java对象与JSON字符串互转

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想完成java对象转换成JSON字符串必须在项目中导入以下jar包，缺一不可：
这里写图片描述

首先创建一个实体类Student.java

package com.zhk.bean;public class Student {    private String name;    private int age;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    @Override    public String toString(){        return this.name+"  "+this.age;    }}

其次创建TestJson.java类

package com.zhk.jsontojava;import java.util.ArrayList;import java.util.List;import com.zhk.bean.Student;import net.sf.json.JSONArray;import net.sf.json.JSONObject;public class TestJson {    //java对象转为json字符串    public static void test1(){        Student stu = new Student();        stu.setName("James");        stu.setAge(35);        JSONObject jsonobj = JSONObject.fromObject(stu);        String jsonstr = jsonobj.toString();        System.out.println(jsonstr);    }    //java数组（集合）转换为JSON字符串    public static void test2(){        List<Student> slist = new ArrayList<Student>();        for(int i=0;i<3;i++){            Student stu = new Student();            stu.setName("zhang"+i);            stu.setAge(20+i+1);            slist.add(stu);        }        JSONArray jsonarray = JSONArray.fromObject(slist);         String jsonstr = jsonarray.toString();        System.out.println(jsonstr);    }    //json字符串转换为java对象    public static void test3(){        String jsonstr = "{\"name\":\"zhang\",\"age\":15}";        JSONObject jsonobj = JSONObject.fromObject(jsonstr);        Student stu = (Student) JSONObject.toBean(jsonobj, Student.class);        System.out.println(stu);    }    //JSON字符串转换成java数组（集合）    public static void test4(){        String jsonstr = "[{\"name\":\"zhang\",\"age\":15},"+                        "{\"name\":\"zhao\",\"age\":16},"+                        "{\"name\":\"wang\",\"age\":25}]";        JSONArray jsonsrr = JSONArray.fromObject(jsonstr);        List<Student> slist = (List<Student>) JSONArray.toCollection(jsonsrr, Student.class);        for (Student student : slist) {            System.out.println(student);        }    }    public static void main(String[] args) {        //test1();        //test2();        //test3();        test4();    }}

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