fastjson converts Map objects and strings

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Reprinted: https://blog.csdn.net/xlecho/article/details/81131561

Convert object to string

HashMap<String,Object> map=new HashMap<>(2);
map.put("studentNo","123");
map.put("subjectNo","321");
String strInfo = JSON.toJSONString(map);

Convert string to object

JSONObject map = JSON.parseObject(strInfoDo);

String studentNo=(String)map.get("studentNo")
String subjectNo=(String)map.get("subjectNo")

Convert a collection of objects into a string

String xmlStr= JSON.toJSONString(list);

--下面的方法比上面会快。快更多，非常多
(hutool.json)
JSONArray jsonArray=new JSONArray(list);
String xmlStr=jsonArray.toString();

Convert a string into a collection of objects

List<User> userList = JSON.parseArray(userStr, User.class);