Servlet统计页面访问次数 Servlet实现统计页面访问次数功能
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实现思路:
1.新建一个CallServlet类继承HttpServlet,重写doGet()和doPost()方法;
2.在doPost方法中调用doGet()方法,在doGet()方法中实现统计网站被访问次数的功能,用户每请求一次servlet,使得访问次数times加1;
3.获取ServletContext,通过它的功能记住上一次访问后的次数。
在web.xml中进行路由配置:
<!-- 页面访问次数 --> <servlet> <servlet-name>call</servlet-name> //CallServlet为处理前后端交互的后端类 <servlet-class>CallServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>call</servlet-name> <url-pattern>/call</url-pattern> </servlet-mapping>
CallServlet类:
import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; /** * Created with IntelliJ IDEA * Details about unstoppable_t: * User: Administrator * Date: 2021-04-07 * Time: 14:57 */ //获得网站被访问的次数 public class CallServlet extends HttpServlet { private static final long serialVersionUID = 1L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("text/html;charset=utf-8"); ServletContext context = getServletContext(); Integer times = (Integer) context.getAttribute("times"); if (times == null) { times = new Integer(1); } else { times = new Integer(times.intValue() + 1); } PrintWriter out= resp.getWriter(); out.println("<html><head><title>"); out.println("页面访问统计"); out.println("</title></head><body>"); out.println("当前页面被访问了"); out.println("<font color=red size=20>"+times+"</font>次"); context.setAttribute("times",times); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doGet(req,resp); } }
前端展示结果:
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