Java USES a JSONObject instance

First, introduce jar package
To use JSONObject, you must reference json-lib.jar, which also depends on other packages
Common - lang. Jar
Common - beanuitls. Jar
Common - collections. The jar
Common - logging. The jar
Ezmorph. Jar
Use of JSONObject
The json-lib package is a package that converts Java objects, XML, and JSON to each other.
1. Convert Java objects to json strings

Person p1=new Person();
p1.setName(" ." ");
p1.setAge(26);
String jsonStr=JSONObject.fromObject(p1).toString();

2. Convert a Java collection to a json string

        Person p1=new Person();p1.setName("A1");p1.setAge(26);
        Person p2=new Person();p2.setName("A2");p2.setAge(23);

        List personList=new ArrayList<Person>();
        personList.add(p1);
        personList.add(p2);

        Map personMap=new HashMap<String, Person>();
        personMap.put("p1", p1);
        personMap.put("p2", p2);

        //[{"age":26,"name":"A1"},{"age":23,"name":"A2"}]
        JSONArray.fromObject(personList).toString();
 JSONSerializer.toJSON(personList)

        //[{"p2":{"name":"A2","age":23},"p1":{"name":"A1","age":26}}]
        JSONArray.fromObject(personMap).toString();
 JSONSerializer.toJSON(personMap)

3. Convert json strings into dynamic Java objects

 String jsonStr="[{"name":"A2","age":23},{"name":"A1","age":26}]";
        JSONArray ja=JSONArray.fromObject(jsonStr);

        for(int i=0;i<ja.size();i++){
            JSONObject jo= ja.getJSONObject(i); //Convert to a JSONObject
            System.out.println(jo.get("name"));

            Person p=(Person)JSONObject.toBean(jo,Person.class);    //Convert javabeans
            System.out.println(p.getName()); 

        }