Java landing layered Structure design idea

Entity class

public class User {    private String id;    private String username;    private String password;    public User(){}    public String getId() {        return id;    }    public void setId(String id) {        this.id = id;    }    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;    }}

Presentation layer:

//输入输出public class LoginUI {    public User input()    {        User user = new User();        Scanner scanner = new Scanner(System.in);        System.out.print("用户名：");        String username = scanner.nextLine();        System.out.print("密码：");        String password = scanner.nextLine();        user.setUsername(username);        user.setPassword(password);        return user;    }    public void output(boolean flag)    {        if(flag)        {            System.out.println("登陆成功");        }else        {            System.out.println("登陆失败");        }    }}

Business layer:

  Import java.io.file;import org.dom4j.document;import org.dom4j.element;import org.dom4j.io.SAXReader; Import Org.junit.test;public class Loginbusiness {@Test public void Logingtet () throws Exception {Loginu        I Loginui = new Loginui ();        Loginbusiness lognbusiness = new loginbusiness ();        User user = Loginui.input ();        Boolean flag = Lognbusiness.check (user);    Loginui.output (flag);        }//Judge public boolean check (user user) throws Exception {Boolean flag = false;        Saxreader Saxreader = new Saxreader ();        Document document = Saxreader.read (new File ("Src/day2/domx/users.xml"));        String XPath = "//user[@username = '" +user.getusername () + "' and @password = '" "+user.getpassword () +" '] ";        element element = (Element) Document.selectsinglenode (XPath);        if (element!=null) {flag = true;        } return flag; }}

File
User.xml
<?xml version= "1.0" encoding= "UTF-8"?>

-<root>

<user password= "123456" username= "Liwen" id= "id001"/>

<user password= "23456" username= "python" id= "id002"/>

</root>

Java landing layered Structure design idea