📄 counter1servlet.java

📁 这个是学习网络编程的好好文档！里面有一些老师发给的学习jsp的课件！

💻 JAVA

字号:

package com.xl.ch04;

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

public class Counter1Servlet extends HttpServlet
{
  Integer counter1;
  public void init(ServletConfig config) throws ServletException
  {
    super.init(config);
  }
  
  public void doGet(HttpServletRequest req,HttpServletResponse resp) 
         throws IOException
  {
    HttpSession session=req.getSession(true);
    //set the Response Content Type
    resp.setContentType("text/html");
    resp.setCharacterEncoding("GB2312");
    //obtain a PrintWriter stream to write to.
    PrintWriter out=resp.getWriter();   
    //print out our Text
    out.println("<html><head><title>Session Servlet</title></head><body>");
    counter1=(Integer)session.getAttribute("session_counter");
    if(counter1==null)
    {
      counter1=new Integer(1);  
    }
    else
    {
      counter1=new Integer(counter1.intValue()+1);
    } 

    session.setAttribute("session_counter",counter1);   
    out.println("<font size=\"5\">");
    out.println("你已经访问了本页面<b>"+counter1+"</b>次.");
    out.println("<br>点击<a href="+resp.encodeURL("Counter1")+">这里</a>");
    out.println("再一次访问本页面!");
    out.println("<br>session.isNew()="+session.isNew());    

    //Following,demonstrate some of the more common methods in the HttpSession object surrounding sessions:
    out.println("<hr width=\"100%\">");
    out.println("<br>RequestData:");
    out.println("<br>请求的会话ID="+req.getRequestedSessionId());
    out.println("<br>请求的会话ID（来自Cookie）="+req.getRequestedSessionId());
    out.println("<br>请求的会话ID（来自URL）="+req.getRequestedSessionId());
    out.println("<br>有效的会话ID="+req.isRequestedSessionIdValid());
    
    out.println("<hr width=\"100%\">");
    out.println("<br>Session Data:");
    out.println("<br>会话ID:"+session.getId());
    out.println("<br>创建时间："+session.getCreationTime());
    out.println("<br>最后访问时间："+session.getLastAccessedTime());
    out.println("</font></body></html>");
  }
}

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