java HttpClient模拟登陆知乎问答网站，获取不到cookie

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java HttpClient模拟登陆知乎问答网站，获取不到cookie10

java HttpClient模拟登陆知乎问答网站，获取不到cookie
求解？？？？？？
form表单action 地址是https://www.zhihu.com
代码如下：

public static void main(String[] args){
	String loginUrl = "http://www.zhihu.com";
	String username = "XXXXXXXXXXXX";
	String password = "XXXXXXXXXXXX";
	String htmlGetSource = "";
	HttpClient httpClient = new DefaultHttpClient();

	httpClient.getParams().setParameter(CoreProtocolPNames.USER_AGENT, "Mozilla/5.0 (X11; U; Linux i686; zh-CN; rv:1.9.1.2) Gecko/20090803 Fedora/3.5.2-2.fc11 Firefox/3.5.2");
	//获取登录框的隐含参数 type="hidden" name="_xsrf"
	try {
		HttpGet httpGet = new HttpGet(loginUrl);
		HttpResponse response = httpClient.execute(httpGet);
		HttpEntity entity = response.getEntity();
		if(entity!=null){
			InputStream in = entity.getContent();
			String str = "";
			BufferedReader br = new BufferedReader(new InputStreamReader(in,"UTF-8"));
			while((str=br.readLine())!=null){
				htmlGetSource += str+"\n";
			}
		}
	} catch (ClientProtocolException e1) {
		e1.printStackTrace();
	} catch (IOException e1) {
		e1.printStackTrace();
	}
	//应用JsoupHtml解析包解析html包含参数
	Document doc = Jsoup.parse(htmlGetSource);
	Element formContent = null;
	Element inputContent = null;
	String actionStr = "";
	String _xsrf="";
	String checked = "on";
	formContent  = doc.select("form[method=post]").first();
	inputContent = doc.select("input[type=hidden]").first();
	actionStr = formContent.attr("action");
	_xsrf = inputContent.attr("value");
	System.out.println(actionStr);

	HttpPost httpPost = new HttpPost(actionStr);
	HttpResponse response;
	//请求Header
	httpPost.setHeader("(Request-Line)","POST /login HTTP/1.1");
	httpPost.setHeader("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0.1");  
	httpPost.setHeader("Referer", "http://www.zhihu.com/");  
	httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded");  
	httpPost.setHeader("Accept-Language","zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3");
	httpPost.setHeader("Accept-Encoding","gzip, deflate");
	httpPost.setHeader("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
	httpPost.setHeader("Connection","keep-alive");
	//POST参数
	List<NameValuePair> nvps = new ArrayList<NameValuePair>();
	nvps.add(new BasicNameValuePair("_xsrf", _xsrf));
	nvps.add(new BasicNameValuePair("email", username));
	nvps.add(new BasicNameValuePair("password", password));
	nvps.add(new BasicNameValuePair("rememberme", "on"));
	
	try {
		httpPost.setEntity(new UrlEncodedFormEntity(nvps,HTTP.UTF_8));
		response = httpClient.execute(httpPost);
		//Header[] headers = response.getAllHeaders();
		//for(Header h:headers){
		//	System.out.println(h);
		//}
		//得到cookie  
		String set_cookie = response.getFirstHeader("Set-Cookie").getValue();
		System.out.println(set_cookie);
	} catch (UnsupportedEncodingException e) {
		e.printStackTrace();
	} catch (IOException e) {
		e.printStackTrace();
	} finally {
		httpPost.abort();
	}
}

HttpClient