smtpsenderdemo.java

java经典10例子

import java.net.*;
import java.io.*;
import java.util.*;

public class SMTPSenderDemo{
	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){
		SMTPSenderDemo smtp=new SMTPSenderDemo();
		smtp.setMailServer("mail.sohu.com");
		smtp.setMailFrom("[e-mail]","user","pwd");
		smtp.addMailTo("[e-mail]");
		if(smtp.send("hello","这是一个测试!")){
			System.out.println("邮件发送成功!"); 
		}else 
			System.out.println("邮件发送失败!"); 
	}
	
	//设置邮件服务器
	public void setMailServer(String s){
		smtpServer=s;
	}
	
	//封装用户和密码
	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;
	}
	
	//发送邮件，发送成功返回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()));
			//与邮件连接成功
			readResponse("220");
			//HELO host
			sendRequest("HELO "+smtpServer+LINEFEED);
			readResponse("250");
			if(isNeedAuthLogin){
				//AUTH LOGIN
				sendRequest("AUTH LOGIN"+LINEFEED);
				readResponse("334");
				//USERNAME:
				sendRequest(new String(user)
					+LINEFEED);
				readResponse("334");
				//PASSWORD:
				sendRequest(new String(pass)+LINEFEED);
				readResponse("235");
			}
			//MAIL FROM:<..>
			sendRequest("MAIL FROM:<"+from+">"+LINEFEED);
			readResponse("250");
			//RCPT TO:<..>
			for(Enumeration enu=to.elements();enu.hasMoreElements();){
				String to1=(String)enu.nextElement();
				sendRequest("RCPT To:<"+to1+">"+LINEFEED);
				readResponse("250");
			}
			//DATA
			sendRequest("DATA"+LINEFEED);
			readResponse("354");
			//邮件内容
			StringBuffer s1=new StringBuffer(
				"From: <"+from+">"+LINEFEED);
			s1.append("To: <"+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);
			//发送邮件
			sendRequest(s1.toString());
			readResponse("250");
			//QUIT退出
			sendRequest("QUIT"+LINEFEED);
			readResponse("221");
			try{
				inData.close();
				inData=null;
				outData.close();
				outData=null;
				socket.close();
				socket=null;
			}catch(Exception ex){}
		}catch(Exception e){
			return false;
			//e.printStackTrace();
		}
		return true;
	}
	
	//解析从邮件服务器发送回来的响应码
	private void readResponse(String cmd)throws Exception{
		String tmp=inData.readLine();
		if(tmp.startsWith(cmd));
		//System.out.println(" [S:]"+tmp);
		else 
			throw new Exception(
				"##########邮件发送失败!##########"+tmp);
		while(tmp.startsWith(cmd+"-"))
			tmp=inData.readLine();
	}
	
	//发送SMTP请求码
	private void sendRequest(String msg){
		//System.out.print("***[C:]"+msg);
		outData.write(msg);
		outData.flush();
	}
	
	public void close(){
		try{
			inData.close();
			inData=null;
			outData.close();
			outData=null;
			socket.close();
			socket=null;
		}catch(Exception ex){}
	}
}