loginui.java

基于java的文件管理系统 能实现包括文件的创建、删除、查找等功能

package fileSys.UI;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Map;
import java.util.Set;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

import fileSys.util.UserAndPsw;

/**
 * 
 * 实现登陆界面
 */
public class LoginUI {

	private UserAndPsw userAndpsw = new UserAndPsw();

	@SuppressWarnings("serial")
	public LoginUI() {

		final JFrame frame = new JFrame("用户登陆");
		frame.setLocation(500, 260);

		JPanel basicPanel = (JPanel) frame.getContentPane();
		basicPanel.setPreferredSize(new Dimension(300, 200));

		GridBagLayout layout = new GridBagLayout();
		GridBagConstraints c = new GridBagConstraints();
		basicPanel.setLayout(layout);

		JPanel logoPanel = new JPanel() {

			ImageIcon image = new ImageIcon("image/03.jpg");

			protected void paintComponent(Graphics g) {
				setOpaque(true);
				super.paintComponent(g);
				g.drawImage(image.getImage(), 0, 0, 300, 60, null);
			}
		};
		logoPanel.setPreferredSize(new Dimension(300, 60));

		JPanel mainPanel = new JPanel();
		mainPanel.setMinimumSize(new Dimension(300, 140));

		//定义面板上的组件
		JLabel usernamelabel = new JLabel("username");
		JLabel pswlabel = new JLabel("password");
		final JTextField usernametext = new JTextField();
		final JPasswordField pswtext = new JPasswordField();

		usernametext.setPreferredSize(new Dimension(120, 20));
		pswtext.setPreferredSize(new Dimension(120, 20));

		final JLabel tiplabel = new JLabel();

		JButton cancelbutton = new JButton("canel");
		JButton loginbutton = new JButton("login");

		cancelbutton.setMaximumSize(new Dimension(80, 20));
		loginbutton.setMaximumSize(new Dimension(80, 20));

		cancelbutton.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent event) {

				System.exit(1);
			}
		});

		loginbutton.addActionListener(new ActionListener() {

			@SuppressWarnings( { "deprecation", "deprecation" })
			public void actionPerformed(ActionEvent event) {

				String username = usernametext.getText();
				String password = new String(pswtext.getPassword());

				Map<String, String> userMap = null;
				Set<String> usernames;
				try {

					if (username.trim() != null && username.equals("root")
							&& password.trim() != null
							&& password.equals("root")) {

						frame.dispose();
						frame.disable();
						String currentDir = "~";
						new CMDLineCopy(username, currentDir);

					} else {
						userMap = userAndpsw.getUserMap();
						usernames = userMap.keySet();

						if (usernames.contains(username)) {

							if (password.trim() != null
									&& password.equals(userMap.get(username))) {

								frame.dispose();
								frame.disable();
								String currentDir = "~";
								new CMDLineCopy(username, currentDir);

							} else {
								tiplabel
										.setText("username or password is Invailed!");
							}
						} else {

							tiplabel
									.setText("username or password is Invailed!");
						}
					}
				} catch (Exception e) {

					e.printStackTrace();
					tiplabel.setText("Something error in loading user");
				}
			}
		});

		mainPanel.setLayout(layout);

		c.fill = GridBagConstraints.NONE;

		c.weightx = 0.0;
		addComponent(mainPanel, usernamelabel, c, layout);

		c.gridwidth = GridBagConstraints.REMAINDER;
		addComponent(mainPanel, usernametext, c, layout);

		c.gridwidth = GridBagConstraints.RELATIVE;
		addComponent(mainPanel, pswlabel, c, layout);

		c.gridwidth = GridBagConstraints.REMAINDER;
		addComponent(mainPanel, pswtext, c, layout);

		addComponent(mainPanel, tiplabel, c, layout);

		c.gridwidth = GridBagConstraints.RELATIVE;
		addComponent(mainPanel, cancelbutton, c, layout);

		c.gridwidth = GridBagConstraints.REMAINDER;
		addComponent(mainPanel, loginbutton, c, layout);

		c.weighty = 1.0;
		c.gridheight = GridBagConstraints.RELATIVE;
		addComponent(basicPanel, logoPanel, c, layout);
		c.gridheight = GridBagConstraints.REMAINDER;
		addComponent(basicPanel, mainPanel, c, layout);

		frame.setResizable(false);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.pack();
		frame.setVisible(true);
	}

	private void addComponent(JPanel panel, Component component,
			GridBagConstraints c, GridBagLayout layout) {

		layout.setConstraints(component, c);
		panel.add(component);

	}
}