如何验证远程服务器上文件是否存在

java.net.URL url = null;

java.net.URLConnection urlCon;

try {

url = new java.net.URL("http://服务器IP:端口/upload/ABC.doc");

urlCon = url.openConnection();

String message = urlCon.getHeaderField(0);

System.out.println(message);//文件存在打印‘HTTP/1.1 200 OK’ 文件不存在打印 ‘HTTP/1.1 404 Not Found’

} catch (java.net.MalformedURLException e0) {

} catch (java.io.IOException ie3) {

}