获取FileInputStream使用的文件 [英] Getting the file used by a FileInputStream

问题描述

是否可以获取FileInputStream正在使用的File? FileInputStream似乎没有任何检索它的方法.

Is it possible to obtain the File being used by a FileInputStream? FileInputStream does not appear to have any methods for retrieving it.

推荐答案

FileInputStream API中没有直接方法，但是如果您确实需要，可以使用Java Reflection API获取path(实际文件名).完整路径)，如下所示:

There are no direct methods in FileInputStream API, but if you really wanted, you can use java reflection API to get the path (actual file name with full path) as shown below:

FileInputStream fis = new FileInputStream(inputFile);
Field field = fis.getClass().getDeclaredField("path");
field.setAccessible(true);
String path  = (String)field.get(fis);
System.out.println(path);

path变量(带有路径的文件名)在FileInputStream类中声明为私有的final字段，我们使用上面显示的反射代码来获取它.

The path variable (holds the file name with path) is declared in the FileInputStream class as a private final field, which we are getting it using reflections code as shown above.

PS: 您需要注意，由于规范中未定义上述方法，因此不能保证上述方法在所有JVM实现中都能达到结果.

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