Java，从当前目录中读取文件？ [英] Java, reading a file from current directory?

问题描述

我想要一个从当前目录（运行.class文件的同一目录）读取用户指定文件名的java程序。

I want a java program that reads a user specified filename from the current directory (the same directory where the .class file is run).

换句话说，如果用户将文件名指定为myFile.txt，并且该文件已在当前目录中：

In other words, if the user specifies the file name to be "myFile.txt", and that file is already in the current directory:

reader = new BufferedReader(new FileReader("myFile.txt"));

不起作用。为什么？

我在Windows中运行它。

I'm running it in windows.

推荐答案

当前目录不是（必然）.class文件所在的目录。它是进程的工作目录。 （即：启动JVM时所在的目录）

The current directory is not (necessarily) the directory the .class file is in. It's working directory of the process. (ie: the directory you were in when you started the JVM)

您可以从同一目录 ^* 加载文件作为.class文件使用 getResourceAsStream（） 。这将为您提供一个InputStream，您可以使用 InputStreamReader 。

You can load files from the same directory^* as the .class file with getResourceAsStream(). That'll give you an InputStream which you can convert to a Reader with InputStreamReader.

_{^* 请注意这个目录实际上可能是一个jar文件，具体取决于加载类的位置。}

_{^*Note that this "directory" may actually be a jar file, depending on where the class was loaded from.}

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