blocks|key|4251921|text|仅从您不能使用的URL来看，就可以考虑以下URL：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4251922|4251923|http://host1/index.html|unordered-list-item|offset|length|4251924|http://host2/index.php|4251925|http://host3/index.asp|4251926|http://host4/index.jsp|4251927|http://host5/index.aspx|4251928|Or此问题的url+-+How+do+you+determine+if+a+file+is+html+from+the+URL?|4251929|4251930|它们都返回HTML内容。唯一可靠的方法是向服务器请求资源，并检查Content-TYpe头。最好使用向服务器发送HEAD请求，而不是GET或POST+-它只会给你头部，而不是内容。|4251931|++URL+url+=+...
++HttpURLConnection+urlc+=+(HttpURLConnection)url.openConnection();
++urlc.setAllowUserInteraction(+false+);
++urlc.setDoInput(+true+);
++urlc.setDoOutput(+false+);
++urlc.setUseCaches(+true+);
++urlc.setRequestMethod("HEAD");
++urlc.connect();
++String+mime+=+urlc.getContentType();
++if(mime.equals("text/html")+{
++++//+do+your+stuff
++}|code-block|syntax|javascript|4251932|entityMap|0|LINK|mutability|MUTABLE|url|1|2|3|4|5|https://stackoverflow.com/questions/1065503/how-do-you-determine-if-a-file-is-html-from-the-url^0|0|0|0|N|0|0|0|M|1|0|0|M|2|0|0|M|3|0|0|N|4|0|C|1G|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1E|8|@]|9|@$F|1F|G|1G|1|1H]]|A|$]]|$1|H|3|I|5|E|7|1I|8|@]|9|@$F|1J|G|1K|1|1L]]|A|$]]|$1|J|3|K|5|E|7|1M|8|@]|9|@$F|1N|G|1O|1|1P]]|A|$]]|$1|L|3|M|5|E|7|1Q|8|@]|9|@$F|1R|G|1S|1|1T]]|A|$]]|$1|N|3|O|5|E|7|1U|8|@]|9|@$F|1V|G|1W|1|1X]]|A|$]]|$1|P|3|Q|5|E|7|1Y|8|@]|9|@$F|1Z|G|20|1|21]]|A|$]]|$1|R|3|-4|5|6|7|22|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|23|8|@]|9|@]|A|$]]|$1|U|3|V|5|W|7|24|8|@]|9|@]|A|$X|Y]]|$1|Z|3|-4|5|6|7|25|8|@]|9|@]|A|$]]]|10|$11|$5|12|13|14|A|$15|D]]|16|$5|12|13|14|A|$15|I]]|17|$5|12|13|14|A|$15|K]]|18|$5|12|13|14|A|$15|M]]|19|$5|12|13|14|A|$15|O]]|1A|$5|12|13|14|A|$15|1B]]]]

Just from the URL you cannot, think of the following urls:

<ul>
<li><a href="http://host1/index.html" rel="nofollow noreferrer">http://host1/index.html</a></li>
<li><a href="http://host2/index.php" rel="nofollow noreferrer">http://host2/index.php</a></li>
<li><a href="http://host3/index.asp" rel="nofollow noreferrer">http://host3/index.asp</a></li>
<li><a href="http://host4/index.jsp" rel="nofollow noreferrer">http://host4/index.jsp</a></li>
<li><a href="http://host5/index.aspx" rel="nofollow noreferrer">http://host5/index.aspx</a></li>
<li>Or the the url of this question - <a href="https://stackoverflow.com/questions/1065503/how-do-you-determine-if-a-file-is-html-from-the-url">How do you determine if a file is html from the URL?</a></li>
</ul>

All of them return HTML content. The only sure way is to ask the server for the resource, and check the Content-TYpe header. It is better to use to send an HEAD request to the server, instead of GET or POST - it will give you just the headers and without the content.

<pre><code> URL url = ...
 HttpURLConnection urlc = (HttpURLConnection)url.openConnection();
 urlc.setAllowUserInteraction( false );
 urlc.setDoInput( true );
 urlc.setDoOutput( false );
 urlc.setUseCaches( true );
 urlc.setRequestMethod("HEAD");
 urlc.connect();
 String mime = urlc.getContentType();
 if(mime.equals("text/html") {
 // do your stuff
 }
</code></pre>

blocks|key|1034296|text|您不能。但是您可以向服务器请求标头，并检查内容类型以查看它是否是text/html。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1034297|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

you can't. but you can ask the server for headers and check the content type to see if it is text/html.

blocks|key|1379994|text|你不能。使用以.jpeg、.gif甚至.mp3结尾的urls提供html文件并没有什么错。唯一知道的方法是获取url并查看Content-Type头，看看它是否是text/html+(但由于web服务器配置不佳，这甚至不是100%25准确)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1379995|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You can not. There is nothing wrong with serving up html files with urls that end in .jpeg, or .gif or even .mp3. The only way to know is to fetch the url and view the Content-Type header to see if it is text/html (but that isn't even 100% accurate because of poorly configured web servers).

blocks|key|1380046|text|从根本上说，URL只是一个地址。有许多有用的、有意义的约定可以用来破译它们可能包含的内容，但归根结底，when服务器可以自由地返回给定URL的任何类型的内容。甚至不查询服务器，询问返回的内容，并检查它，就可以100%25确定它是哪种类型的文件。服务器可以很容易地根据请求、时间或日期或所有者的突发奇想来更改它指向的文件类型。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1380047|有一些很好的基本指南在大多数情况下都有效，但我甚至不愿提及它们，因为它们绝对不可靠。|1380048|不过，也有一些好消息。如果您实际从服务器请求数据，就像其他一些答案指出的那样，它将准确地告诉您它为您提供了什么类型的东西(对于这个特定的交换)。它将在名为"Content-Type“的字段中给出一个MIME-Type。如果它是text/+html，那么您就有了一个HTML文档(不是图像，也不是xhtml文档，HTML)。|1380049|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Fundamentally, a URL is merely an address. There are plenty of useful, meaningful conventions that you can use to decipher what they might contain, but when it comes down to it, a webserver is free to return any type of thing it wants for a given URL. Not even querying the server, asking for what comes back, and examining it is a 100% surefire way of knowing what sort of file it is. The server could easily change what sort of file it points to based on the request, or the time or day, or the whims of its owner.

There are some good basic guidelines that will work most of the time, but I hesitate to even mention them because they're absolutely not reliable.

There is some good news, though. If you actually request the data from the server, it will, just as some other answers point out, tell you precisely what sort of thing it is providing you with (for this particular exchange). It'll give you a MIME-Type in the field named "Content-Type". If it's text/html, then you have yourself an html document (not an image, not an xhtml document, HTML).

blocks|key|1034356|text|简而言之。你不能这么做。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1034357|有一些REST样式的URL，比如|1034358|http://yourserver.com/service/givemehtml/|offset|length|1034359|为你服务的html。|1034360|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|15|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@$F|T|G|U|1|V]]|A|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|E]]]]

Put simply. You can't.

There are REST-style URL's like

<a href="http://yourserver.com/service/givemehtml/" rel="nofollow noreferrer">http://yourserver.com/service/givemehtml/</a>

which serve you html.

blocks|key|79651|text|html+-超文本标记语言，即HTML是一种标准，引用*.html意味着有静态的html页面，其他的*.jsp、*.php、*.asp等，它们生成动态的HTML。所以你找不到，你可以尝试查看内容类型，但这样你仍然会错过一些页面。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|79652|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

HTML - Hyper Text Markup Language, that means html is a standard, referencing *.html meaning there is static HTML page all, other *.jsp, *.php, *.asp and etc, They generates dynamic html. So you cannot find out, you can try to look on content-type, but this way you still will miss some pages.

blocks|key|1034554|text|你不能。有时一些网址以.html扩展名结尾，但实际上它不是一个html文件。就像在spring操作中，我通常使用扩展.html，所以它看起来像url中的html文件，但事实并非如此。所以实际上你不能确定它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1034555|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You can't. Sometimes some URL ends with .html extension, but it actually not a html files. Like in spring actions I normally use extension .html, so it looks like html file from url, but it is not. So practically you can't determine it.

Given a URL, how can you tell if the referenced file is and html file? 

Obviously, its an html file if it ends in .html or /, but then there are .jsp files, too, so I'm wondering what other extensions may be out there for html.

Alternatively, if this information can be easily gained from a URL object in Java, that would be sufficient for my purposes.

How do you determine if a file is html from the URL?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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给定一个URL，如何判断引用的文件是否是html文件？显然，如果它以.html或/结尾，那么它就是一个html文件，但是也有.jsp文件，所以我想知道html的其他扩展名可能是什么。或者，如果可以很容易地从Java中的URL对象获得此信息，那么这就足够了。

问如何根据URL确定文件是否为html？
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问如何根据URL确定文件是否为html？
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