在 URL 和 Windows 文件名（Java）之间转换？
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Convert between URL and windows filename (Java)?
提问by Paul
Is there a standard/good way of converting between urls and windows filenames, in Java?
在 Java 中，是否有在 url 和 windows 文件名之间进行转换的标准/好方法？
I am trying to download files, but I want the windows filename to be convertible back to the original filename. Note that the query portion of the url is vital, as I will be downloading different pages that differ only in query.
我正在尝试下载文件，但我希望 Windows 文件名可以转换回原始文件名。请注意，url 的查询部分至关重要，因为我将下载仅在查询上有所不同的不同页面。
My current hacky solution is to replace illegal characters (such as '?') with a specific string (such as 'QQ'), but this makes conversion back to url less transparent. Is there a better way?
我目前的 hacky 解决方案是用特定的字符串（例如 'QQ'）替换非法字符（例如 '?'），但这会使转换回 url 的透明度降低。有没有更好的办法？
回答by McDowell
You could do worse than use URLEncoderto encode the URL:
您可能比使用URLEncoder对 URL 进行编码更糟糕：
String url = "http://172.0.0.1:80/foo/bar/baz.txt?black=white";
String filename = URLEncoder.encode(url, "UTF-8");
File file = new File(filename);
The filename becomes the legal win32 name:
文件名成为合法的 win32 名称：
http%3A%2F%2F172.0.0.1%3A80%2Ffoo%2Fbar%2Fbaz.txt%3Fblack%3Dwhite
This is a reversible operation:
这是一个可逆操作：
String original = URLDecoder.decode(filename, "UTF-8");
回答by Jé Queue
The java.io.File class takes a URI &| filename as a constructor, but contains toURI()& toURL()methods as well as getName()& getPath(). I assume this would be a valid conversion for you?
java.io.File 类采用 URI &| filename 作为构造函数，但包含toURI()&toURL()方法以及getName()& getPath()。我认为这对你来说是一个有效的转换？
回答by Paulius
But is it possible to encode url to filename at all? I mean, can there be the 100% valid solution? I think that converting url to filename is the wrong idea in general, because of different limitations set on urls and filenames:
但是有可能将 url 编码为文件名吗？我的意思是，可以有 100% 有效的解决方案吗？我认为将 url 转换为文件名通常是错误的想法，因为对 url 和文件名设置了不同的限制：
Max filename length (NTFS filesystem, Unicode, using UTF-16 encoding) - 255
最大文件名长度（NTFS 文件系统，Unicode，使用 UTF-16 编码）- 255
回答by OscarRyz
If you mean to convert an URL encoded to non encoder you could use:
如果您打算将编码的 URL 转换为非编码器，您可以使用：
Utility class for HTML form decoding. This class contains static methods for decoding a String from the application/x-www-form-urlencoded MIME format.
用于 HTML 表单解码的实用程序类。此类包含用于从 application/x-www-form-urlencoded MIME 格式解码字符串的静态方法。
See if that's what you need.
看看这是否是你需要的。
