用户登录界面代码

引用

注：这只是个登录测试参考，是练习知识点用的，
具体功能不完善；用户登录名：lianzhou    密码：admin

package org.tarena.day03;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class UserLogin implements ActionListener {

	JButton ok;

	JButton back;

	JTextField jtf1;

	JTextField jpwd;

	JFrame jf = new JFrame("用户登录");
	public void creatFrame() {

		// 添加组建；
		JPanel jp = new JPanel(new GridLayout(3, 2));
		JLabel jl1 = new JLabel("用户名");
		jtf1 = new JTextField(15);
		JLabel jl2 = new JLabel("密码");
		jpwd = new JTextField(15);
		ok = new JButton("确定");
		ok.addActionListener(this);
		back = new JButton("重置");
		back.addActionListener(this);
		jp.add(jl1);
		jp.add(jtf1);
		jp.add(jl2);
		jp.add(jpwd);
		jp.add(ok);
		jp.add(back);

		jf.add(jp);

		// 把窗口的四个边空出来；
		jf.add(BorderLayout.NORTH, new JPanel());
		jf.add(BorderLayout.SOUTH, new JPanel());
		jf.add(BorderLayout.EAST, new JPanel());
		jf.add(BorderLayout.WEST, new JPanel());
		// jf.pack();// 可自动调试窗口大小
		jf.setSize(250, 150);
		jf.setLocation(500, 500);
		jf.setVisible(true);
		jf.setResizable(false);
	}

	JFrame nf;

	// 创建一个新的窗口；
	public void newFrame(boolean flag) {
		nf = new JFrame("用户界面");
		JLabel jla = new JLabel();
		if (flag) {
			jla.setText("登录成功");
			nf.add(jla);
		} else {
//			jla.setText("登录失败");
//			nf.add(jla);
		}
		nf.setSize(300, 400);
		nf.setLocation(400, 400);
		nf.setVisible(true);
		nf.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
		nf.addWindowListener(new WindowListener() {

			public void windowActivated(WindowEvent e) {
			}

			public void windowClosed(WindowEvent e) {
			}

			public void windowClosing(WindowEvent e) {
				int i = JOptionPane.showConfirmDialog(null, "是否真的要退出界面？","用户界面",
						JOptionPane.YES_NO_CANCEL_OPTION);
				if(i==0){
					System.exit(i);					
				}//根据i的返回值来判断是否退出；
			}

			public void windowDeactivated(WindowEvent e) {
			}

			public void windowDeiconified(WindowEvent e) {
			}

			public void windowIconified(WindowEvent e) {
			}

			public void windowOpened(WindowEvent e) {
			}
		});
	}

	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == ok) {
			if ("lianzhou".equals(jtf1.getText())
					&& "admin".equals(jpwd.getText())) {
				jf.dispose();//隐藏登录窗口
				newFrame(true);
			} else {
				jtf1.setText("登录失败！");
				jpwd.setText("");
			}
		} else if (e.getSource() == back) {
			jtf1.setText("");
			jpwd.setText("");
		}
	}

	public static void main(String[] args) {
		UserLogin user = new UserLogin();
		user.creatFrame();
	}

}