使用javamail API发送带有附件的电子邮件

我正在尝试发送一封带有Java附件文件的电子邮件

当我发送没有附件的电子邮件时，我会收到电子邮件，但当我添加附件时，我不会收到任何东西，也不会收到任何错误消息

这是我正在使用的代码：

public void send () throws AddressException, MessagingException{
    //system properties

Properties  props = new Properties();
props.put("mail.smtp.localhost", "localhost"); 
props.put("mail.smtp.host",Configurations.getInstance().email_serverIp); 


/*
 *  create some properties and get the default Session
 */
session = Session.getDefaultInstance(props, null);

//session
Session session = Session.getInstance(props, null);

Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("zouhaier.mhamdi@gmail.com"));
message.setRecipients(Message.RecipientType.TO,
        InternetAddress.parse("zouhaier.mhamdi@gmail.com"));
message.setSubject("Testing Subject");
message.setText("PFA");

MimeBodyPart messageBodyPart = new MimeBodyPart();

Multipart multipart = new MimeMultipart();
   generateCsvFile("/tmp/test.csv"); 
messageBodyPart = new MimeBodyPart();
String file = "/tmp/test.csv";
String fileName = "test.csv"; 
DataSource source = new FileDataSource(file);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(fileName);
multipart.addBodyPart(messageBodyPart);

message.setContent(multipart);

System.out.println("Sending");

Transport.send(message);

System.out.println("Done");

}

private static void generateCsvFile(String sFileName)
{
    try
    {

    FileWriter writer = new FileWriter(sFileName);

    writer.append("DisplayName");
    writer.append(',');
    writer.append("Age");
    writer.append(',');
    writer.append("YOUR NAME");
    writer.append(',');

    writer.append('\n');
    writer.append("Zou");
    writer.append(',');
    writer.append("26");
    writer.append(',');
    writer.append("zouhaier");


    //generate whatever data you want

    writer.flush();
    writer.close();
    }
    catch(IOException e)
    {
         e.printStackTrace();
    } 
 }

如何更正此问题？

有关详细信息，请参阅JavaMail常见问题解答。特别是，协议跟踪将告诉您更多关于每种情况下发生的情况。当你在那里的时候，你也会发现使用GMail的技巧

---

如果唯一的区别实际上只是添加了一个附件，那么这似乎不太可能是身份验证问题。由于send方法被声明为抛出MessaginException，您可能会遇到一个未注意到的异常。

您可以尝试以下操作：

File f = new File(file);
MimeBodyPart attachmentPart = new MimeBodyPart();
attachmentPart.attachFile(f);
multipart.addBodyPart(attachmentPart);

请参阅以下方面的更多详细信息：

禁用你的防病毒软件

因为你有这样的警告

请尝试此代码。。。它帮助你

public class SendMail {
    public SendMail() throws MessagingException {
        String host = "smtp.gmail.com";
        String Password = "............";
        String from = "XXXXXXXXXX@gmail.com";
        String toAddress = "YYYYYYYYYYYYY@gmail.com";
        String filename = "C:/SendAttachment.java";
        // Get system properties
        Properties props = System.getProperties();
        props.put("mail.smtp.host", host);
        props.put("mail.smtps.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        Session session = Session.getInstance(props, null);

        MimeMessage message = new MimeMessage(session);

        message.setFrom(new InternetAddress(from));

        message.setRecipients(Message.RecipientType.TO, toAddress);

        message.setSubject("JavaMail Attachment");

        BodyPart messageBodyPart = new MimeBodyPart();

        messageBodyPart.setText("Here's the file");

        Multipart multipart = new MimeMultipart();

        multipart.addBodyPart(messageBodyPart);

        messageBodyPart = new MimeBodyPart();

        DataSource source = new FileDataSource(filename);

        messageBodyPart.setDataHandler(new DataHandler(source));

        messageBodyPart.setFileName(filename);

        multipart.addBodyPart(messageBodyPart);

        message.setContent(multipart);

        try {
            Transport tr = session.getTransport("smtps");
            tr.connect(host, from, Password);
            tr.sendMessage(message, message.getAllRecipients());
            System.out.println("Mail Sent Successfully");
            tr.close();

        } catch (SendFailedException sfe) {

            System.out.println(sfe);
        }
    }
    public static void main(String args[]){
        try {
            SendMail sm = new SendMail();
        } catch (MessagingException ex) {
            Logger.getLogger(SendMail.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

---

您可以使用用户名和密码访问gmail。但gmail帐户将拒绝访问

因此，您必须通过进入帐户设置、密码部分来更改安全级别，取消验证码安全设置或降低安全级别，具体取决于旧的或最新的gmail应用程序

如果您想通过访问本地目录通过gmail发送附件，那么您需要按照下面程序中的指示使用要设置为DataSource构造函数类的File对象。这将避免“拒绝访问”异常

import java.io.File;    
import java.io.IOException;    
import java.util.Properties;   
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class EmailApp {
    public static void main(String[] args)throws IOException {
        final String username = "mygmail@gmail.com";
        final String password = "mypassword";

        Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.port", "587");

        Session session = Session.getInstance(props, new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });

        try {
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("dharmendrasundar@gmail.com"));
            message.setRecipients(Message.RecipientType.TO,
            InternetAddress.parse("dharmendrasundar@gmail.com"));
            message.setSubject("Testing Subject");
            message.setText("Dear Mail Crawler," + "\n\n No spam to my email, please!");
            message.setSubject("Testing Subject");
            message.setText("PFA");

            MimeBodyPart messageBodyPart = new MimeBodyPart();
            Multipart multipart = new MimeMultipart();
            messageBodyPart = new MimeBodyPart();

            String attachmentPath = "C:/TLS/logs/26-Mar-2015";
            String attachmentName = "LogResults.txt";

            File att = new File(new File(attachmentPath), attachmentName);
            messageBodyPart.attachFile(att);

            DataSource source = new FileDataSource(att);
            messageBodyPart.setDataHandler(new DataHandler(source));
            messageBodyPart.setFileName(attachmentName);
            multipart.addBodyPart(messageBodyPart);
            message.setContent(multipart);

            System.out.println("Sending");
            Transport.send(message);
            Transport.send(message);
            System.out.println("Done");
        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }
}

---

电子邮件由标题和正文部分组成

标题部分将包含from、to和subject

正文包含附件。要支持在车身中携带附件，应存在类型

Multipart

Multipart

对象包含多个部分，其中每个部分都表示为

BodyPart

的一种类型，其子类

MimeBodyPart

可以将文件作为其内容

将附件添加到邮件正文

MimeBodyPart

类提供了一些方便的方法

// JavaMail 1.3
MimeBodyPart attachPart = new MimeBodyPart();
String attachFile = "D:/test.pdf";

DataSource source = new FileDataSource(attachFile);
attachPart.setDataHandler(new DataHandler(source));
attachPart.setFileName(new File(attachFile).getName());

multipart.addBodyPart(attachPart);


// JavaMail 1.4
MimeBodyPart attachPart = new MimeBodyPart();
String attachFile = "D:/test.pdf";
attachPart.attachFile(attachFile);
multipart.addBodyPart(attachPart);

有关更多信息，请参阅此链接