net.sf.json.JSONObject 类的日常使用，作者的jsonDemo

package com.ljj.test; import com.ljj.test.entity.Grade; import com.ljj.test.entity.Student; import net.sf.json.JSONArray; import net.sf.json.JSONObject; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Set; /** * @Author lijunyun * @Date 2022/11/21 16:57 */ public class TestMain { //测试json的添加属性，打印 public void jsonTest(){ //创建JSONObject JSONObject json = new JSONObject(); //添加属性 json.put("username", "张三"); json.put("password", "123"); //打印 System.out.println(json); //增加属性 json.element("sex", "男"); json.put("age", 18); System.out.println(json); //根据key返回输出 System.out.println(json.get("sex")); } // bean与json互转 public void beanConvertJson(){ //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()); } // deepBean与json互转 public void deepBeanConvertJson(){ 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); //转为JavaBean对象,强转 Grade grade = (Grade)JSONObject.toBean(json, Grade.class); System.out.println(grade.toString()); } // list与json互转 public void listConvertJson(){ //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 void mapConvertJson(){ //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); } } public static void main(String[] args) { TestMain testMain=new TestMain(); //选择执行你想看的方法 // testMain.mapConvertJson(); testMain.deepBeanConvertJson(); } }