public String getRealPath(String path);
Returns a <code>String</code> containing the real path for a given virtual path.
给一个虚拟路径之后,会返回一个字符串,该字符串包含真实的路径
For example, the path "/index.html" returns the absolute file path on the server's filesystem would be served by a
举个例子,如果传入的path为/index.html 那么将返回服务于请求'http://host/contextPath/index.html'的服务器的文件系统中响应 该请求的文件的绝对文件路径
request for "http://host/contextPath/index.html",
where contextPath is the context path of this ServletContext..
在这里环境路径就是这个ServletContext类的环境路径(也就是在controller中配置的路由)
* The real path returned will be in a form
* appropriate to the computer and operating system on
* which the servlet container is running, including the
* proper path separators.
这个返回的真实路径将会是一种适合于计算机和servlet容器运行的操作系统的形式
包括合适的路径分离器
This method returns <code>null</code>
该方法也会返回null
* if the servlet container cannot translate the virtual path
如果servlet容器不能将虚拟路径翻译成真实路径话(由于某种原因,比如....)
* to a real path for any reason (such as when the content is
* being made available from a <code>.war</code> archive).
*
* 介绍一下参数path
* @param path a <code>String</code> specifying a virtual path(具体就是一个虚拟路径)
*
* 介绍一下返回值
* @return a <code>String</code> specifying the real path,
* or null if the translation cannot be performed
* (具体就是一个真实路径,也可能是null如果翻译不能被执行的话)
*
*