如何使用Java ClassLoader从类路径加载文件？ [英] How do I use the Java ClassLoader to load a file fromthe classpath?

问题描述

我想使用ClassLoader加载Properties类的属性文件。为了便于讨论，我简化了以下代码以删除错误处理：

I want to use the ClassLoader to load a properties file for the Properties class. I've simplified the below code to remove error handling for the purposes of this discussion:

loader = this.getClass().getClassLoader();
in = loader.getResourceAsStream("theta.properties");
result = new Properties();
result.load(in);

在与此类相同的目录中，我有文件theta.properties但是InputStream总是空值。我把文件放在错误的地方吗？我正在使用eclipse及其设置将类文件构建到源文件夹 - 所以这应该不是问题。

In the same directory as this class I have the file "theta.properties" but the InputStream is always null. Am I putting the file in the wrong place? I'm using eclipse and its set to build the class files to the source folder - so that shouldn't be the problem.

我在JavaDoc中找不到任何东西让ClassLoader告诉我正在搜索什么类路径。

I can't find anything in the JavaDoc to get the ClassLoader to tell me what classpath is being searched.

推荐答案

使用 getClass（）。getClassloader（）你寻找来自根路径目录的theta.properties。只需使用 getClass（）。getResourceAsStream（）获取相对于该类的资源。

By using getClass().getClassloader() you look for "theta.properties" from the root path directory. Just use getClass().getResourceAsStream() to get a resource relative to that class.

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