java邮件开发--心得6-web email的编写
1. 前面讲了好多客户端的电子邮件，实际情况下实际应用价值比较小的，实际生活中用的最多的是网页上的发送email功能，这里比如一个web应用中带有邮件发送功能。
2.下面介绍一个web email使用comcast自带的JNDI的案例及其分析：
package com.web.servlet;import java.io.IOException;import javax.mail.Message;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import javax.naming.Context;import javax.naming.InitialContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** *用一个content.xml配置文件来编写一个web email * */public class SendMailServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {try {Context context = (Context)new InitialContext().lookup("java:comp/env");Session session = (Session)context.lookup("mail/context");Message msg = new MimeMessage(session);msg.setFrom(new InternetAddress("itcast_test@sina.com"));InternetAddress[] to = {new InternetAddress("itcast_test@sina.com")};msg.setRecipients(Message.RecipientType.TO,to);msg.setSubject("web email");msg.setText("这是一封 java web写的email");Transport transport = session.getTransport();transport.connect("itcast_test","123456");transport.sendMessage(msg,to);transport.close();response.getWriter().println("send ok!");} catch (Exception e) {e.printStackTrace(response.getWriter());}}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}The resources defined in these elements may be referenced by the following elements in the web application deployment descriptor (/WEB-INF/web.xml) of your web application;重要的配置文件context.xml,该文件放在WEB-INF下的META-INF下，里面的具体如下：<Context> <Resource name="mail/context" auth="Container" type="javax.mail.Session" mail.smtp.host="smtp.sina.com" mail.smtp.auth="true" mail.transport.protocol="smtp" /></Context>