/ WEB-INF 文件夹是不是类路径的一部分。所以这里的任何答案都没有意义，建议 ClassLoader＃getResourceAsStream（） 将从不工作。它只有在属性文件放在 / WEB-INF / classes 中才有效，这确实是类路径的一部分（在像Eclipse这样的IDE中，只是放在Java源代码中）文件夹root应该足够了。

The /WEB-INF folder is not part of the classpath. So any answer here which is thoughtless suggesting ClassLoader#getResourceAsStream() will never work. It would only work if the properties file is placed in /WEB-INF/classes which is indeed part of the classpath (in an IDE like Eclipse, just placing it in Java source folder root ought to be sufficient).

如果属性文件确实存在于你想保留它的位置，那么你应该把它作为web内容资源通过 ServletContext＃getResourceAsStream（） 代替。

Provided that the properties file is really there where you'd like to keep it, then you should be getting it as web content resource by ServletContext#getResourceAsStream() instead.

假设你在 HttpServlet里面，这应该做：

properties.load(getServletContext().getResourceAsStream("/WEB-INF/properties/sample.properties"));

（ getServletContext（）继承自servlet超类，你不需要自己实现它;所以代码是原样的）

(the getServletContext() is inherited from the servlet superclass, you don't need to implement it yourself; so the code is as-is)

但是如果类是本身不是 HttpServlet ，那么你真的需要将属性文件移动到类路径中。

But if the class is by itself not a HttpServlet at all, then you'd really need to move the properties file into the classpath.

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