java对象和json对象之间互相转换

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import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class MainClass {

    public static void main(String[] args) {
        TestJsonBean();
        TestJsonAttribute();
        TestJsonArray();
    }

    @SuppressWarnings("rawtypes")
    private static void TestJsonArray() {
        Student student1 = new Student();
        student1.setId(1);
        student1.setName("jag");
        student1.setSex("man");
        student1.setAge(25);
        student1.setHobby(new String[]{"篮球","游戏"});

        Student student2 = new Student();
        student2.setId(2);
        student2.setName("tom");
        student2.setSex("woman");
        student2.setAge(23);
        student2.setHobby(new String[]{"上网","跑步"});

        List<Student> list = new ArrayList<Student>();
        list.add(student1);
        list.add(student2);

        JSONArray jsonArray = JSONArray.fromObject(list);
        System.out.println(jsonArray.toString());

        JSONArray new_jsonArray=JSONArray.fromObject(jsonArray.toArray());
        Collection java_collection=JSONArray.toCollection(new_jsonArray);
        if(java_collection!=null && !java_collection.isEmpty())
        {
            Iterator it=java_collection.iterator();
            while(it.hasNext())
            {
                JSONObject jsonObj=JSONObject.fromObject(it.next());
                Student stu=(Student) JSONObject.toBean(jsonObj,Student.class);
                System.out.println(stu.getName());
            }
        }
    }

    private static void TestJsonAttribute() {
        /**
         * 创建json对象并为该对象设置属性
         */
        JSONObject jsonObj = new JSONObject();
        jsonObj.put("Int_att",25);//添加int型属性
        jsonObj.put("String_att","str");//添加string型属性
        jsonObj.put("Double_att",12.25);//添加double型属性
        jsonObj.put("Boolean_att",true);//添加boolean型属性
        //添加JSONObject型属性
        JSONObject jsonObjSon = new JSONObject();
        jsonObjSon.put("id", 1);
        jsonObjSon.put("name", "tom");
        jsonObj.put("JSONObject_att",jsonObjSon);
        //添加JSONArray型属性
        JSONArray jsonArray = new JSONArray();
        jsonArray.add("array0");
        jsonArray.add("array1");
        jsonArray.add("array2");
        jsonArray.add("array3");
        jsonObj.put("JSONArray_att", jsonArray);
        System.out.println(jsonObj.toString());
        System.out.println("Int_att:"+jsonObj.getInt("Int_att"));
        System.out.println("String_att:"+jsonObj.getString("String_att"));
        System.out.println("Double_att:"+jsonObj.getDouble("Double_att"));
        System.out.println("Boolean_att:"+jsonObj.getBoolean("Boolean_att"));
        System.out.println("JSONObject_att:"+jsonObj.getJSONObject("JSONObject_att"));
        System.out.println("JSONArray_att:"+jsonObj.getJSONArray("JSONArray_att"));
    }

    /**
     * java对象与json对象互相转换
     */
    private static void TestJsonBean() {
        /**
         * 创建java对象
         */
        Student student = new Student();
        student.setId(1);
        student.setName("jag");
        student.setSex("man");
        student.setAge(25);
        student.setHobby(new String[]{"篮球","上网","跑步","游戏"});
        /**
         * java对象转换成json对象，并获取json对象属性
         */
        JSONObject jsonStu = JSONObject.fromObject(student);
        System.out.println(jsonStu.toString());
        System.out.println(jsonStu.getJSONArray("hobby"));
        /**
         * json对象转换成java对象，并获取java对象属性
         */
        Student stu = (Student) JSONObject.toBean(jsonStu, Student.class);
        System.out.println(stu.getName());
        /**
         * 创建json对象
         */
        JSONObject jsonObj = new JSONObject();
        jsonObj.put("id",1);
        jsonObj.put("name","张勇");
        jsonObj.put("sex","男");
        jsonObj.put("age",24);
        //jsonObj.put("hobby",new String[]{"上网","游戏","跑步","音乐"});
        //System.out.println(jsonObj.toString());
        /**
         * json对象转换成java对象
         */
        Student stud = (Student) JSONObject.toBean(jsonObj,Student.class);
        System.out.println(stud.getName());
    }
}