java对象和json对象之间互相转换

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());		
	}
}