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 }