package servletcontext;

import java.io.IOException;
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 ServletA extends HttpServlet {

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
ServletContext sc=this.getServletContext();
//通过域属性名获取域属性值count
Integer count=(Integer)sc.getAttribute("time");
//判断，这个值是不是为null，如果不是就加1；如果是，说明第一次被访问，就为1

if(count==null){
sc.setAttribute("time",1);

}else{
sc.setAttribute("time", count+1);

}
//像浏览器打印需要用到打印流,响应体resp提供了这个方法
PrintWriter pw=resp.getWriter();
pw.print(count);
}
}