package com.zjh.shopping.util;

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 {  

    public  void sendmail(String subject, String from, String[] to,

            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 = "*******";  //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" };// 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="http://sjsky.javaeye.com/">My blog</a>";

     // 所包含的附件，及附件的重新命名

     String fileNames[] = { "d:\\test.jpg;test.jpg" };  

     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);

       }

   }

}  

package com.gree.mail.mailsend;

import java.util.Properties;

import javax.mail.Message;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeMessage;

import javax.naming.InitialContext;

import javax.naming.NamingException;

import com.sun.xml.internal.messaging.saaj.packaging.mime.MessagingException;

public class Mailsend2 {

public static Session getSession() {

    Session session = null;

//      session = (Session)new InitialContext().lookup("MailSession");

      Properties props = new Properties();

      props.put("mail.smtp.host", "10.1.1.168");

      props.put("mail.smtp.auth", "false");

      session = Session.getDefaultInstance(props, null);

    return session;

}

public static void sendMessage(String from, String[] to, String[] cc, String subject, String content,

                                 String mimeType) throws javax.mail.MessagingException {

    Message message = new MimeMessage(getSession());

    if (!StringUtils.isEmpty(from)) {

      InternetAddress sentFrom = new InternetAddress(from);

      message.setFrom(sentFrom);

    }

    InternetAddress[] sendTo = new InternetAddress[to.length];

    for (int i = 0; i < to.length; i++) {

      sendTo[i] = new InternetAddress(to[i]+"@gree.com.cn");

    }

    if ( (cc.length > 0) && (cc[0] != null)) {

      InternetAddress[] copyTo = new InternetAddress[cc.length];

      for (int i = 0; i < cc.length; i++) {

        copyTo[i] = new InternetAddress(cc[i]+"@gree.com.cn");

      }

      message.setRecipients(Message.RecipientType.CC, copyTo);

    }

    message.setRecipients(Message.RecipientType.TO, sendTo);

    //System.out.println("发送人员："+message.getRecipients(Message.RecipientType.TO));

    //System.out.println("抄送人员："+message.getRecipients(Message.RecipientType.CC))

    message.setSubject(subject);

    message.setContent(content, mimeType);

    Transport.send(message);

 }

public void sendHTMLMessage(String[] to, String[] cc, String title, String content)throws MessagingException {

    try {

        sendMessage("SCBWEB", to, cc, title+"-模具管理系统信息", content, "text/html;Charset=gb2312");

    } catch (javax.mail.MessagingException e) {

        // TODO Auto-generated catch block

        e.printStackTrace();

    }

         // System.out.println("2="+content);

}

public static void main(String[] args) {

    String [] to= new String[] {"180172"};

    String [] cc= new String[] {"180158"};

    String title="ceshi";

    String content="晚上小天请我们吃烤鱼，8号门对面，大概67点左右，等下下班别走开";

    try {

        Mailsend2.sendMessage("180170@gree.com.cn", to, cc, title, content, "text/html;Charset=utf-8");

    } catch (javax.mail.MessagingException e) {

        // TODO Auto-generated catch block

        e.printStackTrace();

}

    }

}

出现这个问题的原因是jar包版本不统一,解决方法如下:
我在项目导入了jar包

与myeclipse自带jar冲突了

删除Java EE 5 Libraries/javaee.jar/mail里的包有东西.

具体操作：

进入myeclipse的安装目录：我安装的是myeclipse blue 8.5 具体路径如下

E:\development_tools\myeclipse_8.5\install_d\common\plugins\com.genuitec.eclipse.j2eedt.core_8.5.0.me201003231033\data\libraryset\EE_5

找到javaee.jar，打开后删除mail文件夹即可（需要先关闭运行着的myeclipse，否则无法删除）