java socket 实现SMTP协议 发送邮件

1、java 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 se

3、tContent(String content) 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

4、 void setTo(String to) this.to = to; /* * 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 DataOutp

5、utStream(client.getOutputStream(); String isConnect = response(); if(isConnect.startsWith("220") else System.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

6、 e) System.out.println("读取流失败！"); e.printStackTrace(); boo = false; return boo; /* * 发送smtp指令 * 并返回服务器响应信息 */ private String sendCommand(String msg) String result = null; try os.writeBytes(msg); os.flush(); result = response(); catch (IOException e) e.printStackTrace(); return result; /* *

7、 读取服务器端响应信息 * return */ private String response() String result = null; try result = in.readLine(); catch (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 */ p

8、ublic boolean sendMail() /初始化 if(client=null) if(init() else return false; /判断from,to if(from=null | from.isEmpty() | to = null | to.isEmpty() return false; /进行握手 String result = sendCommand("HELO "+mailServer+lineFeet); if(isStartWith(result,"250") else System.out.println("

9、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 = sendCommand(new String(Base64.encode("*".getBytes()+lineFeet); if(isStartWith(user,"334") else return fals

10、e; 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:<"+from+">"+lineFeet); if(isStartWith(f,"250") else return false; String toStr

11、 = sendCommand("RCPT TO:<"+to+">"+lineFeet); if(isStartWith(toStr,"250") else return false; String data = sendCommand("DATA"+lineFeet); if(isStartWith(data,"354") else return false; StringBuilder sb = new StringBuilder(); sb.append("From:&

12、lt;"+from+">"+lineFeet); sb.append("To:<"+to+">"+lineFeet); sb.append("Subject:test"+lineFeet); sb.append("Date:2010/10/27 17:30"+lineFeet); sb.append("Content-Type:text/plain;charset="GB2312""+lineFeet); sb.append(l

13、ineFeet); sb.append(content); sb.append(lineFeet+"."+lineFeet); String conStr = sendCommand(sb.toString(); if(isStartWith(conStr,"250") else return false; /quit String quit = sendCommand("QUIT"+lineFeet); if(isStartWith(quit,"221") else return false; close();

14、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 is a test

15、mail!"); boolean boo = mail.sendMail(); if(boo) System.out.println("邮件发送成功！"); else System.out.println("邮件发送失败！"); ··························

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17、3;··············SMTP的连接和收发过程：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OK作为响应，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RCPT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的基本命令集：HELO 向服务器标识用户身份MAIL初始化邮

18、件传输mail from: <xxx>RCPT标识单个的邮件接收人；常在MAIL命令后面可有多个rcpt to: <xxx>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 无操作，服务器应响应OKRSET重置会话，当前传输被取消QUIT结束会话POP3简介：在POP3协议中有三种状态，认可状态，处理状态，和更新状态。当客户机与服务器建立联系时，一旦客户机提供了自己身份并成功确认，即由认可状态转入处理状态，在完成相应的操作后客户机发出quit命令，则进入更新状态，更新之后最后重返认可状态。POP3基本命令集：USERus

19、ernamePASSpasswordSTAT 请求服务器发回关于邮箱的统计资料，如邮件总数和总字节数LIST 返回邮件数量和每个邮件的大小RETR Msg#返回由参数标识的邮件的全部文本DELEMsg#服务器将由参数标识的邮件标记为删除，由quit命令执行RSET服务器将重置所有标记为删除的邮件，用于撤消DELE命令NOOP 服务器返回一个肯定的响应QUIT更新class POP3Demo    private static String POP3Server = ""    private static String US

20、ERNAME = "username"/实际应用中改成真实的用户名    private static String PASSWORD = "password"/实际应用中改成真实的密码    public static void main(String args)         int POP3Port = 110;        Socket clie

21、nt = null;        try             / 向POP3服务程序建立一个套接字连接。            client = new Socket(POP3Demo.POP3Server, POP3Port);      &

22、#160;     / 创建一个BufferedReader对象，以便从套接字读取输出。            InputStream is = client.getInputStream();            BufferedReader sockin = new BufferedReader(new InputStreamRea

23、der(is);            / 创建一个PrintWriter对象，以便向套接字写入内容。            OutputStream os = client.getOutputStream();            PrintWriter socko

24、ut = new PrintWriter(os, true);            / 显示同SMTP服务程序的握手过程。            System.out.println("S:" + sockin.readLine();          &#

25、160; sockout.println("user " + POP3Demo.USERNAME);            System.out.println("S:" + sockin.readLine();            sockout.println("pass " + POP3Demo.PASSWOR

26、D);            System.out.println("S:" + sockin.readLine();            sockout.println("stat");            String t

27、emp = sockin.readLine().split(" ");            int count = Integer.parseInt(temp1);/得到信箱中共有多少封邮件            for (int i = 1; i < count + 1; i+) /依次打印出邮件的内容    

28、;            sockout.println("retr " + i);                System.out.println("以下为第" + i + "封邮件的内容");      

29、0;         while (true)                     String reply = sockin.readLine();              

30、0;     System.out.println(reply);                    if (reply.toLowerCase().equals(".")               &#

31、160;         break;                                          

32、;      </xxx></xxx>          catch (IOException e)             System.out.println(e.toString();        finally    

33、0;        try                 if (client != null)                     client.close(); 

34、0;                          catch (IOException e)              class SMTPDemo     /以下三项请在使用时改成真实的信箱地址 

35、60;  /并且注意，SMTPServer和receiver必须是同一个服务器    private static String sender = "sender"    private static String receiver = "receiver"    private static String SMTPServer = "smtpserver"    public static void ma

36、in(String args)         int SMTPPort = 25;        Socket client = null;        try             / 向SMTP服务程序建立一个套接字连接。    

37、        client = new Socket(SMTPDemo.SMTPServer, SMTPPort);            / 创建一个BufferedReader对象，以便从套接字读取输出。            InputStream is = client.getInputStream

38、();            BufferedReader sockin = new BufferedReader(new InputStreamReader(is);            / 创建一个PrintWriter对象，以便向套接字写入内容。          

39、60; OutputStream os = client.getOutputStream();            PrintWriter sockout = new PrintWriter(os, true);            / 显示同SMTP服务程序的握手过程。        

40、0;   System.out.println("S:" + sockin.readLine();            sockout.println("helo");            System.out.println("S:" + sockin.readLine(); 

41、60;          sockout.println("mail from: " + "<" + SMTPDemo.sender + ">");            System.out.println("S:" + sockin.readLine();    

42、        sockout.println("rcpt to: " + "<" + SMTPDemo.receiver + ">");            System.out.println("S:" + sockin.readLine();            sockout.println("data");            /发送邮件标题            sockout.println("subject: 你好");  &