Java-从jsp页面发送电子邮件

Question

我的Web应用程序上有一个简单的JSP页面，如下所示：

输入收件人电子邮件，主题和内容后，用户可以在下方按下按钮。

我想实现一个允许用户向外人发送电子邮件的功能。我想到的是使用带有SMTP的Java Mail API。

所以，在我的后端代码中，我编写了一个如下所示的函数：

public String sendEmail(ArrayList mediaList, String authRequired, String TLSEnabled, String SSLEnabled, String smtpHost, String senderAddress, String portNumber, String user, String password,
                            String msgSubject, String msgContent,
                            ArrayList toRecipientAdd, ArrayList ccRecipientAdd, ArrayList bccRecipientAdd) {
        try {

            final String SenderAddress = senderAddress;
            final String Username = user;
            final String Password = password;


            System.out.println("Please Wait, sending email...");

            if (toRecipientAdd.size() == 0) {
                System.out.println("NO USER FOUND IN TORECIPIENT ADDRESS.");
                return "NO USER FOUND IN TORECIPIENT ADDRESS.";
            }

            if (msgSubject.equals("")) {
                System.out.println("MESSAGE SUBJECT NOT FOUND.");
                return "MESSAGE SUBJECT NOT FOUND.";
            }

            if (msgContent.equals("")) {
                System.out.println("MESSAGE CONTENT NOT FOUND.");
                return "MESSAGE CONTENT NOT FOUND.";
            }



            /*Setup mail server */

            Properties props = new Properties();
            props.put("mail.transport.protocol", "smtp");
            props.put("mail.smtp.auth", authRequired);
            props.put("mail.smtp.host", smtpHost);
            props.put("mail.smtp.port", portNumber);
            props.put("mail.smtp.starttls.enable", TLSEnabled);
            props.put("mail.smtp.ssl.trust", SSLEnabled);

            String auth_enable = authRequired;
            final String username = user;
            final String upassword = password;

            System.out.println("mail.smtp.host : " + smtpHost + " mail.smtp.port : " + portNumber);

            // Get session
            Session session = Session.getDefaultInstance(props, null);

            if(Boolean.parseBoolean(auth_enable)){
                session = Session.getInstance(props,
                        new javax.mail.Authenticator() {

                            protected PasswordAuthentication getPasswordAuthentication() {
                                return new PasswordAuthentication(username, upassword);
                            }
                        });
            }

            session.setDebug(true);



            // Define message
            MimeMessage message = new MimeMessage(session);
            InternetAddress senderInetAddress = null;
            try {
                senderInetAddress = new InternetAddress(senderAddress);
            } catch (AddressException addressException) {
                addressException.printStackTrace();
            }

            // Set From Sender Address
            message.setFrom(senderInetAddress);

            // TO Recipient
            Iterator itr = toRecipientAdd.iterator();
            while (itr.hasNext()) {
                String receiverAddr = (String) itr.next();

                System.out.println("receiverAddr : " + receiverAddr);

                InternetAddress receiverInetAddress;
                try {
                    receiverInetAddress = new InternetAddress(receiverAddr);
                } catch (AddressException addressException) {
                    addressException.printStackTrace();
                    continue;
                }
                message.addRecipient(Message.RecipientType.TO, receiverInetAddress);
            }

            // CC Recipient
            Iterator i = ccRecipientAdd.iterator();
            while (i.hasNext()) {
                String ccAddr = (String) i.next();
                InternetAddress ccInetAddress = null;
                try {
                    ccInetAddress = new InternetAddress(ccAddr);
                } catch (AddressException addressException) {
                    addressException.printStackTrace();
                    continue;
                }
                message.addRecipient(Message.RecipientType.CC, ccInetAddress);
            }

            // BCC Recipient
            Iterator j = bccRecipientAdd.iterator();
            while (j.hasNext()) {
                String bccAddr = (String) j.next();
                InternetAddress bccInetAddress = null;
                try {
                    bccInetAddress = new InternetAddress(bccAddr);
                } catch (AddressException addressException) {
                    addressException.printStackTrace();
                    continue;
                }
                message.addRecipient(Message.RecipientType.BCC, bccInetAddress);
            }


            message.setSubject(msgSubject);

            Multipart mp = new MimeMultipart();
            MimeBodyPart htmlPart = new MimeBodyPart();

            htmlPart.setHeader("Content-Transfer-Encoding", "base64");
            htmlPart.setContent(msgContent, "text/html; charset=ISO-8859-1");
            htmlPart.setDisposition(javax.mail.Part.INLINE);
            mp.addBodyPart(htmlPart);

            Iterator mediaIter = mediaList.iterator();
            while(mediaIter.hasNext()){
                Fmedia fmedia = (Fmedia) mediaIter.next();
                DataSource fds = new FileDataSource(fmedia.getFfulpath() + "/" + fmedia.getFgname());

                MimeBodyPart imagePart = new MimeBodyPart();
                imagePart.setDataHandler(new DataHandler(fds));

                // assign a cid to the image
                imagePart.setHeader("Content-Transfer-Encoding", "base64");
                imagePart.addHeader("Content-ID", "<img" + fmedia.getNodeid() + ">");
                imagePart.setDisposition(javax.mail.Part.INLINE);

                mp.addBodyPart(imagePart);
            }

            message.setContent(mp);

            System.out.println("Sending.... ");

            // Send the message
            try{

                Transport.send(message, message.getAllRecipients());
                System.out.println("Message sent.");

            }catch(Exception e){
                e.printStackTrace();
                System.out.println("Exception " + e.getMessage());
            }
            return "";
        } catch (Exception e) {
            System.out.println(e.getMessage());
            return e.getMessage();
        }
    }

但是，我仍然不熟悉Java中的SMTP，并且不知道props中应该指定的值是什么，而且因为我没有硬编码Mimemessage，所以我需要从JSP页面获取值，如上所示。

这可能吗？

Answer 1

你在道具中设置了一些参数，比如

Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.port", "587");

如果您需要进一步说明，请参阅下面的示例代码，

import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SendMailSSL {
    public static void main(String[] args) {
    Properties props = new Properties();
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.socketFactory.port", "465");
    props.put("mail.smtp.socketFactory.class",
            "javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.port", "465");

    Session session = Session.getDefaultInstance(props,
        new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("username","password");
            }
        });

    try {

        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("[email protected]"));
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse("[email protected]"));
        message.setSubject("Testing Subject");
        message.setText("Dear Mail Crawler," +
                "\n\n No spam to my email, please!");

        Transport.send(message);

        System.out.println("Done");

    } catch (MessagingException e) {
        throw new RuntimeException(e);
    }
}

}

此外，您可以将任何参数传递给sendEmail方法，并在代码上使用这些值。