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378

Chapter 15 Integrating Servlets and JSP

Listing 15.10 ShowPage.java 

package coreservlets;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

/** Example of the include method of RequestDispatcher.

 *  Given a URI on the same system as this servlet, the

 *  servlet shows you its raw HTML output. 

 */

public class ShowPage extends HttpServlet {

  public void doGet(HttpServletRequest request,

                    HttpServletResponse response)

      throws ServletException, IOException {

    response.setContentType("text/html");

    PrintWriter out = response.getWriter();

    String url = request.getParameter("url");

    out.println(ServletUtilities.headWithTitle(url) +

                "\n" +

                "
" + url + "
\n" +

                "
\n" +

                "");</font></pre></span>
<span name = "INTRA" style='top:719px; left:279px' class="ft2"><pre><font face='Arial'>    if ((url == null) || (url.length() == 0)) {</font></pre></span>
<span name = "INTRA" style='top:736px; left:279px' class="ft2"><pre><font face='Arial'>      out.println("No URL specified.");</font></pre></span>
<span name = "INTRA" style='top:754px; left:279px' class="ft2"><pre><font face='Arial'>    } else {</font></pre></span>
<span name = "INTRA" style='top:771px; left:279px' class="ft2"><pre><font face='Arial'>      // Attaching data works only in version 2.2.</font></pre></span>
<span name = "INTRA" style='top:789px; left:279px' class="ft2"><pre><font face='Arial'>      String data = request.getParameter("data");</font></pre></span>
<span name = "INTRA" style='top:806px; left:279px' class="ft2"><pre><font face='Arial'>      if ((data != null) && (data.length() > 0)) {</font></pre></span>
<span name = "INTRA" style='top:824px; left:279px' class="ft2"><pre><font face='Arial'>        url = url + "?" + data;</font></pre></span>
<span name = "INTRA" style='top:841px; left:279px' class="ft2"><pre><font face='Arial'>      }</font></pre></span>
<span name = "INTRA" style='top:858px; left:279px' class="ft2"><pre><font face='Arial'>      RequestDispatcher dispatcher =</font></pre></span>
<span name = "INTRA" style='top:876px; left:279px' class="ft2"><pre><font face='Arial'>        getServletContext().getRequestDispatcher(url);</font></pre></span>
<span name = "INTRA" style='top:893px; left:279px' class="ft2"><pre><font face='Arial'>      dispatcher.include(request, response);</font></pre></span>
<span name = "INTRA" style='top:911px; left:279px' class="ft2"><pre><font face='Arial'>    }</font></pre></span>
<span name = "INTRA" style='top:928px; left:279px' class="ft2"><pre><font face='Arial'>    out.println("\n" +

                "\n" +

                "");

  }

  /** Handle GET and POST identically. */

  public void doPost(HttpServletRequest request,

                     HttpServletResponse response)

      throws ServletException, IOException {

    doGet(request, response);

  }

}

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

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