java 我可以检查一个文件是否存在于一个 URL 中？

can I check if a file exists at a URL?

提问by senzacionale

can I check if a file exists at a URL?

我可以检查一个文件是否存在于一个 URL 中？

This link is very good for C#, what about java. I serach but i did not find good solution.

这个链接对C#很好，java呢。我搜索但我没有找到好的解决方案。

回答by

It's quite similar in Java. You just need to evaluate the HTTP Response code:

它在 Java 中非常相似。您只需要评估 HTTP 响应代码：

final URL url = new URL("http://some.where/file.html");
url.openConnection().getResponseCode();

A more complete example can be found here.

可以在此处找到更完整的示例。

回答by Han

Contributing a clean version that's easier to copy and paste.

提供一个更易于复制和粘贴的干净版本。

try {
    final URL url = new URL("http://your/url");
    HttpURLConnection huc = (HttpURLConnection) url.openConnection();
    int responseCode = huc.getResponseCode();
    // Handle response code here...
} catch (UnknownHostException uhe) {
    // Handle exceptions as necessary
} catch (FileNotFoundException fnfe) {
    // Handle exceptions as necessary
} catch (Exception e) {
    // Handle exceptions as necessary
}