处理外部文件的getResourceAsStream [英] Dealing with getResourceAsStream for outside file

问题描述

我遇到一个getResourceAsStream方法的问题 - 它返回null因为错误的目录。问题是我没有一个想法如何定义目录。

I'm having a problem with getResourceAsStream method - it returns null because of wrong directory. The problem is that I do not have an idea how to define the dir.

我的项目结构如下

Project
  #src
    #com.package
      #ExampleClass.java
  #dll
    #MyFile.dll

当我有

InputStream in = this.getClass().getResourceAsStream("../dll/" + "MyFile.dll");

它返回null。有谁有一个想法如何处理这个问题，如何定义路径？

It returns null. Do anyone have an idea how to deal with this problem and how the path schould be defined?

推荐答案

如果 在 com.package 包中的 ExampleClass ，你需要去两个级别到达CLASSPATH的根目录：

If this is ExampleClass in com.package package, you need to go two levels up to reach the root of the CLASSPATH:

this.getClass().getResourceAsStream("../../dll/" + "MyFile.dll");

假设 / dll 目录直接放在CLASSPATH的根目录。或者直接使用绝对路径：

Assuming /dll directory is placed directly in the root of your CLASSPATH. Or simply use absolute path:

this.getClass().getResourceAsStream("/dll/" + "MyFile.dll");

如果 /dll/MyFile.dll 不是在你的CLASSPATH（只是打开你的JAR文件并检查它是否存在）你应该使用文件系统机制来打开它。

If the /dll/MyFile.dll is not on yout CLASSPATH (just open your JAR file and check whether it's there) you should use file system mechanisms to open it.

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