java对象与json字符串的互相转换

1.采用 net.sf.json.JSONObject

maven依赖包：

1 <dependency>
2     <groupId>net.sf.json-lib</groupId>
3     <artifactId>json-lib</artifactId>
4     <version>2.4</version>
5     <classifier>jdk15</classifier>
6 </dependency>

java对象转换为json字符串：

1 import net.sf.json.JSONObject;
2 
3 public String ObjectToJsonStr(){
4         UserName userName = new UserName();
5         userName.setName("hahaha");
6         JSONObject json = JSONObject.fromObject(userName);//将java对象转换为json对象
7         String str = json.toString();//将json对象转换为json字符串
8         return str;
9     }

json字符串转换为java对象：

1 import net.sf.json.JSONObject;
2 
3 public UserName JsonStrToObject(String str){
4         JSONObject obj = new JSONObject().fromObject(str);//将json字符串转换为json对象
5         UserName userName = (UserName)JSONObject.toBean(obj,UserName.class);//将json对象转换为java对象
6         return userName;
7     }

2.采用 com.alibaba.fastjson.JSON

maven依赖包：

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.39</version>
</dependency>

java对象转换为json字符串：

1 import com.alibaba.fastjson.JSON;
2 
3 public String ObjectToJsonStr(UserName userName){
4         String str = JSON.toJSONString(userName);
5         return str;
6     }

json字符串转换为java对象：

1 import com.alibaba.fastjson.JSON;
2 
3 public UserName JsonStrToObject(String str){
4         UserName userName = JSON.parseObject(str, UserName.class);//将json字符串转换为java对象
5         return userName;
6     }