import?Java.net.*;
import?Java.io.*;
import?Java.util.*;

public?class?SMTPSender{	//定義一個郵件發(fā)送類

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（）;	//可以保存多個收信人郵件地址的向量

public?static?void?main（String[]?args）{
SMTPSender?smtp=new?SMTPSender（）;
smtp.setMailServer（“smtp.xxx.com“）;	//設(shè)置電子郵件服務(wù)器地址為smtp.xxx.com
smtp.setMailFrom（“xxx@xxx.com““xxx““???“）;		//設(shè)置發(fā)信人地址為xxx@xxx.com，用戶名為xxx，口令為???
smtp.addMailTo（“yyy@yyy.com“）;			//設(shè)置收信人地址為yyy@yyy.com
if（smtp.send（“hello““這是一個測試!“））{?		//發(fā)送郵件主題和正文
System.out.println（“郵件發(fā)送成功！“）;
}else?System.out.println（“郵件發(fā)送失敗！“）;
}

public?void?setMailServer（String?s）{
smtpServer=s;
}

public?void?setMailFrom（String?sString?uidString?pwd）{
this.from=s;
this.user=uid;
this.pass=pwd;
this.isNeedAuthLogin=（this.user!=null&&this.pass!=null&&!this.user.equals（““）&&!this.pass.equals（““））;		//用戶名和口令不為空則采用驗證發(fā)信人的方式
}

public?boolean?addMailTo（String?mailAddr）{
to.addElement（mailAddr）;
return?true;
}

//郵件發(fā)送函數(shù)
public?boolean?send（String?subjectString?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（smtpServer25）;
outData=new?PrintWriter（socket.getOutputStream（））;
inData=new?BufferedReader（new?InputStreamReader（socket.getInputStream（）））;

readResponse（“220“）;		//與郵件服務(wù)器連接成功

sendRequest（“HELO?“+smtpServer+LINEFEED）;?		//發(fā)送HELO命令
readResponse（“250“）;

if（isNeedAuthLogin）{		//驗證發(fā)信人的流程
//AUTH?LOGIN
sendRequest（“AUTH?LOGIN“+LINEFEED）;
readResponse（“334“）;
sendRequest（new?String（base64.encodeString（user））+LINEFEED）;??//以base64編碼的形式發(fā)送發(fā)信人的用戶名
readResponse（“334“）;

sendRequest（new?Str