后台模拟登录CAS

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后台模拟登录CAS0

我在后台用httpservlet用httpclient4生成一个post请求模拟CAS登录，CAS显示登录成功了TGT和ST都生成成功了，我直接servlet的response重定向这个POST返回的location，在jetty中我的单点登录可以识别ST并且成功进入系统，但是打包到tomcat下运行的时候CAS提示TICKET_VALIDATED_FAILD票据验证错误，请问这是什么原因

问题补充：@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// getClientToLogin(req, resp);
String username = (String) req.getParameter("username");
String password = (String) req.getParameter("password");
String basePath = req.getScheme() + "://" + req.getServerName() + ":"
+ req.getServerPort() + req.getContextPath() + "/";
String service = basePath + "static/frame";
String clientLoginUrl = basePath + "index.jsp";

ClientFactory client = ClientFactory.getInstance();
List<NameValuePair> parameters = new ArrayList<NameValuePair>();
parameters.add(new BasicNameValuePair("username", username));
parameters.add(new BasicNameValuePair("password", password));
parameters.add(new BasicNameValuePair("service", service));
parameters
.add(new BasicNameValuePair("clientLoginUrl", clientLoginUrl));

HttpCallbackObject callback = client.remoteLogin(parameters);
HttpResponse response = callback.getResponse();
HttpClient httpClient = callback.getClient();
String redirectUrl = null;
if (response.getStatusLine().getStatusCode() == 302) {
Header locationHeader = response.getFirstHeader("location");
redirectUrl = locationHeader.getValue();
}
httpClient.getConnectionManager().shutdown();
log.info("remote login redirect to : " + redirectUrl);
// resp.sendRedirect(redirectUrl);

HttpClient clientGet = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(redirectUrl);
HttpResponse respGet = clientGet.execute(httpGet);
log.info("respGet status code : "
+ respGet.getStatusLine().getStatusCode());
if (respGet.getStatusLine().getStatusCode() == 200) {
EntityUtils.consume(respGet.getEntity());
}
clientGet.getConnectionManager().shutdown();

resp.sendRedirect(redirectUrl);
return;
}