javamail技术

package com.zh.javaEmail;

import java.util.*;
import javax.mail.*;

import javax.mail.internet.*;

import javax.activation.*;

public class MysendMail {

 private MimeMessage mimeMsg; // MIME邮件对象

 private Session session; // 邮件会话对象
 private Properties props; // 系统属性
 private boolean needAuth = false; // smtp是否需要认证

 private String username = ""; // smtp认证用户名和密码
 private String password = "";

 private Multipart mp; // Multipart对象,邮件内容,标题,附件等内容均添加到其中后再生成MimeMessage对象

 public MysendMail() {
  // setSmtpHost(getConfig.mailHost);//如果没有指定邮件服务器,就从getConfig类中获取
  createMimeMessage();
 }

 public MysendMail(String smtp) {
  setSmtpHost(smtp);
  createMimeMessage();
 }

 /**
  * @param hostName
  *            String
  */
 public void setSmtpHost(String hostName) {

  System.out.println("设置系统属性：mail.smtp.host = " + hostName);
  if (props == null)
   props = System.getProperties(); // 获得系统属性对象

  props.put("mail.smtp.host", hostName); // 设置SMTP主机

 }

 /**
  * @return boolean
  */
 public boolean createMimeMessage() {
  try {
   System.out.println("准备获取邮件会话对象！");
   session = Session.getDefaultInstance(props, null); // 获得邮件会话对象
  }

  catch (Exception e) {
   System.err.println("获取邮件会话对象时发生错误！" + e);
   return false;
  }

  System.out.println("准备创建MIME邮件对象！");

  try {

   mimeMsg = new MimeMessage(session); // 创建MIME邮件对象
   mp = new MimeMultipart();

   return true;

  } catch (Exception e) {

   System.err.println("创建MIME邮件对象失败！" + e);
   return false;
  }
 }

 /**
  * @param need
  *            boolean
  */
 public void setNeedAuth(boolean need) {

  System.out.println("设置smtp身份认证：mail.smtp.auth = " + need);
  if (props == null)
   props = System.getProperties();
  if (need) {
   props.put("mail.smtp.auth", "true");
  } else {
   props.put("mail.smtp.auth", "false");
  }
 }

 /**
  * @param name
  *            String
  * @param pass
  *            String
  */
 public void setNamePass(String name, String pass) {
  username = name;
  password = pass;
 }

 /**
  * @param mailSubject
  *            String
  * @return boolean
  */
 public boolean setSubject(String mailSubject) {
  System.out.println("设置邮件主题！");
  try {
   mimeMsg.setSubject(mailSubject);
   return true;
  } catch (Exception e) {
   System.err.println("设置邮件主题发生错误！");
   return false;
  }
 }

 /**
  * @param mailBody
  *            String
  */
 public boolean setBody(String mailBody) {
  try {
   BodyPart bp = new MimeBodyPart();
   bp.setContent(
     "<meta http-equiv=Content-Type content=text/html; charset=gb2312>"
       + mailBody, "text/html;charset=GB2312");
   mp.addBodyPart(bp);

   return true;
  } catch (Exception e) {
   System.err.println("设置邮件正文时发生错误！" + e);
   return false;
  }
 }

 /**
  * @param name
  *            String
  * @param pass
  *            String
  */
 public boolean addFileAffix(String filename) {

  System.out.println("增加邮件附件：" + filename);

  try {
   BodyPart bp = new MimeBodyPart();
   FileDataSource fileds = new FileDataSource(filename);
   bp.setDataHandler(new DataHandler(fileds));
   bp.setFileName(fileds.getName());

   mp.addBodyPart(bp);

   return true;
  } catch (Exception e) {
   System.err.println("增加邮件附件：" + filename + "发生错误！" + e);
   return false;
  }
 }

 /**
  * @param name
  *            String
  * @param pass
  *            String
  */
 public boolean setFrom(String from) {
  System.out.println("设置发信人！");
  try {
   mimeMsg.setFrom(new InternetAddress(from)); // 设置发信人
   return true;
  } catch (Exception e) {
   return false;
  }
 }

 /**
  * @param name
  *            String
  * @param pass
  *            String
  */
 public boolean setTo(String to) {
  if (to == null)
   return false;

  try {
   mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress
     .parse(to));
   return true;
  } catch (Exception e) {
   return false;
  }

 }

 /**
  * @param name
  *            String
  * @param pass
  *            String
  */
 public boolean setCopyTo(String copyto) {
  if (copyto == null)
   return false;
  try {
   mimeMsg.setRecipients(Message.RecipientType.CC,
     (Address[]) InternetAddress.parse(copyto));
   return true;
  } catch (Exception e) {
   return false;
  }
 }

 /**
  * @param name
  *            String
  * @param pass
  *            String
  */
 public boolean sendout() {
  try {
   mimeMsg.setContent(mp);
   mimeMsg.saveChanges();
   System.out.println("正在发送邮件....");

   Session mailSession = Session.getInstance(props, null);
   Transport transport = mailSession.getTransport("smtp"); //传送数据的类
   transport.connect((String) props.get("mail.smtp.host"), username,
     password);
   transport.sendMessage(mimeMsg, mimeMsg
     .getRecipients(Message.RecipientType.TO));

   System.out.println("发送邮件成功！");
   transport.close();
   return true;
  } catch (Exception e) {
   System.err.println("邮件发送失败！" + e);
   return false;
  }

 }

}

/*这个是封装的类*/

package com.zh.javaEmail;

public class SendMailToSomeone {

 public static void main(String []args){

  SendMailToSomeone sts=new SendMailToSomeone();
  sts.send("aa", "hello", "xxxxx@qq.com",
    "xxxxx@163.com", "xxxx", "smtp.163.com");
 }

 /**
  * 发送电子邮件到指定的信箱
  * @param title 邮件标题
  * @param mailbody 邮件内容【一个网页，表格ok】
  * @param sendTo 发送给谁 xxxx@tsinghua.org.cn
  * @param from 从哪些发送 admin@sohu.com
  * @param passwd 密码 123456
  * @param sendStmp 发送邮件的smtp smtp.sohu.com [smtp.163.com] [smtp.sina.com] [smtp.qq.com]
  */
 public void send(String title,String mailbody,String sendTo,String from,String passwd,String sendStmp){

  //指明让那个smtp转发(搜狐)
  MysendMail themail = new MysendMail(sendStmp);
  //校验身份
  themail.setNeedAuth(true);
  //邮件标题
  if(themail.setSubject(title) == false) return;
  //将要发送的 内容放入邮件体
  if(themail.setBody(mailbody) == false) return;

  //发送到哪里
  if(themail.setTo(sendTo) == false) return;

  //谁发送的
  if(themail.setFrom(from) == false) return;

     //if(themail.addFileAffix("e:\\butterfly.gif") == false) return;

  //将在sohu网站上的邮件用户名和 密码 放入邮件体
  themail.setNamePass(from,passwd);
  //发送
  if(themail.sendout() == false) return;
 }
}

需要注意的几点：

1. java.lang.NoClassDefFoundError: com/sun/mail/util/BEncoderStream

这个问题是Mail.jar包没有引入到java路径中，或者是版本的问题，

重新下载一个MailXXXXX.zip 然后引包

2.Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/mail/util/LineInputStreams

　　原因是jar包版本不统一,解决方法如下: 删除Java EE 5 Libraries/javaee.jar/mail里的包有东西. 具体方法如下: 在Myeclipse6.0.1中用rar打开X:/Program Files/MyEclipse 6.0/myeclipse/eclipse/plugins/com.genuitec.eclipse.j2eedt.core_6.0.1.zmyeclipse601200710/data/libraryset/EE_5/javaee.jar 在Myeclipse8.5中 D:/Program Files/MyEclipse 8.5/Common/plugins/com.genuitec.eclipse.j2eedt.core_8.5.0.me201003231033/data/libraryset/EE_5/EE_5/javaee.jar ,然后删除mail,一切就ok了. 若删除的时候出错，则需要先在myeclipse里面删除掉引用了J2ee5.0的工程，然后再关闭myeclipse再进行删除操作。

注意当删除javaee.jar中的文件时，要删除mail和activation两个,然后再添加mail.jar和activation.jar两个包就可以了