效果图
图片.png
项目目录:
图片.png
图片.png
切换浏览器，数据连续累加（全局作用域，服务器不重启，数据会一直保留）
html代码
<h3>hello world!</h3>
<a href="WebCount">click1</a>
CountServlet代码
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setHeader("Content-Type ","text/html;charset=UTF-8");
response.setContentType("text/html;charset=UTF-8");
response.getWriter().append("Served at: ").append(request.getContextPath());
PrintWriter out= response.getWriter();
out.print("hello world!");
ServletContext context =this.getServletContext();
Integer count=(Integer) context.getAttribute("counter");
if(count==null) {
count=1;
context.setAttribute("counter", count+1);
}
request.getServletContext().setAttribute("counter",count+1);
response.getWriter().println("网站访问量为："+count);
/* response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
out.println("<!DOCTYPE html>" +
"<html>");
out.println("<HEAD><TITLE>count times</TITLE></HEAD>");
out.println("<BODY>");
out.println("<h3><font color='skyblue'>");
out.println("you are num:"+context.getAttribute("counter"));
out.println("</font><h2>");
out.println("</BODY>");
out.println("</HTML>");*/
out.flush();
out.close();
/*int totalCount=1;
//默认访问量为1
Object count = request.getServletContext().getAttribute("Faker");
//判断count是否为null，不为null表示曾经访问过，直接将count赋值给totalCount
if(count!=null) {
totalCount=(int)count;
}
//访问次数累加
request.getServletContext().setAttribute("Faker",totalCount+1);
response.getWriter().println("网站访问量为："+totalCount);
//输出到界面
*/
}
参考:https://blog.csdn.net/qq_42813491/article/details/87807132
