基于POP3的JAVA邮件接收程序!.doc

基于POP3的JAVA邮件接收程序！（与上次的发送程序配套） 收藏 有发送有接收才显得完整一点。同样分两部分写：一：POP3命令介绍（抄的）；二：实例。一：POP3命令介绍telnet 12 110 - 使用 telnet 命令连接服务器 110 端口 Trying 12. - 正在连接服务器 110 端口 Connected to 12. - 连接服务器 110 端口成功 +OK Winmail Mail Server POP3 ready user username - 输入用户名, username 为具体的用户名 +OK - 执行命令成功pass password - 输入用户密码，password 为具体的密码+OK 2 messages - 密码认证通过 (-ERR authorization failed - 密码认证失败) stat - 邮箱状态 +OK 2 6415 - 2 为该信箱总邮件数，6415 为总字节数 list - 列出每封邮件的字节数 +OK - 执行命令成功，开始显示，左边为邮件的序号，右边为该邮件的大小 1 537 - 第 1 封邮件，大小为 537 字节 2 5878 - 第 2 封邮件，大小为 5878 字节 .top 1 - 接收第 1 封邮件 +OK - 接收成功, 返回第 1 封邮件头Return-Path: Delivered-To: Received: (winmail server invoked for smtp delivery); Mon, 25 Oct 2004 14:24:27 +0800From: To: Date: Mon, 25 Oct 2004 14:24:27 +0800Subject: test mail . retr 1 - 接收第 1 封邮件 +OK - 接收成功, 返回第 1 封邮件全部内容Return-Path: Delivered-To: Received: (winmail server invoked for smtp delivery); Mon, 25 Oct 2004 14:24:27 +0800 From: To: Date: Mon, 25 Oct 2004 14:24:27 +0800Subject: test mail Hi, test2 This is a test mail, you dont reply it. . dele 1 - 删除第 1 封邮件 +OK - 删除成功 dele 2 - 删除第 2 封邮件 +OK - 删除成功 quit - 结束会话 +OK - 执行命令成功二：发送邮件实例 package mail;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import .Socket;import .UnknownHostException;import java.util.StringTokenizer;public class POP3Client private Socket socket; private boolean debug=true; public static void main(String args) throws UnknownHostException, IOException String server=;/POP3服务器地址 String user=wasingmon;/用户名 String password=;/密码 POP3Client pop3Client=new POP3Client(server,110); pop3Client.recieveMail(user,password); public POP3Client(String server,int port) throws UnknownHostException, IOException try socket=new Socket(server,port); catch(Exception e) e.printStackTrace(); finally System.out.println(建立连接！); /得到服务器返回的一行命令 public String getReturn(BufferedReader in) String line=; try line=in.readLine(); if(debug) System.out.println(服务器返回状态:+line); catch(Exception e) e.printStackTrace(); return line; /从返回的命令中得到第一个字段,也就是服务器的返回状态码(+OK或者-ERR) public String getResult(String line) StringTokenizer st=new StringTokenizer(line, ); return st.nextToken(); /发送命令 private String sendServer(String str,BufferedReader in,BufferedWriter out) throws IOException out.write(str); out.newLine(); out.flush(); if(debug) System.out.println(已发送命令:+str); return getReturn(in); /user命令 public void user(String user,BufferedReader in,BufferedWriter out) throws IOException String result; result=getResult(getReturn(in); if(!+OK.equals(result) throw new IOException(连接服务器失败!); result=getResult(sendServer(user +user,in,out); if(!+OK.equals(result) throw new IOException(用户名错误!); /pass命令 public void pass(String password,BufferedReader in,BufferedWriter out) throws IOException String result; result=getResult(sendServer(pass +password,in,out); if(!+OK.equals(result) throw new IOException(密码错误!); /stat命令 public int stat(BufferedReader in,BufferedWriter out) throws IOException String result; String line; int mailNum; line=sendServer(stat,in,out); StringTokenizer st=new StringTokenizer(line, ); result=st.nextToken(); if(st.hasMoreTokens() mailNum=Integer.parseInt(st.nextToken(); else mailNum=0; if(!+OK.equals(result) throw new IOException(查看邮箱状态出错!); System.out.println(共有邮件+mailNum+封); return mailNum; /得到邮件详细信息 public String getMessagedetail(BufferedReader in) String message=; String line; try line=in.readLine(); while(!.equalsIgnoreCase(line) message=message+line+n; line=in.readLine(); catch(Exception e) e.printStackTrace(); return message; /retr命令 public void retr(int mailNum,BufferedReader in,BufferedWriter out) throws IOException String result; for(int i=1;i=mailNum;i+) result=getResult(sendServer(retr +i,in,out); if(!+OK.equals(result) throw new IOException(接收邮件出错!); System.out.println(第+i+封); System.out.println(getMessagedetail(in); /退出 public void quit(BufferedReader in,BufferedWriter out) throws IOException String result; result=getResult(sendServer(QUIT,in,out); if(!+OK.equals(result) throw new IOException(未能正确退出); /接收邮件程序 public boolean recieveMail(String user,String password) try BufferedReader in=new BufferedReader(new InputStreamReader(socket.getInputStream(); BufferedWriter out=new BufferedWrit