Java爬虫网站521返回加密js

爬取加速乐处理的网站

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• 用postman直接访问导致521且返回加密js
• 运用java中的ScriptEngineManager脚本引擎处理拿到cookie
  代码如下：

            CloseableHttpClient client = HttpClients.createDefault();
            HttpGet get = new HttpGet(url);
            //模拟浏览器
            get.setHeader("Accept", "Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
            get.setHeader("Accept-Charset", "GB2312,utf-8;q=0.7,*;q=0.7");
            get.setHeader("Accept-Encoding", "gzip, deflate");
            get.setHeader("Accept-Language", "zh-cn,zh;q=0.5");
            get.setHeader("Connection", "keep-alive");
            get.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; rv:6.0.2) Gecko/20100101 Firefox/6.0.2");
            CloseableHttpResponse response = client.execute(get);
            //请求返回521
            if(response.getStatusLine().getStatusCode()==521){
                HttpEntity entity = response.getEntity();
                String resHtml = EntityUtils.toString(entity);

                //对返回js处理 拿到jsl_clearance 
                String jsl_clearance = getJslClearance(resHtml);;
                get.setHeader("Cookie",jsl_clearance);
                response = client.execute(get);
            }
            //拿到最终想要的页面
            HttpEntity entity = response.getEntity();
            String res = EntityUtils.toString(entity,"utf-8");
            Document doc = Jsoup.parse(res);
          
           /**
             * 获取加密cookie
             * @param body
            */
            private static String getJslClearance(String body) {
                String jsl_clearance = "";
                ScriptEngineManager manager = new ScriptEngineManager();
                //得到脚本引擎
                ScriptEngine engine = manager.getEngineByName("JavaScript");
                //处理加密js
                String js = body.trim().replace("<script>", "")
                    .replace("</script>", "")
                    .replace("eval(y.replace(/\\b\\w+\\b/g, function(y){return x[f(y,z)-1]||(\"_\"+y)}))",
                        "y.replace(/\\b\\w+\\b/g, function(y){return x[f(y,z)-1]||(\"_\"+y)})");
                try {
                    //得到解密后的js
                    String result = (String) engine.eval(js);

                    String jsl_pre = result.substring(result.indexOf("__jsl_clearance=") + 16,
                          result.indexOf("|'+(function(){var") + 1);
                     String bac = (result.substring(result.indexOf("|'+(function(){"), result.indexOf("+';Expires=") - 23)
                              + result.substring(result.indexOf("+';Expires=") - 16, result.indexOf("+';Expires=") - 4))
                              .replace("|'+(function(){", "").replaceAll("window", "'Chrome'");
                      String jsl_bac = (String) engine.eval(bac);
                      jsl_clearance = "__jsl_clearance=" +jsl_pre + jsl_bac+";";
                      logger.debug(jsl_clearance);
                  } catch (ScriptException e) {
                      e.printStackTrace();
                  }
                  return jsl_clearance;
              }

随后访问成功。