net.sf.json.JSONObject对象

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 bean与json互转

    public static void main(String[] args) {
        //定义对象
        Student stu = new Student("张三", "123456");
        //JavaBean对象转json字符串
        JSONObject jsonObject = JSONObject.fromObject(stu);
        System.out.println(jsonObject);

        //json字符串转为javaBean
        //定义json字符串
        String jsondata = "{\"username\":\"李四\", \"password\":\"123\"}";
        //转为json对象
        JSONObject json = JSONObject.fromObject(jsondata);

        //转为JavaBean对象,强转
        Student stu2 = (Student)JSONObject.toBean(json, Student.class);
        System.out.println(stu2.toString());
    }

 

 //list与json互转

    public static void main(String[] args) {
        //定义list集合
        List list = new ArrayList();
        list.add(new Student("张三", "123"));
        list.add(new Student("李四", "456"));
        //list转json字符串
        JSONArray jsonArray = JSONArray.fromObject(list);
        System.out.println(jsonArray);

        //json字符串转list
        List list2 = new ArrayList();
        String jsondata = "[{\"password\":\"123\",\"username\":\"张三\"},{\"password\":\"456\",\"username\":\"李四\"}]";
        JSONArray jsonArray1 = JSONArray.fromObject(jsondata);
        for(int i = 0; i < jsonArray1.size(); i++) {
            JSONObject jsonObject2 = jsonArray1.getJSONObject(i);
            Student stu2 = (Student)JSONObject.toBean(jsonObject2, Student.class);
            list2.add(stu2);
        }
        System.out.println(list2);
    } 

 

//map与json互转

public static void main(String[] args) {
        //定义map集合
        Map map = new HashMap();
        map.put("1", new Student("张三", "123"));
        map.put("2", new Student("李四", "456"));
        //Map转json字符串
        JSONObject jsonMap = JSONObject.fromObject(map);
        System.out.println(jsonMap);

        //定义字符串map集合
        String jsondata = "{\"1\":{\"password\":\"123\",\"username\":\"张三\"},\"2\":{\"password\":\"456\",\"username\":\"李四\"}}";
        //map集合字符串转为map
        Map map2 = (Map)JSONObject.fromObject(jsondata);
        Set set = map2.keySet();
        //定义迭代器，迭代输出
        Iterator ite = set.iterator();
        while(ite.hasNext()) {
            //取出一个字符串对象
            String key = (String)ite.next();
            //转为json格式
            JSONObject jsonObject = JSONObject.fromObject(map2.get(key));
            //转为对象
            Student stu = (Student)JSONObject.toBean(jsonObject, Student.class);
            System.out.println(key+"   "+stu);
        }
    } 

 

 

deepBean与json互转

  // deepBean与json互转
        String jsondata = "{\"student\":{\"username\":\"李四\", \"password\":\"123\"},\"count\":20,\"name\":\"这是我的班级名\"}";
        //转为json对象
        JSONObject json = JSONObject.fromObject(jsondata);
        System.out.println("json = " + json);
        //转为JavaBean对象,强转
        Grade grade = (Grade)JSONObject.toBean(json, Grade.class);

        //bean转json
        JSONObject grade11 = JSONObject.fromObject(grade);
        System.out.println(grade11);

 

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