javasocket实现SMTP协议发送邮件

1、1 / 9java socket 实现 SMTP 协议发送邮件 文章分类:Java 编程package com.socket.test;import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStreamReader;import .Socket;import .UnknownHostException;import ernal.impl.dv.util.Base64; /*

2、通过 socket 向 smtp 协议服务器发送邮件* author fuyanqing*/public class SocketMail String mailServer;String from;String to;String content;String lineFeet = rn;private int port = 25;Socket client;BufferedReader in;DataOutputStream os;public String getContent() return content;public void setContent(String content)

3、 this.content = content;public String getMailServer() return mailServer;public void setMailServer(String mailServer) this.mailServer = mailServer;public String getFrom() return from;public void setFrom(String from) this.from = from;public String getTo() return to;public void setTo(String to) this.to

4、 = to;/*2 / 9* 初始化连接* return*/private boolean init() boolean boo = true;if(mailServer=null | .equals(mailServer)return false;try client = new Socket(mailServer,port);in = new BufferedReader(new InputStreamReader(client.getInputStream();os = new DataOutputStream(client.getOutputStream();String isConn

5、ect = response(); if(isConnect.startsWith(220)elseSystem.out.println( 建立连接失败： +isConnect);boo = false; catch (UnknownHostException e) System.out.println( 建立连接失败！ );e.printStackTrace();boo = false; catch (IOException e) System.out.println( 读取流失败！ ); e.printStackTrace();boo = false;return boo;/* 发送 sm

6、tp 指令* 并返回服务器响应信息3 / 9*/private String sendCommand(String msg) String result = null;try os.writeBytes(msg); os.flush();result = response(); catch (IOException e) e.printStackTrace();return result;/* 读取服务器端响应信息* return*/private String response()String result = null;try result = in.readLine(); catch (

7、IOException e) e.printStackTrace();return result;/* 关闭*/ private void close() try os.close(); in.close();client.close(); catch (IOException e) e.printStackTrace(); /* 发送邮件* return*/ public boolean sendMail()/ 初始化if(client=null)if(init() else return false;/ 判断 from,toif(from=null | from.isEmpty() | t

8、o = null | to.isEmpty() return false;/ 进行握手String result = sendCommand(HELO +mailServer+lineFeet);if(isStartWith(result,250)elseSystem.out.println( 握手失败： +result); return false;/ 验证发信人信息String auth = sendCommand(AUTH LOGIN+lineFeet); if(isStartWith(auth,334)else return false;String user = sendComman

9、d(new String(Base64.encode(*.getBytes()+lineFeet);if(isStartWith(user,334)4 / 9else return false;String pass = sendCommand(new String(Base64.encode(*.getBytes()+lineFeet);if(isStartWith(pass,235)else return false;/ 发送指令String f = sendCommand(Mail From:+lineFeet); if(isStartWith(f,250)elsereturn fals

10、e;String toStr = sendCommand(RCPT TO:+lineFeet);if(isStartWith(toStr,250)5 / 9elsereturn false;String data = sendCommand(DATA+lineFeet); if(isStartWith(data,354)elsereturn false;StringBuilder sb = new StringBuilder(); sb.append(From:+lineFeet);sb.append(To:+lineFeet); sb.append(Subject:test+lineFeet

11、); sb.append(Date:2010/10/27 17:30+lineFeet); sb.append(Content-Type:text/plain;charset=GB2312+lineFeet);sb.append(lineFeet);sb.append(content); sb.append(lineFeet+.+lineFeet);String conStr = sendCommand(sb.toString(); if(isStartWith(conStr,250)elsereturn false;/quitString quit = sendCommand(QUIT+li

12、neFeet); if(isStartWith(quit,221)elsereturn false;close();return true;private boolean isStartWith(String res,String with)return res.startsWith(with);public static void main(String args) SocketMail mail = new SocketMail();mail.setMailServer(); mail.setFrom(*); mail.setTo(*);mail.setContent(hello,this

13、 is a test mail!);boolean boo = mail.sendMail(); if(boo)System.out.println( 邮件发送成功！ ); elseSystem.out.println( 邮件发送失败！ );SMT 啲连接和收发过程：a. 建立 TCP 连接。b. 客户端发送 HELO 命令以标识发件人自己的身份，然后客户端发送 MAIL 命令服 务器端正希望以 OKf 乍为响应，表明准备接收。c. 客户端发送 RCPT 命令，以标识该电子邮件的计划接收人，可以有多个RCPT6 / 9行d. 协商结束，发送邮件，用命令 DATA 发送e. 以 . 表示结束输入内容一起发送出去f. 结束此次发送，用 QUIT 命令退出。SMTP 勺基本命令集：HELO 向服务器标识用户身份MAIL 初始化邮件传输 mail from: RCPT标识单个的邮件接收人；常在 MAIL 命令后面可有多个 rcpt to: DATA在单个或多个 RCPT 命令后，表示所有的邮件接收人已标识，初始化数据传输，以 . 结束。NOOP 无操乍，服务器应响应 OKRSET重置会话，当前传