getPath() getAbsolutePath() getCanonicalPath()不同之处

摘要: What's the difference between getPath(), getAbsolutePath(), and getCanonicalPath() in Java?

import java.io.File;public class PathTesting {
public static void main(String [] args) {
File f = new File("test/.././file.txt");
System.out.println(f.getPath());
System.out.println(f.getAbsolutePath());
try {
System.out.println(f.getCanonicalPath());
}
catch(Exception e) {}
}
}

可以用上面代码测试一下。

Your output will be something like:

test\..\.\file.txt
C:\projects\sandbox\trunk\test\..\.\file.txt
C:\projects\sandbox\trunk\file.txt

getPath()

gets the path string that the

File

object was constructed with, and it may be relative current directory.
总结来看：getPath() 是 获得这个File对象所传入的path 参数。

getAbsolutePath()

gets the path string after resolving it against the current directory if it's relative, resulting in a fully qualified path.
总结来看：getAbsolutePath() 是获得绝对路径，但是不对getPath里面的相对路径进行转换。

getCanonicalPath()

gets the path string after resolving any relative path against current directory, and removes any relative pathing (

.

and

..

), and any file system links to return a path which the file system considers the canonical means to reference the file system object to which it points.
总结来看：getCanonicalPath() 是对getAbsolutePath()中间的相对路径进行转换。