Reusing content is easy and highly scalable because a resource can be linked to many times, but it can only be downloaded once.
重用内容很容易，具有很高的伸缩性，因为资源可以链接很多次，但是只需要下载一次。
If the class loader tries to find a nonexistent resource, all the JAR files within the application or applet will have to be downloaded.
如果类装载器试图寻找一个不存在的资源，那么在应用程序或者applet中的所有JAR文件都会下载。
Opens a readable stream for the data downloaded from a resource with the specified URI.
为从具有指定URI 的资源下载的数据打开一个可读的流。
Opens a readable stream for the data downloaded from a resource with the specified URI.
为从具有指定URI 的资源下载的数据打开一个可读的流。
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