JSP Standard Tag Library (JSTL)JSP Auto Refresh

JSP Send Email

Although it is very simple to implement email sending functionality using JSP, it requires the JavaMail API and the installation of JavaBean Activation Framework.

You can download the latest version from the Java website JavaMail, there is a Downloads link, click it to download.
You can download the latest version from the Java website JAF (version 1.1.1).

Download and unzip these files. In the root directory, you will see a series of jar packages. Add the mail.jar package and the activation.jar package to the CLASSPATH variable.

Send a simple email

This example demonstrates how to send a simple email from your machine. It assumes that localhost is connected to the network and capable of sending an email. At the same time, please confirm once again that the mail.jar package and the activation.jar package have been added to the CLASSPATH variable.

<%@ page import="java.io."*,java.util.*,javax.mail.*"%>
<%@ page import="javax.mail.internet."*,javax.activation.*"%>
<%@ page import="javax.servlet.http."*,javax.servlet.*"%>
<%
　　　String result;
　　　//　The recipient's email
　　　String to = "[email protected]";
　　　//　The sender's email
　　　String from = "[email protected]";
　　　//　Assuming you are sending an email from the local host
　　　String host = "localhost";
　　　//　Get the system properties object
　　　Properties properties = System.getProperties();
　　　//　Set the mail server
　　　properties.setProperty("mail.smtp.host", host);
　　　//　Get the default Session object.
　　　Session mailSession = Session.getDefaultInstance(properties);
　　　try{
　　　　　　//　Create a default MimeMessage object.
　　　　　　MimeMessage message = new MimeMessage(mailSession);
　　　　　　//　Set From: header field
　　　　　　message.setFrom(new InternetAddress(from));
　　　　　　//　Set To: header field
　　　　　　message.addRecipient(Message.RecipientType.TO,
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　new InternetAddress(to));
　　　　　　//　Set Subject: header field
　　　　　　message.setSubject("This is the Subject Line!");
　　　　　　//　The actual message set now
　　　　　　message.setText("This is actual message");
　　　　　　//　Send message
　　　　　　Transport.send(message);
　　　　　　result = "Sent message successfully....";
　　　}catch (MessagingException mex) {
　　　　　　mex.printStackTrace();
　　　　　　result = "Error: unable to send message....";
　　　}
%>
<html>
<head>
<title>Send Email using JSP</title>/title>
</head>
<body>
<center>
<h1>Send Email using JSP</h1>
</center>
<p align="center">
<%　
　　　out.println("Result: "　+　result　+　"\n");
%>
</p>
</body>
</html>

Now access http://localhost:8080/SendEmail.jsp, it will send an email to [email protected] and display the following result:

Send Email using JSP
Result: Sent message successfully....

If you want to send an email to multiple people, the following methods can be used to specify multiple email addresses:

void addRecipients(Message.RecipientType type,　
　　　　　　　　　　　　　　　　　　　Address[] addresses)
throws MessagingException

The description of the parameters is as follows:

type: This value will be set to TO (recipient), CC, or BCC. CC stands for Carbon Copy (cc), and BCC stands for Blind Carbon Copy (blind cc). The TO is used in the example program.
addresses: This is an array of email addresses, and the InternetAddress() method needs to be used when specifying an email address.

Send an HTML email

This example sends a simple HTML email. It assumes that your localhost is connected to the network and capable of sending emails. At the same time, please confirm once again that the mail.jar package and the activation.jar package have been added to the CLASSPATH variable.

This example is very similar to the previous one, but in this example, we use the setContent() method, passing "text"/html" as the second parameter to indicate that the message contains HTML content.

<%@ page import="java.io."*,java.util.*,javax.mail.*"%>
<%@ page import="javax.mail.internet."*,javax.activation.*"%>
<%@ page import="javax.servlet.http."*,javax.servlet.*"%>
<%
　　　String result;
　　　//　The recipient's email
　　　String to = "[email protected]";
　　　//　The sender's email
　　　String from = "[email protected]";
　　　//　Assuming you are sending an email from the local host
　　　String host = "localhost";
　　　//　Get the system properties object
　　　Properties properties = System.getProperties();
　　　//　Set the mail server
　　　properties.setProperty("mail.smtp.host", host);
　　　//　Get the default Session object.
　　　Session mailSession = Session.getDefaultInstance(properties);
　　　try{
　　　　　　//　Create a default MimeMessage object.
　　　　　　MimeMessage message = new MimeMessage(mailSession);
　　　　　　//　Set From: header field
　　　　　　message.setFrom(new InternetAddress(from));
　　　　　　//　Set To: header field
　　　　　　message.addRecipient(Message.RecipientType.TO,
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　new InternetAddress(to));
　　　　　　//　Set Subject: header field
　　　　　　message.setSubject("This is the Subject Line!");
　　　　　
　　　　　　//　Set HTML message
　　　　　　message.setContent("<h1>This is actual message/h1>",
　　　　　　　　　　　　　　　　　　　　　　　　　　　　"text/html");
　　　　　　//　Send message
　　　　　　Transport.send(message);
　　　　　　result = "Sent message successfully....";
　　　}catch (MessagingException mex) {
　　　　　　mex.printStackTrace();
　　　　　　result = "Error: unable to send message....";
　　　}
%>
<html>
<head>
<title>Send HTML Email using JSP</title>
</head>
<body>
<center>
<h1>Send Email using JSP</h1>
</center>
<p align="center">
<%　
　　　out.println("Result: "　+　result　+　"\n");
%>
</p>
</body>
</html>

Now you can try using the above JSP file to send an HTML message email.

Include an attachment in the email

This example shows how to send an email with an attachment.

<%@ page import="java.io."*,java.util.*,javax.mail.*"%>
<%@ page import="javax.mail.internet."*,javax.activation.*"%>
<%@ page import="javax.servlet.http."*,javax.servlet.*"%>
<%
　　　String result;
　　　//　The recipient's email
　　　String to = "[email protected]";
　　　//　The sender's email
　　　String from = "[email protected]";
　　　//　Assuming you are sending an email from the local host
　　　String host = "localhost";
　　　//　Get the system properties object
　　　Properties properties = System.getProperties();
　　　//　Set the mail server
　　　properties.setProperty("mail.smtp.host", host);
　　　//　Get the default Session object.
　　　Session mailSession = Session.getDefaultInstance(properties);
　　　try{
　　　　　　//　Create a default MimeMessage object.
　　　　　　MimeMessage message = new MimeMessage(mailSession);
　　　　　　//　Set From: header field
　　　　　　message.setFrom(new InternetAddress(from));
　　　　　　//　Set To: header field
　　　　　　message.addRecipient(Message.RecipientType.TO,
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　new InternetAddress(to));
　　　　　　//　Set Subject: header field
　　　　　　message.setSubject("This is the Subject Line!");
　　　　　　//　Create message part
　　　　　　BodyPart messageBodyPart = new MimeBodyPart();
　　　　　　//　Fill message
　　　　　　messageBodyPart.setText("This is message body");
　　　　　　
　　　　　　//　Create multimedia message
　　　　　　Multipart multipart = new MimeMultipart();
　　　　　　//　Set text message part
　　　　　　multipart.addBodyPart(messageBodyPart);
　　　　　　//　Attachment part
　　　　　　messageBodyPart = new MimeBodyPart();
　　　　　　String filename = "file.txt";
　　　　　　DataSource source = new FileDataSource(filename);
　　　　　　messageBodyPart.setDataHandler(new DataHandler(source));
　　　　　　messageBodyPart.setFileName(filename);
　　　　　　multipart.addBodyPart(messageBodyPart);
　　　　　　//　Send complete message
　　　　　　message.setContent(multipart);
　　　　　　//　Send message
　　　　　　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 Attachment Email using JSP</title>
</head>
<body>
<center>
<h1>Send Attachement Email using JSP</h1>
</center>
<p align="center">
<%　
　　　out.println("Result: "　+　result　+　"\n");
%>
</p>
</body>
</html>

User Authentication Section

If the email server requires username and password for user authentication, you can set it as follows:

　properties.setProperty("mail.user", "myuser");
　properties.setProperty("mail.password", "mypwd");

Send Email Using Form

Receive an email using an HTML form and retrieve all email information through the request object:

String to = request.getParameter("to");
String from = request.getParameter("from");
String subject = request.getParameter("subject");
String messageText = request.getParameter("body");

After obtaining the above information, you can use the examples mentioned earlier to send emails.