javaWeb使用Kaptcha组件生成验证码

javaWeb之使用Kaptcha组件使用验证码

web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

<display-name>kaptcha</display-name>

<servlet>

<servlet-name>kaptcha</servlet-name>

<servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>kaptcha</servlet-name>

<url-pattern>/randomcode.jpg</url-pattern>

</servlet-mapping>

<welcome-file-list>

<welcome-file>index.html</welcome-file>

<welcome-file>index.htm</welcome-file>

<welcome-file>index.jsp</welcome-file>

<welcome-file>default.html</welcome-file>

<welcome-file>default.htm</welcome-file>

<welcome-file>default.jsp</welcome-file>

</welcome-file-list>

</web-app>

index.jsp:

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>

<%

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>

<form action="check.jsp">

<img alt="" src="randomcode.jpg">

<input type="text" name="r"/>

<input type="submit" />

</form>

</body>

</html>

check.jsp:

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>

<%

//检测是否是正确的验证码

String k=(String)session.getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);

String str=request.getParameter("r");

if(k.equals(str))

out.print("true");

out.print(" "+k+"---"+str);

%>

结果:

验证码部分属性修改说明:

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

以上是 javaWeb使用Kaptcha组件生成验证码 的全部内容, 来源链接: utcz.com/p/210491.html

回到顶部