Prentice Hall and Sun Microsystems. Personal use only; do not redistribute.

7.4 Using Persistent HTTP Connections

165

Listing 7.6  PersistentConnection.java 

package coreservlets;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

import java.util.*;

/** Illustrates the value of persistent HTTP connections for

 *  pages that include many images, applet classes, or

 *  other auxiliary content that would otherwise require

 *  a separate connection to retrieve.

 */

public class PersistentConnection extends HttpServlet {

  public void doGet(HttpServletRequest request,

                    HttpServletResponse response)

      throws ServletException, IOException {

    response.setContentType("text/html");

    ByteArrayOutputStream byteStream =

      new ByteArrayOutputStream(7000);

    PrintWriter out = new PrintWriter(byteStream, true);

    String persistenceFlag =

      request.getParameter("usePersistence");

    boolean usePersistence =

      ((persistenceFlag == null) ||

       (!persistenceFlag.equals("no")));

    String title;

    if (usePersistence) {

      title = "Using Persistent Connection";

    } else {

      title = "Not Using Persistent Connection";

    }

    out.println(ServletUtilities.headWithTitle(title) +

                "\n" +

                "
" + title + "
");

    int numImages = 100;

    for(int i=0; i