JAVA 处理JSON工具类

本文介绍了一个用于处理JSON数据的Java工具类,包括将对象列表转换为JSON字符串,将JSON字符串转换为对象,以及从JSON字符串解码列表和对象的方法。
以下代码为Java处理json数据的工具类,以备后用

package com.json.utils;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class JsonUtils {

public static String encodeList(Object[] objs) {
return encodeList(Arrays.asList(objs));
}

@SuppressWarnings("unchecked")
public static String encodeList(Collection objs) {
JSONArray list = new JSONArray();
if (objs == null || objs.size() == 0)
return list.toString();
for (Object ae : objs) {
list.add(ae);
}
return list.toString();
}

@SuppressWarnings("unchecked")
public static String encodeObject(Object obj){
if(obj instanceof Collection)
return encodeList((Collection)obj);
JSONObject jo = JSONObject.fromObject(obj);
return jo.toString();
}

@SuppressWarnings("unchecked")
public static <T>List<T> decodeList(String str, Class<T> clazz) {
if (str == null || "".equals(str))
return null;
JSONArray obj = JSONArray.fromObject(str);
Object[] rts = obj.toArray();
List<T> result = new ArrayList<T>(rts.length);
for (int i = 0; i < rts.length; i++) {
Object jo = rts[i];
T ele = (T)JSONObject.toBean((JSONObject) jo, clazz);
result.add( ele );
}
return result;
}

@SuppressWarnings("unchecked")
public static <T>T decodeObject(String json,Class<T> clz){
JSONObject jsonObject = JSONObject.fromObject(json);
T bean = (T) JSONObject.toBean(jsonObject, clz);
return bean;
}
}
java解析json字符串。 commons-beanutils-1.9.0 commons-collections-3.2.1 commons-lang-2.6 commons-logging-1.1.3 ezmorph-1.0.6 json-lib-2.4-jdk15 demo: package com; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import net.sf.ezmorph.object.DateMorpher; import net.sf.json.JSONArray; import net.sf.json.JSONObject; import net.sf.json.JsonConfig; import net.sf.json.util.JSONUtils; public class Jsontest { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub JSONObject jsonObj = new JSONObject(); jsonObj.put("name", "hzj"); jsonObj.put("sex", "female"); System.out.println(jsonObj); } public static Object jsonToBean(String jsonString, Class cla) { JSONObject jsonObj = null; try { setDateFormat2Java(); jsonObj = JSONObject.fromObject(jsonString); } catch (Exception ex) { ex.printStackTrace(); } return JSONObject.toBean(jsonObj, cla); } public static Object jsonToBean(String jsonString, Class cla, Map map) { JSONObject jsonObj = null; try { setDateFormat2Java(); jsonObj = JSONObject.fromObject(jsonString); } catch (Exception ex) { ex.printStackTrace(); } return JSONObject.toBean(jsonObj, cla, map); } public static Object[] jsonToArray(String jsonString, Class cla) { Object[] arrObj = null; try { setDateFormat2Java(); JSONArray array = JSONArray.fromObject(jsonString); arrObj = new Object[array.size()]; for (int i = 0; i < array.size(); i++) { JSONObject jsonObject = array.getJSONObject(i); arrObj[i] = JSONObject.toBean(jsonObject, cla); } } catch (Exception ex) { ex.printStackTrace(); } return arrObj; } public static Object[] jsonToArray(String jsonString, Class cla, Map map) { Object[] arrObj = null; try { setDateFormat2Java(); JSONArray array = JSONArray.fromObject(jsonString); arrObj = new Object[array.size()]; for (int i = 0; i < array.size(); i++) { JSONObject jsonObject = array.getJSONObject(i); arrObj[i] = JSONObject.toBean(jsonObject, cla, map); } } catch (Exception ex) { ex.printStackTrace(); } return arrObj; } public static List jsonToList(String jsonString, Class cla) { List list = null; try { setDateFormat2Java(); JSONArray array = JSONArray.fromObject(jsonString); list = new ArrayList(); for (Iterator iter = array.iterator(); iter.hasNext();) { JSONObject jsonObject = (JSONObject) iter.next(); list.add(JSONObject.toBean(jsonObject, cla)); } } catch (Exception ex) { ex.printStackTrace(); } return list; } public static List jsonToList(String jsonString, Class cla, Map map) { List list = null; try { setDateFormat2Java(); JSONArray array = JSONArray.fromObject(jsonString); list = new ArrayList(); for (Iterator iter = array.iterator(); iter.hasNext();) { JSONObject jsonObject = (JSONObject) iter.next(); list.add(JSONObject.toBean(jsonObject, cla, map)); } } catch (Exception ex) { ex.printStackTrace(); } return list; } public static Map jsonToMap(String jsonString) { Map map = null; try { setDateFormat2Java(); JSONObject jsonObject = JSONObject.fromObject(jsonString); map = new HashMap(); for (Iterator iter = jsonObject.keys(); iter.hasNext();) { String key = (String) iter.next(); map.put(key, jsonObject.get(key)); } } catch (Exception ex) { ex.printStackTrace(); } return map; } public static Object[] jsonToArray(String jsonString) { JSONArray jsonArray = JSONArray.fromObject(jsonString); return jsonArray.toArray(); } public static void setDateFormat2Java() { JSONUtils.getMorpherRegistry().registerMorpher( new DateMorpher(new String[] { "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss" })); } }
处理嵌套json格式的数据。。。 public static void main(String[] args) { // 官方API http://www.json.org/java/ /* 购物车中信息 goods_cart={cart_1325036696007:{goods_id:"100015",goods_name:"澳大利亚进口绵羊",goods_imgsrc:"http://192.168.1.180:7001//gwadmin/uploadimg/spxc/2011/12/9/100016_00948703_68.jpg",specs:"b555bfj05d7dcg307h91323398584156",specsstr:"颜色:黑色 尺寸:L",price:4765,stock:15,count:6},cart_1325036702105:{goods_id:"100015",goods_name:"澳大利亚进口绵羊",goods_imgsrc:"http://192.168.1.180:7001//gwadmin/uploadimg/spxc/2011/12/9/100016_00948703_68.jpg",specs:"787a9f5he93chcifh951323398314484",specsstr:"颜色:黑色 尺寸:XL",price:4700.15,stock:12,count:1},cart_1325136643984:{goods_id:"100015",goods_name:"澳大利亚进口绵羊",goods_imgsrc:"http://192.168.1.180:7001//gwadmin/uploadimg/spxc/2011/12/9/100015_00399656_68.jpg",specs:"8466347bi6eia43hd6j1323398639859",specsstr:"颜色:灰色 尺寸:XL",price:4600,stock:3,count:1}}; * **/ try{ String s0 = "{cart_1325036696007:{goods_id:"100015",goods_name:"澳大利亚进口绵羊",goods_imgsrc:"http://192.168.1.180:7001//gwadmin/uploadimg/spxc/2011/12/9/100016_00948703_68.jpg",specs:"b555bfj05d7dcg307h91323398584156",specsstr:"颜色:黑色 尺寸:L",price:4765,stock:15,count:6},cart_1325036702105:{goods_id:"100015",goods_name:"澳大利亚进口绵羊",goods_imgsrc:"http://192.168.1.180:7001//gwadmin/uploadimg/spxc/2011/12/9/100016_00948703_68.jpg",specs:"787a9f5he93chcifh951323398314484",specsstr:"颜色:黑色 尺寸:XL",price:4700.15,stock:12,count:1},cart_1325136643984:{goods_id:"100015",goods_name:"澳大利亚进口绵羊",goods_imgsrc:"http://192.168.1.180:7001//gwadmin/uploadimg/spxc/2011/12/9/100015_00399656_68.jpg",specs:"8466347bi6eia43hd6j1323398639859",specsstr:"颜色:灰色 尺寸:XL",price:4600,stock:3,count:1}};"; String s= java.net.URLDecoder.decode(s0, "utf-8"); System.out.println(s); JSONObject o = new JSONObject(s); System.out.println(o.get("cart_1325036696007")); //根据属性,获取值 System.out.println(o.toString()); //得到字符串 System.out.println(o.names().get(2)); //获取对象中第三组属性名 System.out.println(o.names().length()); //获取对象中属性个数 //System.out.println(o.names().getJSONArray(1)); //获取对象中属性个数 //names(jsonObjectName) 私有方法 获取该对象的所有属性名,返回成JSONArray。 //JSONObject.getNames(jsonObjectName) 静态方法 获取对象的所有属性名,返回成数组。 System.out.println(JSONObject.getNames(o.getJSONObject("cart_1325036696007"))[1]); System.out.println(o.getJSONObject("cart_1325036696007").names().get(1)); System.out.println(o.length()); //共有几组对象 System.out.println(o.has("cart_1325036696007")); //有无该该值 /* 遍历json中的每一组元素*/ String name = null; JSONObject t_o = null; for(int i=0; i<o.length(); i++){ name = JSONObject.getNames(o)[i]; System.out.println("商品项ID:"+name); t_o = o.getJSONObject(name); for(int j=0; j< t_o.length(); j++){ name = JSONObject.getNames(t_o)[j]; System.out.print(name+":"+t_o.get(name)+" "); } System.out.println(); } }catch(Exception e){ e.printStackTrace(); } }
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