EL与JSTL的简单使用

首先我们在request域放入一些数据：

package ELServletPack;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/ELServlet")
public class ELServlet extends HttpServlet {
       
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8");
            response.setContentType("text/html; charset=UTF-8");
            
            request.setAttribute("name", "zs");
            System.out.println("访问到了");
            Map<String,String> map  = new HashMap<>();
            map.put("1", "lisi");
            map.put("2", "ww");
            map.put("3", "zl");
            
            request.setAttribute("mapElements", map);
    
            request.getRequestDispatcher("El.jsp").forward(request, response);;
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

新建jsp文件，读取request域中数据

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core"  prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    ----request域---<br/>
        ${requestScope.name }<br/>
    --------Map对象-------<br/>
    ${requestScope.mapElements["1"]}<br/>
    ${requestScope.mapElements["2"]}<br/>
    ${requestScope.mapElements["3"]}<br/>
    
    --JSTL---request <br/>
    <c:out value="${requestScope.name}"/>

</body>
</html>

 

posted @ 2021-03-14 20:20  二五树  阅读(64)  评论(0)  编辑  收藏  举报