test4.java

编写一个用户注册信息填写验证程序

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Test4 extends JFrame implements ActionListener,TextListener
{
	private JLabel username,password,email,telephone;
	private JTextField usernameField,emailField;
	private TextField teleField;
	private JPasswordField passwordField;
	private JButton registButton,cancelButton;

	public Test4()
	{
		super("用户注册");
		Container container = getContentPane();
		container.setLayout(new FlowLayout());
		username = new JLabel("用户名");
		username.setToolTipText("请输入用户名");
		password = new JLabel("密   码");
		password.setToolTipText("密码不能少于6位");
		email = new JLabel("邮   箱");
		email.setToolTipText("邮箱中必须包含@字符");
		telephone = new JLabel("电   话");
		telephone.setToolTipText("电话只能为数字");
		usernameField = new JTextField(15);
		usernameField.addActionListener(this);
		passwordField = new JPasswordField(15);
		passwordField.addActionListener(this);
		emailField = new JTextField(15);
		emailField.addActionListener(this);
		teleField = new TextField(21);
		teleField.addActionListener(this);
		teleField.addTextListener(this);
		registButton = new JButton("注册");
		cancelButton = new JButton("取消");
		container.add(username);
		container.add(usernameField);
		container.add(password);
		container.add(passwordField);
		container.add(email);
		container.add(emailField);
		container.add(telephone);
		container.add(teleField);
		container.add(registButton);
		container.add(cancelButton);
		registButton.addActionListener(this);
		cancelButton.addActionListener(this);
		setSize(250,200);
		setVisible(true);
		setResizable(false);
	}

	public void textValueChanged(TextEvent event)
	{
		if (event.getSource() == teleField)
		{
			if (!checkNumber(teleField.getText()))
			{
				JOptionPane.showMessageDialog(this,"电话必须为数字","温馨提示",JOptionPane.INFORMATION_MESSAGE);
				teleField.setText("");
			}
		}
	}
		
	public void actionPerformed(ActionEvent event)
	{
		if (event.getSource() == usernameField)
		{
			if (usernameField.getText().equals(""))
			{
				JOptionPane.showMessageDialog(null,"用户名不能为空","温馨提示",JOptionPane.INFORMATION_MESSAGE);
			}
		}
		if (event.getSource() == passwordField)
		{
			if (passwordField.getPassword().length == 0)
			{
				JOptionPane.showMessageDialog(this,"密码不能为空","温馨提示",JOptionPane.INFORMATION_MESSAGE);
			}
			else if (passwordField.getPassword().length < 6)
			{
				JOptionPane.showMessageDialog(this,"密码长度不能小于6位","温馨提示",JOptionPane.INFORMATION_MESSAGE);
				passwordField.setText("");
			}
		}
		if (event.getSource() == emailField)
		{
			if (emailField.getText().indexOf("@") < 0 || emailField.getText().indexOf("@") >= (emailField.getText().length() - 1) || emailField.getText().equals(""))
			{
				JOptionPane.showMessageDialog(this,"您的邮箱格式不正确","温馨提示",JOptionPane.INFORMATION_MESSAGE);
				emailField.setText("");
			}
		}
		if (event.getSource() == teleField)
		{
			if (teleField.getText().equals(""))
			{
				JOptionPane.showMessageDialog(this,"联系电话不能为空","温馨提示",JOptionPane.INFORMATION_MESSAGE);
			}
			else if (!checkNumber(teleField.getText()))
			{
				JOptionPane.showMessageDialog(this,"电话必须为数字","温馨提示",JOptionPane.INFORMATION_MESSAGE);
				teleField.setText("");
			}
		}
		if (event.getSource() == registButton)
		{
			if (usernameField.getText().equals("") || passwordField.getPassword().length == 0 || emailField.getText().equals("") || teleField.getText().equals(""))
			{
				JOptionPane.showMessageDialog(this, "您填写的信息不完整","温馨提示",JOptionPane.INFORMATION_MESSAGE);
				usernameField.setText("");
				passwordField.setText("");
				emailField.setText("");
				teleField.setText("");
			}
			else if (passwordField.getPassword().length < 6)
			{
				JOptionPane.showMessageDialog(this,"密码长度不能小于6位","温馨提示",JOptionPane.INFORMATION_MESSAGE);
				passwordField.setText("");
			}
			else if (emailField.getText().indexOf("@") < 0 || emailField.getText().indexOf("@") >= (emailField.getText().length() - 1))
			{
				JOptionPane.showMessageDialog(this,"您的邮箱格式不正确","温馨提示",JOptionPane.INFORMATION_MESSAGE);
				emailField.setText("");
			}
			else if (!checkNumber(teleField.getText()))
			{
				JOptionPane.showMessageDialog(this,"电话必须为数字","温馨提示",JOptionPane.INFORMATION_MESSAGE);
				teleField.setText("");
			}
			else
				JOptionPane.showMessageDialog(this,"恭喜您,注册成功","温馨提示",JOptionPane.INFORMATION_MESSAGE);
		}
		if (event.getSource() == cancelButton)
		{
			usernameField.setText("");
			passwordField.setText("");
			emailField.setText("");
			teleField.setText("");
		}
	}

	public boolean checkNumber(String str)
	{
		for (int i=0 ;i<str.length() ;i++ )
		{
			if (str.charAt(i) < 48 || str.charAt(i) > 57)
			{
				return false;
			}
		}
		return true;
	}

	public static void main(String args[])
	{
		Test4 application = new Test4();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}