File.separator vs. File.pathSeparator

最新推荐文章于 2021-02-13 18:59:10 发布

Mr.Z_z

最新推荐文章于 2021-02-13 18:59:10 发布

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本文详细介绍了Java中文件路径分隔符的概念及其在不同操作系统上的表现形式，并通过示例代码展示了如何正确使用这些分隔符以实现跨平台兼容性。

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java.io.File class contains four static separator variables. For better understanding, Let's understand with the help of some code

separator: Platform dependent default name-separator character as String. For windows, it’s ‘\’ and for unix it’s ‘/’
separatorChar: Same as separator but it’s char
pathSeparator: Platform dependent variable for path-separator. For example PATH or CLASSPATH variable list of paths separated by ‘:’ in Unix systems and ‘;’ in Windows system
pathSeparatorChar: Same as pathSeparator but it’s char

Note that all of these are final variables and system dependent.

Here is the java program to print these separator variables. FileSeparator.java

import java.io.File;

public class FileSeparator {

    public static void main(String[] args) {
        System.out.println("File.separator = "+File.separator);
        System.out.println("File.separatorChar = "+File.separatorChar);
        System.out.println("File.pathSeparator = "+File.pathSeparator);
        System.out.println("File.pathSeparatorChar = "+File.pathSeparatorChar);
    }

}

Output of above program on Unix system:

File.separator = /
File.separatorChar = /
File.pathSeparator = :
File.pathSeparatorChar = :

Output of the program on Windows system:

File.separator = \
File.separatorChar = \
File.pathSeparator = ;
File.pathSeparatorChar = ;

To make our program platform independent, we should always use these separators to create file path or read any system variables like PATH, CLASSPATH.

Here is the code snippet showing how to use separators correctly.

//no platform independence, good for Unix systems
File fileUnsafe = new File("tmp/abc.txt");
//platform independent and safe to use across Unix and Windows
File fileSafe = new File("tmp"+File.separator+"abc.txt");

from http://stackoverflow.com/questions/27746419/file-separator-vs-file-pathseparator