java对象与json字符串的互相转换

1.采用 net.sf.json.JSONObject

maven依赖包：

11 <dependency>
22     <groupId>net.sf.json-lib</groupId>
33     <artifactId>json-lib</artifactId>
44     <version>2.4</version>
55     <classifier>jdk15</classifier>
66 </dependency>

java对象转换为json字符串：

11 import net.sf.json.JSONObject;
22 
33 public String ObjectToJsonStr(){
44         UserName userName = new UserName();
55         userName.setName("hahaha");
66         JSONObject json = JSONObject.fromObject(userName);//将java对象转换为json对象
77         String str = json.toString();//将json对象转换为json字符串
88         return str;
99     }

json字符串转换为java对象：

11 import net.sf.json.JSONObject;
22 
33 public UserName JsonStrToObject(String str){
44         JSONObject obj = new JSONObject().fromObject(str);//将json字符串转换为json对象
55         UserName userName = (UserName)JSONObject.toBean(obj,UserName.class);//将json对象转换为java对象
66         return userName;
77     }

2.采用 com.alibaba.fastjson.JSON

maven依赖包：

1<dependency>
2    <groupId>com.alibaba</groupId>
3    <artifactId>fastjson</artifactId>
4    <version>1.2.39</version>
5</dependency>

java对象转换为json字符串：

11 import com.alibaba.fastjson.JSON;
22 
33 public String ObjectToJsonStr(UserName userName){
44         String str = JSON.toJSONString(userName);
55         return str;
66     }

json字符串转换为java对象：

11 import com.alibaba.fastjson.JSON;
22 
33 public UserName JsonStrToObject(String str){
44         UserName userName = JSON.parseObject(str, UserName.class);//将json字符串转换为java对象
55         return userName;
66     }