关于httpclient模拟登录后抓取教务系统信息的问题

最近在写一个自助学生查询的服务，因此需要些一个爬虫抓取学生在教务系统的一些信息，在经过模拟登陆到达主页面后，当我请求学生的个人信息时时发现总是被302重定向而且地址为空，我的代码如下：请假各位这是怎么一回事
List<NameValuePair>list=new ArrayList<NameValuePair>();
list.add(new BasicNameValuePair("xh","xxxxx"));
list.add(new BasicNameValuePair("xm","xxxxxx"));
list.add(new BasicNameValuePair("gnmkdm","N121501"));

String s = URLEncodedUtils.format(list,"GB2312");
HttpGet get=new HttpGet("http://59.74.168.16:8989/content.aspx");
System.out.println(s);
get.setHeader("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8");
get.setHeader("Accept-Encoding","gzip, deflate");
get.setHeader("Accept-Language","zh-CN,zh;q=0.8");
get.setHeader("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.79 Safari/537.36");
get.setHeader("Cookie","ASP.NET_SessionId=wqsf4h2hsmx3qi45nada2045");
get.setHeader("Referer","http://59.74.168.14:8989/xs_main.aspx?xh=1510050128");
get.setHeader("Upgrade-Insecure-Requests","1");
get.setHeader("Connection","keep-alive");
get.setHeader("Host","59.74.168.14:8989");


CloseableHttpResponse rep=httpclient.execute(get);
get.setHeader("Referer","http://59.74.168.14:8989/xs_main.aspx?xh=1510050128");
Header[]heads=hg.getAllHeaders();
System.out.println("------");
for(Header head:heads){
System.out.println(head.getValue());
}
System.out.println("-------");

if(rep.getStatusLine().getStatusCode()==200){
System.out.println("success");
}
else{
System.out.println(rep.getStatusLine().toString());
}
另外我抓取的是正方教务管理系统，并且发现get请求执行后Referer的值发生变化，请各位帮忙俺看