1>java对象转json ，使用JSONArray
1 UserInfo user = new UserInfo(1001,"张三"); 2 JSONArray jsonArray = JSONArray.fromObject(user); 3 System.out.println( jsonArray );
2>Map转换成json， 使用JSONObject
1 Map<String, Object> map = new HashMap<String, Object>(); 2 map.put("userId", 1001); 3 map.put("userName", "张三"); 4 map.put("userSex", "男"); 5 JSONObject jsonObject = JSONObject.fromObject(map); 6 System.out.println(jsonObject);
3>List转换成JSON数据,使用JSONArray
1 List<UserInfo> list = new ArrayList<UserInfo>(); 2 UserInfo user = new UserInfo(1001, "张三"); 3 list.add(user); 4 list.add(user); 5 list.add(user); 6 JSONArray jsonArray = JSONArray.fromObject(list); 7 System.out.println(jsonArray);
4>将数组转换为JSON，使用JSONArray
1 String[] arr = {"asd","dfgd","asd","234"}; 2 JSONArray jsonarray = JSONArray.fromObject(arr); 3 System.out.println(jsonarray);
注：Object转jsonString
1 public static String convertObjectToJson(Object obj) { 2 String json = JSONArray.toJSONString(obj); 3 return json; 4 }
