javaWeb使用Kaptcha组件生成验证码

程序员文章站 2024-03-12 19:32:32

javaweb之使用kaptcha组件使用验证码 web.xml:

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：

javaWeb使用Kaptcha组件生成验证码