How to manage file path when accessing from different directory location?

I have few web pages sitting in different directories and my goal is to have some sort of organized structure so that I can access to js or css files without hardcoding the path.

For instance, the directory structure is:

root --- js --- some.js
      |
      |--css --- some.css
      |
      |---pages ---- main.jsp
      |
      |---other----foo---- foo.jsp
                 |
                 |--bar --- bar.jsp  

Then main.jsp and foo.jsp tries to reference some.js but has to have different path.

( main.jsp )

<script type="text/javascript" src="../js/some.js"></script>

( foo.jsp)

<script type="text/javascript" src=开发者_Go百科"../../js/some.js"></script>

This is not ideal if I want to change the location of main.jsp or foo.jsp, I have to come back to each files and change the path manually.

I am thinking to have factory class that has full path for each files so that it would look something like:

<script type="text/javascript" src=<% Factory.getFullPath(some.js) %> ></script>

In this case, I can still move files freely and not have to come back to each file.

Can I get some opinion to my approach? Is there other way to solve this?

Use a context-relative path. It will make the path absolute to the domain root. You can obtain the context path by HttpServletRequest#getContextPath(). In JSP, the HttpServletRequest is available by ${pageContext.request}.

<script type="text/javascript" src="${pageContext.request.contextPath}/js/some.js"></script>

(the contextPath itself already starts with a /, so you don't need to prefix it yourself)

You can also set it using the HTML <base> tag so that every relative URL in the page becomes relative to it. This way you don't need to copy ${pageContext.request.contextPath} over all the place.

<base href="${pageContext.request.contextPath}"></base>
<script type="text/javascript" src="js/some.js"></script>

This has however one caveat: anchors, like <a href="#foo"> will also become relative to it. You need to take this into account as well if you go for this.

See also:

• Is is recommended to use <base> tag in HTML?

mm i'm not really sure if a factory is the most appropriate way to do this, maybe it will work.. i remember that for that i used an interface where i implemented some constants including the JS and CSS folder path

public interface Configuration {
   public static final String SERVER_URL = "http://localhost:8080/";
   public static final String CSS_URL = SERVER_URL + "css/";
   public static final String JS_URL = SERVER_URL + "js/";
}

and then i'd have to import this interface in the servlet and call it like this:

...src="<% Configuration.JS_URL %>some.js" />..

that way if you change your folders name or path. you'll only have to change the configuration