附加文件，并在Android的使用SMTP发送邮件 [英] attaching file and sending mail using smtp in android

问题描述

在我的应用程序正在使用smtp.i要附加图像文件mail.how可以附上它发送邮件？我试着在mail.its赠送小图标它。但是没有得到的图像。
请help.thanks提前。
下面是邮寄code和邮件的形象它的外观 -

 公共类MailImageFile扩展javax.mail.Authenticator {公共MailImageFile（）{}
公共无效邮件（用户字符串，字符串传递）{    属性道具=新特性（）;
    props.put（mail.smtp.host，smtp.gmail.com）;
    props.put（mail.smtp.socketFactory.port，465）;
    props.put（mail.smtp.socketFactory.class，javax.net.ssl​​.SSLSocketFactory）;
    props.put（mail.smtp.auth，真）;
    props.put（mail.smtp.port，465）;    会话的会话=作为Session.getDefaultInstance（道具，新javax.mail.Authenticator（）{
        受保护的PasswordAut​​hentication的getPasswordAut​​hentication（）{
            返回新的PasswordAut​​hentication（用户名，密码）;
        }
        }）;
    尝试{        消息消息=新的MimeMessage（会话）;
        message.setFrom（新网际地址（用户名））;
        message.setRecipients（Message.RecipientType.TO，InternetAddress.parse（TO））;
        message.setSubject（测试题目）;
       多部分多部分=新MimeMultipart的（）;
        MimeBodyPart messageBodyPart =新MimeBodyPart（）;
        数据源源=新FileDataSource（新文件（Environment.getExternalStorageDirectory（）getAbsolutePath（）+/ wallpaper.jpg））;
        messageBodyPart.setDataHandler（新的DataHandler（源））;
        messageBodyPart.setFileName（image.png）;
        messageBodyPart.setDisposition（MimeBodyPart.ATTACHMENT）;
        messageBodyPart.setHeader（内容ID，＆所述;时尚＆gt;中）;
        multipart.addBodyPart（messageBodyPart）;                  message.setContent（多部分）;        Transport.send（消息）;
    }赶上（MessagingException E）{
        抛出新的RuntimeException（E）;
    }
}
 }
 

解决方案

在第二个想法：

使用 javax.mail.util.ByteArrayDataSource：

 多节多部分=新MimeMultipart的（）;
数据源源=新ByteArrayDataSource（镜像文件，图像/ BMP）;//为消息造成的身体部位
MimeBodyPart messageBodyPart =新MimeBodyPart（）;
messageBodyPart.setContent（嗨......，text / html的;字符集= UTF-8）;MimeBodyPart attachPart;
attachPart =新MimeBodyPart（）;
attachPart .setDataHandler（新的DataHandler（源））;
attachPart .setFileName（文件名）;multipart.addBodyPart（messageBodyPart）;
multipart.addBodyPart（attachPart）;message.setContent（多部分）;
 

ByteArrayDataSource 的构造预计为参数或者一个字节数组或一个InputStream。所以，如果你有在变量BMP位图，你会得到它的ByteArray是这样的：

  ByteArrayOutputStream流=新ByteArrayOutputStream（）;
bmp.com preSS（Bitmap.Com pressFormat.PNG，100，流）;
字节[]的字节数组= stream.toByteArray（）;
 

和会使用它在这样的ByteArrayDataSource：

 数据源源=新ByteArrayDataSource（字节数组，图像/ PNG）;
 

in my application i'm sending mail using smtp.i want to attach image file to mail.how can i attach it?i tried it.but not getting image in mail.its giving small icon. please help.thanks in advance. below is mailing code and image of mail how it looks-

 public class MailImageFile extends javax.mail.Authenticator {

public MailImageFile(){

}
public void Mail(String user, String pass) {    

    Properties props = new Properties();
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.socketFactory.port", "465");
    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.port", "465");

    Session session = Session.getDefaultInstance(props, new javax.mail.Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(USERNAME, PASSWORD);
        }
        });
    try {

        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress(USERNAME));
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(TO));
        message.setSubject("Testing Subject");     
       Multipart multipart = new MimeMultipart();


        MimeBodyPart messageBodyPart = new MimeBodyPart();
        DataSource source = new FileDataSource(new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/wallpaper.jpg"));
        messageBodyPart.setDataHandler(new DataHandler(source));
        messageBodyPart.setFileName("image.png");
        messageBodyPart.setDisposition(MimeBodyPart.ATTACHMENT);
        messageBodyPart.setHeader("Content-ID","<vogue>");
        multipart.addBodyPart(messageBodyPart);

                  message.setContent(multipart);

        Transport.send(message);
    } catch (MessagingException e) {
        throw new RuntimeException(e);
    }           
}   
 }

解决方案

On second thought:

Use javax.mail.util.ByteArrayDataSource:

Multipart multipart = new MimeMultipart();
DataSource source = new ByteArrayDataSource(imageFile, "image/bmp");

// creates body part for the message
MimeBodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setContent("Hi...", "text/html; charset=utf-8");

MimeBodyPart attachPart;
attachPart = new MimeBodyPart();
attachPart .setDataHandler(new DataHandler(source));
attachPart .setFileName(filename);

multipart.addBodyPart(messageBodyPart);
multipart.addBodyPart(attachPart);

message.setContent(multipart);

ByteArrayDataSource's constructor expects as parameters either a byte array or an InputStream. So, if you have your Bitmap in the variable bmp you would get it to the byteArray like this:

ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();

and would use it in the ByteArrayDataSource like this:

DataSource source = new ByteArrayDataSource(byteArray, "image/png");

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