usefiltrate.java

带有过滤功能的邮件客户端的实现的java简单实现

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

public class useFiltrate
{
  	public static void main(String[] args) 
  	{    
    		if (args.length == 0) 
    		{
      			System.err.println(
       			"Usage: java SearchClient protocol://username@host/foldername");
      			return; 
    		}
    		//新建URLName对象
    		URLName server = new URLName(args[0]);

    		try 
    		{
      			Session session = Session.getDefaultInstance(new Properties(), 
       			new MailAuthenticator(server.getUsername()));

      			// 连接邮件服务器，打开文件夹
      			Folder folder = session.getFolder(server);
      			if (folder == null) 
      			{
        			System.out.println("Folder " + server.getFile() + " not found.");
        			System.exit(1);
      			}  
      			folder.open(Folder.READ_ONLY);
      
      			SearchTerm term = null;
      			if (args.length > 1) 
      			{
        			SearchTerm[] terms = new SearchTerm[args.length-1];
        			for (int i = 1; i < args.length; i++) 
        			{
          				Address a = new InternetAddress(args[i]);
          				terms[i-1] = new FromTerm(new InternetAddress(args[i]));
        			}
        			if (terms.length > 1) term = new OrTerm(terms);
        			else term = terms[0];
      			}
      
      			// 从URLName中获取信息
      			Message[] messages;
      			if (term == null)  
      			{
        			messages = folder.getMessages();
      			}
      			else 
      			{
        			messages = folder.search(term);
      			}
      			for (int i = 0; i < messages.length; i++) 
      			{
        			System.out.println("------------ Message " + (i+1)+ " ------------");
         
        			// 打印信息头
        			Enumeration headers = messages[i].getAllHeaders();
        			while (headers.hasMoreElements()) 
        			{
          				Header h = (Header) headers.nextElement();
          				System.out.println(h.getName() + ": " + h.getValue());
        			}       
        			System.out.println();
        
        			// 主体部分
        			Object body = messages[i].getContent();
        			if (body instanceof Multipart) 
        			{
          				processMultipart((Multipart) body);          
        			}
        			else 
        			{ 
        				// 常见信息
          				processPart(messages[i]);
        			}
        
        			System.out.println();
        
      			} 

      			// 关闭连接
      			folder.close(false);      
    		} 
    		catch (Exception e) 
    		{
      			e.printStackTrace();
    		}  
          
    		// 退出系统
    		System.exit(0);    
  	}  
  	//多部分处理
  	public static void processMultipart(Multipart mp) 
   	throws MessagingException 
   	{
    		for (int i = 0; i < mp.getCount(); i++) 
    		{
      			processPart(mp.getBodyPart(i));
    		}    
  	}
	//单独部分处理
  	public static void processPart(Part p) 
  	{    
    		try 
    		{
      			String fileName = p.getFileName();
      			if (fileName == null) 
      			{ 
      				// 内嵌
        			p.writeTo(System.out);
      			}
      			else if (fileName != null) 
      			{
        			File f = new File(fileName);
        			// 发现不存在的信息
        			for (int i = 1; f.exists(); i++) 
        			{
          				String newName = fileName + " " + i;
          				f = new File(newName);
        			}
        			FileOutputStream out = new FileOutputStream(f);        
        			//缓存输入流
        			InputStream in = new BufferedInputStream(p.getInputStream());
        			int b;
        			while ((b = in.read()) != -1) out.write(b); 
        			//更新缓存
        			out.flush();
        			out.close();
        			in.close();
      			}
    		}    
    		catch (Exception e) 
    		{
      			System.err.println(e);
      			e.printStackTrace();
    		}    
  	}
}

class MailAuthenticator extends Authenticator 
{
	//属性
  	private JDialog passwordDialog = new JDialog(new JFrame(), true);  
  	private JLabel mainLabel = new JLabel(
   	"输入用户名和密码: ");
  	private JLabel userLabel = new JLabel("用户名: ");
  	private JLabel passwordLabel = new JLabel("密码: ");
  	private JTextField usernameField = new JTextField(20);
  	private JPasswordField passwordField = new JPasswordField(20);
  	private JButton okButton = new JButton("确定");
  	//构造器
  	public MailAuthenticator() 
  	{
    		this("");
  	}
    	//带String参数的构造器
  	public MailAuthenticator(String username) 
  	{
  		//容器    
    		Container pane = passwordDialog.getContentPane();
    		//设置布局
    		pane.setLayout(new GridLayout(4, 1));
    		//添加标签
    		pane.add(mainLabel);
    		//添加面板
    		JPanel p2 = new JPanel();
    		p2.add(userLabel);
    		p2.add(usernameField);
    		//设置文本内容
    		usernameField.setText(username);
    		pane.add(p2);
    		JPanel p3 = new JPanel();
    		p3.add(passwordLabel);
    		p3.add(passwordField);
    		pane.add(p3);
    		JPanel p4 = new JPanel();
    		//添加按钮
    		p4.add(okButton);
    		pane.add(p4);   
    		passwordDialog.pack();
    
    		ActionListener al = new HideDialog();
    		//监听按钮动作
    		okButton.addActionListener(al);
    		usernameField.addActionListener(al);
    		passwordField.addActionListener(al);    
  	}
  	//HideDialog类
  	class HideDialog implements ActionListener 
  	{  
    		public void actionPerformed(ActionEvent e) 
    		{
    			//隐藏对话框
      			passwordDialog.hide();
    		}    
  	}

  	public PasswordAuthentication getPasswordAuthentication() 
  	{    
  		//显示对话框
    		passwordDialog.show();
    
    		// getPassword() 返回字符串    		
    		String password = new String(passwordField.getPassword());
    		String username = usernameField.getText();
    		//清除password    		
    		passwordField.setText("");
    		//返回
    		return new PasswordAuthentication(username, password);    
    	}
}