Java达成一个登录窗体功能

发布时间：2021-11-24 15:39:35 所属栏目：PHP教程来源：互联网

导读：This program shows a Login window based on Swing JFrame. When you input the correct userID and Password, you can obtain a confirmation, or else you will be alerted by a Java standard message window. The Swing JFrame used in the same time th

This program shows a "Login" window based on Swing JFrame. When you input the correct userID and Password, you can obtain a confirmation, or else you will be alerted by a Java standard message window.

The Swing JFrame used in the same time the GridLayout for the Container and the FlowLayout for the JPanel.

[java]
package com.han;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Arrays;

import javax.swing.*;

/**
* This program shows a "Login" window based on Swing JFrame.
* When you input the correct userID and Password, you can obtain a confirmation,
* or else you will be alerted by a JAVA standard message window.
* <p>
* The Swing JFrame used in the same time the GridLayout for the Container and the FlowLayout for the JPanel.
* @author han
*
*/
public class SwingJFrameLogin {
    /*define all the necessary member variables*/
    String s1=null;
    char[] s2=null;
    JFrame frame=new JFrame();
    Container c=frame.getContentPane();
    /*the construct function*/
    public SwingJFrameLogin() {
        c.setLayout(new GridLayout(3,1,10,10));//the Container uses the GridLayout for 3 JPanels
        JPanel panel1=new JPanel(new FlowLayout(FlowLayout.CENTER));//each JPanel uses the FlowLayout
        JPanel panel2=new JPanel(new FlowLayout(FlowLayout.CENTER));
        JPanel panel3=new JPanel(new FlowLayout());
        JLabel label1=new JLabel("用户名：");
        final JTextField jt=new JTextField(10);
        JLabel label2=new JLabel("密码：");
        final JPasswordField jp=new JPasswordField(6);
        jp.setEchoChar((char) 0);//set the display words as visible.
        final JButton jb1 = new JButton("提交");
        final JButton jb2 = new JButton("重置");
        panel1.add(label1);
        panel1.add(jt);
        panel2.add(label2);
        panel2.add(jp);
        panel3.add(jb1);
        panel3.add(jb2);
        c.add(panel1);
        c.add(panel2);
        c.add(panel3);
        jb1.addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e) {
                String s1=jt.getText();
                char[] s2=jp.getPassword();
                System.out.println(s1);
                System.out.println(s2);
                char[] pw={'u','p','s'};
                /*System.out.println(Arrays.equals(s2,pw));
                System.out.println(s1.equals("han"));*/
                if (s1.equals("han") && Arrays.equals(s2,pw)) {
                    JOptionPane.showMessageDialog(frame,
                            "登录成功！","Message",JOptionPane.INFORMATION_MESSAGE);
                    //frame.dispose();（等同于点击关闭窗口时执行frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE );）
                    System.exit(0);//正常退出（等同于点击关闭窗口时执行frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );）
                }
                else {
                    JOptionPane.showMessageDialog(frame,//it is a JAVA internal STD message BOX
                            "You had input a wrong userID !!","Warning",JOptionPane.WARNING_MESSAGE);
                }
                Arrays.fill(s2,'0'); //Zero out the possible password, for security.
            }
        });
        jb2.addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e) {//set all the fields empty.
                jt.setText("");
                jp.setText("");
            }
        });
        frame.pack();//automatically resize all the components to their preferred sizes.
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
    }

    public static void main(String[] args) {
        new SwingJFrameLogin();
    }
}

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