java 怎么把map转为json

Posted 2023-02-28

①如果你是maven工程，添加下面依赖:net.sf.json-libjson-lib2.4jdk15②如果不是maven工程，我帮你把jar包上传到云盘了，你下载后放到lib下面2、使用方法packagetest;importjava.util.HashMap;importjava.util.Map;importnet.sf.json.JSONObject;publicclassTest01publicstaticvoidmain(String[]args)Mapmap=newHashMap();map.put("1","bb");map.put("2","cc");map.put("3","dd");JSONObjectjsonObject=JSONObject.fromObject(map);System.out.println(jsonObject);

参考技术A public class User

private String username;
private String password;

public String getUsername()
return username;

public void setUsername(String username)
this.username = username;

public String getPassword()
return password;

public void setPassword(String password)
this.password = password;