package cn.jmail.test;import java.util.Properties;import javax.mail.*;
import javax.mail.internet.*;public class FirstMail {/*** 发送简单邮件方法* @param host    发送邮件服务器的IP* @param from    发送人地址* @param to    接收人地址* @param subject    邮件主题* @param text    内容* @param senderUsername    发送人的账户* @param senderPassword    发送人的密码* mail.smtp.auth 是否需要身份验证 一般都是需要的*/public static void sendMail(String host, String from, String to, String subject, String text, final String senderUsername, final String senderPassword){Properties props = System.getProperties();props.put("mail.smtp.host", host);props.put("mail.smtp.auth", "true");Session session = Session.getDefaultInstance(props, new Authenticator() {@Overridepublic PasswordAuthentication getPasswordAuthentication(){return new PasswordAuthentication(senderUsername, senderPassword);}});try {MimeMessage message = new MimeMessage(session);message.setFrom(new InternetAddress(from));message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));message.setSubject(subject);message.setText(text);Transport.send(message);} catch (AddressException e) {e.printStackTrace();} catch (MessagingException e) {e.printStackTrace();}}public static void main(String[] args) {String host = "smtp.163.com";String from = "xxxxxx@163.com";String to = "xxxxxxxx@qq.com";String subject = "Hello, this is a test email.";String text = "Hello,LiLei."; String senderUsername = "xxxxxx@163.com";String senderPassword = "xxxxxx";FirstMail.sendMail(host, from, to, subject, text, senderUsername, senderPassword);}
}

嗯，当然不会少了 mail.jar