getmail.java

java应用开发详解

import java.util.*;
import java.io.*;
import javax.mail.*;
import javax.mail.event.*;
import javax.activation.*;

public class GetMail 
{

    public static void main(String argv[])
    {
	String host = "localhost";
	String user = "mellon";
	String password = "1234";
	String mbox = "inbox";

        try         
        {
	    	//初始化session
	    	Properties props = System.getProperties();
	    	Session session = Session.getDefaultInstance(props, null);
	   
	    	//创建与邮件服务器的连接
	    	Store store = session.getStore("POP3");
	    	store.connect(host, user, password);

	    	//得到信夹
	    	Folder folder = store.getFolder(mbox);
	    	if (folder == null || !folder.exists()) 
	    	{
			System.out.println("Invalid folder");
			System.exit(1);
	    	}

	    	//打开信夹
	    	folder.open(Folder.READ_WRITE);

            	//得到信件
            	Message[] msgs = folder.getMessages();
            	
            	//输入信件数
	    	System.out.println("Got " + msgs.length + " new messages");

		   
		//循环打出信件
		for (int i = 0; i < msgs.length; i++) 
		{
			
			try 
			{
			    //得到信件数据流
			    DataHandler dh = msgs[i].getDataHandler();
			    InputStream is = dh.getInputStream();
			    
			    //打印数据流
			    int c;
			    while ((c = is.read()) != -1)
			 	System.out.write(c); 
			}
			catch (IOException ioex) 
			{ 
			    ioex.printStackTrace();	
			} 
			catch (MessagingException mex) 
			{
			    mex.printStackTrace();
			}
		}
	    

	} 
	catch (Exception ex) 
	{
	    ex.printStackTrace();
	}
    }
}