通过servletContext来统计网站的访问次数
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 {
}
}
页:
[1]