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File 类的 getPath()，getAbsolutePath()，getCanonicalPath() 区别

2020/11/01

getPath()

gets the path string that the File object was constructed with, and it may be relative current directory.

返回的是定义时的路径，可能是相对路径，也可能是绝对路径，这个取决于定义时用的是相对路径还是绝对路径。如果定义时用的是绝对路径，那么使用 getPath() 返回的结果跟用 getAbsolutePath() 返回的结果一样。

getAbsolutePath()

gets the path string after resolving it against the current directory if it’s relative, resulting in a fully qualified path.

返回的是定义时的路径对应的相对路径，但不会处理 “.” 和 “..” 的情况。

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.

返回的是规范化的绝对路径，相当于将 getAbsolutePath() 中的 “.” 和 “..” 解析成对应的正确的路径。

代码示例

File file = new File("./test.txt");
System.out.println(file.getPath()); // ./test.txt
System.out.println(file.getAbsolutePath()); // /tmp/Test/./test.txt
System.out.println(file.getCanonicalPath()); // /tmp/Test/test.txt

参考

https://www.bbsmax.com/A/A2dmAEbden/

https://my.oschina.net/u/2308739/blog/666426

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