javaWeb使用Kaptcha组件生成验证码

2019-11-26 13:39:43

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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：

这里写图片描述