java開發的郵件發送程序

Java的網絡功能非常強大，開發和使用也非常簡單，難怪microsoft極力要爭回程序語言的霸主地位。筆者根據smtp協議使用Java Socket寫了一個發送郵件的程序，將此與各位分享。

實現的原理非常簡單，首先建立和郵件服務器的Socket連接，然後進行和服務器握手，然後發送smtp指令，並封裝郵件體，然後發送即可。大家不妨一試。由什麼問題可以和我聯系：Email:[email protected];Homepage:http://www.ehawa.com。

import Java.Net.*;

import Java.io.*;

import Java.util.*;

public class SMTPSender{

Socket socket=null;

PrintWriter outData=null;

BufferedReader inData=null;

String smtpServer="";

String user="";

String pass="";

String from="";

String LINEFEED="\r\n";

boolean isNeedAuthLogin=false;

Vector to=new Vector();

public static void main(String[] args){

SMTPSender smtp=new SMTPSender();

smtp.setMailServer("mail.ehawa.com");

smtp.setMailFrom("[email protected]","???","???");

smtp.addMailTo("[email protected]");

if(smtp.send("hello","這是一個測試!")){

System.out.println("郵件發送成功！");

}else System.out.println("郵件發送失敗！");

}

public void setMailServer(String s){

smtpServer=s;

}

public void setMailFrom(String s,String uid,String pwd){

this.from=s;

this.user=uid;

this.pass=pwd;

this.isNeedAuthLogin=(this.user!=null&&this.pass!=null&&!this.user.equals("")&&!this.pass.equals(""));

}

public boolean addMailTo(String mailAddr){

to.addElement(mailAddr);

return true;

}

public boolean send(String subject,String content){

try{

if(smtpServer==null||smtpServer.equals(""))return false;

if(from==null||from.equals(""))return false;

if(to.size()<1)return false;

socket=new Socket(smtpServer,25);

outData=new PrintWriter(socket.getOutputStream());

inData=new BufferedReader(new InputStreamReader(socket.getInputStream()));

//與郵件服務器連接成功

readResponse("220");

//HELO host

sendRequest("HELO "+smtpServer+LINEFEED);

readResponse("250");

if(isNeedAuthLogin){

//AUTH LOGIN

sendRequest("AUTH LOGIN"+LINEFEED);

readResponse("334");

//USERNAME:

sendRequest(new String(Base64.encodeString(user))+LINEFEED);

readResponse("334");

//PASSWord:

sendRequest(new String(Base64.encodeString(pass))+LINEFEED);

readResponse("235");

}

//MAIL FROM:

sendRequest("MAIL FROM:"+LINEFEED);

readResponse("250");

//RCPT TO:

for(Enumeration enu=to.elements();enu.hasMoreElements();){

String to1=(String)enu.nextElement();

sendRequest("RCPT To:"+LINEFEED);

readResponse("250");

}

//DATA

sendRequest("DATA"+LINEFEED);

readResponse("354");

//郵件內容

StringBuffer s1=new StringBuffer("From: "+LINEFEED);

s1.append("To: "+LINEFEED);

s1.append("Subject: "+subject+LINEFEED);

s1.append("Date: "+new Java.util.Date().toLocaleString()+LINEFEED);

s1.append("Content-Type: text/plain;charset=\"GB2312\""+LINEFEED);

s1.append(LINEFEED);

s1.append(content);

s1.append(LINEFEED+"."+LINEFEED);//發送

sendRequest(s1.toString());

readResponse("250");

//QUIT退出

sendRequest("QUIT"+LINEFEED);

readResponse("221");

try{

inData.close();

inData=null;

}catch(Exception ex){}

try{

outData.close();

outData=null;

}catch(Exception ex){}

try{

socket.close();

socket=null;

}catch(Exception ex){}

}catch(Exception e){

return false;

//e.printStackTrace();

}

return true;

}

private void readResponse(String cmd)throws Exception{

String tmp=inData.readLine();

if(tmp.startsWith(cmd));//System.out.println(" [S:]"+tmp);

else throw new Exception("##########郵件發送失敗!##########"+tmp);

while(tmp.startsWith(cmd+"-"))tmp=inData.readLine();

}

private void sendRequest(String msg){

//System.out.print("***[C:]"+msg);

outData.write(msg);

outData.flush();

}

public void close(){

try{

inData.close();

inData=null;

}catch(Exception ex){}

try{

outData.close();

outData=null;

}catch(Exception ex){}

try{

socket.close();

socket=null;

}catch(Exception ex){}

}

}