JSON

        Student2 stu = new Student2(1, "张三", 20);

        // 生成json字符串。
        JSONObject obj = new JSONObject(stu);
        System.out.println(obj.toString());

        List<Student2> list = new ArrayList<Student2>();
        for(int i=0;i<5;i++){
            Student2 stu = new Student2(i,"aa"+i,20+i);
            list.add(stu);
        }
        //创建json字符串。
        JSONArray array = new JSONArray(list);
        System.out.println(array.toString());

    // 1:{"id":1,"age":20,"name":"张三"}
    public static String fun1(){
        Student stu = new Student(1,"zhangsan",20);
        JSONObject obj = new JSONObject(stu);
        return obj.toString();
    }
    
    // 2:{"student":{"id":1,"age":20,"name":"张三"}}
    public static String fun2(){
        Student stu = new Student(1,"zhangsan",20);
        JSONObject obj = new JSONObject(stu);
        JSONObject obj2 = new JSONObject();
        try {
            obj2.put("student", obj);
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return obj2.toString();
    }

    // 3:{"student":{"id":1,"age":20,"name":"张三"},"class_name":"and1510"}
    public static String fun3(){
        Student stu = new Student(1,"zhangsan",20);
        MyClass myclass = new MyClass(stu,"and1510");
        JSONObject obj = new JSONObject(myclass);
        return obj.toString();
    }
    
    //4 {"list":[{"id":1,"age":20,"name":"张三"},
    //{"id":2,"age":30,"name":"张三"}],"class_name":"and1510"}
    public static String fun4(){
        Student stu1 = new Student(1,"zhangsan",20);
        Student stu2 = new Student(2,"lisi",21);
        List<Student> stulist = new ArrayList<Student>();
        stulist.add(stu1);
        stulist.add(stu2);
        MyClass2 myclass = new MyClass2("and1510", stulist);
        JSONObject obj1 = new JSONObject(myclass);
        return obj1.toString();
    }
    
    
     /*[{"id":1,"age":20,"name":"张三"},{"id":2,"age":30,"name"
         * :"张三"}]*/
    public static String fun5(){
        Student stu1 = new Student(1,"zhangsan",20);
        Student stu2 = new Student(2,"lisi",21);
        List<Student> stulist = new ArrayList<Student>();
        stulist.add(stu1);
        stulist.add(stu2);
        JSONArray array = new JSONArray(stulist);
        return array.toString();
        
    }
    
    /*{"myclass":{"list":[{"id":1,"age":20,"name":"张三"},{"id":2,"age":30,"name"
         * :"张三"}],"class_name":"and1510"}}*/
    public static String fun6(){
        Student stu1 = new Student(1,"zhangsan",20);
        Student stu2 = new Student(2,"lisi",21);
        List<Student> stulist = new ArrayList<Student>();
        stulist.add(stu1);
        stulist.add(stu2);
        MyClass2 myclass = new MyClass2("and1510", stulist);
        JSONObject obj1 = new JSONObject(myclass);
        JSONObject obj2 = new JSONObject();
        try {
            obj2.put("myclss", obj1);
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return obj2.toString();
    }

        //{"student":{"id":1,"age":20,"name":"张三"}}
        String json = JSONService.createJSON_02();
        System.out.println(json);
        Student stu = new Student();
        JSONObject obj = new JSONObject(json);
        //通过键student获得JSONObject对象
        JSONObject obj2 = obj.getJSONObject("student");
        //再从JSONObject对象中获得指定值所对应的值。并赋给Student
        stu.setName(obj2.getString("name"));
        stu.setAge(obj2.getInt("age"));
        stu.setId(obj2.getInt("id"));
        System.out.println(stu);