使用JavaMail實現發送模板郵件以及保存到發件箱

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

本次測試郵箱是騰訊企業郵箱，其他未經測試。
做這個功能是因爲我女朋友每個月都需要手動去發幾十個人的考勤、考覈郵件，實在是太過重複的做一件很乏味的事情，所以纔有了這個程序，不過，界面是使用的控制檯，簡單一點。

核心代碼展示

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

        // 設置郵件服務器
        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，企業郵箱必需！
        // 開啓安全協議
        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);

        // 獲取Session對象
        Session session = Session.getDefaultInstance(prop, new Authenticator() {
            // 此訪求返回用戶和密碼的對象
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                PasswordAuthentication pa = new PasswordAuthentication(username,
                        password);
                return pa;
            }
        });
        // 設置session的調試模式，發佈時取消
        session.setDebug(true);

        try {
            // 封裝Message對象
            Message message = new MimeMessage(session);
            // message.setFrom(new InternetAddress(from,from)); //設置發件人

            // 設置自定義發件人暱稱
            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 + ">"));

            // 設置自定義收件人暱稱
            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 + ">"));// 設置收件人
            message.setSubject(mailSubject);// 設置主題
            message.setContent(mailContent, "text/html;charset=utf8");// 設置內容(設置字符集處理亂碼問題)
            message.setSentDate(new Date());// 設置日期

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

            //保存郵件到發件箱
            saveEmailToSentMailFolder(message);

            if(mailSubject.contains("考勤")){
                FileLog.writeLog(this.nickname_to + " <" + to + ">發送成功");
            }else{
                FileLog.writeLog(this.nickname_to + " <" + to + ">發送成功");
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("發送郵件異常...");

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

保存至發件箱

/**
     * 獲取用戶的發件箱文件夾
     * 
     * @param message
     *            信息
     * @param store
     *            存儲
     * @return
     * @throws IOException
     * @throws MessagingException
     */
    private Folder getSentMailFolder(Message message, Store store)
            throws IOException, MessagingException {
        // 準備連接服務器的會話信息
        Properties props = new Properties();
        props.setProperty("mail.store.protocol", get);
        props.setProperty("mail.imap.host", imapmailServer);
        props.setProperty("mail.imap.port", "143");

        /** QQ郵箱需要建立ssl連接 */
        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);

        // 創建Session實例對象
        Session session = Session.getInstance(props);
        URLName urln = new URLName(get, imapmailServer, 143, null,
                username, password);
        // 創建IMAP協議的Store對象
        store = session.getStore(urln);
        store.connect();

        // 獲得發件箱
        Folder folder = store.getFolder("Sent Messages");
        // 以讀寫模式打開發件箱
        folder.open(Folder.READ_WRITE);

        return folder;
    }

    /**
     * 保存郵件到發件箱
     * 
     * @param message
     *            郵件信息
     */
    private void saveEmailToSentMailFolder(Message message) {

        Store store = null;
        Folder sentFolder = null;
        try {
            sentFolder = getSentMailFolder(message, store);
            message.setFlag(Flag.SEEN, true); // 設置已讀標誌
            sentFolder.appendMessages(new Message[] { message });

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

            // 判斷髮件文件夾是否打開如果打開則將其關閉
            if (sentFolder != null && sentFolder.isOpen()) {
                try {
                    sentFolder.close(true);
                } catch (MessagingException e) {
                    e.printStackTrace();
                }
            }
            // 判斷郵箱存儲是否打開如果打開則將其關閉
            if (store != null && store.isConnected()) {
                try {
                    store.close();
                } catch (MessagingException e) {
                    e.printStackTrace();
                }
            }
        }
    }

獲取模板內容

   /**
     * 得到模板內容
     * @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;
    }

替換模板內容

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

HTML模板（這個還是景洲幫我實現的）

<!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;">${title}</td>
      </tr>
      <tr>
        <td rowspan="2" class="yellow">序號</td>
        <td rowspan="2" class="yellow">部門</td>
        <td rowspan="2" class="yellow">姓名</td>
        <td rowspan="2" class="yellow">入職時間</td>
        <td colspan="5" class="blod" style="font-size: 14px;">考勤結果彙總</td>
        <td> </td>
        <td rowspan="2" >備註</td>
      </tr>
      <tr>
        <td>正常出勤</td>
        <td>請假小時</td>
        <td>遲到分鐘</td>
        <td>遲到扣款</td>
        <td>曠工天數</td>
        <td>休年假天數</td>
      </tr>
      <tr>
        <td>${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>