登录 界面

[java]代码库

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package myframe;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

class AnnaPanel extends JPanel { //自定义一种面板
    @Override
    public void paintComponent(Graphics g) {  //重写paintComponent()方法，在面板上画图片作为背景
        ImageIcon icon = new ImageIcon("f://5.jpg");
        g.drawImage(icon.getImage(), 0, 0, this);
    }
}

public class Frame_Login extends JFrame implements ActionListener{

    //将用到的组件定义成全局变量，这样在该类里的所有方法里都能访问
    JLabel label1;
    JLabel label2;
    JTextField userID;
    JTextField pwd;
    JCheckBox autoLogin;
    JCheckBox rememberPwd;
    JButton login;
    JButton cancel;
    
    public Frame_Login() {

        //设置窗体格式
        this.setBounds(100, 100, 298, 300);  //此处窗体大小和图片一致
        this.setTitle("登录界面");
        this.setResizable(false);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        
        AnnaPanel panel = new AnnaPanel();   //创建一个自定义面板的对象，用于放置其他组件
        panel.setLayout(null);

        label1 = new JLabel("用户名");
        label1.setBounds(50, 60, 80, 30);
        panel.add(label1);  //将label1添加到面板上

        userID = new JTextField();
        userID.setBounds(100, 60, 100, 30);
        panel.add(userID);  //将文本框添加到面板上

        label2 = new JLabel("密码");
        label2.setBounds(50, 100, 80, 30);
        panel.add(label2);  //将label2添加到面板上

        pwd = new JTextField();
        pwd.setBounds(100, 100, 100, 30);
        panel.add(pwd);

        autoLogin = new JCheckBox("自动登录");
        autoLogin.setBounds(60, 150, 80, 30);
        autoLogin.setOpaque(false);
        panel.add(autoLogin);   //将复选框添加到面板上

        rememberPwd = new JCheckBox("记住密码");
        rememberPwd.setBounds(150, 150, 80, 30);
        rememberPwd.setOpaque(false);
        panel.add(rememberPwd);

        login = new JButton("登录");
        login.setBackground(Color.pink);
        login.setOpaque(false);
        login.setBounds(50, 200, 90, 30);  

        login.addActionListener(this);
        
        cancel = new JButton("取消");
        cancel.setBackground(Color.pink);
        cancel.setOpaque(false);  //设置按钮背景透明
        cancel.setBounds(150, 200, 90, 30);

        panel.add(login);  //将按钮添加到面板上
        panel.add(cancel); 
        
        this.add(panel);   //将面板添加到窗体上
        this.setVisible(true);
    }

    public static void main(String[] args) {
        Frame_Login frame = new Frame_Login();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if(userID.getText().equals("anna")&&pwd.getText().equals("123"))
        {
        JFrame frame=new JFrame("登录成功");
        frame.setBounds(100,100,200,200);
        frame.setVisible(true);
        }
        else
        JOptionPane.showMessageDialog(this, "用户名或密码不正确，请重新输入！");
    }

}