Java Mail 发送带附件邮件

@Override
public String sendEmail(Mail mail) {
try{
logger.debug("email props begin...");
// 配置发送邮件的环境属性
final Properties props = new Properties();
// 可用的属性： mail.store.protocol / mail.transport.protocol / mail.host / mail.user / mail.from
// 表示SMTP发送邮件，需要进行身份验证
props.put("mail.smtp.ssl.enable", true);
props.put("mail.smtp.auth", mail.getConfig().getAuth());
props.put("mail.smtp.host", mail.getConfig().getHost());
props.put("mail.smtp.port", mail.getConfig().getPort());
// 发件人的账号
props.put("mail.user", mail.getConfig().getFrom());
// 访问SMTP服务时需要提供的密码
props.put("mail.password", mail.getConfig().getPwd());

logger.debug("email authenticator begin...");
// 构建授权信息，用于进行SMTP进行身份验证
Authenticator authenticator = new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
// 用户名、密码
String userName = props.getProperty("mail.user");
String password = props.getProperty("mail.password");
return new PasswordAuthentication(userName, password);
}
};

// 使用环境属性和授权信息，创建邮件会话
logger.debug("email session begin...");
Session mailSession = Session.getInstance(props, authenticator);
mailSession.setDebug(true);

// 创建邮件消息
logger.debug("email message begin...");
MimeMessage message = new MimeMessage(mailSession);

// 设置发件人
logger.debug("email from begin...");
InternetAddress form = new InternetAddress(props.getProperty("mail.user"));
message.setFrom(form);

// 设置收件人
logger.debug("email to begin...");
InternetAddress to = new InternetAddress(mail.getConfig().getTo());
message.setRecipient(Message.RecipientType.TO, to);

// 设置抄送
if(!Utility.isEmpty(mail.getConfig().getCc())){
logger.debug("email cc begin...");
InternetAddress cc = new InternetAddress(mail.getConfig().getCc());
message.setRecipient(Message.RecipientType.CC, cc);
}

// 设置邮件标题
logger.debug("email subject begin...");
message.setSubject(mail.getSubject());

// 设置邮件的内容体
logger.debug("email content begin...");
Multipart multipart = new MimeMultipart();
BodyPart contentPart = new MimeBodyPart();
contentPart.setContent(mail.getContent(), "text/html;charset=UTF-8");
multipart.addBodyPart(contentPart);

if (mail.getAttachment() != null) {
BodyPart attachmentBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource(mail.getAttachment());
attachmentBodyPart.setDataHandler(new DataHandler(source));

// 网上流传的解决文件名乱码的方法，其实用MimeUtility.encodeWord就可以很方便的搞定
// 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()) + "?=");

//MimeUtility.encodeWord可以避免文件名乱码
attachmentBodyPart.setFileName(MimeUtility.encodeWord(mail.getAttachment().getName()));
multipart.addBodyPart(attachmentBodyPart);
}
message.setContent(multipart);

// 发送邮件
logger.debug("email send message begin...");
Transport.send(message);

}catch (Exception e){
logger.debug("email exception e:{}", e.getMessage());
return e.getMessage();
}finally {
logger.debug("email send message end!");
}
return "success";
}