java中将数组、对象、Map、List转换成JSON数据

如果要将数组、对象、Map、List转换成JSON数据,那我们需要一些jar包:

json-lib-2.4-jdk15.jar

ezmorph-1.0.6.jar

commons-logging.jar

commons-lang.jar

commons-collections.jar

commons-beanutils.jar

 

将数组转换为JSON:

String[] arr = {"asd","dfgd","asd","234"};

JSONArray jsonarray = JSONArray.fromObject(arr);

System.out.println(jsonarray);

对象转换成JSON:

UserInfo user = new UserInfo(1001,"张三");

JSONArray jsonArray = JSONArray.fromObject(user);  

System.out.println( jsonArray ); 

把Map转换成json, 要使用jsonObject对象:

 

Map map = new HashMap();

map.put("userId", 1001);

map.put("userName", "张三");

map.put("userSex", "男");

JSONObject jsonObject = JSONObject.fromObject(map);

System.out.println(jsonObject);

把List转换成JSON数据:

 

List list = new ArrayList();

UserInfo user = new UserInfo(1001, "张三");

list.add(user);

list.add(user);

list.add(user);

JSONArray jsonArray = JSONArray.fromObject(list);

System.out.println(jsonArray);

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