某比赛小记2- 从HTTP请求返回中获得答案

题目：在A页面登录后，重定向到A页面，然后访问B页面，header中带一指定内容"Content"："2018"，然后从response中读取answer的值。

主要分三步分，首先在A页面发送POST请求：

String url = "http://192.168.1.105/";

        String responseMsg = "";

        byte[] responseBody = null;

        HttpClient httpclient = new HttpClient();

        httpclient.getParams().setCookiePolicy(CookiePolicy.BROWSER_COMPATIBILITY);

        httpclient.getParams().setParameter("http.protocol.single-cookie-header", true);

        PostMethod httpPost = new PostMethod(url);

        httpPost.setRequestHeader("ContentType", "application/xml;charset=utf-8");

        String cookie = ".AspNetCore.Antiforgery.2asieuWmzUU=CfDJ8LzDUhYKe7pEsWY4r-H8oTev6zo3ttt4qg9Zo6xNEWNET1tpSwNSHS9SQf2xe1p9witfHgmLnLx1HKCvGsynU6Sv-YMB4u_Pbh0ZAQRoEAJ7KVGH09LsqrBowNV1uh6iU71ealeplU4Yps3td_dBh0I";

        httpPost.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8");

        httpPost.setRequestHeader("Accept-Encoding", "gzip, deflate");

        httpPost.setRequestHeader("Accept-Language", "zh-CN,zh;q=0.9");

        httpPost.setRequestHeader("Cache-Control", "max-age=0");

        httpPost.setRequestHeader("Connection","Keep-Alive");

        httpPost.setRequestHeader("Content-Length", "274");

        httpPost.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

        httpPost.setRequestHeader("Host", "192.168.1.105");

        httpPost.setRequestHeader("Origin", "192.168.1.105");

        httpPost.setRequestHeader("Origin", "http://192.168.1.105");

        httpPost.setRequestHeader("Referer", "http://192.168.1.105/");

        httpPost.setRequestHeader("Upgrade-Insecure-Requests", "1");

        httpPost.setRequestHeader("User-Agent", Constants.USER_AGENT);

        httpPost.setRequestHeader("Cookie", cookie);//ltpatoken+sessionid

        httpclient.getHttpConnectionManager().getParams().setConnectionTimeout(6000000);

        httpclient.getHttpConnectionManager().getParams().setSoTimeout(6000000);

        try {

            httpPost.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,new DefaultHttpMethodRetryHandler(3, false));

    		NameValuePair certsn=new NameValuePair("Input.Email", "yxteng@126.com");

    		NameValuePair certinfo=new NameValuePair("Input.Password", "&wxZC3`jBqo)'qtX");

    		NameValuePair subdn=new NameValuePair("__RequestVerificationToken", "CfDJ8LzDUhYKe7pEsWY4r-H8oTdN9wZgh60Tje5CyRR89Ps2Y67XUzTS7MdnpqmYWOjxqHVytkJq_cV3z8vwvsK6729LWWH1MRlV1QF6tqWRiOGEphxLKkbUxoKQfVEVRRjXV5LTKZafolsgJyOp0YbKnow");

    		NameValuePair ramcode=new NameValuePair("Input.RememberMe", "false");

    		httpPost.setRequestBody(new NameValuePair[]{certsn,certinfo,subdn,ramcode});

    		LogUtils.info("开始登陆...");

            int statusCode = httpclient.executeMethod(httpPost);

			Cookie[] cookies = httpclient.getState().getCookies();

			cookie="";

			for (int i = 0; i < cookies.length; i++) {

				cookie+=cookies[i].toString();

				if(i!=cookies.length-1){

					cookie+=";";

				}

				LogUtils.info(cookies[i].getName()+":"+cookies[i].getValue());

			}

			LogUtils.info("COOKIE:"+cookie);

            if (statusCode == HttpStatus.SC_OK) {

                responseBody = httpPost.getResponseBody();

                LogUtils.info("登陆成功"+statusCode);

            }

            else {

                responseMsg = String.valueOf("statusCode:"+statusCode);

                LogUtils.error("登陆失败"+statusCode);

            }

　　然后get方法模拟重定向到本页：

cookie = ".AspNetCore.Antiforgery.2asieuWmzUU=CfDJ8LzDUhYKe7pEsWY4r-H8oTev6zo3ttt4qg9Zo6xNEWNET1tpSwNSHS9SQf2xe1p9witfHgmLnLx1HKCvGsynU6Sv-YMB4u_Pbh0ZAQRoEAJ7KVGH09LsqrBowNV1uh6iU71ealeplU4Yps3td_dBh0I; .AspNetCore.Identity.Application=CfDJ8LzDUhYKe7pEsWY4r-H8oTfyoqahKhxlTHouYjwJDlVmJ6BdZ8pxXvOLoHDu_Ci9kzyy9GKtpRYYF06bLr3flLY6oiM7ZEJRAH-ARkiwchgjVNWPB2STXkc42E-NtLz94J9RVVhluNbN99JUUCdSXKqQgj0MUq4EpB6D4zF-Diu2wkWjhIty8HxLX4-JG6r3X8XvcJnDyqwt4YgWimcJ_SrIsfS4xdem-9zBK4zPJtorPZZwlOah0IYR7hLd7-2TaJxCk_QvQG5GIaAqRc4A-2I8eR5g6irx9SgI0XIBdxEuqpqUn1er5CIf0olBK3VXtzwNEwDTv8AkDqDvOxw7m9kjkEgDrYs3LmgDpjsg5bgiSrCcfoFx_X_ODp7Q-g5dZLOqYZQxD-bMRy3Uwu97JX-nLqtMLKoY0POhSYX17Y_SH4vFgu9e3I8matifsZAuzKIaT4DFrzyhf_ihi1ffxLnIhYnydMuM27RgrMDNq1EUue1Edym4XUhgxJjKOoiMLg_paJ14l85OXu_M51upCNB4568YKARPVJiT0SCFaA61rYoVOpZaexNLQbxc6kxe0jB5BthCVjU00xpt96QeZPU";

        LogUtils.info("开始跳转首页...");

        url = "http://192.168.1.105/";

        GetMethod httpget = new GetMethod(url);

        httpget.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8");

        httpget.setRequestHeader("Accept-Encoding", "gzip, deflate");

        httpget.setRequestHeader("Accept-Language", "zh-CN,zh;q=0.9");

        httpget.setRequestHeader("Cache-Control", "max-age=0");

        httpget.setRequestHeader("Connection","Keep-Alive");

        httpget.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

        httpget.setRequestHeader("Host", "192.168.1.105");

        httpget.setRequestHeader("Referer", "http://192.168.1.105/");

        httpget.setRequestHeader("Upgrade-Insecure-Requests", "1");

        httpget.setRequestHeader("User-Agent", Constants.USER_AGENT);

        httpget.setRequestHeader("Cookie", cookie);//ltpatoken+sessionid

        statusCode = httpclient.executeMethod(httpget);

        if (statusCode == HttpStatus.SC_OK) {

            responseBody = httpget.getResponseBody();

            LogUtils.info("跳转V成功"+statusCode);

        }

        else {

            responseMsg = String.valueOf("statusCode:"+statusCode);

            LogUtils.error("跳转V失败"+statusCode);

            return;

        }

　　最后访问目标页，header中带上指定内容：

url = "http://192.168.1.105/Problems/HttpRequest";

        httpget = new GetMethod(url);

        httpget.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8");

        httpget.setRequestHeader("Accept-Encoding", "gzip, deflate");

        httpget.setRequestHeader("Accept-Language", "zh-CN,zh;q=0.9");

        httpget.setRequestHeader("Cache-Control", "max-age=0");

        httpget.setRequestHeader("Connection","Keep-Alive");

        httpget.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

        httpget.setRequestHeader("Host", "192.168.1.105");

        httpget.setRequestHeader("Referer", "http://192.168.1.105/");

        httpget.setRequestHeader("Upgrade-Insecure-Requests", "1");

        httpget.setRequestHeader("Content", "2018");//秘钥

        httpget.setRequestHeader("User-Agent", Constants.USER_AGENT);

        httpget.setRequestHeader("Cookie", cookie);//ltpatoken+sessionid

        statusCode = httpclient.executeMethod(httpget);

        if (statusCode == HttpStatus.SC_OK) {

        	Header[] hlist= httpget.getResponseHeaders();

        	for(Header h:hlist){

        		LogUtils.info(h.getName()+":"+h.getValue());

        	}

            LogUtils.info("跳转V成功"+statusCode+responseBody);

        }

        else {

            responseMsg = String.valueOf("statusCode:"+statusCode);

            LogUtils.error("跳转V失败"+statusCode+responseBody);

            return;

        }

　　在控制台中查看答案即可。

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某比赛小记2- 从HTTP请求返回中获得答案

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