主程序：
程序抛出异常：javax.mail.AuthenticationFailedException 是什么原因，求指点。。。

package Model;


public class SendMailToSomeone {


 public static void main(String []args){
  
  SendMailToSomeone smts=new SendMailToSomeone();
  smts.send("aa", "hello", "Crazy4J@126.com",
    "Crazy_4J@sohu.com", "xxx", "smtp.sohu.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 hanshunping@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]
 */
 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;
  
   
 // if()
  //将在sohu网站上的邮件用户名和 密码 放入邮件体 
  themail.setNamePass("xxx",passwd);
  
  //发送
  if(themail.sendout() == false) return;
 }
}






MysendMail.java


package Model;


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) {
S