java发送邮件附件 java发送邮件添加附件

发送邮件代码：

public void sendEmail(EmailData data) {
        if(data.getAttachmentList().size() <= 0) {
            logger.error("[EmailService] [sendEmail] attachment is empty!!");
            return;
        }

        logger.info("[EmailService] [sendEmail] [form:{}] [pass:{}] [to:{}] [subject:{}]", 
                    data.getFromUser(), data.getFromPass(), data.getToUsers(), data.getSubject());

        Session session = getSession(data.getFromUser(), data.getFromPass());
        MimeMessage message = new MimeMessage(session);

        try {
            //加载发件人地址
            message.setFrom(new InternetAddress(data.getFromUser()));
            //加载收件人地址
            String[] arr = data.getToUsers().split(",");  
            int receiverCount = arr.length;
            if(receiverCount > 0) {
                InternetAddress[] address = new InternetAddress[receiverCount];  
                for (int i = 0; i < receiverCount; i++) {  
                    address[i] = new InternetAddress(arr[i]);
                    logger.info("[EmailService] [sendEmail] [to address:{}]", arr[i]);
                }
                message.addRecipients(Message.RecipientType.TO, address);
            }

            //加载标题
            message.setSubject(data.getSubject());
            //向multipart对象中添加邮件的各个部分内容，包括文本内容和附件
            Multipart multipart = new MimeMultipart();
            //设置邮件的文本内容
            BodyPart contentPart = new MimeBodyPart();
            contentPart.setText("");
            multipart.addBodyPart(contentPart);

            //添加附件信息
            addAttachments(multipart, data.getAttachmentList());
            //将multipart对象放到message中
            message.setContent(multipart);

            //发送邮件
            Transport.send(message);
            logger.info("[EmailService] [sendEmail] [email send success!!]");
        } catch (Exception e) {
            logger.error("", e);
        }
    }

获取Session，并进行验证：

/**
     * 获取Session
     * @param username 发件人邮箱
     * @param password 发件人密码
     * @date 2017年4月13日
     */
    private Session getSession(final String username, final String password) {
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.exmail.qq.com");
        props.put("mail.smtp.port", 465);
        props.put("mail.smtp.auth", "true");

        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
        Session session = Session.getDefaultInstance(props, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });
        session.setDebug(true);
        return session;
    }

添加附件至邮件中：

/**
     * 将附件信息添加至邮件中
     * @param list 
     * @date 2017年4月11日
     */
    private void addAttachments(Multipart multipart, List<Attachment> attachmentList) throws MessagingException {
        for(Attachment attachment : attachmentList) {
            // 添加附件
            BodyPart messageBodyPart = new MimeBodyPart();
            DataSource source = new FileDataSource(attachment.getPath());

            // 添加附件的内容
            messageBodyPart.setDataHandler(new DataHandler(source));

            // 添加附件的标题
            // 这里很重要，通过下面的Base64编码的转换可以保证你的中文附件标题名在发送时不会变成乱码
            sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder();
            messageBodyPart.setFileName("=?GBK?B?" + enc.encode(attachment.getName().getBytes()) + "?=");
            multipart.addBodyPart(messageBodyPart);
        }
    }