1。拷贝mail.jar到Tomcat\lib目录中。
2。在WebRoot下的META-INF中添加context.xml配置文件：
<?xml version="1.0" encoding="UTF-8"?>
<Context>
<Resource name="mail/Session" auth="Container"
type="javax.mail.Session"
mail.smtp.host="smtp.163.com"/>
</Context>3。在jsp文件中用JNDI的API从JNDI容器查找session对象，index.jsp文件：
<%@page import="javax.mail.Session"%>
<%@page import="javax.naming.InitialContext"%>
<%@page import="javax.naming.Context"%>
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
Session s = (Session) envCtx.lookup("mail/Session");
out.print(s.toString());
%>
</body>
</html>