firstmail.java

这是一个用Java 写成的查看邮件程序

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

public class FirstMail extends JFrame implements ActionListener{
static FirstMail pop;
	JPanel pPanel, radioPanel, rightPanel, upperPanel, lowerPanel, mailcontentPanel, inputPanel, mailPanel, deletePanel;
	JPanel alogoffPanel,connectingPanel;
	JTextField userField, hostField, maincontent, mailnoField;
	JPasswordField passField;
	JRadioButton inputButton, latestButton, viewButton, disconnectButton;
	JButton okButton, logoutButton, mailnoButton, delemailButton;
	JLabel label, userlabel, passlabel, hostlabel, connectlabel, maillabel, disconnectlabel, dslabel;
	JLabel enternolabel, connlabel, connhostlabel, connuserlabel, latestlabel;
	JTextArea textArea;
	ButtonGroup group;
	
	String hostname, username, password;
	int n;
	
	
	public FirstMail(){
		//Create and set up the window.
		setTitle("POP3 Client");
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setSize(800,600);
		setLocation(250,150);
		
        //Create and set up the panel.
        pPanel = new JPanel(new BorderLayout());
        
        addWidgets();
        
        add(pPanel);	
        setVisible(true);
		
	}
	
	public void addWidgets(){
		radioB();
		pPanel.add(radioPanel, BorderLayout.WEST);
				
		rightPanel = new JPanel();
		rightPanel.setLayout(new BorderLayout());
		upperP();
		lowerP();
		rightPanel.add(upperPanel, BorderLayout.NORTH);
		rightPanel.add(lowerPanel, BorderLayout.CENTER);

		pPanel.add(rightPanel, BorderLayout.CENTER);
	}
	
	
	public void upperP(){
		upperPanel = new JPanel();
		upperPanel.setLayout(new BorderLayout());
		upperPanel.setBackground(Color.pink);
		label = new JLabel("Please choose your action.");
		upperPanel.add(label);
	}
	
	public void lowerP(){
		lowerPanel = new JPanel();
		lowerPanel.setLayout(new BorderLayout());
		lowerPanel.setBackground(new Color(255,255,180));
	
	}
	
	protected static ImageIcon createImageIcon(String path) {
        java.net.URL imageURL = FirstMail.class.getResource(path);

        if (imageURL == null) {
            System.err.println("Resource not found: "
                               + path);
            return null;
        } else {
            return new ImageIcon(imageURL);
        }
    }
    
	public void radioB(){
		inputButton = new JRadioButton("Input Information");
		inputButton.setBackground(new Color(100,200,255));
   		
   		viewButton = new JRadioButton("View Email");
   		viewButton.setBackground(new Color(100,200,255));
   		
   		latestButton = new JRadioButton("Latest Email");
   		latestButton.setBackground(new Color(100,200,255));
   		
   		disconnectButton = new JRadioButton("Disconnect");
   		disconnectButton.setBackground(new Color(100,200,255));
   		
   		group = new ButtonGroup();
   		
   		group.add(inputButton);
   		group.add(viewButton);
   		group.add(latestButton);

   		group.add(disconnectButton);
   		
   		inputButton.addActionListener(this);
   		viewButton.addActionListener(this);
   		latestButton.addActionListener(this);
   		disconnectButton.addActionListener(this);
   		
   		ImageIcon images = createImageIcon("mail.jpg");
   		JLabel icon = new JLabel(images);
   		icon.setBorder(BorderFactory.createEmptyBorder(20,20,30,10));
   		
        //Put the radio buttons in a column in a panel.
        radioPanel = new JPanel();
        radioPanel.setPreferredSize(new Dimension(150,500));
        radioPanel.setBackground(new Color(100,200,255));
        radioPanel.setLayout(new BoxLayout(radioPanel, BoxLayout.Y_AXIS));
        radioPanel.add(icon);
   		radioPanel.add(inputButton);
   		radioPanel.add(viewButton);
   		radioPanel.add(latestButton);

   		radioPanel.add(disconnectButton);
		
	}
	
	public void inputP(){
			rightPanel.remove(upperPanel);

			inputPanel = new JPanel();
			inputPanel.setLayout(null);
			
			hostlabel = new JLabel("Hostname: ");
			hostlabel.setBounds(20,5,140,20);
			
			hostField = new JTextField(40);
			hostField.setBounds(100,5,180,20);
			
			userlabel = new JLabel("Username: ");
			userlabel.setBounds(20,32,140,20);
			
			userField = new JTextField(20);
			userField.setBounds(100,32,140,20);

			passField = new JPasswordField(20);
			passField.setBounds(100,60,140,20);
			
			passlabel = new JLabel("Password: ");
			passlabel.setBounds(20,60,140,20);
			
			connectlabel = new JLabel("");
			connectlabel.setBounds(300,5,140,20);
			
			okButton = new JButton("Connect");
			okButton.setBounds(30,90,90,20);
			okButton.addActionListener(this);
			
			inputPanel.add(hostlabel);
			inputPanel.add(userlabel);
			inputPanel.add(passlabel);
			inputPanel.add(hostField);
			inputPanel.add(userField);
			inputPanel.add(passField);
			inputPanel.add(okButton);
			inputPanel.add(connectlabel);
			
			inputPanel.setPreferredSize(new Dimension(150,120));
			upperPanel = inputPanel;
			rightPanel.add(upperPanel, BorderLayout.NORTH);
			this.show();
	}
	
	public void connectingP(){
		rightPanel.remove(upperPanel);
		
		connectingPanel = new JPanel();
		connectingPanel.setLayout(null);
		
		connlabel = new JLabel("<html><font color=grey size=5>You are currently connecting to a POP server...</font></html>");
		connlabel.setBounds(20,10,500,40);
		
		connhostlabel = new JLabel("Host: " + hostname);
		connhostlabel.setBounds(20,50,200,20);
		
		connuserlabel = new JLabel("Username: " + username);
		connuserlabel.setBounds(20,70,200,20);
		
		connectingPanel.add(connlabel);
		connectingPanel.add(connhostlabel);
		connectingPanel.add(connuserlabel);
		
		connectingPanel.setPreferredSize(new Dimension(150,120));
		upperPanel = connectingPanel;
		rightPanel.add(upperPanel, BorderLayout.NORTH);
		this.show();

	}
		
	public void viewP(){
		rightPanel.remove(upperPanel);
		
		mailPanel = new JPanel();
		mailPanel.setLayout(null);
		if (Mail1.con == true){
			n = Mail1.stat();
			maillabel = new JLabel("<html><b><u><font color=blue size=4>Inbox: " + n + " messages (Please click here to view)</font></u></b></html>");
			maillabel.addMouseListener(new MouseAdapter(){
			public void mouseClicked(MouseEvent me)
				{
					mailcontentP();
				}			
			});
		}else{
			 maillabel = new JLabel("<html><b><u><font color=red size= 5>You have not logged in!!!</font></u></b></html>");
		}
	
		maillabel.setBounds(20,32,350,40);


		mailPanel.add(maillabel);
		mailPanel.setPreferredSize(new Dimension(150,120));
		upperPanel = mailPanel;
		rightPanel.add(upperPanel, BorderLayout.NORTH);
		this.show();
	}
	
	public void deleteP(){
		rightPanel.remove(upperPanel);
		deletePanel = new JPanel();
		deletePanel.setLayout(null);
		
		disconnectlabel = new JLabel("Are you sure you want to logout?");
		disconnectlabel.setBounds(20,32,200,20);
	
		logoutButton = new JButton("disconnect");
		logoutButton.setBounds(40,70,120,20);
		logoutButton.addActionListener(this);
		
		dslabel = new JLabel("");
		dslabel.setBounds(120,70,120,20);
		
		deletePanel.add(disconnectlabel);
		deletePanel.add(logoutButton);
		deletePanel.add(dslabel);
		
		deletePanel.setPreferredSize(new Dimension(150,120));
		upperPanel = deletePanel;
		rightPanel.add(upperPanel, BorderLayout.NORTH);
		this.show();
		
		
	}
	
	public void mailcontentP(){
		rightPanel.remove(lowerPanel);
		mailcontentPanel = new JPanel();
		mailcontentPanel.setLayout(null);
		mailcontentPanel.setBackground(new Color(255,255,180));
		
		enternolabel = new JLabel("Enter email no: ");
		enternolabel.setBounds(20,32,200,20);
		
		mailnoField = new JTextField(5);
		mailnoField.setBounds(150,32,200,20);
		
		mailnoButton = new JButton("View");
		mailnoButton.setBounds(400,32,100,20);
		mailnoButton.addActionListener(this);
		
		delemailButton = new JButton("Delete");
		delemailButton.setBounds(500, 32, 100, 20);
		delemailButton.addActionListener(this);
		
		textArea = new JTextArea("");
        textArea.setFont(new Font("Serif", Font.ITALIC, 16));
        textArea.setLineWrap(true);
        textArea.setWrapStyleWord(true);
        JScrollPane areaScrollPane = new JScrollPane(textArea);
        areaScrollPane.setVerticalScrollBarPolicy(
                        JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        areaScrollPane.setPreferredSize(new Dimension(250, 250));
        areaScrollPane.setBorder(
            BorderFactory.createCompoundBorder(
                BorderFactory.createCompoundBorder(
                                BorderFactory.createTitledBorder("Email Content"),
                                BorderFactory.createEmptyBorder(5,5,5,5)),
                areaScrollPane.getBorder()));

	    areaScrollPane.setLocation(50,80);
		areaScrollPane.setSize(550,350);
		
		mailcontentPanel.add(enternolabel);
		mailcontentPanel.add(mailnoField);
		mailcontentPanel.add(mailnoButton);
		mailcontentPanel.add(delemailButton);
		mailcontentPanel.add(areaScrollPane);
		lowerPanel = mailcontentPanel;
		
		rightPanel.add(lowerPanel, BorderLayout.CENTER);
		this.show();	
	}
	
	public void alogoffP(){
		rightPanel.remove(upperPanel);
		rightPanel.remove(lowerPanel);
		lowerP();
		alogoffPanel = new JPanel();
		alogoffPanel.setLayout(null);
		maillabel = new JLabel("<html><b><u><font color=red size= 5>You have not logged in!!!</font></u></b></html>");
		maillabel.setBounds(20,32,400,40);	
		
		alogoffPanel.add(maillabel);
		alogoffPanel.setPreferredSize(new Dimension(150,120));
		upperPanel = alogoffPanel;
		rightPanel.add(upperPanel, BorderLayout.NORTH);
		rightPanel.add(lowerPanel, BorderLayout.CENTER);
		this.show();	
	}
	
	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == inputButton){
			if (Mail1.con == false)
				inputP();
			else connectingP();
			
		}else if (e.getSource() == viewButton){
			System.out.println("good");
			viewP();

			
		}else if (e.getSource() == okButton){
			hostname = hostField.getText();
			username = userField.getText();
			password = new String(passField.getPassword());
			Mail1.connect(hostname, username, password, connectlabel, pop);
			if (Mail1.con == true)
				connectingP();
			
		}else if (e.getSource() == disconnectButton){
			if (Mail1.con == true)
				deleteP();	
			else alogoffP();
			
		}else if (e.getSource() == logoutButton){
			Mail1.disconnect();
			alogoffP();
			maillabel.setText("<html><b><u><font color=red size= 5>You have already logoff!!!</font></u></b></html>");
					
		}else if (e.getSource() == mailnoButton){
			boolean check = Mail1.viewm(mailnoField.getText());
			textArea.setText(Mail1.sb.toString());
		
		}else if (e.getSource() == delemailButton){
			boolean check2 = Mail1.delem(mailnoField.getText());
			textArea.setText(Mail1.sb.toString());
			
			
		}else if (e.getSource() == latestButton){
			viewP();
			if (Mail1.con == true){
				maillabel.setText("<html><b><u><font color=blue size=4>Latest Email</font></u></b></html>");
							mailcontentP();
							mailnoField.setText("" + n);
							boolean check = Mail1.viewm("" + n);
							textArea.setText(Mail1.sb.toString());

				maillabel.addMouseListener(new MouseAdapter(){
					public void mouseClicked(MouseEvent me)
						{
							mailcontentP();
							mailnoField.setText("" + n);
							boolean check = Mail1.viewm("" + n);
							textArea.setText(Mail1.sb.toString());
						}			
				});
			this.show();
			}
		}
    }
	
	public static void createAndShowGUI(){
				pop = new FirstMail();
	}
	
	public static void main(String args[]){
		  JFrame.setDefaultLookAndFeelDecorated(true);
		   javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });	  
	}
}