重点
】1.获取项目真实路径
获取当前项目在服务器发布的真实路径
String realpath=servletContext.getRealPath("/");
2.获取项目上下文路径
获取当前项目上下文路径(应用程序名称)
System.out.println(servletContext.getContextPath());//上下文路径(应用程序名称)
System.out.println(request.getContextPath());
3.全局容器
ServletContext拥有作用域,可以存储数据到全局容器中
ServletContext统计当前项目访问次数
package com.qf.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class Servlet3
*/
@WebServlet("/servlet3")
public class Servlet3 extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
ServletContext application = request.getServletContext();
Integer count=(Integer) application.getAttribute("count");
if(count==null) {
count=1;
application.setAttribute("count", count);
}else {
count++;
application.setAttribute("count", count);
}
PrintWriter out=response.getWriter();
out.write("servlet共访问次数:"+count);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
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如有侵权,请联系 cloudcommunity@tencent.com 删除。