\u6211\u4ece\u6765\u4e0d\u559c\u6b22\u9a8c\u8bc1\u7801\uff0c\u56e0\u4e3a\u5b83\u603b\u662f\u8ba9\u6700\u7ec8\u7528\u6237\u53bb\u7406\u89e3\u5b57\u6bcd\u5e76\u8bc1\u660e\u81ea\u5df1\u662f\u4eba\u7c7b\u800c\u4e0d\u662f\u8f6f\u4ef6\u673a\u5668\u4eba\u3002\u4f46\u6700\u8fd1\u5728\u4e00\u4e2a\u7f51\u7ad9\u4e0a\u770b\u5230\u4e86\u65b0\u7684\u8c37\u6b4creCAPTCHA\uff0c\u6211\u7acb\u5373\u559c\u6b22\u4e0a\u4e86\u5b83\u3002\u56e0\u4e3a\u6211\u4eec\u53ea\u9700\u52fe\u9009\u4e00\u4e2a\u6846\uff0c\u5b83\u5c31\u80fd\u5224\u65ad\u4f60\u662f\u4eba\u8fd8\u662f\u673a\u5668\u4eba\u3002\u8c37\u6b4c\u79f0\u4e4b\u4e3a\u65e0\u9a8c\u8bc1\u7801reCAPTCHA\u4f53\u9a8c\uff0c\u5b83\u4f7f\u7528\u5148\u8fdb\u7684\u98ce\u9669\u5206\u6790\u5f15\u64ce\u548c\u81ea\u9002\u5e94\u9a8c\u8bc1\u7801\u6765\u963b\u6b62\u81ea\u52a8\u5316\u8f6f\u4ef6\u5728\u60a8\u7684\u7f51\u7ad9\u4e0a\u8fdb\u884c\u6ee5\u7528\u6d3b\u52a8\u3002\u6240\u4ee5\u672c\u6587\u7684\u57fa\u7840\u5c31\u662f\u5411\u60a8\u5c55\u793a\u5982\u4f55\u5728\u57fa\u4e8eJava\u7684Web\u5e94\u7528\u7a0b\u5e8f\u4e2d\u5229\u7528\u8c37\u6b4creCAPTCHA\u3002\u5728\u5f00\u59cb\u9879\u76ee\u4e4b\u524d\uff0c\u9996\u5148\u4f60\u9700\u8981\u53bb\u8c37\u6b4creCAPTCHA\u6ce8\u518c\u5e76\u8fdb\u884c\u7b7e\u7ea6\u3002\u7136\u540e\uff0c\u4f60\u5c06\u83b7\u5f97\u4e00\u4e2a\u7528\u4e8e\u5728\u7f51\u9875\u4e0a\u663e\u793areCaptcha\u5c0f\u90e8\u4ef6\u7684\u7ad9\u70b9\u5bc6\u94a5\u3002\u4f60\u8fd8\u5c06\u83b7\u5f97\u4e00\u4e2a\u4fdd\u5bc6\u7684\u5bc6\u94a5\uff0c\u7528\u4e8e\u4e0e\u8c37\u6b4c\u670d\u52a1\u5668\u901a\u4fe1\u4ee5\u9a8c\u8bc1\u9a8c\u8bc1\u7801\u7684\u56de\u5e94\u3002\u5728\u6ce8\u518c\u4e86\u4e00\u4e2a\u6d4b\u8bd5\u7ad9\u70b9\u4e4b\u540e\uff0c\u6211\u83b7\u5f97\u4e86\u4ee5\u4e0b\u5bc6\u94a5\uff0c\u5e76\u5c06\u5728\u6211\u7684\u9879\u76ee\u4e2d\u4f7f\u7528\u5b83\u4eec\u3002\u8bf7\u6ce8\u610f\uff0c\u5728\u6ce8\u518c\u65f6\u60a8\u8fd8\u9700\u8981\u63d0\u4f9b\u57df\u540d\uff0c\u5e76\u4e14\u5bc6\u94a5\u53ea\u80fd\u5728\u8be5\u57df\u540d\u4e0a\u4f7f\u7528\u3002\u6b64\u5916\uff0c\u5bc6\u94a5\u59cb\u7ec8\u53ef\u4ee5\u5728\u672c\u5730\u4e3b\u673a\u4e0a\u4f7f\u7528\uff0c\u56e0\u6b64\u6211\u53ef\u4ee5\u5728\u6211\u7684\u672c\u5730\u670d\u52a1\u5668\u4e0a\u8f7b\u677e\u6d4b\u8bd5\u3002\u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u7ee7\u7eed\u8fdb\u884c\u793a\u4f8b\u9879\u76ee\u3002\u6211\u4eec\u5c06\u6709\u4e00\u4e2a\u767b\u5f55\u9875\u9762\uff0c\u7528\u6237\u5c06\u5728\u5176\u4e2d\u8f93\u5165\u7528\u6237\u540d\u548c\u5bc6\u7801\uff0c\u5e76\u4e14\u8fd8\u9700\u8981\u89e3\u51b3reCaptcha\u5e76\u63d0\u4ea4\u8868\u5355\u3002\u63d0\u4ea4\u8868\u5355\u540e\uff0c\u6211\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u5c06\u9a8c\u8bc1\u7528\u6237\u540d\u548c\u5bc6\u7801\uff0c\u540c\u65f6\u5c06\u5e26\u6709\u5bc6\u94a5\u7684\u9a8c\u8bc1\u7801\u56de\u5e94\u53d1\u9001\u7ed9\u8c37\u6b4creCaptcha\u670d\u52a1\u5668\u5e76\u83b7\u53d6\u56de\u5e94\u3002\u8c37\u6b4creCaptcha\u7684\u56de\u5e94\u662f\u4e00\u4e2a\u5305\u542b\u6210\u529f\u5e03\u5c14\u5b57\u6bb5\u7684JSON\uff0c\u5982\u679c\u9a8c\u8bc1\u6210\u529f\uff0c\u8be5\u503c\u5c06\u4e3atrue\uff0c\u5426\u5219\u4e3afalse\u3002\u6211\u5c06\u4f7f\u7528Java JSON\u5904\u7406API\u6765\u89e3\u6790\u54cd\u5e94\u7684JSON\u3002\u4e0b\u9762\u7684\u56fe\u7247\u5c55\u793a\u4e86\u6211\u4eec\u5728Eclipse\u4e2d\u7684\u6700\u7ec8\u9879\u76ee\u3002\u8981\u83b7\u53d6\u9879\u76ee\u6846\u67b6\uff0c\u53ea\u9700\u5728Eclipse\u4e2d\u521b\u5efa\u4e00\u4e2a”Dynamic Web Project”\uff0c\u7136\u540e\u5c06\u5176\u8f6c\u6362\u4e3aMaven\u9879\u76ee\u3002\u53ea\u9700\u5728pom.xml\u6587\u4ef6\u4e2d\u6dfb\u52a0\u4ee5\u4e0b\u4f9d\u8d56\u9879\u6765\u4f7f\u7528JSON API\u3002<\/p>\n
<dependency>\r\n\t<groupId>org.glassfish<\/groupId>\r\n\t<artifactId>javax.json<\/artifactId>\r\n\t<version>1.0.2<\/version>\r\n<\/dependency>\r\n<\/code><\/pre>\n\u6211\u4eec\u9010\u4e00\u68c0\u89c6\u6bcf\u4e2a\u7ec4\u6210\u90e8\u5206\u3002<\/p>\n
\u4f7f\u7528\u8c37\u6b4c reCAPTCHA \u67e5\u770b\u9875\u9762<\/h3>\n
\u4ee5\u4e0b\u662f\u6211\u4eec\u7684\u767b\u5f55\u9875\u9762HTML\u4ee3\u7801\u3002login.html<\/p>\n
<!DOCTYPE html>\r\n<html>\r\n<head>\r\n<meta charset=\"US-ASCII\">\r\n<title>Login Page<\/title>\r\n<script src=\"https:\/\/www.google.com\/recaptcha\/api.js\"><\/script>\r\n<\/head>\r\n<body>\r\n\r\n\t<form action=\"LoginServlet\" method=\"post\">\r\n\r\n\t\tUsername: <input type=\"text\" name=\"user\"> <br> Password:\r\n\t\t<input type=\"password\" name=\"pwd\"> <br>\r\n\t\t<div class=\"g-recaptcha\"\r\n\t\t\tdata-sitekey=\"6LdMAgMTAAAAAGYY5PEQeW7b3L3tqACmUcU6alQf\"><\/div>\r\n\t\t<br> <input type=\"submit\" value=\"Login\">\r\n\t<\/form>\r\n<\/body>\r\n<\/html>\r\n<\/code><\/pre>\n\u6211\u4eec\u9700\u8981\u5728HTML\u5934\u90e8\u90e8\u5206\u6dfb\u52a0Google reCaptcha JS\u6587\u4ef6\uff0c\u7136\u540e\u5728\u6211\u4eec\u7684\u8868\u5355\u4e2d\u6dfb\u52a0<\/p>\n
<\/div>\n\u4ee5\u83b7\u5f97reCaptcha\u5c0f\u90e8\u4ef6\u3002\u8fd9\u5c31\u662f\u5728\u5ba2\u6237\u7aef\u7684\u6240\u6709\u64cd\u4f5c\uff0c\u771f\u7684\u5f88\u7b80\u5355\uff01\u4e00\u65e6\u7528\u6237\u901a\u8fc7\u9a8c\u8bc1\uff0c\u4ed6\u5c06\u88ab\u53d1\u9001\u5230\u4e0b\u9762\u7684\u6210\u529f\u9875\u9762\u3002LoginSuccess.jsp<\/p>\n
<%@ page language=\"java\" contentType=\"text\/html; charset=US-ASCII\"\r\n pageEncoding=\"US-ASCII\"%>\r\n<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.01 Transitional\/\/EN\" \"https:\/\/www.w3.org\/TR\/html4\/loose.dtd\">\r\n<html>\r\n<head>\r\n<meta http-equiv=\"Content-Type\" content=\"text\/html; charset=US-ASCII\">\r\n<title>Login Success Page<\/title>\r\n<\/head>\r\n<body>\r\n<h3>Hi Pankaj, Login successful.<\/h3>\r\n<a href=\"login.html\">Login Page<\/a>\r\n<\/body>\r\n<\/html>\r\n<\/code><\/pre>\n\u767b\u5f55Servlet<\/h3>\n
\u4ee5\u4e0b\u662f\u6211\u4eec\u7684\u7b80\u5355LoginServlet.java servlet\u4ee3\u7801\uff0c\u6211\u4eec\u5728\u5176\u4e2d\u9a8c\u8bc1\u7528\u6237\u540d\u548c\u5bc6\u7801\u5b57\u6bb5\u3002\u4e3a\u4e86\u7b80\u4fbf\u8d77\u89c1\uff0c\u5b83\u4eec\u88ab\u5d4c\u5165\u5728servlet\u4ee3\u7801\u4e2d\u4f5c\u4e3aWebInitParam\u3002\u8bf7\u6ce8\u610f\uff0c\u60a8\u9700\u8981\u4f7f\u7528Servlet 3\u6765\u4f7f\u7528\u8fd9\u4e9b\u6ce8\u89e3\uff0c\u56e0\u6b64\u60a8\u9700\u8981\u4f7f\u7528\u652f\u6301servlet\u89c4\u83033\u7684Tomcat-7\u6216\u66f4\u9ad8\u7248\u672c\u3002<\/p>\n
package com.Olivia.servlet;\r\n\r\nimport java.io.IOException;\r\nimport java.io.PrintWriter;\r\n\r\nimport javax.servlet.RequestDispatcher;\r\nimport javax.servlet.ServletException;\r\nimport javax.servlet.annotation.WebInitParam;\r\nimport javax.servlet.annotation.WebServlet;\r\nimport javax.servlet.http.HttpServlet;\r\nimport javax.servlet.http.HttpServletRequest;\r\nimport javax.servlet.http.HttpServletResponse;\r\n\r\nimport com.Olivia.utils.VerifyRecaptcha;\r\n\r\n\/**\r\n * Servlet implementation class LoginServlet\r\n *\/\r\n@WebServlet(description = \"Login Servlet\", urlPatterns = { \"\/LoginServlet\" }, initParams = {\r\n\t\t@WebInitParam(name = \"user\", value = \"Pankaj\"),\r\n\t\t@WebInitParam(name = \"password\", value = \"journaldev\") })\r\npublic class LoginServlet extends HttpServlet {\r\n\r\n\tprivate static final long serialVersionUID = -6506682026701304964L;\r\n\r\n\tprotected void doPost(HttpServletRequest request,\r\n\t\t\tHttpServletResponse response) throws ServletException, IOException {\r\n\r\n\t\t\/\/ get request parameters for userID and password\r\n\t\tString user = request.getParameter(\"user\");\r\n\t\tString pwd = request.getParameter(\"pwd\");\r\n\t\t\/\/ get reCAPTCHA request param\r\n\t\tString gRecaptchaResponse = request\r\n\t\t\t\t.getParameter(\"g-recaptcha-response\");\r\n\t\tSystem.out.println(gRecaptchaResponse);\r\n\t\tboolean verify = VerifyRecaptcha.verify(gRecaptchaResponse);\r\n\r\n\t\t\/\/ get servlet config init params\r\n\t\tString userID = getServletConfig().getInitParameter(\"user\");\r\n\t\tString password = getServletConfig().getInitParameter(\"password\");\r\n\t\t\/\/ logging example\r\n\t\tSystem.out.println(\"User=\" + user + \"::password=\" + pwd + \"::Captcha Verify\"+verify);\r\n\r\n\t\tif (userID.equals(user) && password.equals(pwd) && verify) {\r\n\t\t\tresponse.sendRedirect(\"LoginSuccess.jsp\");\r\n\t\t} else {\r\n\t\t\tRequestDispatcher rd = getServletContext().getRequestDispatcher(\r\n\t\t\t\t\t\"\/login.html\");\r\n\t\t\tPrintWriter out = response.getWriter();\r\n\t\t\tif (verify) {\r\n\t\t\t\tout.println(\"<font color=red>Either user name or password is wrong.<\/font>\");\r\n\t\t\t} else {\r\n\t\t\t\tout.println(\"<font color=red>You missed the Captcha.<\/font>\");\r\n\t\t\t}\r\n\t\t\trd.include(request, response);\r\n\t\t}\r\n\t}\r\n}\r\n<\/code><\/pre>\n\u4e00\u65e6\u63d0\u4ea4\u5e26\u6709\u9a8c\u8bc1\u7801\u7684\u8868\u5355\uff0c\u6211\u4eec\u4f1a\u5f97\u5230\u5fc5\u987b\u53d1\u9001\u4ee5\u8fdb\u884c\u9a8c\u8bc1\u7684\u201cg-recaptcha-response\u201d\u8bf7\u6c42\u53c2\u6570\u3002\u6700\u540e\u4e00\u90e8\u5206\u662f\u7528\u4e8e\u53d1\u9001\u9a8c\u8bc1\u7684POST\u8bf7\u6c42\u548c\u89e3\u6790JSON\u54cd\u5e94\u5e76\u6309\u7167\u76f8\u5e94\u8fd4\u56de\u7684\u5b9e\u7528\u7c7b\u3002<\/p>\n
package com.Olivia.utils;\r\n\r\nimport java.io.BufferedReader;\r\nimport java.io.DataOutputStream;\r\nimport java.io.IOException;\r\nimport java.io.InputStreamReader;\r\nimport java.io.StringReader;\r\nimport java.net.URL;\r\n\r\nimport javax.json.Json;\r\nimport javax.json.JsonObject;\r\nimport javax.json.JsonReader;\r\nimport javax.net.ssl.HttpsURLConnection;\r\n\r\npublic class VerifyRecaptcha {\r\n\r\n\tpublic static final String url = \"https:\/\/www.google.com\/recaptcha\/api\/siteverify\";\r\n\tpublic static final String secret = \"6LdMAgMTAAAAAJOAqKgjWe9DUujd2iyTmzjXilM7\";\r\n\tprivate final static String USER_AGENT = \"Mozilla\/5.0\";\r\n\r\n\tpublic static boolean verify(String gRecaptchaResponse) throws IOException {\r\n\t\tif (gRecaptchaResponse == null || \"\".equals(gRecaptchaResponse)) {\r\n\t\t\treturn false;\r\n\t\t}\r\n\t\t\r\n\t\ttry{\r\n\t\tURL obj = new URL(url);\r\n\t\tHttpsURLConnection con = (HttpsURLConnection) obj.openConnection();\r\n\r\n\t\t\/\/ add reuqest header\r\n\t\tcon.setRequestMethod(\"POST\");\r\n\t\tcon.setRequestProperty(\"User-Agent\", USER_AGENT);\r\n\t\tcon.setRequestProperty(\"Accept-Language\", \"en-US,en;q=0.5\");\r\n\r\n\t\tString postParams = \"secret=\" + secret + \"&response=\"\r\n\t\t\t\t+ gRecaptchaResponse;\r\n\r\n\t\t\/\/ Send post request\r\n\t\tcon.setDoOutput(true);\r\n\t\tDataOutputStream wr = new DataOutputStream(con.getOutputStream());\r\n\t\twr.writeBytes(postParams);\r\n\t\twr.flush();\r\n\t\twr.close();\r\n\r\n\t\tint responseCode = con.getResponseCode();\r\n\t\tSystem.out.println(\"\\nSending 'POST' request to URL : \" + url);\r\n\t\tSystem.out.println(\"Post parameters : \" + postParams);\r\n\t\tSystem.out.println(\"Response Code : \" + responseCode);\r\n\r\n\t\tBufferedReader in = new BufferedReader(new InputStreamReader(\r\n\t\t\t\tcon.getInputStream()));\r\n\t\tString inputLine;\r\n\t\tStringBuffer response = new StringBuffer();\r\n\r\n\t\twhile ((inputLine = in.readLine()) != null) {\r\n\t\t\tresponse.append(inputLine);\r\n\t\t}\r\n\t\tin.close();\r\n\r\n\t\t\/\/ print result\r\n\t\tSystem.out.println(response.toString());\r\n\t\t\r\n\t\t\/\/parse JSON response and return 'success' value\r\n\t\tJsonReader jsonReader = Json.createReader(new StringReader(response.toString()));\r\n\t\tJsonObject jsonObject = jsonReader.readObject();\r\n\t\tjsonReader.close();\r\n\t\t\r\n\t\treturn jsonObject.getBoolean(\"success\");\r\n\t\t}catch(Exception e){\r\n\t\t\te.printStackTrace();\r\n\t\t\treturn false;\r\n\t\t}\r\n\t}\r\n}\r\n<\/code><\/pre>\n\u5c31\u8fd9\u4e9b\u3002\u6211\u4eec\u7684\u7533\u8bf7\u5df2\u7ecf\u51c6\u5907\u597d\u4e86\uff0c\u4e0b\u9762\u662f\u6839\u636e\u7528\u6237\u7684\u8f93\u5165\u5f97\u5230\u7684\u54cd\u5e94\u9875\u9762\u3002\u5e26\u6709\u8c37\u6b4cRecaptcha\u5c0f\u90e8\u4ef6\u7684\u767b\u5f55\u9875\u9762\uff0c\u5ba2\u6237\u7aef\u9a8c\u8bc1\u8fc7\u7684\u8c37\u6b4cRecaptcha\u9a8c\u8bc1\u7684\u54cd\u5e94\u9875\u9762\uff0c\u670d\u52a1\u5668\u7aef\u8c37\u6b4cRecaptcha\u9a8c\u8bc1\u540e\u7684\u54cd\u5e94\u9875\u9762\uff0c\u672a\u89e3\u51b3Recaptcha\u7684\u54cd\u5e94\u9875\u9762\uff0cRecaptcha\u5df2\u89e3\u51b3\u4f46\u7528\u6237\/\u5bc6\u7801\u4e0d\u5339\u914d\u7684\u54cd\u5e94\u9875\u9762\u3002\u60a8\u53ef\u4ee5\u4ece\u4e0b\u9762\u7684\u94fe\u63a5\u4e0b\u8f7d\u9879\u76ee\u5e76\u8fdb\u884c\u66f4\u591a\u7684\u5c1d\u8bd5\u3002<\/p>\n
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