标签：text ebs fun zha res html 4.01 head author lan
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>表单提交</title>
<script type="text/javascript">
function _hyz() {
/*
1. 获取img元素
2. 改变src的指向
*/
var img = document.getElementById("img");
//需要加一个参数才能干掉浏览器的缓存
img.src = "/tools/VerifyCodeServlet?a=" + new Date().getTime();
}
</script>
</head>
<body>
<!--
生成验证码：
1. 写表单，其中包含图片（验证码）
2. 让图片显示出来：
把<img>的src指向VerifyCodeServlet，你需要在web.xml中部署VerifyCodeServlet
-->
<form action="/tools/loginServlet" method="post">
<!-- 添加一个参数：method=login -->
<input type="hidden" name="method" value="login">
用户名：<input type="text" name="name"/><br />
密码：<input type="password" name="pwd" /><br />
验证码：<input type="text" name="verifyCode" /><br />
<img src="/tools/VerifyCodeServlet" id="img"/><br />
<a href="javascript:_hyz()">换一张</a>
<input type="submit" value="提交" />
</form>
</body>
</html><servlet>
<servlet-name>VerifyCodeServlet</servlet-name>
<servlet-class>cn.itcast.vcode.servlet.VerifyCodeServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>VerifyCodeServlet</servlet-name>
<url-pattern>/VerifyCodeServlet</url-pattern>
</servlet-mapping>
package cn.itcast.test;import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.itcast.servlet.BaseServlet;
/**
备注：br/>*/
@WebServlet("/loginServlet")
public class loginServlet extends BaseServlet {
public String login(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//检验验证码
//1. 获取表单中的验证码
String verifyCode = request.getParameter("verifyCode");
//2. 获取图片上的文字
String vcode = (String)request.getSession().getAttribute("vCode");
//3. 检验
System.out.println(verifyCode.equalsIgnoreCase(vcode));
return null;}
}
标签：text ebs fun zha res html 4.01 head author lan
原文地址：http://blog.51cto.com/13416247/2065966
