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

public class ReadMail extends JFrame implements ActionListener {
	private String smtphost;   //郵件服務器
	private String username;   //用戶名
	private String password;   //密碼
	
	private JLabel labels[] = new JLabel[3];
	private JTextField textFields[] = new JTextField[3];
	private JTextArea content;
	private JButton get;
	
	private JPanel msgPanel, msgPanel2, messagePanel, buttonPanel;
	
	private static final String labelNames[] = {"Host Address:","User Name:", "PassWord:"};
	
	public ReadMail()
	{
		super("Read Mail");
		
		//獲取內容面板
		Container container = getContentPane();
		
		//創建標簽,文本域
		for(int i = 0; i < labels.length; i++)
		{   
			labels[i] = new JLabel(labelNames[i], JLabel.RIGHT);
			labels[i].setOpaque(true);
			labels[i].setBackground(new Color(200, 255, 255)); //設置標簽背景色
			
			textFields[i] = new JTextField(20);
		}
		//創建密碼域
		textFields[2] = new JPasswordField(20);
		
		content = new JTextArea(30, 30);
		content.setFont(new Font("Serif", Font.PLAIN, 14));
		content.setLineWrap(true);
		content.setWrapStyleWord(true);
		
		//創建按鈕,注冊監聽器
		get= new JButton("Get");
		get.addActionListener(this);
        
        //創建面板
		msgPanel = new JPanel(new GridLayout(3,1));
		msgPanel2 = new JPanel(new GridLayout(3,1));
		msgPanel.setBorder(BorderFactory.createMatteBorder(2,2,2,2,new Color(200,255,255)));
		msgPanel2.setBorder(BorderFactory.createMatteBorder(2,2,2,2,new Color(200,255,255)));
		for(int i = 0; i < labels.length; i++)
		{
			msgPanel.add(labels[i]);
			msgPanel2.add(textFields[i]);
		}
        messagePanel = new JPanel(new BorderLayout());
        messagePanel.setBorder(BorderFactory.createMatteBorder(2,2,2,2,new Color(200,255,255))); 
        buttonPanel = new JPanel();
        
        //往面板里添加組件
        buttonPanel.add(get);
        messagePanel.add(msgPanel, BorderLayout.WEST);
        messagePanel.add(msgPanel2, BorderLayout.CENTER);
   
        container.add(messagePanel, BorderLayout.NORTH);
        container.add(new JScrollPane(content), BorderLayout.CENTER);
        container.add(buttonPanel, BorderLayout.SOUTH);
	}
	
	public static void main(String[] args) 
	{
		ReadMail demo = new ReadMail();
		demo.setSize(400,400);                
		demo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		demo.show();
	}
    //處理按鈕事件
	public void actionPerformed(ActionEvent event)
	{
		if(event.getSource() == get)
		{
			smtphost = textFields[0].getText().trim();
			username = textFields[1].getText().trim();
			password = new String(((JPasswordField)textFields[2]).getPassword());
			getMail();
		}
	}
	
	//接收郵件
	private void getMail()
	{   
		//獲取屬性
		Properties props = new Properties();
		//獲取Session
		Session session = Session.getDefaultInstance(props, null);
		try
		{
			//獲取Store
		    Store store = session.getStore("pop3");
		    store.connect(smtphost, username, password);
		    //獲取文件夾
		    Folder folder = store.getFolder("inbox");
		    folder.open(Folder.READ_ONLY);
		    //獲取目錄 
		    Message message[] = folder.getMessages();
		    for(int i = 0; i < message.length; i++){
		    	content.append((i+1) + ": " + message[i].getFrom()[0] + "\n");
		    	content.append(message[i].getSubject() + "\n");
		    	content.append(message[i].getContent().toString());
		    }
		}
		catch(MessagingException me)
		{
			me.printStackTrace(System.out);
		}
		catch(IOException ie){
			ie.printStackTrace(System.out);
		}
	}
}