java发送邮件

/**
 * 获取邮箱信息
 * 耿直
 * qq：1293443962
 */
public class JavaMailWithAttachment {
    private MimeMessage message;
    private Session session;
    private Transport transport;

    private String mailHost = "";
    private String sender_username = "";
    private String sender_password = "";

    private Properties properties = new Properties();

    /*
     * 初始化方法
     */
    public JavaMailWithAttachment(boolean debug) throws GeneralSecurityException {
        this.mailHost = properties.getProperty("mail.smtp.host", "smtp.qq.com");
        this.sender_username = properties.getProperty("mail.sender.username", "发邮件的qq邮箱@qq.com");
        this.sender_password = properties.getProperty("mail.sender.password", "到发邮件的QQ邮箱里申请");
        MailSSLSocketFactory sf = null;
        try {
            sf = new MailSSLSocketFactory();
            sf.setTrustAllHosts(true);
        } catch (GeneralSecurityException e1) {
            e1.printStackTrace();
        }
        properties.put("mail.smtp.ssl.enable", "true");
        properties.put("mail.smtp.ssl.socketFactory", sf);

        properties.setProperty("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        properties.setProperty("mail.smtp.port", "465");
        properties.setProperty("mail.smtp.socketFactory.port", "465");
        session = Session.getInstance(properties);
        session.setDebug(debug);// 开启后有调试信息
        message = new MimeMessage(session);
    }

    /**
     * 发送邮件
     *
     * @param subject     邮件主题
     * @param sendHtml    邮件内容
     * @param receiveUser 收件人地址
     * @param attachment  附件
     */
    public boolean doSendHtmlEmail(String subject, String sendHtml, String receiveUser, File attachment) {
        boolean flag = false;
        try {
            // 发件人
            InternetAddress from = new InternetAddress(sender_username);
            message.setFrom(from);

            // 收件人
            InternetAddress to = new InternetAddress(receiveUser);
            message.setRecipient(Message.RecipientType.TO, to);

            // 邮件主题
            message.setSubject(subject);

            // 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();

            // 添加邮件正文
            BodyPart contentPart = new MimeBodyPart();
            contentPart.setContent(sendHtml, "text/html;charset=UTF-8");
            multipart.addBodyPart(contentPart);

            // 添加附件的内容
            if (attachment != null) {
                BodyPart attachmentBodyPart = new MimeBodyPart();
                DataSource source = new FileDataSource(attachment);
                attachmentBodyPart.setDataHandler(new DataHandler(source));
                attachmentBodyPart.setFileName(MimeUtility.encodeWord(attachment.getName()));
                multipart.addBodyPart(attachmentBodyPart);
            }

            // 将multipart对象放到message中
            message.setContent(multipart);
            // 保存邮件
            message.saveChanges();

            transport = session.getTransport("smtp");
            // smtp验证，就是你用来发邮件的邮箱用户名密码
            transport.connect(mailHost, sender_username, sender_password);
            // 发送
            transport.sendMessage(message, message.getAllRecipients());
            flag = true;
            System.out.println("send success!");
        } catch (Exception e) {
            e.printStackTrace();
            flag = false;
        } finally {
            if (transport != null) {
                try {
                    transport.close();
                } catch (MessagingException e) {
                    e.printStackTrace();
                }
            }
        }
        return flag;
    }