counterservlet.java

JAVA网上书店的程序原代码,希望对大家偶用

package sample;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CounterServlet extends HttpServlet
{
	int threadCounter;
	int startCounter;
	
	public void init(ServletConfig config) throws ServletException
	{
		super.init(config);
		
		 try{
             String c=config.getInitParameter("counter");
             startCounter=Integer.parseInt(c);
      }
      catch(Exception e){
              e.printStackTrace();
      }
	}
	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
						throws ServletException, IOException
	{
		response.setContentType("text/html");
	      PrintWriter out = response.getWriter();
	      synchronized(this)
	      {
	              threadCounter++; // threadCounter increase when a new client thread call the doGet method
	      }
	       
	      //send response to client
	       out.println("The hits for Servlet is: "+threadCounter);
	       out.println (" <p>  startCounter  is: "+startCounter);
	       out.println ("<p> total counter is :"+ (startCounter+threadCounter));
	}
	

	public void doPost(HttpServletRequest request,HttpServletResponse response)
	     	throws IOException, ServletException
	 {
		   doGet(request,response);
	 }
}