使用JavaMail实现发送模板邮件以及保存到发件箱

需要用到的jar包
1.freemarker-2.3.19.jar
2.javax.mail.jar
3.javax.activation.jar

本次测试邮箱是腾讯企业邮箱，其他未经测试。
做这个功能是因为我女朋友每个月都需要手动去发几十个人的考勤、考核邮件，实在是太过重复的做一件很乏味的事情，所以才有了这个程序，不过，界面是使用的控制台，简单一点。

核心代码展示

/** * 发送邮件 * @author hezhao * @Time 2017年3月13日 上午11:25:15 */
    public void send() {
        System.out.println("正在发送邮件至:::["+to+"] ...");

        // 设置邮件服务器
        Properties prop = System.getProperties();
        prop.put("mail.smtp.host", stmpmailServer);
        prop.put("mail.smtp.auth", "true");
        prop.put("mail.transport.protocol", this.send);
        prop.put("mail.smtp.socketFactory.class",
                "javax.net.ssl.SSLSocketFactory");
        prop.put("mail.smtp.socketFactory.port", this.smtpport);
        prop.put("mail.smtp.socketFactory.fallback", "false");

        // 使用SSL，企业邮箱必需！
        // 开启安全协议
        MailSSLSocketFactory sf = null;
        try {
            sf = new MailSSLSocketFactory();
            sf.setTrustAllHosts(true);
        } catch (GeneralSecurityException e1) {
            e1.printStackTrace();
        }
        prop.put("mail.smtp.starttls.enable", "true");
        prop.put("mail.smtp.ssl.socketFactory", sf);

        // 获取Session对象
        Session session = Session.getDefaultInstance(prop, new Authenticator() {
            // 此访求返回用户和密码的对象
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                PasswordAuthentication pa = new PasswordAuthentication(username,
                        password);
                return pa;
            }
        });
        // 设置session的调试模式，发布时取消
        session.setDebug(true);

        try {
            // 封装Message对象
            Message message = new MimeMessage(session);
            // message.setFrom(new InternetAddress(from,from)); //设置发件人

            // 设置自定义发件人昵称
            String nick_from = "";
            try {
                nick_from = javax.mail.internet.MimeUtility.encodeText(this.nickname_from);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            message.setFrom(new InternetAddress(nick_from + " <" + from + ">"));

            // 设置自定义收件人昵称
            String nick_to = "";
            try {
                nick_to = javax.mail.internet.MimeUtility.encodeText(this.nickname_to);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            message.setRecipient(Message.RecipientType.TO, new InternetAddress(nick_to + " <" + to + ">"));// 设置收件人
            message.setSubject(mailSubject);// 设置主题
            message.setContent(mailContent, "text/html;charset=utf8");// 设置内容(设置字符集处理乱码问题)
            message.setSentDate(new Date());// 设置日期

            // 发送
            Transport.send(message);
            System.out.println("发送成功...");

            //保存邮件到发件箱
            saveEmailToSentMailFolder(message);

            if(mailSubject.contains("考勤")){
                FileLog.writeLog(this.nickname_to + " <" + to + ">发送成功");
            }else{
                FileLog.writeLog(this.nickname_to + " <" + to + ">发送成功");
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("发送邮件异常...");

            if(mailSubject.contains("考勤")){
                FileLog.writeLog(this.nickname_to + " <" + to + ">发送失败");
            }else{
                FileLog.writeLog(this.nickname_to + " <" + to + ">发送失败");
            }
        }
    }

保存至发件箱

/** * 获取用户的发件箱文件夹 * * @param message * 信息 * @param store * 存储 * @return * @throws IOException * @throws MessagingException */
    private Folder getSentMailFolder(Message message, Store store)
            throws IOException, MessagingException {
        // 准备连接服务器的会话信息
        Properties props = new Properties();
        props.setProperty("mail.store.protocol", get);
        props.setProperty("mail.imap.host", imapmailServer);
        props.setProperty("mail.imap.port", "143");

        /** QQ邮箱需要建立ssl连接 */
        props.setProperty("mail.imap.socketFactory.class",
                "javax.net.ssl.SSLSocketFactory");
        props.setProperty("mail.imap.socketFactory.fallback", "false");
        props.setProperty("mail.imap.starttls.enable", "true");
        props.setProperty("mail.imap.socketFactory.port", imapport);

        // 创建Session实例对象
        Session session = Session.getInstance(props);
        URLName urln = new URLName(get, imapmailServer, 143, null,
                username, password);
        // 创建IMAP协议的Store对象
        store = session.getStore(urln);
        store.connect();

        // 获得发件箱
        Folder folder = store.getFolder("Sent Messages");
        // 以读写模式打开发件箱
        folder.open(Folder.READ_WRITE);

        return folder;
    }

    /** * 保存邮件到发件箱 * * @param message * 邮件信息 */
    private void saveEmailToSentMailFolder(Message message) {

        Store store = null;
        Folder sentFolder = null;
        try {
            sentFolder = getSentMailFolder(message, store);
            message.setFlag(Flag.SEEN, true); // 设置已读标志
            sentFolder.appendMessages(new Message[] { message });

            System.out.println("已保存到发件箱...");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {

            // 判断发件文件夹是否打开如果打开则将其关闭
            if (sentFolder != null && sentFolder.isOpen()) {
                try {
                    sentFolder.close(true);
                } catch (MessagingException e) {
                    e.printStackTrace();
                }
            }
            // 判断邮箱存储是否打开如果打开则将其关闭
            if (store != null && store.isConnected()) {
                try {
                    store.close();
                } catch (MessagingException e) {
                    e.printStackTrace();
                }
            }
        }
    }

获取模板内容

   /** * 得到模板内容 * @author hezhao * @Time 2017年3月13日 下午1:01:08 * @param fileName * @param map * @return */
    public String getMailText(String fileName,Map<String,Object> map){
        String htmlText = null;
        try {
            Template template = config.getTemplate(fileName);
            htmlText = FreeMarkerTemplateUtils.processTemplateIntoString(template, map);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (TemplateException e) {
            e.printStackTrace();
        }
        return htmlText;
    }

替换模板内容

FreemarkerUtil freemarkerUtil = null;
try {
     freemarkerUtil = (FreemarkerUtil) context.getBean("freemarkerUtil");
} catch (Exception e) {
    System.out.println("出现异常！！！");
    e.printStackTrace();
}           
String mailContent = freemarkerUtil.getMailText(fileName, map);

HTML模板（这个还是景洲帮我实现的）

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
    </head>
    <style> table{ border-collapse:collapse; text-align: center;font-size:12px;} .yellow{ background: #FFFF00;} .blod{ font-weight: bold;} </style>
    <body>
    <table width="1160" border="1">
      <tr>
        <td colspan="11" align="center" style="font-size: 22px;">${title}</td>
      </tr>
      <tr>
        <td rowspan="2" class="yellow">序号</td>
        <td rowspan="2" class="yellow">部门</td>
        <td rowspan="2" class="yellow">姓名</td>
        <td rowspan="2" class="yellow">入职时间</td>
        <td colspan="5" class="blod" style="font-size: 14px;">考勤结果汇总</td>
        <td> </td>
        <td rowspan="2" >备注</td>
      </tr>
      <tr>
        <td>正常出勤</td>
        <td>请假小时</td>
        <td>迟到分钟</td>
        <td>迟到扣款</td>
        <td>旷工天数</td>
        <td>休年假天数</td>
      </tr>
      <tr>
        <td>${no}</td>
        <td>${dept}</td>
        <td>${name}</td>
        <td>${intotime}</td>
        <td class="yellow blod">${workday}</td>
        <td class="blod">${outhour}</td>
        <td class="blod">${deletemin}</td>
        <td class="blod">${deletemoney}</td>
        <td class="blod">${kg}</td>
        <td class="blod">${year}</td>
        <td>${remark}</td>
      </tr>
    </table>

    <div>
        <br />
    </div>

    <hr style="width: 210px; height: 1px;" color="#b5c4df" size="1" align="left">

    <div style="font-size: 14px;font-family: 'lucida Grande', Verdana;">
        <span>${bottom}</span>
    </div>

    </body>
</html>