clientaccesscounts.java

来自「servletjsp一些应用程序」· Java 代码 · 共 48 行

JAVA
48 行
字号 
package coreservlets;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/** Servlet that prints per-client access counts.
 *  <P>
 *  Taken from Core Servlets and JavaServer Pages 2nd Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  http://www.coreservlets.com/.
 *  &copy; 2003 Marty Hall; may be freely used or adapted.
 */

public class ClientAccessCounts extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    String countString =
      CookieUtilities.getCookieValue(request,
                                     "accessCount",
                                     "1");
    int count = 1;
    try {
      count = Integer.parseInt(countString);
    } catch(NumberFormatException nfe) { }
    LongLivedCookie c =
      new LongLivedCookie("accessCount",
                          String.valueOf(count+1));
    response.addCookie(c);
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    String title = "Access Count Servlet";
    String docType =
      "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +
      "Transitional//EN\">\n";
    out.println(docType +
                "<HTML>\n" +
                "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" +
                "<BODY BGCOLOR=\"#FDF5E6\">\n" +
                "<CENTER>\n" +
                "<H1>" + title + "</H1>\n" +
                "<H2>This is visit number " +
                count + " by this browser.</H2>\n" +
                "</CENTER></BODY></HTML>");
  }
}

clientaccesscounts.java - 源码说明

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