注意：需要引入activation.jar

  cos.jar

    mail.jar，

并且删除掉j2ee中的重复jar包（我的路径是D:\myeclipse10For32\Common\plugins\com.genuitec.eclipse.j2eedt.core_10.0.0.me201110301321\data\libraryset\EE_5\javaee.jar），用winrar打开javaee.jar，删除掉activation和mail两个包就OK了

具体我的demo下载地址：http://download.csdn.net/detail/l294333475/7698349

package com.util.mail;

public class test{
public static void main(String[] args){   
         //这个类主要是设置邮件   
      MailSenderInfo mailInfo = new MailSenderInfo();    
      mailInfo.setMailServerHost("smtp.163.com");    
      mailInfo.setMailServerPort("25");    
      mailInfo.setValidate(true);    
      mailInfo.setUserName("18262396202@163.com");    
      mailInfo.setPassword("*************");//您的邮箱密码    
      mailInfo.setFromAddress("18262396202@163.com");    
      mailInfo.setToAddress("18751870673@163.com");    
      mailInfo.setSubject("刘鹏");
      mailInfo.setContent("你好，我是刘鹏，测试JavaMail");    
         //这个类主要来发送邮件   
      SimpleMailSender sms = new SimpleMailSender();   
          sms.sendTextMail(mailInfo);//发送文体格式    
          sms.sendHtmlMail(mailInfo);//发送html格式   
    }  
}

package com.util.mail;
/**   
* 发送邮件需要使用的基本信息 
*author by wangfun
http://www.5a520.cn 小说520  
*/    
import java.util.Properties; 
public class MailSenderInfo {    
    // 发送邮件的服务器的IP和端口    
    private String mailServerHost;    
    private String mailServerPort = "25";    
    // 邮件发送者的地址    
    private String fromAddress;    
    // 邮件接收者的地址    
    private String toAddress;    
    // 登陆邮件发送服务器的用户名和密码    
    private String userName;    
    private String password;    
    // 是否需要身份验证    
    private boolean validate = false;    
    // 邮件主题    
    private String subject;    
    // 邮件的文本内容    
    private String content;    
    // 邮件附件的文件名    
    private String[] attachFileNames;      
    /**   
      * 获得邮件会话属性   
      */    
    public Properties getProperties(){    
      Properties p = new Properties();    
      p.put("mail.smtp.host", this.mailServerHost);    
      p.put("mail.smtp.port", this.mailServerPort);    
      p.put("mail.smtp.auth", validate ? "true" : "false");    
      return p;    
    }    
    public String getMailServerHost() {    
      return mailServerHost;    
    }    
    public void setMailServerHost(String mailServerHost) {    
      this.mailServerHost = mailServerHost;    
    }   
    public String getMailServerPort() {    
      return mailServerPort;    
    }   
    public void setMailServerPort(String mailServerPort) {    
      this.mailServerPort = mailServerPort;    
    }   
    public boolean isValidate() {    
      return validate;    
    }   
    public void setValidate(boolean validate) {    
      this.validate = validate;    
    }   
    public String[] getAttachFileNames() {    
      return attachFileNames;    
    }   
    public void setAttachFileNames(String[] fileNames) {    
      this.attachFileNames = fileNames;    
    }   
    public String getFromAddress() {    
      return fromAddress;    
    }    
    public void setFromAddress(String fromAddress) {    
      this.fromAddress = fromAddress;    
    }   
    public String getPassword() {    
      return password;    
    }   
    public void setPassword(String password) {    
      this.password = password;    
    }   
    public String getToAddress() {    
      return toAddress;    
    }    
    public void setToAddress(String toAddress) {    
      this.toAddress = toAddress;    
    }    
    public String getUserName() {    
      return userName;    
    }   
    public void setUserName(String userName) {    
      this.userName = userName;    
    }   
    public String getSubject() {    
      return subject;    
    }   
    public void setSubject(String subject) {    
      this.subject = subject;    
    }   
    public String getContent() {    
      return content;    
    }   
    public void setContent(String textContent) {    
      this.content = textContent;    
    }    
}   


package com.util.mail;   

import java.util.Date;    
import java.util.Properties;   
import javax.mail.Address;    
import javax.mail.BodyPart;    
import javax.mail.Message;    
import javax.mail.MessagingException;    
import javax.mail.Multipart;    
import javax.mail.Session;    
import javax.mail.Transport;    
import javax.mail.internet.InternetAddress;    
import javax.mail.internet.MimeBodyPart;    
import javax.mail.internet.MimeMessage;    
import javax.mail.internet.MimeMultipart;    
  
/**   
* 简单邮件（不带附件的邮件）发送器   
http://www.bt285.cn BT下载
*/    
public class SimpleMailSender  {    
/**   
  * 以文本格式发送邮件   
  * @param mailInfo 待发送的邮件的信息   
  */    
    public boolean sendTextMail(MailSenderInfo mailInfo) {    
      // 判断是否需要身份认证    
      MyAuthenticator authenticator = null;    
      Properties pro = mailInfo.getProperties();   
      if (mailInfo.isValidate()) {    
      // 如果需要身份认证，则创建一个密码验证器    
        authenticator = new MyAuthenticator(mailInfo.getUserName(), mailInfo.getPassword());    
      }   
      // 根据邮件会话属性和密码验证器构造一个发送邮件的session    
      Session sendMailSession = Session.getDefaultInstance(pro,authenticator);    
      try {    
      // 根据session创建一个邮件消息    
      Message mailMessage = new MimeMessage(sendMailSession);    
      // 创建邮件发送者地址    
      Address from = new InternetAddress(mailInfo.getFromAddress());    
      // 设置邮件消息的发送者    
      mailMessage.setFrom(from);    
      // 创建邮件的接收者地址，并设置到邮件消息中    
      Address to = new InternetAddress(mailInfo.getToAddress());    
      mailMessage.setRecipient(Message.RecipientType.TO,to);    
      // 设置邮件消息的主题    
      mailMessage.setSubject(mailInfo.getSubject());    
      // 设置邮件消息发送的时间    
      mailMessage.setSentDate(new Date());    
      // 设置邮件消息的主要内容    
      String mailContent = mailInfo.getContent();    
      mailMessage.setText(mailContent);    
      // 发送邮件    
      Transport.send(mailMessage);   
      return true;    
      } catch (MessagingException ex) {    
          ex.printStackTrace();    
      }    
      return false;    
    }    
       
    /**   
      * 以HTML格式发送邮件   
      * @param mailInfo 待发送的邮件信息   
      */    
    public static boolean sendHtmlMail(MailSenderInfo mailInfo){    
      // 判断是否需要身份认证    
      MyAuthenticator authenticator = null;   
      Properties pro = mailInfo.getProperties();   
      //如果需要身份认证，则创建一个密码验证器     
      if (mailInfo.isValidate()) {    
        authenticator = new MyAuthenticator(mailInfo.getUserName(), mailInfo.getPassword());   
      }    
      // 根据邮件会话属性和密码验证器构造一个发送邮件的session    
      Session sendMailSession = Session.getDefaultInstance(pro,authenticator);    
      try {    
      // 根据session创建一个邮件消息    
      Message mailMessage = new MimeMessage(sendMailSession);    
      // 创建邮件发送者地址    
      Address from = new InternetAddress(mailInfo.getFromAddress());    
      // 设置邮件消息的发送者    
      mailMessage.setFrom(from);    
      // 创建邮件的接收者地址，并设置到邮件消息中    
      Address to = new InternetAddress(mailInfo.getToAddress());    
      // Message.RecipientType.TO属性表示接收者的类型为TO    
      mailMessage.setRecipient(Message.RecipientType.TO,to);    
      // 设置邮件消息的主题    
      mailMessage.setSubject(mailInfo.getSubject());    
      // 设置邮件消息发送的时间    
      mailMessage.setSentDate(new Date());    
      // MiniMultipart类是一个容器类，包含MimeBodyPart类型的对象    
      Multipart mainPart = new MimeMultipart();    
      // 创建一个包含HTML内容的MimeBodyPart    
      BodyPart html = new MimeBodyPart();    
      // 设置HTML内容    
      html.setContent(mailInfo.getContent(), "text/html; charset=utf-8");    
      mainPart.addBodyPart(html);    
      // 将MiniMultipart对象设置为邮件内容    
      mailMessage.setContent(mainPart);    
      // 发送邮件    
      Transport.send(mailMessage);    
      return true;    
      } catch (MessagingException ex) {    
          ex.printStackTrace();    
      }    
      return false;    
    }    
}   


package com.util.mail;   

import javax.mail.*;   
     
public class MyAuthenticator extends Authenticator{   
    String userName=null;   
    String password=null;   
        
    public MyAuthenticator(){   
    }   
    public MyAuthenticator(String username, String password) {    
        this.userName = username;    
        this.password = password;    
    }    
    protected PasswordAuthentication getPasswordAuthentication(){   
        return new PasswordAuthentication(userName, password);   
    }   
}