使用java在邮件中发送附件

Question

我可以用Java发送和发送电子邮件，并使用MimeBodyPart附加文件。我发送的附件正在转换为电子邮件正文，文件中的内容正在正文中显示。我的代码中是否有任何错误将附件转换为正文？

// http://www.codejava.net/java-ee/javamail/send-e-mail-with-attachment-in-java

package axisSharePoint;


import java.io.File;
import java.io.IOException;
import java.util.Date;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Authenticator;
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.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class EmailAttachmentSender {

    public static void sendEmailWithAttachments(String host, String port,
            final String userName, final String password, String toAddress,
            String subject, String message, String[] attachFiles)
            throws AddressException, MessagingException {
        // sets SMTP server properties
        Properties properties = new Properties();
        properties.put("mail.smtp.host", host);
        properties.put("mail.smtp.port", port);
        //properties.put("mail.smtp.auth", "true");
        //properties.put("mail.smtp.starttls.enable", "true");
        //properties.put("mail.user", userName);
        //properties.put("mail.password", password);

        // creates a new session with an authenticator
        Authenticator auth = new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(userName, password);
            }
        };
        //Session session = Session.getInstance(properties, auth);
        Session session = Session.getInstance(properties, null);

        // creates a new e-mail message
        Message msg = new MimeMessage(session);

        msg.setFrom(new InternetAddress(userName));
        InternetAddress[] toAddresses = { new InternetAddress(toAddress) };
        msg.setRecipients(Message.RecipientType.TO, toAddresses);
        msg.setSubject(subject);
        msg.setSentDate(new Date());

        // creates message part
        MimeBodyPart messageBodyPart = new MimeBodyPart();
        messageBodyPart.setContent(message, "text/html");

        // creates multi-part
        Multipart multipart = new MimeMultipart();
        multipart.addBodyPart(messageBodyPart);

        // adds attachments
        if (attachFiles != null && attachFiles.length > 0) {
            for (String filePath : attachFiles) {
                MimeBodyPart attachPart = new MimeBodyPart();
                System.out.println(filePath);

                //DataSource  source = new FileDataSource(new 
                                           File(filePath));
                //attachPart.setDataHandler(new DataHandler(source));
                //attachPart.setFileName(filePath);
                try {
                    attachPart.attachFile(new File(filePath));
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                multipart.addBodyPart(attachPart);
            }
        }
        // sets the multi-part as e-mail's content
        msg.setContent(multipart);


        // sends the e-mail
        Transport.send(msg);
    }

    /**
     * Test sending e-mail with attachments
     */
    public static void main(String[] args) {
        // SMTP info
        String host = "*******";
        String port = "25";
        String mailFrom = "*********";
        String password = "";

        // message info
        String mailTo = "*****";
        String subject = "New email with attachments";
        String message = "I have some attachments for you.";

        // attachments
        String[] attachFiles = new String[1];

        attachFiles[0]="SampleFile1.txt";

        try {
            sendEmailWithAttachments(host, port, mailFrom, password, mailTo,
                subject, message, attachFiles);
            System.out.println("Email sent.");
        } catch (Exception ex) {
            System.out.println("Could not send email.");
            ex.printStackTrace();
        }
    }
}

使用以下Maven

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.4.1</version>
</dependency>

以下列格式收到输出：

------=_Part_0_363771819.1499875061651
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit

I have some attachments for you.
------=_Part_0_363771819.1499875061651
Content-Type: text/plain; name=SampleFile1.txt
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename=SampleFile1.txt

This is External File
------=_Part_0_363771819.1499875061651--