JsonHelper

package com.chauvet.utils;

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 JsonHelper{

    public static void main(String[] args) {
        
        JSONObject jsonObject = object2Json();
        System.out.println(jsonObject.toString());  
        
        JSONArray jsonArray = List2Json();
        System.out.println(jsonArray.toString());
        
        jsonObject2object(jsonObject);
        
        JsonArray2List(jsonArray);
        
    }
    
    /***
     * 对象转成JSONObject
     * @return
     */
    public static JSONObject object2Json(){
        Student s1 = new Student();
        s1.setId("1");
        s1.setName("1");
         /** 
         * java对象转换成json对象，并获取json对象属性 
         */  
        JSONObject jsonStu = JSONObject.fromObject(s1);  
        return jsonStu;
    }
    
    /***
     * list转JSONArray
     * @return
     */
    public static JSONArray List2Json(){
        Student s1 = new Student();
        s1.setId("1");
        s1.setName("1");        
        Student s2 = new Student();
        s2.setId("2");
        s2.setName("2");        
        Student s3 = new Student();
        s3.setId("3");
        s3.setName("3");        
        List<Student> stuList = new ArrayList<Student>();
        stuList.add(s1);
        stuList.add(s2);
        stuList.add(s3);
         /** 
         * List转换成json
         */  
        JSONArray  jsonArray = JSONArray.fromObject(stuList);
        return jsonArray;
    }
    
    /***
     * JSONObject转对象
     * @param jsonStr
     */
    public static void jsonObject2object(JSONObject jsonStr){
        /** 
         * json对象转换成java对象，并获取java对象属性 
         */  
        Student stu = (Student) JSONObject.toBean(jsonStr, Student.class);  
        System.out.println(stu.getId());
        System.out.println(stu.getName());  
    }
    
    /***
     * JSONArray 转 List
     * @param jsonArray
     */
    public static void JsonArray2List(JSONArray  jsonArray){
        Collection<?> c = JSONArray.toCollection(jsonArray);
        Iterator<?> it=c.iterator();  
        while (it.hasNext()) {
             JSONObject jsonObj=JSONObject.fromObject(it.next());  
             Student stu=(Student) JSONObject.toBean(jsonObj,Student.class);  
             System.out.println(stu.getId());
             System.out.println(stu.getName());  
        }
    }
    
    
}