通过servletContext来统计网站的访问次数

gengen201314 · 发表于 2013-2-7 15:12:57

package cn.com.feng.task1;
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;
/**
* 通过servletContext
* 统计网站的访问次数
* @author Administrator
*
*/
public class CountNum extends HttpServlet {
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
}
/**
* The doGet method of the servlet. <br>
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  response.setContentType("text/html;charset=utf-8");
  //获得servletContext
  ServletContext context = this.getServletContext();

//  context.setAttribute("num", 1);
  Object o1 = context.getAttribute("num");
  int num = 0;
  //判断属性是否已经存在
  if(o1==null){
   //设置属性
   context.setAttribute("num", 1);
  }else {
    num = (Integer)context.getAttribute("num");
    context.setAttribute("num",++num);
  }


//  context.setAttribute("count",context.getAttribute("num"));
  PrintWriter out = response.getWriter();
  out.println("<HTML>");
  out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
  out.println(" <BODY>");
  out.println("访问次数:");
  out.println(context.getAttribute("num"));
  out.println(" </BODY>");
  out.println("</HTML>");
  out.flush();
  out.close();
}
/**
* The doPost method of the servlet. <br>
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  this.doGet(request, response);
}
/**
* Initialization of the servlet. <br>
*/
public void init() throws ServletException {
}
}

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