testactionlistener.java

一个很不错的事件代码~！希望大家喜欢

package UI;
import javax.swing.*;
import java.awt.Component;
import java.awt.GridLayout;
import java.awt.event.*;
public class TestActionListener implements ActionListener
{
	JButton btnLogin=new JButton("Login");
	JButton btnExit=new JButton("Exit");
	JTextField txtName=new JTextField("");
	JPasswordField txtPsw=new JPasswordField("");
	JLabel l=new JLabel("用户名:",JLabel.RIGHT);
	JLabel l1=new JLabel("口令:",JLabel.RIGHT);
	
	JFrame frame;
	public Component createComponents()
	{
		JPanel p=new JPanel(new GridLayout(3,2,4,4));
		p.add(l);
		p.add(txtName);
		p.add(l1);
		p.add(txtPsw);
		p.add(btnLogin);
		p.add(btnExit);
		btnLogin.addActionListener(this);
		btnLogin.setActionCommand("Login");
		btnExit.addActionListener(this);
		btnExit.setActionCommand("Exit");
		return p;
	}
	public void actionPerformed(ActionEvent e)
	{
		String strName=txtName.getText();
		String strPsw=txtPsw.getText();
		String strMsg="您输入的用户名为:"+strName+"口令为:"+strPsw;
		if(e.getActionCommand().equals("Login"))
		{
			JOptionPane.showMessageDialog(frame,strMsg);
			if(strName.equals("admin")&&strPsw.equals("admin"))
			{
				strMsg="登录成功!!";
				JOptionPane.showMessageDialog(frame,strMsg);
			}else
			{
				strMsg="用户名或口令不正确!";
				JOptionPane.showMessageDialog(frame,strMsg,"错误",JOptionPane.ERROR_MESSAGE);
			}
		}else
		{
			System.exit(0);
		}
	}
	public static void main(String[] args)
	{
		TestActionListener t1=new TestActionListener();
		t1.frame=new JFrame("行为事件事例窗口");
		t1.frame.getContentPane().add(t1.createComponents());
		t1.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		t1.frame.setSize(300,100);
		t1.frame.setVisible(true);
	}
}