本人使用的是 android2.2

需要下载软件包：gson-2.8.0.jar

本文主要介绍类的转化和反转

首先建一个user类

public class userInfo {
    private String user;
    private String passWord;
    public userInfo(String user,String passWord) {
        this.user = user;
        this.passWord = passWord;
    }

    public String getUser(){
        return user;
    }

    public String getPassWord(){
        return passWord;
    }

    public void setUser(String user){
        this.user=user;
    }

    public void setPassWord(String passWord){
        this.passWord=passWord;
    }
}

转json
userInfo uer=new userInfo("xxx","xxx");
Gson gson=new Gson();
String x=gson.toJson(uer);
转化结果：{
  "passWord": "xxx",
  "user": "xxx"
}

未完：