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JSP发送电子邮件
以下内容引用自http://wiki.jikexueyuan.com/project/jsp/sending-email.html：
发送一个简单的电子邮件
给出一个简单的例子，从机器上发送一个简单的邮件。假设本地主机连接到互联网，能够足以发送一封电子邮件。
<%@ 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>
现在将上面的代码放在SendEmail.jsp文件，并且使用URL：http://localhost:8080/SendEmail.jsp来调用此JSP，将电子邮件发送到给定的邮箱ID为abcd@gmail.com中，显示的响应结果如下所示。
如果想给多个收件人发送邮件，下面的方法可用于发送邮件给指定的多个邮箱IDs：
void addRecipients(Message.RecipientType type, Address[] addresses) throws MessagingException
下面是对参数的描述：
type：可设置为TO，CC或者BCC。其中，CC表示Carbon Copy，BCC表示Black Carbon Copy。例如，Message.RecipientType.TO。
- addresses：它是邮箱ID的数组。能使用InternetAddress()方法，同时指定邮箱IDs。
发送HTML邮件
这个例子与之前给出的例子非常相似，除了在这个例子中使用setContent()方法设置第二个参数为“text/html”，用来指定网页内容包含在这个信息中。
使用这个例子，可以发送与网页内容一样大的邮件。
<%@ 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>
现在可以使用上述JSP发送网页信息给指定的邮箱ID。
在电子邮件中发送附件：
给定一个例子，从机器上发送一个带附件的邮箱：
<%@ 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>
现在可以运行上述JSP发送一个文件作为信息的附件给指定邮箱ID。
用户身份验证部分
为了身份验证的目的，如果需要提供用户ID和密码给邮箱服务器，可以设置这些属性如下：
props.setProperty("mail.user", "myuser");props.setProperty("mail.password", "mypwd");邮件发送机制的设置和上述的解释一致。
用表单发送邮件
可以使用网页表单接受邮件参数，然后可以使用Request对象获得如下的所有信息：
String to = request.getParameter("to");String from = request.getParameter("from");String subject = request.getParameter("subject");String messageText = request.getParameter("body");
测试工程：https://github.com/easonjim/5_java_example/tree/master/jspbasics/test16
JSP发送电子邮件
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