getResourceAsStream（file）在哪里搜索文件？ [英] Where does getResourceAsStream(file) search for the file?

问题描述

我对 getResourceAsStream（）;

感到困惑我的包结构如下：

My package structure looks like:

\src
|__ net.floodlightcontroller // invoked getResourceAsStream() here
|__ ...
|__ resources
    |__ floodlightdefault.properties //target
    |__ ...

b $ b

我想从floodlightdefault.properties中读取。这是我的代码，位于 net.floodlightcontroller 包中：

package net.floodlightcontroller.core.module;
// ...
InputStream is = this.getClass().getClassLoader()
                 .getResourceAsStream("floodlightdefault.properties");

但它失败了，得到 is == null 。所以我想知道 getResourceAsStream（file）究竟是如何搜索文件。我的意思是它通过某些 PATH 或在某个订单中工作？

But it failed, getting is == null. So I'm wondering how exactly does getResourceAsStream(file) search for the file. I mean does it work through certain PATHs or in a certain order?

如果是，如何配置 getResourceAsStream（）的地方？

If so, how to config the places that getResourceAsStream() looks for?

Thx！

推荐答案

，Java在与 this 指示的类相同的目录中查找该文件。因此，如果您的文件结构是：

When you call this.getClass().getClassLoader().getResourceAsStream(File), Java looks for the file in the same directory as the class indicated by this. So if your file structure is:

\src
|__ net.floodlightcontroller.core.module
    |__ Foo.java
|__ ...
|__ resources
    |__ floodlightdefault.properties //target
    |__ ...

然后你需要调用：

InputStream is = Foo.class.getClassLoader()
             .getResourceAsStream("..\..\..\resources\floodlightdefault.properties");

更好的是，改变你的包结构看起来像：

Better yet, change your package structure to look like:

\src
|__ net.floodlightcontroller.core.module
    |__ Foo.java
    |__ floodlightdefault.properties //target
    |__ ...

只需拨打电话：

InputStream is = Foo.class.getClassLoader()
             .getResourceAsStream("floodlightdefault.properties");

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