package bean;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class CounterServlet extends HttpServlet {
public static final String CONTENT_TYPE="text/html;charset=GB2312";
/**
* Constructor of the object.
*/
public CounterServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
ServletContext context=getServletContext();
HttpSession session=request.getSession(true);
Integer count=(Integer)context.getAttribute("count");
Integer count1 = (Integer)session.getAttribute("count1");
if(count==null){
count=new Integer(0);
context.setAttribute("count",new Integer(0));
}
if(count1== null)
{
count1=new Integer(0);
session.setAttribute("count1", new Integer(0));
}
response.setContentType(CONTENT_TYPE);
PrintWriter out=response.getWriter();
out.println("<HTML>");
out.println("<HEAD><TITLE>count click times</TITLE></HEAD>");
out.println("<BODY>");
out.println("<P>Use ServletContext. now click times ："+count+"</P>");
out.println("<P>Use HttpSession. now click times ："+ count1+"</P>");
out.println("</BODY></HTML>");
count=new Integer(count.intValue()+1);
count1 = new Integer(count1.intValue()+1);
context.setAttribute("count",count);
session.setAttribute("count1", count1);
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occure
*/
public void init(ServletConfig config) throws ServletException {
super.init(config);
// Put your code here
}
}