从 Java 包加载属性文件 [英] Loading a properties file from Java package

问题描述

我需要在 com.al.common.email.templates 中读取隐藏在我的包结构中的属性文件.

I need to read a properties files that's buried in my package structure in com.al.common.email.templates.

我什么都试过了，还是搞不明白.

I've tried everything and I can't figure it out.

最后，我的代码将在 servlet 容器中运行，但我不想依赖容器做任何事情.我编写了 JUnit 测试用例，它需要在两者中都能工作.

In the end, my code will be running in a servlet container, but I don't want to depend on the container for anything. I write JUnit test cases and it needs to work in both.

推荐答案

当从 com.al.common.email.templates 包中的类加载属性时，您可以使用

When loading the Properties from a Class in the package com.al.common.email.templates you can use

Properties prop = new Properties();
InputStream in = getClass().getResourceAsStream("foo.properties");
prop.load(in);
in.close();

(添加所有必要的异常处理).

(Add all the necessary exception handling).

如果你的类不在那个包中，你需要稍微不同地获取 InputStream:

If your class is not in that package, you need to aquire the InputStream slightly differently:

InputStream in = 
 getClass().getResourceAsStream("/com/al/common/email/templates/foo.properties");

getResource()/getResourceAsStream() 中的相对路径(那些没有前导/"的路径)意味着将相对于代表资源的目录搜索资源类所在的包.

Relative paths (those without a leading '/') in getResource()/getResourceAsStream() mean that the resource will be searched relative to the directory which represents the package the class is in.

使用 java.lang.String.class.getResource("foo.txt") 将搜索(不存在的)文件 /java/lang/String/foo.txt在类路径上.

Using java.lang.String.class.getResource("foo.txt") would search for the (inexistent) file /java/lang/String/foo.txt on the classpath.

使用绝对路径(以/"开头的路径)意味着当前包被忽略.

Using an absolute path (one that starts with '/') means that the current package is ignored.

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