JAVA中json字符串如何转化为map对象获取数据?
我们需要先把json字符串转化为net.sf.json.JSONObject对象,java中这样就可以完成json字符串到Map的转换了。
1.将数组转换为JSON:String[] arr = {"asd"清则核,"dfgd","asd","234"};JSONArray jsonarray = JSONArray.fromObject(arr);System.out.println(jsonarray);
2.对象转换成JSON:UserInfo user = new UserInfo(1001,"张盯裤三");JSONArray jsonArray = JSONArray.fromObject(user);System.out.println( jsonArray );
3.把Map转换成json, 要使用jsonObject对象:Map<String, Object> map = new HashMap<String, Object>();map.put("userId", 1001);map.put("userName", "张三");map.put("userSex", "答掘男");JSONObject jsonObject = JSONObject.fromObject(map);System.out.println(jsonObject);
4.把List转换成JSON数据:List<UserInfo> list = new ArrayList<UserInfo>();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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