{"id":2565,"date":"2022-12-13T17:31:21","date_gmt":"2022-12-13T09:31:21","guid":{"rendered":"https:\/\/qaqaq.top\/?p=2565"},"modified":"2022-12-13T17:33:45","modified_gmt":"2022-12-13T09:33:45","slug":"%e8%b0%b7%e6%ad%8c%e9%aa%8c%e8%af%81%e7%a0%81kaptcha%e7%9a%84%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=2565","title":{"rendered":"\u8c37\u6b4c\u9a8c\u8bc1\u7801kaptcha\u7684\u4f7f\u7528"},"content":{"rendered":"\n

\u8868\u5355\u91cd\u590d\u63d0\u4ea4\u4e4b—–\u9a8c\u8bc1\u7801<\/h2>\n\n\n\n

\u8868\u5355\u91cd\u590d\u63d0\u4ea4\u6709\u4e09\u79cd\u5e38\u89c1\u7684\u60c5\u51b5\uff1a
\u4e00\uff1a\u63d0\u4ea4\u5b8c\u8868\u5355\u3002\u670d\u52a1\u5668\u4f7f\u7528\u8bf7\u6c42\u8f6c\u6765\u8fdb\u884c\u9875\u9762\u8df3\u8f6c\u3002\u8fd9\u4e2a\u65f6\u5019\uff0c\u7528\u6237\u6309\u4e0b\u529f\u80fd\u952e F5\uff0c\u5c31\u4f1a\u53d1\u8d77\u6700\u540e\u4e00\u6b21\u7684\u8bf7\u6c42\u3002\u9020\u6210\u8868\u5355\u91cd\u590d\u63d0\u4ea4\u95ee\u9898\u3002\u89e3\u51b3\u65b9\u6cd5\uff1a\u4f7f\u7528\u91cd\u5b9a\u5411\u6765\u8fdb\u884c\u8df3\u8f6c
\u4e8c\uff1a\u7528\u6237\u6b63\u5e38\u63d0\u4ea4\u670d\u52a1\u5668\uff0c\u4f46\u662f\u7531\u4e8e\u7f51\u7edc\u5ef6\u8fdf\u7b49\u539f\u56e0\uff0c\u8fdf\u8fdf\u672a\u6536\u5230\u670d\u52a1\u5668\u7684\u54cd\u5e94\uff0c\u8fd9\u4e2a\u65f6\u5019\uff0c\u7528\u6237\u4ee5\u4e3a\u63d0\u4ea4\u5931\u8d25\uff0c\u5c31\u4f1a\u7740\u6025\uff0c\u7136\u540e\u591a\u70b9\u4e86\u51e0\u6b21\u63d0\u4ea4\u64cd\u4f5c\uff0c\u4e5f\u4f1a\u9020\u6210\u8868\u5355\u91cd\u590d\u63d0\u4ea4\u3002
\u4e09\uff1a\u7528\u6237\u6b63\u5e38\u63d0\u4ea4\u670d\u52a1\u5668\u3002\u670d\u52a1\u5668\u4e5f\u6ca1\u6709\u5ef6\u8fdf\uff0c\u4f46\u662f\u63d0\u4ea4\u5b8c\u6210\u540e\uff0c\u7528\u6237\u56de\u9000\u6d4f\u89c8\u5668\u3002\u91cd\u65b0\u63d0\u4ea4\u3002\u4e5f\u4f1a\u9020\u6210\u8868\u5355\u91cd\u590d\u63d0\u4ea4\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u8c37\u6b4c kaptcha \u56fe\u7247\u9a8c\u8bc1\u7801\u7684\u4f7f\u7528<\/h2>\n\n\n\n

\u8c37\u6b4c\u9a8c\u8bc1\u7801 kaptcha \u4f7f\u7528\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n\n\n\n

1\u3001\u5bfc\u5165\u8c37\u6b4c\u9a8c\u8bc1\u7801\u7684 jar \u5305
kaptcha-2.3.2.jar<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

2\u3001\u5728 web.xml \u4e2d\u53bb\u914d\u7f6e\u7528\u4e8e\u751f\u6210\u9a8c\u8bc1\u7801\u7684 Servlet \u7a0b\u5e8f<\/p>\n\n\n\n

    <servlet>\r\n        <servlet-name>KaptchaServlet<\/servlet-name>\r\n        <servlet-class>top.qaqaq.servlet.MyKaptchaServlet<\/servlet-class>\r\n    <\/servlet>\r\n    <servlet-mapping>\r\n        <servlet-name>KaptchaServlet<\/servlet-name>\r\n        <url-pattern>\/kaptcha.jpg<\/url-pattern>\r\n    <\/servlet-mapping><\/code><\/pre>\n\n\n\n
3\u3001\u5728\u8868\u5355\u4e2d\u4f7f\u7528 img \u6807\u7b7e\u53bb\u663e\u793a\u9a8c\u8bc1\u7801\u56fe\u7247\u5e76\u4f7f\u7528\u5b83<\/p>\n\n\n\n
regist.jsp<\/p>\n\n\n\n
<%@ page contentType=\"text\/html; charset=UTF-8\" pageEncoding=\"UTF-8\" %>\r\n<!DOCTYPE html>\r\n<html>\r\n<head>\r\n    <title>JSP - Hello World<\/title>\r\n<\/head>\r\n<body>\r\n\r\n    <form action=\"http:\/\/localhost:8080\/JavaWeb_Code_Demo\/registServlet\" method=\"get\">\r\n        \u7528\u6237\u540d\uff1a<input type=\"text\" name=\"username\"> <br\/>\r\n        \u9a8c\u8bc1\u7801\uff1a<input type=\"text\" style=\"width: 60px\" name=\"code\">\r\n        <img src=\"http:\/\/localhost:8080\/JavaWeb_Code_Demo\/kaptcha.jpg\" alt=\"\" style=\"width: 100px; height: 28px;\"> <br\/>\r\n        <input type=\"submit\" value=\"\u6ce8\u518c\">\r\n    <\/form>\r\n\r\n    <br\/>\r\n<a href=\"hello-servlet\">Hello Servlet<\/a>\r\n<\/body>\r\n<\/html><\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
4\u3001\u5728\u670d\u52a1\u5668\u83b7\u53d6\u8c37\u6b4c\u751f\u6210\u7684\u9a8c\u8bc1\u7801\u548c\u5ba2\u6237\u7aef\u53d1\u9001\u8fc7\u6765\u7684\u9a8c\u8bc1\u7801\u6bd4\u8f83\u4f7f\u7528\u3002<\/p>\n\n\n\n
package top.qaqaq.servlet;\r\n\r\nimport jakarta.servlet.ServletException;\r\nimport jakarta.servlet.http.HttpServlet;\r\nimport jakarta.servlet.http.HttpServletRequest;\r\nimport jakarta.servlet.http.HttpServletResponse;\r\n\r\nimport java.io.IOException;\r\n\r\nimport static com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY;\r\n\r\n\/**\r\n * @author RichieZhang\r\n * @create 2022-12-13 \u4e0b\u5348 2:26\r\n *\/\r\npublic class RegistServlet extends HttpServlet {\r\n\r\n    @Override\r\n    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {\r\n\/\/        super.doGet(req, resp);\r\n\r\n        \/\/ \u83b7\u53d6Session\u4e2d\u7684\u9a8c\u8bc1\u7801\r\n        String token = (String) req.getSession().getAttribute(KAPTCHA_SESSION_KEY);\r\n        \/\/ \u5220\u9664 Session\u4e2d\u7684\u9a8c\u8bc1\u7801\r\n        req.getSession().removeAttribute(KAPTCHA_SESSION_KEY);\r\n\r\n        \/\/ \u83b7\u53d6\u8868\u5355\u9879\u8f93\u5165\u7684\u9a8c\u8bc1\u7801\r\n        String code = req.getParameter(\"code\");\r\n        \/\/ \u83b7\u53d6\u7528\u6237\u540d\r\n        String username = req.getParameter(\"username\");\r\n\r\n        if (token != null && token.equalsIgnoreCase(code)) {\r\n            System.out.println(\"\u4fdd\u5b58\u5230\u6570\u636e\u5e93\uff1a\" + username);\r\n\r\n            \/\/req.getRequestDispatcher(\"\/ok.jsp\").forward(req,resp);\r\n\r\n\/\/        try {\r\n\/\/            Thread.sleep(5000);\r\n\/\/        } catch (InterruptedException e) {\r\n\/\/            e.printStackTrace();\r\n\/\/        }\r\n\r\n            resp.sendRedirect(req.getContextPath() + \"\/ok.jsp\");\r\n        } else {\r\n            System.out.println(\"\u8bf7\u4e0d\u8981\u91cd\u590d\u63d0\u4ea4\u8868\u5355\");\r\n        }\r\n\r\n    }\r\n}\r\n<\/code><\/pre>\n\n\n\n
\u8df3\u8f6c\u7f51\u9875ok.jsp<\/p>\n\n\n\n
<%--\r\n  Created by IntelliJ IDEA.\r\n  User: ZRich\r\n  Date: 2022\/12\/13\r\n  Time: \u4e0b\u5348 2:30\r\n  To change this template use File | Settings | File Templates.\r\n--%>\r\n<%@ page contentType=\"text\/html;charset=UTF-8\" language=\"java\" %>\r\n<html>\r\n<head>\r\n    <title>Title<\/title>\r\n<\/head>\r\n<body>\r\n    \u6ce8\u518c\u6210\u529f\r\n<\/body>\r\n<\/html>\r\n<\/code><\/pre>\n\n\n\n
\u5207\u6362\u9a8c\u8bc1\u7801\uff1a<\/p>\n\n\n\n
\t\t\t\/\/ \u7ed9\u9a8c\u8bc1\u7801\u7684\u56fe\u7247\uff0c\u7ed1\u5b9a\u5355\u51fb\u4e8b\u4ef6\r\n\t\t\t$(\"#code_img\").click(function () {\r\n\t\t\t\t\/\/ \u5728\u4e8b\u4ef6\u54cd\u5e94\u7684function\u51fd\u6570\u4e2d\u6709\u4e00\u4e2athis\u5bf9\u8c61\u3002\u8fd9\u4e2athis\u5bf9\u8c61\uff0c\u662f\u5f53\u524d\u6b63\u5728\u54cd\u5e94\u4e8b\u4ef6\u7684dom\u5bf9\u8c61\u3002\r\n\t\t\t\t\/\/ src\u5c5e\u6027\u8868\u793a\u9a8c\u8bc1\u7801img\u6807\u7b7e\u7684 \u56fe\u7247\u8def\u5f84\u3002\u5b83\u53ef\u8bfb\uff0c\u53ef\u5199\r\n\t\t\t\t\/\/ alert(this.src);\r\n\t\t\t\tthis.src = \"${basePath}kaptcha.jpg?d=\" + new Date().getTime();\r\n\t\t\t})<\/code><\/pre>\n\n\n\n
web.xml<\/p>\n\n\n\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<web-app xmlns=\"https:\/\/jakarta.ee\/xml\/ns\/jakartaee\"\r\n         xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\r\n         xsi:schemaLocation=\"https:\/\/jakarta.ee\/xml\/ns\/jakartaee https:\/\/jakarta.ee\/xml\/ns\/jakartaee\/web-app_5_0.xsd\"\r\n         version=\"5.0\">\r\n\r\n    <servlet>\r\n        <servlet-name>RegistServlet<\/servlet-name>\r\n        <servlet-class>top.qaqaq.servlet.RegistServlet<\/servlet-class>\r\n    <\/servlet>\r\n    <servlet-mapping>\r\n        <servlet-name>RegistServlet<\/servlet-name>\r\n        <url-pattern>\/registServlet<\/url-pattern>\r\n    <\/servlet-mapping>\r\n\r\n    <servlet>\r\n        <servlet-name>KaptchaServlet<\/servlet-name>\r\n        <servlet-class>top.qaqaq.servlet.MyKaptchaServlet<\/servlet-class>\r\n    <\/servlet>a\r\n    <servlet-mapping>\r\n        <servlet-name>KaptchaServlet<\/servlet-name>\r\n        <url-pattern>\/kaptcha.jpg<\/url-pattern>\r\n    <\/servlet-mapping>\r\n<\/web-app><\/code><\/pre>\n\n\n\n
\u6ce8\u610f\uff1atomcat10\u4f7f\u7528kaptcha<\/h2>\n\n\n\n
package top.qaqaq.web;\r\n\r\nimport com.google.code.kaptcha.Producer;\r\nimport com.google.code.kaptcha.util.Config;\r\nimport jakarta.servlet.Servlet;\r\nimport jakarta.servlet.ServletConfig;\r\nimport jakarta.servlet.ServletException;\r\nimport jakarta.servlet.ServletOutputStream;\r\nimport jakarta.servlet.http.HttpServlet;\r\nimport jakarta.servlet.http.HttpServletRequest;\r\nimport jakarta.servlet.http.HttpServletResponse;\r\n\r\nimport javax.imageio.ImageIO;\r\nimport java.awt.image.BufferedImage;\r\nimport java.io.IOException;\r\nimport java.util.Date;\r\nimport java.util.Enumeration;\r\nimport java.util.Properties;\r\n\r\n\/**\r\n * @author RichieZhang\r\n * @create 2022-12-13 \u4e0b\u5348 3:21\r\n *\/\r\npublic class MyKaptchaServlet extends HttpServlet implements Servlet {\r\n    private Properties props = new Properties();\r\n    private Producer kaptchaProducer = null;\r\n    private String sessionKeyValue = null;\r\n    private String sessionKeyDateValue = null;\r\n\r\n    public MyKaptchaServlet() {\r\n    }\r\n\r\n    public void init(ServletConfig conf) throws ServletException {\r\n        super.init(conf);\r\n        ImageIO.setUseCache(false);\r\n        Enumeration initParams = conf.getInitParameterNames();\r\n\r\n        while (initParams.hasMoreElements()) {\r\n            String key = (String) initParams.nextElement();\r\n            String value = conf.getInitParameter(key);\r\n            this.props.put(key, value);\r\n        }\r\n\r\n        Config config = new Config(this.props);\r\n        this.kaptchaProducer = config.getProducerImpl();\r\n        this.sessionKeyValue = config.getSessionKey();\r\n        this.sessionKeyDateValue = config.getSessionDate();\r\n    }\r\n\r\n    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {\r\n        resp.setDateHeader(\"Expires\", 0L);\r\n        resp.setHeader(\"Cache-Control\", \"no-store, no-cache, must-revalidate\");\r\n        resp.addHeader(\"Cache-Control\", \"post-check=0, pre-check=0\");\r\n        resp.setHeader(\"Pragma\", \"no-cache\");\r\n        resp.setContentType(\"image\/jpeg\");\r\n        String capText = this.kaptchaProducer.createText();\r\n        req.getSession().setAttribute(this.sessionKeyValue, capText);\r\n        req.getSession().setAttribute(this.sessionKeyDateValue, new Date());\r\n        BufferedImage bi = this.kaptchaProducer.createImage(capText);\r\n        ServletOutputStream out = resp.getOutputStream();\r\n        ImageIO.write(bi, \"jpg\", out);\r\n    }\r\n}\r\n<\/code><\/pre>\n\n\n\n
web.xml<\/p>\n\n\n\n
    <servlet>\r\n        <servlet-name>KaptchaServlet<\/servlet-name>\r\n        <servlet-class>top.qaqaq.servlet.MyKaptchaServlet<\/servlet-class>\r\n    <\/servlet>a\r\n    <servlet-mapping>\r\n        <servlet-name>KaptchaServlet<\/servlet-name>\r\n        <url-pattern>\/kaptcha.jpg<\/url-pattern>\r\n    <\/servlet-mapping><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u8868\u5355\u91cd\u590d\u63d0\u4ea4\u4e4b—–\u9a8c\u8bc1\u7801 \u8868\u5355\u91cd\u590d\u63d0\u4ea4\u6709\u4e09\u79cd\u5e38\u89c1\u7684\u60c5\u51b5\uff1a\u4e00\uff1a\u63d0\u4ea4\u5b8c\u8868\u5355\u3002\u670d\u52a1\u5668\u4f7f\u7528\u8bf7\u6c42 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59],"tags":[61],"class_list":["post-2565","post","type-post","status-publish","format-standard","hentry","category-javaweb-code","tag-javaweb"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2565"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2565"}],"version-history":[{"count":2,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2565\/revisions"}],"predecessor-version":[{"id":2571,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2565\/revisions\/2571"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2565"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2565"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2565"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}