TreePath到java.io.File [英] TreePath to java.io.File
问题描述
有没有简单的方法来获取文件（或 java.nio.file.Path ，为此问题）来自 TreePath ？
Is there any easy way of getting a File (or java.nio.file.Path, for that matter) from a TreePath?
例如，你有一个 JTree 喜欢这样：
For example, you have a JTree like this:
Green
|---Blue
|---Red
|---Yellow
|---Purple.jpg
|---Brown.jpg
|---Black.jpg
如果您有 TreePath 转到 Black.jpg ，有没有办法获得路径<$的文件（或路径） c $ c> Green \Yellow\Black.jpg ？
If you have a TreePath going to Black.jpg, is there a way to get a File (or Path) with path Green\Yellow\Black.jpg?
我可以通过带父母/孩子的方式做到这一点通过一个并逐步构建路径，但我希望可能有一个更优雅的方式...
I can do it the long way, by taking parents/children one by one and constructing the path bit by bit, but I was hoping there might be a more elegant way...
推荐答案
你只需使用短正则表达式和 toString 方法就可以做到这一点，这是一个简单的例子：
You can do this pretty simply with a short regex and the toString method, heres a quick example:
TreePath tp = new TreePath(new String[] {"tmp", "foo", "bar"});
String path = tp.toString().replaceAll("\\]| |\\[|", "").replaceAll(",", File.separator);
File f = new File(path);
// path is now tmp\foo\bar on Windows and tmp/foo/bar on unix
编辑：说明
-
tp.toString（ ）- 这会调用数组的native to string方法，因为这是TreePaths在封面下的表示方式。 返回：[tmp，foo，bar]
tp.toString()- this calls the native to string method of an array, since that is the way TreePaths are represented under the covers. returns:[tmp, foo, bar]
replaceAll（\\] | | \\ [|，） - 这使用简单的正则表达式来替换字符 [和] 并删除空格。字符 | 在JAVA的RegEx风格中意味着或，所以这意味着如果我们遇到左括号，右括号或空格，将其替换为空字符串。 返回： tmp，foo，bar
replaceAll("\\]| |\\[|", "") - this uses a simple regular expression to replace the characters [ and ] and also removes empty spaces. The character | means or in JAVA's flavor of RegEx, so this means "if we encounter a left bracket, right bracket or empty space, replace it the empty string." returns: tmp,foo,bar
.replaceAll（，，File.separator） - 最后一步，这将用本机文件路径分隔符替换逗号。 返回： tmp / foo / bar或tmp \ foobar
.replaceAll(",", File.separator) - the final step, this replaces commas with the native file path separator. returns: tmp/foo/bar or tmp\foobar
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