Servlet 实现訪问量的统计小案例

今天学习了Servlet的基础知识，学习了一个统计訪问量的小案例，记录一下

package cn.selevet_01;

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

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

public class Servlet extends HttpServlet {

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

	 ServletContext sc = this.getServletContext();
	    Integer ct=(Integer)sc.getAttribute("count");
	    if(ct==null)
	    {
	    	sc.setAttribute("count", 1);
	    }
	    else{
	    	sc.setAttribute("count", ct+1);
	    }
	    System.out.println("訪问量为:"+sc.getAttribute("count"));
	}

}