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Absolute to relative path (Eclipse, JSP)

Answer 1

+1 A:

Relative disk file system paths are relative to the current working directory which is dependent on how you started the application (in Eclipse it would be the project folder, in Command console it would be the currently opened folder, in Tomcat manager/service it would be the Tomacat/bin folder, etc). You have no control over this from inside the Java code, so forget about it.

In JSP/Servlet you can use ServletContext#getRealPath() to convert a relative web content path (it has its root in the public webcontent, in your case the /WebContent folder) to an absolute disk file system path. So:

String relativeWebPath = "/config/sdb.ttl";
String absoluteDiskPath = getServletContext().getRealPath(relativeWebPath);
Store store = StoreFactory.create(absoluteDiskPath);
// ...

The ServletContext is available in servlets by the inherited getServletContext() method.

BalusC 2010-08-29 20:44:08

I am creating this Store object in a class that is located in src folder. Since this is not JSP/Servlet I cannot use the method getServletContext(). In JSP I instantiate this class and in its constructor Store object is generated. Any other solution?

Aliens 2010-08-29 21:36:19

A JSP file is semantically the [wrong place](http://stackoverflow.com/questions/3177733/howto-avoid-java-code-in-jsp-files) for the job. Regardless, since JSP files are compiled to a servlet, it has access to the `ServletContext` by `getServletContext()` as well. You can also use the implicit variable `application` which refers the same. I.e. `application.getRealPath(relativeWebPath)`. By the way, did you **actually try** it before saying "I cannot use the method"?

BalusC 2010-08-29 22:04:49

Hey. Of course I tried it and it is still not working. I do not know if you understand me. I am not calling getServletContext() in a JSP. I want to call it in .java file in /src but I cannot do that. This .java file is a class. And that class is instantiated in JSP.

Aliens 2010-08-29 22:29:12

I solved the problem. In JSP I get the right path following your advice. I am passing absoluteDiskPath as a parameter to my java class where I then use it to determine the path.Thanks for helping. BTW your article "how to avoid java code in jsp files" is very good.

Aliens 2010-08-29 22:56:03

Oh, you said you were doing this in a JSP? Well, depending on the functional requirement, a `Filter` (request based) or a `HttpSessionListener` (session based) or a `ServletContextListener` (webapp based) is more suitable for the job. Regardless, you're welcome :)

BalusC 2010-08-29 23:00:22

Answer 2

A:

Right/standard/compatible way is to use http://adderpit.com/jdk/j2eedocs/api/javax/servlet/ServletContext.html#getResourceAsStream(java.lang.String)

like

servletContext.getResourceAsStream("config/sdb.ttl");

iimuhin 2010-08-30 19:10:47

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Absolute to relative path (Eclipse, JSP)

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