问题描述
我看到 Class.getResource
和 ClassLoader.getSystemResource
用于在Java中查找资源。是否有理由更喜欢彼此?
I saw both Class.getResource
and ClassLoader.getSystemResource
used to locate a resource in Java. Is there any reason to prefer one to another?
推荐答案
有几种方法可以加载资源,每种资源的含义略有不同 -
There are several ways to load resources, each with a slightly different meaning -
ClassLoader :: getSystemResource()
使用系统类加载器。这使用用于启动程序的类路径。如果您在诸如tomcat之类的Web容器中,则不会从WAR文件中获取资源。
ClassLoader::getSystemResource()
uses the system classloader. This uses the classpath that was used to start the program. If you are in a web container such as tomcat, this will NOT pick up resources from your WAR file.
Class< T> #getResource( )
将类的包名称添加到资源名称,然后委托给它的类加载器。如果资源存储在镜像类的包层次结构中,请使用此方法。
Class<T>#getResource()
prepends the package name of the class to the resource name, and then delegates to its classloader. If your resources are stored in a package hierarchy that mirrors your classes, use this method.
ClassLoader#getResource()
委托给其父类加载器。这将最终搜索资源一直到系统类加载器。
ClassLoader#getResource()
delegates to its parent classloader. This will eventually search for the resource all the way upto the system classloader.
如果您感到困惑,只需坚持 ClassLoader#getResource()
If you are confused, just stick to ClassLoader#getResource()
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