HttpURLConnection con = null;

try {
    String url ="http://.。。。.com";

    // 获取文件流
    con = (HttpURLConnection) new URL(url).openConnection();
    con.setConnectTimeout(15000);
    con.setReadTimeout(15000);
    con.setInstanceFollowRedirects(false);
     if (con.getResponseCode() == 302) {
        //如果会重定向，保存302重定向地址，以及Cookies,然后重新发送请求(模拟请求)
        String location = con.getHeaderField("Location");
         con.disconnect();
         url = location;
         con = (HttpURLConnection) new URL(url).openConnection();
         con.setConnectTimeout(15000);
         con.setReadTimeout(15000);
      }

}
catch (IOException e) {
 
}