android发送邮件（包括附件）

    android发送邮件初期遇到的问题：
    1.发送到QQ邮箱成为垃圾邮件
    2.发送到有些邮箱，没有正文
    经过几次试验，终于能够正常发送邮件了。
    以下是代码：
 
public class
MailSender {
    /** * send mail
    * @param mailInfo Info
    */
    public booleansendMail(MailSenderInfomailInfo){

        // Determine whether authentication

        MyAuthenticator
authenticator;
        Properties
pro=mailInfo.getProperties();
        if (mailInfo.isValidate()){
            // Create a password verifier
            authenticator
= new MyAuthenticator(mailInfo.getUserName(),mailInfo.getPassword());
        }
        else {

            return
false;
        }
        Session
sendMailSession=Session.getDefaultInstance(pro,authenticator);
        try {
            Message
mailMessage=new
MimeMessage(sendMailSession);
            //Create From Address
            Address
from=new InternetAddress(mailInfo.getFromAddress());
            // Set From Address
            mailMessage.setFrom(from);
            // Create To Address
            Address
to=new InternetAddress(mailInfo.getToAddress());
            mailMessage.setRecipient(Message.RecipientType.TO,to);
            mailMessage.setSubject(mailInfo.getSubject());
            mailMessage.setSentDate(newDate());
            String
mailContent=mailInfo.getContent();
            Multipart
mainPart=new
MimeMultipart();
            //create body text
            MimeBodyPart
body_text=new
MimeBodyPart();
            body_text.setText(mailContent);
            mainPart.addBodyPart(body_text);
            //create Attach File

            for
(Stringfilename:mailInfo.getAttachFileNames()){
            FileDataSource
fileDataSource = new
FileDataSource(new
File(filename));
            DataHandler
dataHandler=new
DataHandler(fileDataSource);
            MimeBodyPart
mimeBodyPart=new
MimeBodyPart();
            mimeBodyPart.setDataHandler(dataHandler);
            try
{
                 String
fileNameNew=MimeUtility.encodeText(fileDataSource.getName(),"utf-8",null);
                 mimeBodyPart.setFileName(fileNameNew);
            }
catch(UnsupportedEncodingExceptione)
{
                 e.printStackTrace();
                 mimeBodyPart.setFileName(fileDataSource.getName());
            }
            mimeBodyPart.setText(mailInfo.getContent());
            mainPart.addBodyPart(mimeBodyPart);
            mailMessage.setContent(mainPart);
        }
        mailMessage.saveChanges();
        // send email
       Transport.send(mailMessage);
        return
true;
    } catch(MessagingExceptionex)
{
         ex.printStackTrace();
    } returnfalse;
}
 

    class MyAuthenticatorextendsAuthenticator
{
        String
userName=null;
        String
password=null;
        public
MyAuthenticator(Stringusername,Stringpassword){
            this.userName=username;
this.password=
password;
        }
        protected
PasswordAuthenticationgetPasswordAuthentication(){
            return
newPasswordAuthentication(userName,password);
        }
    }
 

}