通过jsp与el对数据进行查询(引入jstl)

package com.mab.sevelet;import com.mab.dao.EmpDao;import com.mab.dao.impl.EmpDaoImpl;import com.mab.pojo.Emp;import javax.servlet.RequestDispatcher;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.util.List;@WebServlet("/httpServlet.do")public class servlet extends HttpServlet { //做一个对象empDao，去调用方法EmpDaoImpl() EmpDao empDao = new EmpDaoImpl(); @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //对象empDao再调用具体方法findall();返回查询的数据给到findall，以数据队列的形式存储 List list = empDao.findall(); //把数据再发送到session中，页面缓存中 req.setAttribute("emps",list); //当收到的数据时，我们进行跳转到页面index.jsp进行展示 RequestDispatcher requestDispatcher = req.getRequestDispatcher("index.jsp"); //发送响应和请求 requestDispatcher.forward(req,resp); }}