Socket2

package com.huawei.xbliuc.socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;


public class POP3Demo
{
    private static String POP3Service = "pop.126.com";
   
    private static String USERNAME = "username";
   
    private static String PASSWORD = "password";
   
    public static void main(String[] args)
    {
        get();
    }
   
    public static void get()
    {
        int POP3Port = 110;
        Socket client = null;
       
        try
        {
            //向POP3服务程序建立一个套接字连接
            client = new Socket(POP3Service, POP3Port);
           
            //创建一个BufferedReader对象，一遍从套接字中读取输出
            InputStream is = client.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
           
            //创建一个PrintWriter对象，以便向套接字中写入内容
            OutputStream os = client.getOutputStream();
            PrintWriter pw = new PrintWriter(os, true);
           
            //显示通SMTP服务程序握手的过程
            System.out.println("S:" + br.readLine());
            System.out.println("UserName:" + POP3Demo.USERNAME);
            System.out.println("S:" + br.readLine());
            System.out.println("PassWord:" + POP3Demo.PASSWORD);
            System.out.println("S:" + br.readLine());
            pw.print("start");
           
            String[] temp = br.readLine().split(" ");
            int count = Integer.parseInt(temp[1]);//得到信箱中有多少封信件
           
            //依次打印邮件的内容
            for (int i = 1; i < count + 1; i++)
            {
                pw.print("retr" + i);
                System.out.println("以下为第" + i + "封邮件的内容");
                while (true)
                {
                    String readLine = br.readLine();
                    System.out.println(readLine);
                    if (readLine.toLowerCase().equals("."))
                    {
                        break;
                    }
                }
            }
        }
        catch (UnknownHostException e)
        {
            e.printStackTrace();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        finally
        {
            if (client != null)
            {
                try
                {
                    client.close();
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                }
            }
        }
    }
}