java网站访问量统计

最新推荐文章于 2024-07-07 03:52:35 发布

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最新推荐文章于 2024-07-07 03:52:35 发布

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分类专栏： JAVA

本文链接：https://blog.youkuaiyun.com/qq_43154448/article/details/103359353

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一个项目中所有的资源被访问都要对访问量进行累加！
创建一个int类型的变量，用来保存访问量，然后把它保存到ServletContext的域中，这样可以保存所有的Servlet都可以访问到！

最初时，ServletContext中没有保存访问量相关的属性；
当本站第一次被访问时，创建一个变量，设置其值为1；保存到ServletContext中；
当以后的访问时，就可以从ServletContext中获取这个变量，然后在其基础之上加１。

package day09_2;

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 AServlet extends HttpServlet {

	/**
		 * The doGet method of the servlet. <br>
		 *
		 * This method is called when a form has its tag value method equals to get.
		 * 
		 * @param request the request send by the client to the server
		 * @param response the response send by the server to the client
		 * @throws ServletException if an error occurred
		 * @throws IOException if an error occurred
		 */
	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the GET method");
		out.println("  </BODY>");
		out.println("</HTML>");
		
		
		//统计访问次数
		//1、获取ServletContext对象
		//2、从ServletContext对象中获取count属性
		//---若存在，则访问量+1，再保存回去
		//---若不存在则说明是第一次访问，向ServletContext中保存count属性，值为1
		ServletContext app=this.getServletContext();
		Integer count=(Integer)app.getAttribute("count");
		if(count==null){
			app.setAttribute("count", 1);
		}else{
			
			app.setAttribute("count", count+1);
		}
		//向浏览器输出，需要使用响应对象
		
		out.print("<h1>"+count+"</h1>");
		out.flush();
		out.close();
	}

	/**
		 * The doPost method of the servlet. <br>
		 *
		 * This method is called when a form has its tag value method equals to post.
		 * 
		 * @param request the request send by the client to the server
		 * @param response the response send by the server to the client
		 * @throws ServletException if an error occurred
		 * @throws IOException if an error occurred
		 */
	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the POST method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

}