Java发送邮件

Java发送邮件，适用于自动找回密码等！

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.SocketException;
import java.rmi.UnknownHostException;
import java.util.StringTokenizer;


import sun.misc.BASE64Encoder;


public class Sender {
	//private boolean debug = true;
	BASE64Encoder encode=new BASE64Encoder();//编码BASE64后发送用户名和密码
	static int dk=25;
	
	

	private Socket socket;

	public Sender(String server, int port) throws UnknownHostException,
			IOException {
		try {
			socket = new Socket(server, dk);
		} catch (SocketException e) {
			System.out.println(e.getMessage());
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			//System.out.println("已经建立连接!");
		}

	}

	// 注册到邮件服务器
	public void helo(String server, BufferedReader in, BufferedWriter out)
			throws IOException {
		int result;
		result = getResult(in);
		// 连接上邮件服务后,服务器给出220应答
		if (result != 220) {
			throw new IOException("连接服务器失败");
		}
		result = sendServer("HELO " + server, in, out);
		// HELO命令成功后返回250
		if (result != 250) {
			throw new IOException("注册邮件服务器失败！");
		}
	}

	private int sendServer(String str, BufferedReader in, BufferedWriter out)
			throws IOException {
		out.write(str);
		out.newLine();
		out.flush();
		/*
		if (debug) {
			System.out.println("已发送命令:" + str);
		}
		*/
		return getResult(in);
	}

	public int getResult(BufferedReader in) {
		String line = "";
		try {
			line = in.readLine();
			/*
			if (debug) {
				System.out.println("服务器返回状态:" + line);
			}
			*/
		} catch (Exception e) {
			e.printStackTrace();
		}
		// 从服务器返回消息中读出状态码,将其转换成整数返回
		
		StringTokenizer st = new StringTokenizer(line, " ");
		return Integer.parseInt(st.nextToken());
	}

	public void authLogin(MailMessage message, BufferedReader in,
			BufferedWriter out) throws IOException {
		int result;
		result = sendServer("AUTH LOGIN", in, out);

		if (result != 334) {
			throw new IOException("用户验证失败！");
		}

		result=sendServer(encode.encode(message.getUser().getBytes()),in,out);
		//System.out.println("用户名：	"+encode.encode(message.getUser().getBytes()));
		if (result != 334) {
			throw new IOException("用户名错误！");
		}
		result=sendServer(encode.encode(message.getPassword().getBytes()),in,out);
		//result=sendServer(message.getPassword(),in,out);
		//System.out.println("密码：	"+encode.encode(message.getPassword().getBytes()));
		if (result != 235) {
			throw new IOException("验证失败！");
		}
	}

	// 开始发送消息，邮件源地址
	public void mailfrom(String source, BufferedReader in, BufferedWriter out)
			throws IOException {
		int result;
		result = sendServer("MAIL FROM:<" + source + ">", in, out);
		if (result != 250) {
			throw new IOException("指定源地址错误");
		}
	}

	// 设置邮件收件人
	public void rcpt(String touchman, BufferedReader in, BufferedWriter out)
			throws IOException {
		int result;
		result = sendServer("RCPT TO:<" + touchman + ">", in, out);
		if (result != 250) {
			throw new IOException("指定目的地址错误！");
		}
	}

	// 邮件体
	public void data(String from, String to, String subject, String content,
			BufferedReader in, BufferedWriter out) throws IOException {
		int result;
		result = sendServer("DATA", in, out);
		// 输入DATA回车后,若收到354应答后,继续输入邮件内容
		if (result != 354) {
			throw new IOException("不能发送数据");
		}
		out.write("From: " + from);
		out.newLine();
		out.write("To: " + to);
		out.newLine();
		out.write("Subject: " + subject);
		out.newLine();
		out.newLine();
		out.write(content);
		out.newLine();
		// 句号加回车结束邮件内容输入
		result = sendServer(".", in, out);
		//System.out.println(result);
		if (result != 250) {
			throw new IOException("发送数据错误");
		}
	}

	// 退出
	public void quit(BufferedReader in, BufferedWriter out) throws IOException {
		int result;
		result = sendServer("QUIT", in, out);
		if (result != 221) {
			throw new IOException("未能正确退出");
		}
	}

	// 发送邮件主程序
	public boolean sendMail(MailMessage message, String server) {
		try {
			BufferedReader in = new BufferedReader(new InputStreamReader(
					socket.getInputStream()));
			BufferedWriter out = new BufferedWriter(new OutputStreamWriter(
					socket.getOutputStream()));
			helo(server, in, out);// HELO命令
			authLogin(message, in, out);// AUTH LOGIN命令
			mailfrom(message.getFrom(), in, out);// MAIL FROM
			rcpt(message.getTo(), in, out);// RCPT
			data(message.getDatafrom(), message.getDatato(),
					message.getSubject(), message.getContent(), in, out);// DATA
			quit(in, out);// QUIT
		} catch (Exception e) {
			e.printStackTrace();
			return false;

		}
		return true;
	}
}

大家可能找不到BASE64Encoder()，在项目下单击右键，选择Properties->java build path->libraries->accessible rules:

然后MailMessage.java

public class MailMessage {
	private String from;
	 private String to;
	 private String datafrom;
	 private String datato;
	 private String subject;
	 private String content;
	 private String date;
	 private String user;
	 private String password;
	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 = to;
	}
	public String getDatafrom() {
		return datafrom;
	}
	public void setDatafrom(String datafrom) {
		this.datafrom = datafrom;
	}
	public String getDatato() {
		return datato;
	}
	public void setDatato(String datato) {
		this.datato = datato;
	}
	public String getSubject() {
		return subject;
	}
	public void setSubject(String subject) {
		this.subject = subject;
	}
	public String getContent() {
		return content;
	}
	public void setContent(String content) {
		this.content = content;
	}
	public String getDate() {
		return date;
	}
	public void setDate(String date) {
		this.date = date;
	}
	public String getUser() {
		return user;
	}
	public void setUser(String user) {
		this.user = user;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
}

以下调用：

MailMessage message = new MailMessage();
			message.setFrom("[email protected]");// 发件人
			message.setTo(mail);// 收件人
			String server = "smtp.163.com";// 邮件服务器
			message.setSubject("找回密码");// 邮件主题
			message.setContent(uf.getUname()+"，你好，这是你进行的找回密码服务，你的密码是："+pass+"，请牢记你的密码。");// 邮件内容
			message.setDatafrom("系统管理员");// 发件人，在邮件的发件人栏目中显示
			message.setDatato(mail);// 收件人，在邮件的收件人栏目中显示
			message.setUser("myscotts");// 登陆邮箱的用户名
			message.setPassword("12345678");// 登陆邮箱的密码
			Sender smtp = new Sender(server, 25);
			boolean flag;
			flag = smtp.sendMail(message, server);