登錄頁面：

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.EventObject;

import javax.swing.AbstractButton;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

public class Login2 extends JFrame implements ActionListener{

JPanel jp=new JPanel();

JLabel name=new JLabel("請輸入用戶名");

JLabel password=new JLabel("請輸入密碼");

JLabel show=new JLabel("");

JLabel[] jl= {name,password,show};

JButton login=new JButton("登陸");

JButton reset=new JButton("重置");

JButton register=new JButton("注冊");

JButton[] jb= {login,reset,register};

private JTextField JName=new JTextField();

private JPasswordField JPassword=new JPasswordField();

private int i;

public Login2() {

jp.setLayout(null);

for(int i=0;i<3;i++) {

jl[i].setBounds(30,20+40*i,180,20);

jb[i].setBounds(30+100*i,100,80,20);

jp.add(jl[i]);

jp.add(jb[i]);

jb[i].addActionListener(this);

}

JName.setBounds(130,15,100,20);

jp.add(JName);

JName.addActionListener(this);

JPassword.setBounds(130,60,100,20);

jp.add(JPassword);

JPassword.setEchoChar('*');

JPassword.addActionListener(this);

jl[2].setBounds(10,180,270,20);

jp.add(jl[2]);

this.add(jp);

this.setTitle("農產品銷售系統登錄窗口");

this.setBounds(200,200,350,250);

this.setVisible(true);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

@Override

public void actionPerformed(ActionEvent arg0) {

EventObject e = null;

if(e.getSource()==JName) {

JPassword.requestFocus();

}

else if(e.getSource()==jb[i]) {

jl[2].setText("");

JName.setText("");

JPassword.setText("");

JName.requestFocus();

}

else if(e.getSource()==jb[2]) {

show.setText("進入農產品銷售系統注冊頁面");

}

else {

if(JName.getText().equals("qwer")&&

String.valueOf(JPassword.getPassword()).equals("1234")) {

jl[2].setText("登陸成功，歡迎您的到來！");

}

else {

jl[2].setText("對不起，您的用戶名或密碼錯誤！");

}

}

}

public static void main(String[] args) {

new Login2();

}

}

總結

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