求解：用Java寫一段程序，能實現(xiàn)注冊用戶的，包含用戶名和密碼，郵箱的GUI程序。

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import javax.swing.*;

public class TestLogin implements ActionListener {

JTextField jtf1 = new JTextField(15);

JPasswordField jtf2 = new JPasswordField(15);

JTextField jtf3 = new JTextField(15);

JLabel jl0 = new JLabel("歡迎注冊！");

String result = "";

@Override

public void actionPerformed(ActionEvent e) {

String comn = e.getActionCommand();

if ("提交".equals(comn)) {

FileInputStream fis;

try {

fis = new FileInputStream("D:\\Program File\\image\\input.txt");

byte[] b = new byte[1024];

while (true) {

int num = fis.read(b);

if (num == -1)

break;

result = result + new String(b, 0, num);

}

fis.close();

} catch (FileNotFoundException e1) {

e1.printStackTrace();

} catch (IOException ioe) {

ioe.printStackTrace();

}

String[] s = result.split(";", 0);

String name = jtf1.getText();

String password = jtf2.getText();

String email = jtf3.getText();

String temp = name + "," + password + "," + email + ";";

boolean flag = true;

for (int i = 0; i s.length; i++) {

String[] name0 = s[i].split(",", 0);

if (name.equals(name0[0])) {

jl0.setText("你知彎輸入的用戶名重復(fù)啦！請重新輸入");

flag = false;

jtf1.setText("");

jtf2.setText("");

jtf3.setText("");

jtf1.requestFocus();

break;

}

}

if (flag) {

try {

FileOutputStream fos = new FileOutputStream(

"D:\\Program File\棗猛轎\image\\input.txt", true);

fos.write(temp.getBytes());

fos.close();

jl0.setText("恭喜你！注冊成功！");

jtf1.setText("");

jtf2.setText("");

jtf3.setText("");

jtf1.requestFocus();

} catch (Exception ae) {

ae.printStackTrace();

}

}

} else if ("清空".equals(comn)) {

jtf1.setText("");

jtf2.setText("");

jtf3.setText("凳肆");

jtf1.requestFocus();

}

}

public TestLogin() {

JFrame jf = new JFrame("登錄界面");

GridLayout gl = new GridLayout(5, 1);

jf.setLayout(gl);

JPanel[] jp = new JPanel[5];

for (int i = 0; i jp.length; i++) {

jp[i] = new JPanel();

jf.add(jp[i]);

}

jp[0].add(jl0);

JLabel jl1 = new JLabel("用戶名：");

jp[1].add(jl1);

jp[1].add(jtf1);

JLabel jl2 = new JLabel(" 密碼： ");

jp[2].add(jl2);

jp[2].add(jtf2);

JLabel jl3 = new JLabel(" Email：");

jp[3].add(jl3);

jp[3].add(jtf3);

JButton jb1 = new JButton("提交");

jp[4].add(jb1);

jb1.addActionListener(this);

JButton jb2 = new JButton("清空");

jp[4].add(jb2);

jb2.addActionListener(this);

jf.setLocation(300, 200);

jf.pack();

jf.setVisible(true);

jf.setDefaultCloseOperation(jf.EXIT_ON_CLOSE);

}

public static void main(String[] args) {

new TestLogin();

}

}

這個應(yīng)該就是你想要的答案！