import java.io.*;     
import java.net.*;     
import java.util.*;   
    
  public class mypop3{        
     public static void main(String[]args)throws IOException,UnknownHostException{     
     String mailHost;     
     mailHost="pop3.163.com";     
     POP3Connection mail =new POP3Connection(mailHost);     
     mail.Receive();   
     }      
  }     
    
  class POP3Connection     
  {     
    final static int PORT=110;     
    static InetAddress r_ip;     
    public POP3Connection(String host)throws UnknownHostException{     
        r_ip=InetAddress.getByName(host);     
     }     
    
    public boolean Receive()throws IOException     
    {     
  //   Create   Socket     
    BufferedReader in,msg;     
    DataOutputStream out;     
    Socket sock;     
    String result,line,pass,name;        
    if((sock=new Socket(r_ip,PORT))==null)     
      return false;     
      in=new BufferedReader(new InputStreamReader(sock.getInputStream()));     
      out=new DataOutputStream(sock.getOutputStream());      
      result=in.readLine();     
      System.out.println(result);      
      out.writeBytes("HELO"+"bootcool"+"\n");   
      System.out.println("HELO"+r_ip.getHostAddress()+"\n");     
      
      result=in.readLine();     
      System.out.println(result);     
      System.out.println("**********");   
      
      out.writeBytes("USER"+"bootcool"+"\n");     
      result=in.readLine();     
      System.out.println(result);     
      
      out.writeBytes("PASS"+"bootcool"+"\n");     
      result=in.readLine();     
      System.out.println(result);     
    
      out.writeBytes("STAT1"+"\n");     
      
      out.writeBytes("LIST1"+"\n");     
      result=in.readLine();   
      System.out.println(result);     
      
      out.writeBytes("UIDL1   "+"\n");   
      result=in.readLine();   
      System.out.println(result);   
    
      out.writeBytes("RETR1");   
      result=in.readLine();   
      System.out.println(result+"\n");   
 
    //out.writeBytes("TOP   1"+"\n");   
    //result   =   in.readLine();   
    //System.out.println(result);   
    
  //out.writeBytes("DELE   1"+"\n");     
    //result   =   in.readLine();     
  //System.out.println(result);     
      
    out.writeBytes("QUIT"+"\n");     
    System.out.println("QUIT");     
    result=in.readLine();     
    System.out.println(result);     
        
    sock.close();     
    
    return true;     
    }     
  }