<p><img src="https://simg.open-open.com/show/03c6ee08cd2836076e2dc0e316fcb3c8.jpg"></p>    <h2><strong>简介</strong></h2>    <p>极验证与以往传统验证码不同的是，极验通过分析用户完成拼图过程中的行为特征，通过数据分析来判断是人还是机器。用户不必面对眼花缭乱的英文字符或汉字，整个验证过程变的像游戏一样有趣。</p>    <h2><strong>引入GeetestLib</strong></h2>    <pre>  import com.geetest.sdk.java.GeetestLib;</pre>    <h2><strong>API说明</strong></h2>    <p>GeetestLib(String captchaId, String privateKey) : 构造函数</p>    <p>preProcess() : 预处理接口</p>    <p>getResponseStr() : 获取预处理结果的接口</p>    <p>enhencedValidateRequest(String challenge, String validate, String seccode) : 极验服务器状态正常的二次验证接口</p>    <p>failbackValidateRequest(String challenge, String validate, String seccode) : 极验服务器状态宕机的二次验证接口</p>    <h2><strong>GeetestConfig 配置文件</strong></h2>    <pre>  public class GeetestConfig {        private static final String captcha_id_web = "";      private static final String captcha_id_wap = "";      private static final String private_key_web = "";      private static final String private_key_wap = "";        public static final String getWebCaptcha_id() {          return captcha_id_web;      }        public static final String getWebPrivate_key() {          return private_key_web;      }        public static final String getWapCaptcha_id() {          return captcha_id_wap;      }        public static final String getWapPrivate_key() {          return private_key_wap;      }    }</pre>    <h2><strong>验证初始化</strong></h2>    <pre>  @RequestMapping(value = "/gt/init")  @ResponseBody  public String geetestStart(HttpServletRequest request){      GeetestLib gtSdk = null;      if(isMobile(request)){          gtSdk = new GeetestLib(GeetestConfig.getWapCaptcha_id(), GeetestConfig.getWapPrivate_key());      }else{          gtSdk = new GeetestLib(GeetestConfig.getWebCaptcha_id(), GeetestConfig.getWebPrivate_key());      }        //自定义userid      String userid = "test";        //进行验证预处理      int gtServerStatus = gtSdk.preProcess(userid);        //将服务器状态设置到session中      request.getSession().setAttribute(gtSdk.gtServerStatusSessionKey, gtServerStatus);      //将userid设置到session中      request.getSession().setAttribute("userid", userid);        return gtSdk.getResponseStr();  }</pre>    <h2><strong>二次验证</strong></h2>    <pre>  boolean validGtCode(HttpServletRequest request) {      GeetestLib gtSdk = null;      if(isMobile(request)){          gtSdk = new GeetestLib(GeetestConfig.getWapCaptcha_id(), GeetestConfig.getWapPrivate_key());      }else{          gtSdk = new GeetestLib(GeetestConfig.getWebCaptcha_id(), GeetestConfig.getWebPrivate_key());      }      String challenge = request.getParameter(GeetestLib.fn_geetest_challenge);      String validate = request.getParameter(GeetestLib.fn_geetest_validate);      String seccode = request.getParameter(GeetestLib.fn_geetest_seccode);        //从session中获取userid      String userid = (String)request.getSession().getAttribute("userid");        //从session中获取gt-server状态      int gt_server_status_code = (Integer) request.getSession().getAttribute(gtSdk.gtServerStatusSessionKey);        int gtResult = 0;        if (gt_server_status_code == 1) {          //gt-server正常，向gt-server进行二次验证            gtResult = gtSdk.enhencedValidateRequest(challenge, validate, seccode, userid);      } else {          // gt-server非正常情况下，进行failback模式验证          logger.warn("failback:use your own server captcha validate");          gtResult = gtSdk.failbackValidateRequest(challenge, validate, seccode);      }      return gtResult == 1;  }</pre>    <h2><strong>前端页面login.jsp</strong></h2>    <pre>  <!-- 为使用方便，直接使用jquery.js库，如您代码中不需要，可以去掉 -->  <script src="http://code.jquery.com/jquery-1.12.3.min.js"></script>  <!-- 引入封装了failback的接口--initGeetest -->  <script src="http://static.geetest.com/static/tools/gt.js"></script>    <!-- 若是https，使用以下接口 -->  <!-- <script src="https://code.jquery.com/jquery-1.12.3.min.js"></script> -->  <!-- <script src="https://static.geetest.com/static/tools/gt.js"></script> -->    <script>      var handlerPopup = function (captchaObj) {          // 成功的回调          captchaObj.onSuccess(function () {              var validate = captchaObj.getValidate();              $.ajax({                  url: "gt/validate", // 进行二次验证                  type: "post",                  dataType: "json",                  data: {                      username: $('#username1').val(),                      password: $('#password1').val(),                      geetest_challenge: validate.geetest_challenge,                      geetest_validate: validate.geetest_validate,                      geetest_seccode: validate.geetest_seccode                  },                  success: function (data) {                      if (data && (data.status === "success")) {                          $(document.body).html('<h1>登录成功</h1>');                      } else {                          $(document.body).html('<h1>登录失败</h1>');                      }                  }              });          });          $("#popup-submit").click(function () {              captchaObj.show();          });          // 将验证码加到id为captcha的元素里          captchaObj.appendTo("#popup-captcha");          // 更多接口参考：http://www.geetest.com/install/sections/idx-client-sdk.html      };      // 验证开始需要向网站主后台获取id，challenge，success（是否启用failback）      $.ajax({          url: "gt/init?t=" + (new Date()).getTime(), // 加随机数防止缓存          type: "get",          dataType: "json",          success: function (data) {              // 使用initGeetest接口              // 参数1：配置参数              // 参数2：回调，回调的第一个参数验证码对象，之后可以使用它做appendTo之类的事件              initGeetest({                  gt: data.gt,                  challenge: data.challenge,                  product: "popup", // 产品形式，包括：float，embed，popup。注意只对PC版验证码有效                  offline: !data.success // 表示用户后台检测极验服务器是否宕机，一般不需要关注                  // 更多配置参数请参见：http://www.geetest.com/install/sections/idx-client-sdk.html#config              }, handlerPopup);          }      });  </script></pre>    <h2><strong>效果</strong></h2>    <h3><strong>浮动式</strong></h3>    <p style="text-align: center;"><img src="https://simg.open-open.com/show/803b6b61613372ba95fa5ac3cac72c14.png"></p>    <h3><strong>嵌入式</strong></h3>    <p style="text-align: center;"><img src="https://simg.open-open.com/show/b21dae343d2724337ce1bf7d109b80b9.png"></p>    <h3>弹出式</h3>    <p style="text-align: center;"><img src="https://simg.open-open.com/show/19f160d5165ea73831e8b911ac299f50.png"></p>    <h3><strong>移动端形式</strong></h3>    <p style="text-align: center;"><img src="https://simg.open-open.com/show/094d3ceb27d3249979e9f036baf2e26f.png"></p>    <p> </p>    <p> </p>    <p>来自：http://www.jianshu.com/p/d2dadc2c387a</p>    <p> </p>