jsp的一些简单例子

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获取页面的basePath

<%String path = request.getContextPath();String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";%><html><head>    <title>base path</title></head><body>    base path is <%=basePath%></body></html>

error页面

<%@ page isErrorPage="true" pageEncoding="utf-8" %><html><head>    <title>errors occur</title></head><body>    <p>the exception is:<br><%= exception %></p></body></html>

图片部分超链接的实现

<%@ page contentType="text/html;charset=UTF-8" pageEncoding="utf-8" %><html>    <meta http-equiv=Content-Type content="text/html;charset=utf-8"><head>    <title>FirstPage</title></head><body>    <img width="270px" src="logo_white_ee663702.png" usemap="#map" />    <map name="map" id="M">        <area shape="rect" coords="0,0,135,129" href="sample.jsp">        <area shape="rect" coords="135,0,270,129" href="http://www.baidu.com/">    </map>    <marquee behavior="alternate" bgcolor="red" direction="right" scrollamount="8">        <font color=#00FFFF size="7px">★☆★☆★</font>    </marquee>    <p><font color=blue size=4 face="Bookman Old Style">the time is: <%=new java.util.Date()%></font></p>    <hr size="50px" align=left color=#ff0000>    <ol start=3 type=A>        <li>textarea</li>    </ol>    <textarea rows=3 cols=100 name="ght">helloworld</textarea></body></html>

登陆界面，javascript控制输入框非空

<html><meta http-equiv=Content-Type content="text/html;charset=utf-8"><head>    <title>login</title>    <script type="text/javascript">    function Check() {        with(document.info) {            var username = user.value;            var pass = password.value;            if(username == null || username == "") alert("用户名为空");            else if (pass == null || pass == "") alert("密码为空");            else submit();        }    }    </script></head><body><br><br><br><br><center>    <form name="info" action="session.jsp" method="get">        <table>            <tr><td colspan="2" align="center">用户登录</td></tr>            <tr><td>登录名：</td><td><input type="text" name="user"></td></tr>            <tr><td>密码：</td><td><input type="password" name="password"></td></tr>        </table>        <input type="button" value="登录" onclick="Check()">        <input type="reset" value="重置">    </form></center></body></html>

时间的显示，每1秒自动更新一次

<%@ page language="java" import="java.util.*,java.text.SimpleDateFormat" %><%@ page contentType="text/html;charset=UTF-8" pageEncoding="utf-8" errorPage="error.jsp" %><html><head>    <title>time</title></head><body bgcolor="#00ffff">    <%    response.setHeader("refresh","5");    Date now = new Date();    out.println("当前时间是："+now+"<br>");    SimpleDateFormat f = new SimpleDateFormat("现在是"+"yyyy年MM月dd日Eahh点mm分ss秒");    out.println(f.format(now));    %></body></html>

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