项目地址:
Github:https://github.com/smileysx/GsonTest
Oschina:https://git.oschina.net/ysx_xx/GsonText
详解Gson使用(一)简单对象转化
http://blog.youkuaiyun.com/a249900679/article/details/51385913
详解Gson使用(二)带泛型的List转化
http://blog.youkuaiyun.com/a249900679/article/details/51386028
详解Gson使用(三)使用注解
http://blog.youkuaiyun.com/a249900679/article/details/51386509
详解Gson使用(四)Map对象转化
http://blog.youkuaiyun.com/a249900679/article/details/51386660
详解Gson使用(五)实现百度翻译功能
http://blog.youkuaiyun.com/a249900679/article/details/51386727
接下来介绍Map对象与json的相互转换
Map类型的转换就需要用到
GsonBuilder().enableComplexMapKeySerialization().create()类生成Gson对象
1. Map<String, String>类型的转换:
这里直接贴关键代码,其他代码可参考前两篇文章,或下载代码。
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private String seven() {
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Gson gson2 = new GsonBuilder().enableComplexMapKeySerialization().create();
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Map<String, String> map = new HashMap<String, String>();
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map.put("key1", "value1");
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map.put("key2", "value2");
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map.put("key3", "value3");
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return gson2.toJson(map);
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}
结果为:
把json数据转换为Map<String, String>:
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private String seven() {
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Gson gson2 = new GsonBuilder().enableComplexMapKeySerialization().create();
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Map<String, String> map = new HashMap<String, String>();
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map.put("key1", "value1");
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map.put("key2", "value2");
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map.put("key3", "value3");
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String jsonString = gson.toJson(map);
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Type type = new TypeToken<Map<String, String>>() {}.getType();
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Map<String, String> map2 = gson2.fromJson(jsonString, type);
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String showString = "";
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for (String keyString : map2.keySet()) {
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showString += keyString + ":" + map2.get(keyString) + "\n-----\n";
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}
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showString += "----------------------\n";
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return showString;
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}
结果为:
2. Map<Object, String>类型的转换:
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private String eight() {
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Gson gson2 = new GsonBuilder().enableComplexMapKeySerialization().create();
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Map<ToJsonBeanOne, String> map = new LinkedHashMap<ToJsonBeanOne, String>();
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map.put(new ToJsonBeanOne(1, "小熊1", 21), "value1");
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map.put(new ToJsonBeanOne(2, "小熊2", 21), "value2");
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map.put(new ToJsonBeanOne(3, "小熊3", 21), "value3");
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return gson2.toJson(map);
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}
结果为:
把json数据转换为Map<Object, String>:
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private String eight() {
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Gson gson2 = new GsonBuilder().enableComplexMapKeySerialization().create();
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Map<ToJsonBeanOne, String> map = new LinkedHashMap<ToJsonBeanOne, String>();
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map.put(new ToJsonBeanOne(1, "小熊1", 21), "value1");
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map.put(new ToJsonBeanOne(2, "小熊2", 21), "value2");
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map.put(new ToJsonBeanOne(3, "小熊3", 21), "value3");
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String jsonString = gson2.toJson(map);
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Type type = new TypeToken<Map<ToJsonBeanOne, String>>() {}.getType();
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Map<ToJsonBeanOne, String> map2 = gson.fromJson(jsonString, type);
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String showString = "";
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for (ToJsonBeanOne beanOne : map2.keySet()) {
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showString += "key:\n" + beanOne.toString() + "value:" + map2.get(beanOne) + "\n-----\n";
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}
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showString += "----------------------\n";
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return showString;
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}
结果为:
3. Map<String, Object>类型的转换:
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private String nine() {
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Gson gson2 = new GsonBuilder().enableComplexMapKeySerialization().create();
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Map<String, ToJsonBeanOne> map = new LinkedHashMap<String, ToJsonBeanOne>();
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map.put("key1", new ToJsonBeanOne(1, "小熊1", 21));
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map.put("key2", new ToJsonBeanOne(2, "小熊2", 21));
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map.put("key3", new ToJsonBeanOne(3, "小熊3", 21));
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return gson2.toJson(map);
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}
结果为:
把json数据转换为Map<String, Object>:
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private String nine() {
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Gson gson2 = new GsonBuilder().enableComplexMapKeySerialization().create();
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Map<String, ToJsonBeanOne> map = new LinkedHashMap<String, ToJsonBeanOne>();
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map.put("key1", new ToJsonBeanOne(1, "小熊1", 21));
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map.put("key2", new ToJsonBeanOne(2, "小熊2", 21));
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map.put("key3", new ToJsonBeanOne(3, "小熊3", 21));
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String jsonString = gson2.toJson(map);
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Type type = new TypeToken<Map<String, ToJsonBeanOne>>() {}.getType();
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Map<String, ToJsonBeanOne> map2 = gson.fromJson(jsonString, type);
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String showString = "";
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for (String keyString : map2.keySet()) {
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showString += "key:\n" + keyString + "\nvalue:\n" + map2.get(keyString).toString() + "-----\n";
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}
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showString += "----------------------\n";
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return showString;
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}
结果为: