如何用Java Mail进行认证发信

    1.首先设置属性

     Properties props = new Properties();
  props.put("mail.smtp.host",host);
  props.put("mail.smtp.auth","true");//必须加上true要不然stmp连接的时候不会认证.

    2.写认证类继承自Authenticator:

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

    3.在发信的程序中加上

     MyAuthenticator myAuthenticator = new MyAuthenticator();
  PasswordAuthentication my= myAuthenticator.performCheck(userName,password);
   Session mailsession=Session.getInstance(props,myAuthenticator);