SearchSpec searchSpec = commonSpecs[i];

      if (searchSpec.getName().equals(searchEngine)) {

        String url =

          searchSpec.makeURL(searchString, numResults);

        response.sendRedirect(url);

        return;

      }

    }

    reportProblem(response, "Unrecognized search engine.");

  }

  private void reportProblem(HttpServletResponse response,

                             String message)

      throws IOException {

    response.sendError(response.SC_NOT_FOUND,

                       "
" + message + "
");

  }

  public void doPost(HttpServletRequest request,

                     HttpServletResponse response)

      throws ServletException, IOException {

    doGet(request, response);

  }

}

Listing 8.6 SearchEnginesFrontEnd.java 

package coreservlets;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

import java.net.*;

/** Dynamically generated variation of the

 *  SearchEngines.html front end that uses cookies

 *  to remember a user s preferences.

 */

Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.

Servlet and JSP training courses by book's author: courses.coreservlets.com.