如何检查路径在java中是否存在？
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How to Check Path is existing or not in java?
提问by raja
I have a java program which take path as argument. I want to check whether given path is existing or not before doing other validation. Eg: If i give a path D:\Log\Sample which is not not exist, it has to throw filenotfound exception. How can i do that?
我有一个以路径为参数的java程序。我想在进行其他验证之前检查给定的路径是否存在。例如：如果我给出一个不存在的路径 D:\Log\Sample，它必须抛出 filenotfound 异常。我怎样才能做到这一点？
回答by mP.
new File( path ).exists().
新文件（路径）。存在（）。
Read the javadoc its very useful and often gives many useful examples.
阅读 javadoc 非常有用，并且经常给出很多有用的例子。
回答by Zach Scrivena
if (!new File("D:\Log\Sample").exists())
{
throw new FileNotFoundException("Yikes!");
}
Besides File.exists(), there are also File.isDirectory()and File.isFile().
回答by Romain Linsolas
The class java.io.File can take care of that for you:
类 java.io.File 可以为您处理：
File f = new File("....");
if (!f.exists()) {
// The directory does not exist.
...
} else if (!f.isDirectory()) {
// It is not a directory (i.e. it is a file).
...
}
