public static void test_getRedirectUrl() throws Exception {
    String url = "http://weixin.sogou.com/websearch/art.jsp?sg=CBf80b2......";
    String redictURL = getRedirectUrl(url);
    System.out.println(redictURL);
}

/**

1. static String getRedirectUrl(String path) throws Exception {

      HttpURLConnection conn = (HttpURLConnection) new URL(path)
              .openConnection();
      conn.setInstanceFollowRedirects(false);
      conn.setConnectTimeout(5000);
      return conn.getHeaderField("Location");

   }

2. static void main(String[] args) {

      try {
          test_getRedirectUrl();
      } catch (Exception e) {
          e.printStackTrace();
      }

   }