import java.util.Date;
import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.MimeMessage;


public class SendMail {
    
     static Authenticator auth = new Authenticator() {
        @Override
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication("username@163.com", "pwd");//发件人的用户名和密码
        }
    };

    public static void main(String[] args) {
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.163.com");//
        props.put("mail.smtp.auth", "true");
        props.put("mail.from", "username@163.com");
        Session session = Session.getInstance(props, auth);
        try {
            MimeMessage msg = new MimeMessage(session);
            msg.setFrom();
            msg.setRecipients(Message.RecipientType.TO, "收件人邮箱");
            msg.setSubject("标题");
            msg.setSentDate(new Date());
            msg.setText("我这里是内容.........");
            Transport.send(msg);
        } catch (MessagingException mex) {
            System.out.println("send failed, exception: " + mex);
        }

    }

}



ps:需要导入mail.jar包
http://download.csdn.net/download/qq531783564/7548771