, "chanpin_zujians", Chanpin_Zujian.class); parseEntityList(data, "zujians", Zujian.class); parseEntityList(data, "caizhis", Caizhi.class); parseEntityList(data, "users", User.class); callback.onSuccess(); } catch (Exception e) { Log.e("AppDataManager", "Error parsing response", e); callback.onFailure("Parsing error: " + e.getMessage()); } } }); } /** * 解析实体列表 */ private <T extends SynchronizableEntity> void parseEntityList(JSONObject data, String key, Class<T> clazz) { try { Type listType = TypeToken.getParameterized(SynchronizedList.class, clazz).getType(); SynchronizedList<T> list = gson.fromJson(data.getString(key), listType); dataCache.put(key, list); } catch (Exception e) { Log.e("AppDataManager", "Failed to parse " + key, e); } } /** * 添加实体到特定集合 */ public <T extends SynchronizableEntity> void addEntity(T entity, Class<T> clazz, DataCallback callback) { String endpoint = BASE_URL + getAddEndpointForClass(clazz); RequestBody body = RequestBody.create( gson.toJson(entity), MediaType.parse("application/json") ); Request request = new Request.Builder() .url(endpoint) .post(body) .build(); httpClient.newCall(request).enqueue(new Callback() { @Override public void onFailure(@NonNull Call call, @NonNull IOException e) { Log.e("AppDataManager", "Add entity failed", e); callback.onFailure("Network error: " + e.getMessage()); } @Override public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException { if (response.isSuccessful()) { try { T newEntity = gson.fromJson(response.body().string(), clazz); SynchronizedList<T> list = (SynchronizedList<T>) dataCache.get(getCacheKeyForClass(clazz)); if (list != null) { list.add(newEntity); } callback.onSuccess(); } catch (Exception e) { callback.onFailure("Parsing error: " + e.getMessage()); } } else { callback.onFailure("API error: " + response.code()); } } }); } /** * 获取添加操作的API端点 */ private <T> String getAddEndpointForClass(Class<T> clazz) { // 基于简单的命名约定生成端点 String className = clazz.getSimpleName().toLowerCase(); return "/app/" + className + "/add"; } /** * 获取缓存键名 */ private <T> String getCacheKeyForClass(Class<T> clazz) { return clazz.getSimpleName().toLowerCase() + "s"; } /** * 从缓存获取实体列表 */ @SuppressWarnings("unchecked") public <T extends SynchronizableEntity> SynchronizedList<T> getEntityList(Class<T> clazz) { String key = getCacheKeyForClass(clazz); return (SynchronizedList<T>) dataCache.get(key); } /** * 类型安全的实体更新方法 * @param entity 要更新的实体 * @param callback 操作回调 */ @SuppressWarnings("unchecked") public <T extends SynchronizableEntity> void updateEntity(T entity, DataCallback callback) { // 使用实体类的实际类型 Class<T> entityClass = (Class<T>) entity.getClass(); updateEntity(entity, entityClass, callback); } /** * 更新实体 */ public <T extends SynchronizableEntity> void updateEntity(T entity, Class<T> clazz, DataCallback callback) { String endpoint = BASE_URL + getUpdateEndpointForClass(clazz); RequestBody body = RequestBody.create( gson.toJson(entity), MediaType.parse("application/json") ); Request request = new Request.Builder() .url(endpoint) .put(body) .build(); httpClient.newCall(request).enqueue(new Callback() { @Override public void onFailure(@NonNull Call call, @NonNull IOException e) { callback.onFailure("Network error: " + e.getMessage()); } @Override public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException { if (response.isSuccessful()) { callback.onSuccess(); } else { callback.onFailure("API error: " + response.code()); } } }); } /** * 获取更新操作的API端点 */ private <T> String getUpdateEndpointForClass(Class<T> clazz) { // 基于简单命名约定生成端点 String className = clazz.getSimpleName().toLowerCase(); return "/app/" + className + "/update"; } /** * 获取用户认证令牌 */ public void authenticateUser(String username, String password, AuthCallback callback) { JSONObject authJson = new JSONObject(); try { authJson.put("username", username); authJson.put("password", password); } catch (Exception e) { callback.onFailure("Auth parameter error"); return; } RequestBody body = RequestBody.create( authJson.toString(), MediaType.parse("application/json") ); Request request = new Request.Builder() .url(BASE_URL + "/user/login") .post(body) .build(); httpClient.newCall(request).enqueue(new Callback() { @Override public void onFailure(@NonNull Call call, @NonNull IOException e) { callback.onFailure("Network error: " + e.getMessage()); } @Override public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException { if (response.isSuccessful()) { try { JSONObject authResponse = new JSONObject(response.body().string()); String token = authResponse.getString("token"); callback.onSuccess(token); } catch (Exception e) { callback.onFailure("Token parsing error"); } } else { callback.onFailure("Authentication failed"); } } }); } /** * 数据加载回调接口 */ public interface DataCallback { void onSuccess(); void onFailure(String error); } /** * 认证回调接口 */ public interface AuthCallback { void onSuccess(String token); void onFailure(String error); } } E FATAL EXCEPTION: main Process: com.example.kucun2, PID: 31140 java.lang.NullPointerException: Parameter specified as non-null is null: method okhttp3.Request$Builder.url, parameter url at okhttp3.Request$Builder.url(Unknown Source:2) at com.example.kucun2.entity.data.SynchronizedList.syncEntity(SynchronizedList.java:114) at com.example.kucun2.entity.data.SynchronizedList.add(SynchronizedList.java:272) at com.example.kucun2.ui.jinhuo.AddInventoryFragment.createAndSaveDingdan(AddInventoryFragment.java:445) at com.example.kucun2.ui.jinhuo.AddInventoryFragment.lambda$showNewDingdanDialog$8(AddInventoryFragment.java:423) at com.example.kucun2.ui.jinhuo.AddInventoryFragment.$r8$lambda$viLBw5kNmkDSVG17JoXzuH5G85E(Unknown Source:0) at com.example.kucun2.ui.jinhuo.AddInventoryFragment$$ExternalSyntheticLambda20.onClick(D8$$SyntheticClass:0) at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:250) at android.os.Handler.dispatchMessage(Handler.java:109) at android.os.Looper.loopOnce(Looper.java:250) at android.os.Looper.loop(Looper.java:340)
06-10
public static Map<String, String> URL_MAP = new HashMap<>(); @Override public void onCreate() { super.onCreate(); URL_MAP.put("add_Dingdan", getString(R.string.url_add_Dingdan)); // 加载其他...
将Object转换成List
热门推荐
ptsx0607的专栏
08-27 17万+
java中如果需要将一个object转成list,大部分人会直接使用强制类型转换：(List<String>) obj这样。这样强制转换编译会提示Unchecked cast: 'java.lang.Object' to 'java.util.List<java.lang.String>'，编译器的意思该强制类型转换并未做类型校验，强制转换并不安全，可能会抛出异常导致程序崩...
idea警告：Unchecked cast: ‘java.lang.Object‘ to ‘java.util.List
二十一克阳光！的博客
07-03 6193
出现原因，实际应用时map集合中存在多个键值对，而由于每个键对应的值为不同类型，当存在一个值的类型为List时，在接收时做强制转换会出现此警告。 为了防止这个问题可以在方法上添加 @SuppressWarnings(“unchecked”)来消除警告，但是这只是忽略了问题，其实问题依然存在，彻底解决的方式是使用jackson来类型转换： List<Integer> integerList= new ObjectMapper().convertValue(map.get("roleIdList")
AsyncTask报错：ClassCastException: java.lang.Object[] cannot be cast to java.lang.String[]
yzpbright的博客
04-21 1155
... java.lang.RuntimeException: An error occurred while executing doInBackground() at android.os.AsyncTask$4.done(AsyncTask.java:415) at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383) at java.util.concurr
Java下正面解除警告Unchecked cast: ‘java.lang.Object‘ to ‘java.util.ArrayList‘
Zwarwolf的专栏
10-02 1251
Java下解除警告Unchecked cast: 'java.lang.Object' to 'java.util.ArrayList'
[Ljava.lang.Object; cannot be cast to [Ljava.lang.String;报错解决方法
ljasdf123的专栏
08-25 6155
传参数的时候定义传的是String[ ] 所以执行这句话： (String[ ])(emails.toArray()） 在执行这个的时候报错： [Ljava.lang.Object; cannot be cast to [Ljava.lang.String 在视图将某个Object转换为String类型时报错； 在java的api中有两种方法： 1.不带参数的toA
评论
添加红包

请填写红包祝福语或标题

个

红包个数最小为10个

元

红包金额最低5元

当前余额3.43元 前往充值 >
需支付：10.00元
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包

打赏作者

i进击的攻城狮

你的鼓励将是我创作的最大动力

¥1 ¥2 ¥4 ¥6 ¥10 ¥20
扫码支付：¥1
获取中
扫码支付

您的余额不足，请更换扫码支付或充值

打赏作者

实付元
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明：

1.余额是钱包充值的虚拟货币，按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载，可以购买VIP、付费专栏及课程。

余额充值