java - 使用jsp发送邮件和附件文件

我想使用jsp发送电子邮件。
我已经开发了这个小代码来发送电子邮件。
我已经添加了所有需要的库
Java邮件API和JAF。但仍然无法正常工作。
我不知道这是怎么回事。
它显示我错误：无法发送消息。

<%@ page import="java.io.*,java.util.*,javax.mail.*"%>
<%@ page import="javax.mail.internet.*,javax.activation.*"%>
<%@ page import="javax.servlet.http.*,javax.servlet.*" %>
<% String result;
   String to = "kudale.ashish1992@gmail.com";
   String from = "kudale.ashish1992@yahoo.com";
   String host = "smtp.mail.yahoo.com";
   Properties properties = System.getProperties();
   properties.setProperty("mail.smtp.host", host);
   properties.setProperty("mail.user", "Username");
   properties.setProperty("mail.password", "Paasword");
   //String to = request.getParameter("to");
   //String from = request.getParameter("from");
   String subject = request.getParameter("subject");
   String messageText = request.getParameter("body");
   Session mailSession = Session.getDefaultInstance(properties);
   try{
       MimeMessage message = new MimeMessage(mailSession);
       message.setFrom(new InternetAddress(from));
       message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
       BodyPart messageBodyPart = new MimeBodyPart();
       messageBodyPart.setText("This is message body");
       Multipart multipart = new MimeMultipart();
       multipart.addBodyPart(messageBodyPart);
       messageBodyPart = new MimeBodyPart();
       String filename = "file.txt";
       DataSource source = new FileDataSource(filename);
       messageBodyPart.setDataHandler(new DataHandler(source));
       messageBodyPart.setFileName(filename);
       multipart.addBodyPart(messageBodyPart);
       message.setContent(multipart );
       Transport.send(message);
       String title = "Send Email";
       result = "Sent message successfully....";
    }
    catch (MessagingException mex) {
       mex.printStackTrace();
       result = "Error: unable to send message....";
   }
 %>
<html>
<head>
<title>Send email</title>
</head>
<body>
<center> <h1>Send Attachement Email using JSP</h1> </center>
<p align="center">
<% out.println("Result: " + result + "\n"); %>
</p>
</body>
</html>

最佳答案

我已经在我的机器上尝试了这两个错误。

首先，您在这里拼错了properties

roperties.setProperty("mail.password", "Paasword");

其次，file.txt的访问被拒绝错误。我设法提供了一条途径，并且成功了。

结果：显示我的消息发送成功。

<%@ page import="java.io.*,java.util.*,javax.mail.*"%>
<%@ page import="javax.mail.internet.*,javax.activation.*"%>
<%@ page import="javax.servlet.http.*,javax.servlet.*" %>
<% String result;
   String to = "kudale.ashish1992@gmail.com";
   String from = "kudale.ashish1992@yahoo.com";
   String host = "localhost";
   Properties properties = System.getProperties();
   properties.setProperty("mail.smtp.host", host);
   properties.setProperty("mail.user", "Username");
   properties.setProperty("mail.password", "Paasword");
   //String to = request.getParameter("to");
   //String from = request.getParameter("from");
   String subject = request.getParameter("subject");
   String messageText = request.getParameter("body");
   Session mailSession = Session.getDefaultInstance(properties);
   try{
       MimeMessage message = new MimeMessage(mailSession);
       message.setFrom(new InternetAddress(from));
       message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
       BodyPart messageBodyPart = new MimeBodyPart();
       messageBodyPart.setText("This is message body");
       Multipart multipart = new MimeMultipart();
       multipart.addBodyPart(messageBodyPart);
       messageBodyPart = new MimeBodyPart();
       String filename = "file.txt";
       DataSource source = new FileDataSource(filename);
       messageBodyPart.setDataHandler(new DataHandler(source));
       messageBodyPart.setFileName(filename);
       multipart.addBodyPart(messageBodyPart);
       message.setContent(multipart );
       Transport.send(message);
       String title = "Send Email";
       result = "Sent message successfully....";
    }
    catch (MessagingException mex) {
       mex.printStackTrace();
       result = "Error: unable to send message....";
   }
 %>
<html>
<head>
<title>Send email</title>
</head>
<body>
<center> <h1>Send Attachement Email using JSP</h1> </center>
<p align="center">
<% out.println("Result: " + result + "\n"); %>
</p>
</body>
</html>