使用Gson解析JSON数据

本文使用gson对json进行解析处理

首先，下载gson包 ，本文使用(gson-1.6.jar)

 package com.whroid.java.json;

 import com.google.gson.Gson;

 public class GsonUtil {

     /**
      * 将json字符串转换成对象。需要保证json中的key和对象的属性名以及属性一致
      * @param json
      * @param cls
      * @return
      */
     public  static Object json2Object(String json,Class cls) {
         Object obj = null;
         try {
             Gson gson = new Gson();
             obj = gson.fromJson(json, cls);
         } catch (Exception e) {
             obj = new Object();
         }

         return obj;
     }

     /**
      * 将对象转换成json字符串
      * @param object
      * @return
      */
     public  static String object2JsonString(Object object) {
         if(object == null){
             return "";
         }
         Gson gson = new Gson();
         return gson.toJson(object).toString();
     }

 }

添加实例对象JSONBean(可以不设置getter()/setter()方法，但必须保证属性名和类型一致)

 package com.whroid.java.json;

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

 public class JSONBean {

     private String name  = "name";
     private int id = 1;
     private List<String> list = new ArrayList<String>();
     private boolean b;
     SubBean subBean = new SubBean();

     @Override
     public String toString() {
         return "JSONBean [name=" + name + ", id=" + id + ", list=" + list
                 + ", b=" + b + ", subBean=" + subBean + "]";
     }

 }
 class SubBean{
     String subname = "subname";

     @Override
     public String toString() {
         return "SubBean [subname=" + subname + "]";
     }

 }

调用介绍

 public static void main(String[] args) {

      JSONBean bean = new JSONBean();
      String gson =     GsonUtil.object2JsonString(bean);
      System.out.println("gson:"+gson);
      bean = (JSONBean) GsonUtil.json2Object(gson, JSONBean.class);
      System.out.println("bean:"+bean);

     }

返回结果：

gson:{"name":"name","id":1,"list":[],"b":false,"subBean":{"subname":"subname"}}

//使用解析gson返回的数据，进行对象实例
bean:JSONBean [name=name, id=1, list=[], b=false, subBean=SubBean [subname=subname]]