import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

public class Test {

    public static void main(String[] args) {

        new Test().test1();

        new Test().test2();

        new Test().test3();

        new Test().test4();

        new Test().test5();

        new Test().test6();

        new Test().test7();

    }

    /**

     * JSON字符串转JSONObject对象

     */

    public void test1() {

        String jsonStr = "{\"name\":\"ZhangSan\",\"sex\":\"boy\",\"age\":18}";

        JSONObject jsonObj = JSONObject.fromObject(jsonStr);

        System.out.println(jsonObj.toString());

    }

    /**

     * 简单JSONObject对象转java对象

     */

    public void test2() {

        JSONObject jsonObj = new JSONObject();

        jsonObj.put("name", "LiSi");

        jsonObj.put("sex", "girl");

        jsonObj.put("age", 17);

        Student student = (Student) JSONObject.toBean(jsonObj, Student.class);

        System.out.println(student.getName() + " | " + student.getSex() + " | " + student.getAge());

    }

    /**

     * 复杂JSONObject对象转java对象

     */

    @SuppressWarnings("rawtypes")

    public void test3() {

        List<Student> students = new ArrayList<Student>();

        students.add(new Student("ZhangSan", "boy", 18));

        students.add(new Student("LiSi", "girl", 17));

        BanJi banji = new BanJi();

        banji.setBanJiName("日语二班");

        banji.setStudents(students);

        JSONObject jsonObj = JSONObject.fromObject(banji);

        Map<String, Class> classMap = new HashMap<String, Class>();

        classMap.put("students", Student.class);

        BanJi banji2 = (BanJi) JSONObject.toBean(jsonObj, BanJi.class, classMap);

        System.out.println(banji2.getStudents().get(0).getName()); // 验证转换是否成功

    }

    /**

     * 简单java集合对象转JSONArray

     */

    public void test4() {

        List<Student> students = new ArrayList<Student>();

        students.add(new Student("ZhangSan", "boy", 18));

        students.add(new Student("LiSi", "girl", 17));

        JSONArray jsonArray = JSONArray.fromObject(students);

        System.out.println(jsonArray.toString());

    }

    /**

     * JSONArray转java集合对象

     */

    @SuppressWarnings({ "unchecked", "deprecation" })

    public void test5() {

        JSONObject jsonObj1 = new JSONObject();

        jsonObj1.put("name", "ZhangSan");

        jsonObj1.put("sex", "boy");

        jsonObj1.put("age", 18);

        JSONObject jsonObj2 = new JSONObject();

        jsonObj2.put("name", "lisi");

        jsonObj2.put("sex", "girl");

        jsonObj2.put("age", 17);

        JSONArray jsonArray = new JSONArray();

        jsonArray.add(0, jsonObj1);

        jsonArray.add(1, jsonObj2);

        List<Student> students3 = JSONArray.toList(jsonArray, Student.class);

        System.out.println(students3.get(0).getName());

        System.out.println(students3.get(1).getName());

    }

    /**

     * 复杂java集合对象转JSONArray

     */

    @SuppressWarnings({ "rawtypes", "unchecked", "deprecation" })

    public void test6() {

        BanJi banji1 = new BanJi();

        banji1.setBanJiName("日语一班");

        List<Student> students1 = new ArrayList<Student>();

        students1.add(new Student("ZhangSan", "boy", 18));

        banji1.setStudents(students1);

        BanJi banji2 = new BanJi();

        banji2.setBanJiName("日语二班");

        List<Student> students2 = new ArrayList<Student>();

        students1.add(new Student("LiSi", "girl", 17));

        banji2.setStudents(students2);

        List<BanJi> banjiList = new ArrayList<BanJi>();

        banjiList.add(banji1);

        banjiList.add(banji2);

        JSONArray jsonArray = JSONArray.fromObject(banjiList);

        Map<String, Class> classMap = new HashMap<String, Class>();

        classMap.put("students", Student.class);

        List<BanJi> banjiList2 = JSONArray.toList(jsonArray, BanJi.class, classMap);

        System.out.println(banjiList2.get(0).getStudents().get(0).getName());

    }

    /**

     * 拆分JSONArray为JSONObject

     */

    public void test7() {

        JSONObject jsonObj1 = new JSONObject();

        jsonObj1.put("name", "ZhangSan");

        jsonObj1.put("sex", "boy");

        jsonObj1.put("age", 18);

        JSONObject jsonObj2 = new JSONObject();

        jsonObj2.put("name", "lisi");

        jsonObj2.put("sex", "girl");

        jsonObj2.put("age", 17);

        JSONArray jsonArray = new JSONArray();

        jsonArray.add(0, jsonObj1);

        jsonArray.add(1, jsonObj2);

        JSONObject object = (JSONObject) jsonArray.get(0);

        System.out.println(object.toString());

    }

}

import java.util.List;

/**

 * 班级类

 */

public class BanJi {

    private String banJiName; // 班级名

    private List<Student> students; // 学生

    /**

     * 构造函数

     */

    public BanJi() {

        super();

    }

    // getters/setters(略)

}

/**

 * 学生类

 */

public class Student {

    private String name; // 姓名

    private String sex; // 性别

    private int age; // 年龄

    /**

     * 构造函数

     */

    public Student() {

        super();

    }

    /**

     * 构造函数

     */

    public Student(String name, String sex, int age) {

        super();

        this.name = name;

        this.sex = sex;

        this.age = age;

    }

    // getters/setters(略)

}