javaWeb之使用Kaptcha组件使用验证码
web.xml:
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<? 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:
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<%@ 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:
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<%@ 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:
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