CODEWITHSUNDEEP
javaweb-serviceshttpservletsweb
Marcus Leon
Marcus Leon

Reputation: 56669

Supporting two URI's with same servlet

Currently we have all links on our site set up as /xxx/UseCase.

We would like to now accept incoming requests with the prefix /yyy such as /yyy/xxx/UseCase. So we would have one servlet that accepts requests on both /yyy/xxx/UseCase and /xxx/UseCase.

How can we do this?

Biggest challenge here being: A number of pages redirect to other URI's using the absolute path. Ie: the Patients servlet redirects to /xxx/Insurance. Issue is if you're at /yyy/xxx/Patients you shouldn't now get redirected to /xxx/Insurance - you should get redirected to /yyy/xxx/Insurance

Upvotes: 0

Views: 1959

Answers (2)

BalusC
BalusC

Reputation: 1108712

You can just map a servlet on more than one URL pattern:

<servlet-mapping>
    <servlet-name>fooServlet</servlet-name>
    <url-pattern>/xxx/*</url-pattern>
    <url-pattern>/yyy/*</url-pattern>
</servlet-mapping>

Or when you're already on Servlet 3.0:

@WebServlet(urlPatterns={"/xxx/*", "/yyy/*"})
public class FooServlet extends HttpServlet {
    // ...
}

You can if necessary use /yyy/xxx/* instead of /yyy/*.

Or if you intend to untouch the servlet mapping, you could also create a Filter which forwards requests on /yyy/xxx/* to /xxx/*. Something like this (basic checks omitted):

@WebFilter("/yyy/xxx/*")
public class FooFilter implements Filter {

    // ...

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest req = (HttpServletRequest) request;
        String oldURI = req.getRequestURI().substring(req.getContextPath().length() + 1);
        String newURI = oldURI.substring(oldURI.indexOf("/"));
        req.getRequestDispatcher(newURI).forward(request, response);
    }

    // ...
}

If you intend to change the URL in the browser address bar from /yyy/xxx/* to /xxx/*, then you need to use HttpServletResponse#sendRedirect() instead of RequestDispatcher#forward():

         // ...
         HttpServletResponse res = (HttpServletResponse) response;
         res.sendRedirect(newURI);

Upvotes: 4

Dave
Dave

Reputation: 6179

I don't think the problem is with your servlet mapping. I think it is with how you're doing your redirects. Try this for your redirect logic...

response.sendRedirect(request.getRequestURI().replace("Patients", "Insurance"));

This way you don't have to mess with if statements as it should work in both situations.

Upvotes: 1

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