java使用servlet在JSP中发送邮件

Question

我需要的邮件程序，必须与所有类型的主机发送。我使用过smtp，但它只支持gmail。在我的项目中，邮件必须通过公司登录发送。可能有很多公司登录，他们可能有不同类型的邮件帐户。。。我必须编写一个程序来支持所有类型的邮件帐户

package com.admin;

/**
 *
 * @author asp.net
 */
import java.util.Date;
import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

/**
 * A utility class for sending e-mail messages
 * @author www.codejava.net
 *
 */
public class EmailUtility {
    public static void sendEmail(String host, String port,
            final String userName, final String password, String toAddress,
            String subject, String message) throws AddressException,
            MessagingException {

        // sets SMTP server properties
        Properties properties = new Properties();
        properties.put("mail.smtp.host", host);
        properties.put("mail.smtp.port", port);
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true");
        properties.put("mail.transport.protocol", "smtp") ;

        // creates a new session with an authenticator
        Authenticator auth = new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(userName, password);
            }
        };

        Session session = Session.getInstance(properties, auth);

        // creates a new e-mail message
        Message msg = new MimeMessage(session);

        msg.setFrom(new InternetAddress(userName));
        InternetAddress[] toAddresses = { new InternetAddress(toAddress) };
        msg.setRecipients(Message.RecipientType.TO, toAddresses);
        msg.setSubject(subject);
        msg.setSentDate(new Date());
        msg.setText(message);

        // sends the e-mail
        Transport.send(msg);

    }
}

Answer 1

下面是令人惊叹的代码。我已经在Centos 6上测试过了

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Properties;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;

@WebServlet(name = "SendMail", urlPatterns = {"/SendMail"})
public class SendMail extends HttpServlet {

    public final String from = "from@gmail.com";
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
          // Recipient's email ID needs to be mentioned.
      String to = "to@gmail.com";
     // Sender's email ID needs to be mentioned


      // Assuming you are sending email from localhost
      String host = "smtp.gmail.com";

      // Get system properties
        Properties properties = System.getProperties();

      // Setup mail server
    //  properties.setProperty("mail.smtp.host", host);


                properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true");
        properties.put("mail.smtp.host", "smtp.gmail.com");

        properties.put("mail.smtp.port", "587");

      // Get the default Session object. 
                Session session ;

                session = Session.getInstance(properties,
                new javax.mail.Authenticator() {

                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(from, "password");
                    }
                });

        session.setDebug(true);


      try{
         // Create a default MimeMessage object.
          MimeMessage  message = new MimeMessage(session);

         // Set From: header field of the header.
         message.setFrom(new InternetAddress(from));

         // Set To: header field of the header.
         message.addRecipient(Message.RecipientType.TO,
                                  new InternetAddress(to));

         // Set Subject: header field
         message.setSubject("This is the Subject Line!");

         // Now set the actual message
         message.setText("This is actual message");

         // Send message
         Transport.send(message);
         System.out.println("Sent message successfully....");
      }catch (MessagingException mex) {
         mex.printStackTrace();
      }
    }



}

这是一个servlet，您可以将此代码更改为类，如果您想要，您不能将文件传递给该类的函数