目前研究一下使用Java发送带有附件的邮件，从网上搜索了一下发现都存在各种各样的问题。在这里总结一下，展示一下基础代码，防止遗忘。

代码

public static boolean sendMailpublic static boolean sendMail(String subject, String toMail,
			String content, String... files) {
		boolean isFlag = false;
		try {

			String smtpFromMail = "你的QQ号码@qq.com"; // 账号
			String pwd = "QQ上面申请的授权码"; // 密码
			int port = 465; // 端口
			String host = "smtp.qq.com"; // 端口

			Properties props = new Properties();
			props.put("mail.smtp.host", host);
			props.setProperty("mail.smtp.socketFactory.class",
					"javax.net.ssl.SSLSocketFactory");
			props.put("mail.smtp.auth", "true");
			Session session = Session.getDefaultInstance(props);
			session.setDebug(false);

			MimeMessage message = new MimeMessage(session);
			try {
				message.setFrom(new InternetAddress(smtpFromMail, "QQ邮件测试"));
				message.addRecipient(Message.RecipientType.TO,
						new InternetAddress(toMail));
				message.setSubject(subject);
				message.addHeader("charset", "UTF-8");

				/* 添加正文内容 */
				Multipart multipart = new MimeMultipart();
				BodyPart contentPart = new MimeBodyPart();
				contentPart.setText(content);

				contentPart.setHeader("Content-Type",
						"text/html; charset=UTF-8");
				multipart.addBodyPart(contentPart);

				/* 添加附件 */
				for (String file : files) {
					File usFile = new File(file);
					MimeBodyPart fileBody = new MimeBodyPart();
					DataSource source = new FileDataSource(file);
					fileBody.setDataHandler(new DataHandler(source));
					sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder();
					fileBody.setFileName("=?GBK?B?"
							+ enc.encode(usFile.getName().getBytes()) + "?=");
					multipart.addBodyPart(fileBody);
				}

				message.setContent(multipart);
				message.setSentDate(new Date());
				message.saveChanges();
				Transport transport = session.getTransport("smtp");

				transport.connect(host, port, smtpFromMail, pwd);
				transport.sendMessage(message, message.getAllRecipients());
				transport.close();
				isFlag = true;
			} catch (Exception e) {
				isFlag = false;
				e.printStackTrace();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return isFlag;
	}

	public static void main(String[] args) {
		boolean res = Main.sendMail("这是一封测试邮件", "想要发送的邮件地址",
				"朋友好久不见", "附件路径");
		System.out.println("Resuylt: " + res);
	}

注

1. 使用Java客户端配置QQ邮箱发送邮件，需要现在QQ邮箱网页上申请授权码，发送邮件时放在密码的位置；
2. 特别需要注意发送邮件的标题、正文内容的编码格式问题，不然容易造成乱码现象。