java账号密码登录代码 java账号密码登录代码三次

模拟一个简单的用户登陆程序，判断登录的用户名和密码是否正确，输出登录判断结果，用java怎么写？

package test;\x0d\x0aimport java.util.Scanner;\x0d\x0apublic class TestLogin {\x0d\x0aprivate static final String USERNAME = "Tom";//此处定义用户名\x0d\x0aprivate static final String PASSWORD = "123";//定义密码\x0d\x0apublic static void main(String[] args) {\x0d\x0aScanner sc = new Scanner(System.in);\x0d\x0aSystem.out.print("请输入您的用户名:");\x0d\x0aString username_in = sc.next();\x0d\x0aSystem.out.print("请输入您的密码:");\x0d\x0aString password_in = sc.next();\x0d\x0aif(username_in.equals(USERNAME) password_in.equals(PASSWORD)){\x0d\x0aSystem.out.println("登录成功");\x0d\x0a}else{\x0d\x0aSystem.out.println("用户名或密码错误");\x0d\x0a}\x0d\x0a}\x0d\x0a} \x0d\x0a这是从控制台输入的最简单的方法。

相关问答

Q1: 用JAVA编一个用户登录界面，用户必须输入账号密码才能进入

简单代码如下，原本想用弹窗的，懒得写了：

import java.awt.Container;

import java.awt.FlowLayout;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextField;

public class dengru extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;

    private Container c = null;

    private JButton jb = null;

    public dengru() {

        this.setLayout(new FlowLayout());

        jb = new JButton("登入");

        jb.addActionListener(this);

        this.add(jb);

        this.setSize(500, 400);

        this.setVisible(true);

        this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);

    }

    public static void main(String[] args) {

              new  dengru();

    }

    @Override

    public void actionPerformed(ActionEvent e) {

        if (e.getSource() == jb) {

            JFrame jf=new JFrame();

            c = jf.getContentPane();

            c.setLayout(new GridLayout(3,2,2,2));

            JLabel jl1 = new JLabel("用户名：");

            JLabel jl2 = new JLabel("密    码：");

            JTextField jtf1 = new JTextField();

            JTextField jtf2 = new JTextField();

            jtf1.setSize(200, 40);

            jtf2.setSize(200, 40);

            c.add(jl1);

            c.add(jtf1);

            c.add(jl2);

            c.add(jtf2);

            c.add(new JButton("登入"));

            jf.setVisible(true);

            jf.setSize(300, 100);

            jf.setDefaultCloseOperation(DISPOSE_ON_CLOSE);

        }

    }

}

Q2: 登陆界面的java代码怎么写？

import java.awt.*; \x0d\x0aimport javax.swing.*; \x0d\x0aimport java.awt.event.*; \x0d\x0aimport java.sql.*; \x0d\x0a\x0d\x0aclass LoginFrm extends JFrame implements ActionListener \x0d\x0a{ \x0d\x0aJLabel lbl1=new JLabel("用户名"); \x0d\x0aJLabel lbl2=new JLabel("密码"); \x0d\x0aJTextField txt=new JTextField(15); \x0d\x0aJPasswordField pf=new JPasswordField(); \x0d\x0aJButton btn1=new JButton("确定"); \x0d\x0aJButton btn2=new JButton("取消"); \x0d\x0a\x0d\x0apublic LoginFrm() \x0d\x0a{ \x0d\x0athis.setTitle("登陆"); \x0d\x0aJPanel jp=(JPanel)this.getContentPane(); \x0d\x0ajp.setLayout(new GridLayout(3,2,10,10)); \x0d\x0ajp.add(lbl1);jp.add(txt); \x0d\x0ajp.add(lbl2);jp.add(pf); \x0d\x0ajp.add(btn1);jp.add(btn2); \x0d\x0abtn1.addActionListener(this); \x0d\x0abtn2.addActionListener(this); \x0d\x0a} \x0d\x0a\x0d\x0apublic void actionPerformed(ActionEvent ae) \x0d\x0a{ \x0d\x0aif(ae.getSource()==btn1) \x0d\x0a{ \x0d\x0atry \x0d\x0a{ \x0d\x0aClass.forName("sun.jdbc.odbc.JdbcOdbcDriver")java账号密码登录代码； \x0d\x0aConnection con=DriverManager.getConnection("jdbc:odbc:MyDB","",""); \x0d\x0aStatement cmd=con.createStatement(); \x0d\x0aResultSet rs=cmd.executeQuery("select * from loginAndpassword where login='"+txt.getText()+"' and password='"+pf.getText()+"'"); \x0d\x0aif(rs.next()) \x0d\x0a{ \x0d\x0aJOptionPane.showMessageDialog(null,"登陆成功java账号密码登录代码！"); \x0d\x0a} \x0d\x0aelse \x0d\x0aJOptionPane.showMessageDialog(null,"用户名或密码错误！"); \x0d\x0a} catch(Exception ex){} \x0d\x0a\x0d\x0aif(ae.getSource()==btn2) \x0d\x0a{ \x0d\x0atxt.setText(""); \x0d\x0apf.setText(""); \x0d\x0a} \x0d\x0a} \x0d\x0a} \x0d\x0a\x0d\x0apublic static void main(String arg[]) \x0d\x0a{ \x0d\x0aJFrame.setDefaultLookAndFeelDecorated(true); \x0d\x0aLoginFrm frm=new LoginFrm(); \x0d\x0afrm.setSize(400,200); \x0d\x0afrm.setVisible(true); \x0d\x0a} \x0d\x0a}

Q3: JAVA中密码登陆代码怎么写

看一下apache httpclientjava账号密码登录代码的包java账号密码登录代码，现成java账号密码登录代码的代码

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