JSON类型转换

浏览数：51 / 时间：2015年06月09日

1. 把java 对象列表转换为json对象数组，并转为字符串

复制代码代码如下:

    JSONArray array = JSONArray.fromObject(userlist);
    String jsonstr = array.toString();

2.把java对象转换成json对象，并转化为字符串

复制代码代码如下:

  JSONObject object = JSONObject.fromObject(invite);
   String str=object.toString());

3.把JSON字符串转换为JAVA 对象数组

复制代码代码如下:

  String personstr = getRequest().getParameter("persons");
  JSONArray json = JSONArray.fromObject(personstr);
  List<InvoidPerson> persons = (List<InvoidPerson>)JSONArray.toCollection(json, nvoidPerson.class);

4.把JSON字符串转换为JAVA 对象

复制代码代码如下:

JSONObject jsonobject = JSONObject.fromObject(str);
PassportLendsEntity passportlends = null;
try {
   //获取一个json数组
   JSONArray array = jsonobject.getJSONArray("passports");
   //将json数组转换成 List<PassPortForLendsEntity>泛型
   List<PassPortForLendsEntity> list = new ArrayList<PassPortForLendsEntity>();
   for (int i = 0; i < array.size(); i++) {
            JSONObject object = (JSONObject)array.get(i);
            PassPortForLendsEntity passport = (PassPortForLendsEntity)JSONObject.toBean(object,
              PassPortForLendsEntity.class);
            if(passport != null){
             list.add(passport);
            }
     }
   //转换PassportLendsEntity 实体类
passportlends = (PassportLendsEntity)JSONObject.toBean(jsonobject, PassportLendsEntity.class);

str = "{\"lendperson\":\"李四\",\"lendcompany\":\"有限公司\",\"checkperson\":\"李四\",

\"lenddate\":\"2010-07-19T00:00:00\",\"lendcounts\":4,\"
passports\":[{\"passportid\":\"d\",\"name\":\"李豫川\",\"passporttype\":\"K\"},
{\"passportid\":\"K9051\",\"name\":\"李平\",\"passporttype\":\"K\"},
{\"passportid\":\"K90517\",\"name\":\"袁寒梅\",\"passporttype\":\"K\"},
{\"passportid\":\"K905199\",\"name\":\"贺明\",\"passporttype\":\"K\"}]}";

------------------------------------------------------自己动手写的代码------------------------------------------------------------

package com.springDemo.animal;

/**
* @ClassName: Cat
* @Description: 测试用的实体类
* @Author：huangshijie
* @CreateDate：2015年1月15日上午10:53:30
* @Modifior：
* @ModifyDate：
* @ModifyNotes：
*/
public class Cat {
   private String name;
   private String sex;
   private String color;

   public Cat(){}

   public Cat(String name,String sex,String color){
       this.name = name;
       this.sex =sex;
       this.color = color;
   }

   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getSex() {
       return sex;
   }
   public void setSex(String sex) {
       this.sex = sex;
   }
   public String getColor() {
       return color;
   }
   public void setColor(String color) {
       this.color = color;
   }

}

package com.springDemo.animal;

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

import net.sf.json.JSONArray;

/**
* @ClassName: EntityFromJSON
* @Description: 从JSON转成实体类的ArrayList
* @Author：huangshijie
* @CreateDate：2015年1月15日上午10:52:53
* @Modifior：
* @ModifyDate：
* @ModifyNotes：
*/
public class EntityFromJSON {

   public static void main(String[] args){
       Cat cat1 = new Cat("cat1","male","black");
       Cat cat2 = new Cat("cat2","female","white");
       Cat cat3 = new Cat("cat3","male","grey");
       Cat cat4 = new Cat("cat4","female","black");

       ArrayList<Cat> catList = new ArrayList<Cat>();

       catList.add(cat1);
       catList.add(cat2);
       catList.add(cat3);
       catList.add(cat4);

       JSONArray jsonArray = JSONArray.fromObject(catList);

       @SuppressWarnings("unchecked")
       List<Cat> catList2 = (List<Cat>)JSONArray.toCollection(jsonArray, Cat.class);

       Iterator<Cat> iterator = catList2.iterator();

       while(iterator.hasNext()){
           Cat tmpCat = iterator.next();
           System.out.print(tmpCat.getName()+",");
           System.out.print(tmpCat.getSex()+",");
           System.out.println(tmpCat.getColor());
       }

   }

}