HttpClient4.4.1模拟登录知乎

这部分可以使用Wireshark工具来抓包就可以了，发现需要以下数据:

"_xsrf" = xxxx(这是一个变动的数据，需要先活取获取知乎首页源码来获得)"email" = 邮箱"passWord" = 密码"rememberme" = "y"(或者n也可以)

• 获取_xsrf数据:

  String xsrfValue = responseHtml.split("<input type=/"hidden/" name=/"_xsrf/" value=/"")[1].split("/"/>")[0];

  responseHtml是首页的源码，根据网页的组织形式，把_xsrf数据分割出来。

RequestConfig requestConfig = RequestConfig.custom().setCookieSpec(CookieSpecs.STANDARD_STRICT).build();        CloseableHttpClient httpClient = HttpClients.custom().setDefaultRequestConfig(requestConfig).build();        HttpGet get = new HttpGet("http://www.zhihu.com/");        try {            CloseableHttPResponse response = httpClient.execute(get);            String responseHtml = EntityUtils.toString(response.getEntity());            String xsrfValue = responseHtml.split("<input type=/"hidden/" name=/"_xsrf/" value=/"")[1].split("/"/>")[0];            System.out.println("xsrfValue:" + xsrfValue);            response.close();            List<NameValuePair> valuePairs = new LinkedList<NameValuePair>();            valuePairs.add(new BasicNameValuePair("_xsrf" , xsrfValue));            valuePairs.add(new BasicNameValuePair("email", 邮箱));            valuePairs.add(new BasicNameValuePair("password", 密码));            valuePairs.add(new BasicNameValuePair("rememberme", "y"));            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(valuePairs, Consts.UTF_8);            HttpPost post = new HttpPost("http://www.zhihu.com/login");            post.setEntity(entity);            httpClient.execute(post);//登录            HttpGet g = new HttpGet("http://www.zhihu.com/question/following");            CloseableHttpResponse r = httpClient.execute(g);//获取子集关注的问题页面测试一下是否登陆成功            System.out.println(EntityUtils.toString(r.getEntity()));            r.close();        } catch (IOException e) {            e.printStackTrace();        } finally {            try {                httpClient.close();            } catch (IOException e) {                e.printStackTrace();            }        }

此处要注意开头的RequestConfig，我一开始是没有设置cookie这方面的额内容的，结果一直提示有cookie错误，所以查看了HttpClient手册，上面提到了选择Cookie策略,通过这种方法设置一个全局的Cookie策略，

RequestConfig requestConfig = RequestConfig.custom().setCookieSpec(CookieSpecs.STANDARD_STRICT).build();//标准Cookie策略CloseableHttpClient httpClient = HttpClients.custom().setDefaultRequestConfig(requestConfig).build();//设置进去