Java getResourceAsStream(file) 在哪里搜索文件？
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Where does getResourceAsStream(file) search for the file?
提问by qweruiop
I've got confused by getResourceAsStream();
我被搞糊涂了getResourceAsStream()；
My package structure looks like:
我的包结构如下所示：
\src
|__ net.floodlightcontroller // invoked getResourceAsStream() here
|__ ...
|__ resources
|__ floodlightdefault.properties //target
|__ ...
And I want to read from floodlightdefault.properties. Here is my code, lying in the net.floodlightcontrollerpackage:
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");
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?
但它失败了，得到is == null. 所以我想知道如何getResourceAsStream(file)搜索file. 我的意思是它是通过某些PATHs 还是按特定顺序工作？
If so, how to config the places that getResourceAsStream()looks for?
如果是这样，如何配置getResourceAsStream()寻找的地方？
Thx!
谢谢！
采纳答案by Nathaniel Jones
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:
当您调用 时this.getClass().getClassLoader().getResourceAsStream(File)，Java 在与 指示的类相同的目录中查找文件this。所以如果你的文件结构是：
\src
|__ net.floodlightcontroller.core.module
|__ Foo.java
|__ ...
|__ resources
|__ floodlightdefault.properties //target
|__ ...
Then you'll want to call:
然后你会想打电话：
InputStream is = Foo.class.getClassLoader()
.getResourceAsStream("..\..\..\resources\floodlightdefault.properties");
Better yet, change your package structure to look like:
更好的是，将您的包结构更改为：
\src
|__ net.floodlightcontroller.core.module
|__ Foo.java
|__ floodlightdefault.properties //target
|__ ...
And just call:
只需调用：
InputStream is = Foo.class.getClassLoader()
.getResourceAsStream("floodlightdefault.properties");
