以下內容引用自http://wiki.jikexueyuan.com/project/jsp/sending-email.html：
發送一個簡單的電子郵件
給出一個簡單的例子，從機器上發送一個簡單的郵件。假設本地主機連接到互聯網，能夠足以發送一封電子郵件。
<%@ page import="java.io.*,java.util.*,javax.mail.*"%> <%@ page import="javax.mail.internet.*,javax.activation.*"%> <%@ page import="javax.servlet.http.*,javax.servlet.*" %> <% String result; // Recipient's email ID needs to be mentioned. String to = "abcd@gmail.com"; // Sender's email ID needs to be mentioned String from = "mcmohd@gmail.com"; // Assuming you are sending email from localhost String host = "localhost"; // Get system properties object Properties properties = System.getProperties(); // Setup 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 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); result = "Sent message successfully...."; }catch (MessagingException mex) { mex.printStackTrace(); result = "Error: unable to send message...."; } %> <html> <head> <title>Send 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>
現在將上面的代碼放在SendEmail.jsp文件，並且使用URL：http://localhost:8080/SendEmail.jsp來調用此JSP，將電子郵件發送到給定的郵箱ID為abcd@gmail.com中，顯示的響應結果如下所示。
如果想給多個收件人發送郵件，下面的方法可用於發送郵件給指定的多個郵箱IDs：
void addRecipients(Message.RecipientType type, Address[] addresses) throws MessagingException
下面是對參數的描述：
-
type：可設置為TO，CC或者BCC。其中，CC表示Carbon Copy，BCC表示Black Carbon Copy。例如，Message.RecipientType.TO。
- addresses：它是郵箱ID的數組。能使用InternetAddress()方法，同時指定郵箱IDs。
發送HTML郵件
這個例子與之前給出的例子非常相似，除了在這個例子中使用setContent()方法設置第二個參數為“text/html”，用來指定網頁內容包含在這個信息中。
使用這個例子，可以發送與網頁內容一樣大的郵件。
<%@ page import="java.io.*,java.util.*,javax.mail.*"%> <%@ page import="javax.mail.internet.*,javax.activation.*"%> <%@ page import="javax.servlet.http.*,javax.servlet.*" %> <% String result; // Recipient's email ID needs to be mentioned. String to = "abcd@gmail.com"; // Sender's email ID needs to be mentioned String from = "mcmohd@gmail.com"; // Assuming you are sending email from localhost String host = "localhost"; // Get system properties object Properties properties = System.getProperties(); // Setup 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 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!"); // Send the actual HTML message, as big as you like 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>
現在可以使用上述JSP發送網頁信息給指定的郵箱ID。
在電子郵件中發送附件：
給定一個例子，從機器上發送一個帶附件的郵箱：
<%@ page import="java.io.*,java.util.*,javax.mail.*"%> <%@ page import="javax.mail.internet.*,javax.activation.*"%> <%@ page import="javax.servlet.http.*,javax.servlet.*" %> <% String result; // Recipient's email ID needs to be mentioned. String to = "abcd@gmail.com"; // Sender's email ID needs to be mentioned String from = "mcmohd@gmail.com"; // Assuming you are sending email from localhost String host = "localhost"; // Get system properties object Properties properties = System.getProperties(); // Setup 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 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!"); // Create the message part BodyPart messageBodyPart = new MimeBodyPart(); // Fill the message messageBodyPart.setText("This is message body"); // Create a multipar message Multipart multipart = new MimeMultipart(); // Set text message part multipart.addBodyPart(messageBodyPart); // Part two is attachment messageBodyPart = new MimeBodyPart(); String filename = "file.txt"; DataSource source = new FileDataSource(filename); messageBodyPart.setDataHandler(new DataHandler(source)); messageBodyPart.setFileName(filename); multipart.addBodyPart(messageBodyPart); // Send the complete message parts 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 Attachement 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>
現在可以運行上述JSP發送一個文件作為信息的附件給指定郵箱ID。
用戶身份驗證部分
為了身份驗證的目的，如果需要提供用戶ID和密碼給郵箱服務器，可以設置這些屬性如下：
props.setProperty("mail.user", "myuser");
props.setProperty("mail.password", "mypwd");
郵件發送機制的設置和上述的解釋一致。
用表單發送郵件
可以使用網頁表單接受郵件參數，然后可以使用Request對象獲得如下的所有信息：
String to = request.getParameter("to");
String from = request.getParameter("from");
String subject = request.getParameter("subject");
String messageText = request.getParameter("body");
測試工程：https://github.com/easonjim/5_java_example/tree/master/jspbasics/test16