邮件发送（基础知识最为要命）

package com.fww.mail;

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

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Authenticator;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;

public class JavaMailSendUtil {

props = java.lang.System.getProperties(); // 获得系统属性对象
        String text, String[] filenames, String mimeType) {
    try {
        Properties props = new Properties();  

        String smtp = "smtp.163.com"; // 设置发送邮件所用到的smtp
        String servername = "**@163.com";  //邮箱账号名
        String serverpaswd = "**";  //邮箱密码

        javax.mail.Session mailSession = null; // 邮件会话对象
        javax.mail.internet.MimeMessage mimeMsg = null; // MIME 邮件对象  

        props = java.lang.System.getProperties(); // 获得系统属性对象
        props.put("mail.smtp.host", smtp); // 设置SMTP主机
        props.put("mail.smtp.auth", "true"); // 是否到服务器用户名和密码验证
        // 到服务器验证发送的用户名和密码是否正确
        SmtpAuthenticator myEmailAuther = new SmtpAuthenticator(servername,
                serverpaswd);
        // 设置邮件会话 注意这里将认证信息放进了Session的创建参数里
        mailSession = javax.mail.Session.getInstance(props,
                (Authenticator) myEmailAuther);
        // 设置传输协议
        javax.mail.Transport transport = mailSession.getTransport("smtp");
       // 设置from、to等信息
       mimeMsg = new javax.mail.internet.MimeMessage(mailSession);
       if (null != from && !"".equals(from)) {
           InternetAddress sentFrom = new InternetAddress(from);
           mimeMsg.setFrom(sentFrom); // 设置发送人地址
       }  

       InternetAddress[] sendTo = new InternetAddress[to.length];
       for (int i = 0; i < to.length; i++) {
           System.out.println("发送到:" + to[i]);
           sendTo[i] = new InternetAddress(to[i]);
       }  

       mimeMsg.setRecipients(
               javax.mail.internet.MimeMessage.RecipientType.TO, sendTo);
       mimeMsg.setSubject(subject, "gb2312");  

       MimeBodyPart messageBodyPart1 = new MimeBodyPart();
       // messageBodyPart.setText(UnicodeToChinese(text));
       messageBodyPart1.setContent(text, mimeType);  

       // 附件传输格式
       Multipart multipart = new MimeMultipart();
       multipart.addBodyPart(messageBodyPart1);  

       for (int i = 0; i < filenames.length; i++) {
           MimeBodyPart messageBodyPart2 = new MimeBodyPart();  

           String filename = filenames[i].split(";")[0];
           String displayname = filenames[i].split(";")[1];
           // 得到数据源
           FileDataSource fds = new FileDataSource(filename);
           // BodyPart添加附件本身
           messageBodyPart2.setDataHandler(new DataHandler(fds));
           // BodyPart添加附件文件名
           messageBodyPart2.setFileName(MimeUtility
                   .encodeText(displayname));
           multipart.addBodyPart(messageBodyPart2);
       }
       mimeMsg.setContent(multipart);
       // 设置信件头的发送日期
       mimeMsg.setSentDate(new Date());
       mimeMsg.saveChanges();
       // 发送邮件
       transport.send(mimeMsg);
       transport.close();
       System.out.println("发送到成功!!!");
   } catch (Exception e) {
       e.printStackTrace();
   }

}

public static void main(String[] args) throws Exception {

String title = "测试邮件";// 所发送邮件的标题
   String from = "**@163.com";// 从那里发送
   String sendTo[] = { "**@qq.com","**@sina.com" };// 发送到那里
   // 邮件的文本内容，可以包含html标记则显示为html页面
   String content = "test java send mail !!!!!!<br><a href=‘www.baidu.com‘>你好啊</a>";
 // 所包含的附件，及附件的重新命名
 String fileNames[] = { "d:\\test.jpg;test.jpg","d:\\test.zip;aaa.zip" };  

 JavaMailSendUtil test = new JavaMailSendUtil();
 try {
     // MailSender mailsender = new MailSender();
     test.sendmail(title, from, sendTo, content, fileNames,
             "text/html;charset=gb2312");
 } catch (Exception ex) {
     ex.printStackTrace();
 }

}

class SmtpAuthenticator extends Authenticator {

String username = null;
 String password = null;  

 public SmtpAuthenticator(String username, String password) {
     super();
     this.username = username;
     this.password = password;
 }  

 public PasswordAuthentication getPasswordAuthentication() {
     return new PasswordAuthentication(this.username, this.password);
   }

}
}