Java笔记-编码方式创建kaptcha验证码
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Java笔记-编码方式创建kaptcha验证码
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這里使用編碼的方式調用kaptcha實現驗證碼功能
程序運行截圖如下：
輸入錯誤后，還是這個界面，但輸入正確后：
maven如下：
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.example</groupId><artifactId>kaptchaDemo2</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><dependencies><dependency><groupId>com.github.penggle</groupId><artifactId>kaptcha</artifactId><version>2.3.2</version></dependency></dependencies></project>程序結構如下：
源碼如下：
LoginServlet.java
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 java.io.IOException;@WebServlet(value = "/login") public class LoginServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String vailCode = request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY).toString().toLowerCase();String inCode = request.getParameter("inCode").toLowerCase();if (inCode.equals(vailCode)) {response.sendRedirect("success.jsp");} else {String url = request.getHeader("Referer");response.sendRedirect(url);}} }MyServlet.java
<!DOCTYPE web-app PUBLIC"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN""http://java.sun.com/dtd/web-app_2_3.dtd" ><web-app><display-name>Archetype Created Web Application</display-name> </web-app>web.xml
<!DOCTYPE web-app PUBLIC"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN""http://java.sun.com/dtd/web-app_2_3.dtd" ><web-app><display-name>Archetype Created Web Application</display-name> </web-app>index.jsp
<%--Created by IntelliJ IDEA.User: cffDate: 2020/2/1Time: 9:38To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head><title>kaptchaDemo</title><style type="text/css">.code_a{color: #0000ff;font-size: 12px;text-decoration: none;cursor: pointer;}#imgCode{cursor: pointer;}</style><script type="text/javascript">function changeCode(){var imgCode = document.getElementById("imgCode");imgCode.src = "kaptcha?"+Math.random();}</script> </head><body> <form action="login" method="post"><label>驗證碼：</label><input type="text" id="inCode" name="inCode" /><img src="kaptcha" align="center" id="imgCode" onclick="changeCode()" /><a class="code_a" onclick="changeCode()">換一張</a><br /><input type="submit" value="登錄"/> </form> </body> </html>success.jsp
<%--Created by IntelliJ IDEA.User: cffDate: 2020/2/1Time: 9:49To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head><title>Title</title> </head> <body> <h1>SUCCESS</h1> </body> </html>?
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