java - Getting resource from ExternalContext in Servlet -

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in bean getting url of image this:

externalcontext ec = facescontext.getcurrentinstance().getexternalcontext(); url url = ec.getresource("/myimagedirectory/image.png");

how can in httpservlet?

i tried following, did not work:

servletcontext sc = getservletcontext(); url url = sc.getresource("/myimagedirectory/image.png");

the httpservlet in same application bean.

 getservletcontext().getrealpath("/")+"/myimagedirectory/image.png";

the "/" represents web content root.

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