Java中存在冲突的文件，URI和URL [英] Files, URIs, and URLs conflicting in Java

问题描述

尝试在文件和URL之间进行转换时，我遇到了一些奇怪的行为，特别是当文件/路径名称中包含空格时。有没有安全的方法在两者之间进行转换？

I am getting some strange behavior when trying to convert between Files and URLs, particularly when a file/path has spaces in its name. Is there any safe way to convert between the two?

我的程序有一个文件保存功能，其中实际的保存操作被委托给需要URL的外部库作为参数。但是，我还希望用户能够选择要保存的文件。问题是，当在File和URL之间进行转换时（使用URI），空格显示为％20并且搞乱了各种操作。请考虑以下代码：

My program has a file saving functionality where the actual "Save" operation is delegated to an outside library that requires a URL as a parameter. However, I also want the user to be able to pick which file to save to. The issue is that when converting between File and URL (using URI), spaces show up as "%20" and mess up various operations. Consider the following code:

//...user has selected file
File userFile = myFileChooser.getSelectedFile();
URL userURL = userFile.toURI().toURL();

System.out.println(userFile.getPath());
System.out.println(userURL);

File myFile = new File(userURL.getFile());

System.out.println(myFile.equals(userFile);

这将返回false（由于％20符号），并且在我的程序中导致严重问题，因为文件和URL被切换，并且通常必须使用它们执行操作（如获取父/子目录）。是否有如何使文本/ URL处理对于具有空格的路径安全？

This will return false (due to the "%20" symbols), and is causing significant issues in my program because Files and URLs are handed off and often operations have to be performed with them (like getting parent/subdirectories). Is there a way to make File/URL handling safe for paths with whitespace?

PS如果我的路径中没有空格（路径看起来相同），那么一切正常，但是是我不能强加的用户限制。

P.S. Everything works fine if my paths have no spaces in them (and the paths look equal), but that is a user restriction I cannot impose.

推荐答案

问题是您使用URL构建第二个文件：

The problem is that you use URL to construct the second file:

File myFile = new File(userURL.getFile());

如果您坚持使用URI，那么您最好：

If you stick to the URI, you are better off:

URI userURI = userFile.toURI();
URL userURL = userURI.toURL();
...
File myFile = new File(userURI);

或

File myFile = new File( userURL.toURI() );

当用空格测试文件名时，这两种方式都适用于我。

Both ways worked for me, when testing file names with blanks.

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