1 package com.whroid.java.json;
 2 
 3 import com.google.gson.Gson;
 4 
 5 public class GsonUtil {
 6 
 7     /**
 8      * 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
 9      * @param json
10      * @param cls
11      * @return
12      */
13     public  static Object json2Object(String json,Class cls) {
14         Object obj = null;
15         try {
16             Gson gson = new Gson();
17             obj = gson.fromJson(json, cls);
18         } catch (Exception e) {
19             obj = new Object();
20         }
21         
22         return obj;
23     }
24 
25 
26     /**
27      * 将对象转换成json字符串
28      * @param object
29      * @return
30      */
31     public  static String object2JsonString(Object object) {
32         if(object == null){
33             return "";
34         }
35         Gson gson = new Gson();
36         return gson.toJson(object).toString();
37     }
38     
39 }

 1 package com.whroid.java.json;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 
 7 public class JSONBean {
 8 
 9     private String name  = "name";
10     private int id = 1;
11     private List<String> list = new ArrayList<String>();
12     private boolean b;
13     SubBean subBean = new SubBean();
14     
15     @Override
16     public String toString() {
17         return "JSONBean [name=" + name + ", id=" + id + ", list=" + list
18                 + ", b=" + b + ", subBean=" + subBean + "]";
19     }
20     
21     
22 }
23 class SubBean{
24     String subname = "subname";
25 
26     
27     @Override
28     public String toString() {
29         return "SubBean [subname=" + subname + "]";
30     }
31     
32 }

1 public static void main(String[] args) {
2         
3      JSONBean bean = new JSONBean();
4      String gson =     GsonUtil.object2JsonString(bean);
5      System.out.println("gson:"+gson);
6      bean = (JSONBean) GsonUtil.json2Object(gson, JSONBean.class);
7      System.out.println("bean:"+bean);
8         
9     }