我怎样才能在Java中提供URL的绝对路径

Question

I want to get absolute path of url. For example, http://localhost:8080 will give me tomcat home page available in root directory. How can I get absolute path of tomcat root directory by providing its url http://localhost:8080 in java.

I found similar question but not found satisfactory answer so I am posting problem here.

Answer 1

You could use javax.servlet.ServletContext.getRealPath(java.lang.String) , although there are some cases where it will not work.

From the API documentation :

Gets the real path corresponding to the given virtual path.

For example, if path is equal to /index.html , this method will return the absolute file path on the server's filesystem to which a request of the form http://<host>:<port>/<contextPath>/index.html would be mapped, where <contextPath> corresponds to the context path of this ServletContext.

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.

Resources inside the /META-INF/resources directories of JAR files bundled in the application's /WEB-INF/lib directory must be considered only if the container has unpacked them from their containing JAR file, in which case the path to the unpacked location must be returned.

This method returns null if the servlet container is unable to translate the given virtual path to a real path.

Parameters:
path - the virtual path to be translated to a real path

Returns:
the real path, or null if the translation cannot be performed