JSTL-if

 

 

<%--
  Created by IntelliJ IDEA.
  User: admin
  Date: 2023/6/29
  Time: 16:29
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <%--
        c:if :来完成逻辑判断，替换Java if else
    --%>

  <%--  <c:if test="true">
        <h1>true</h1>
    </c:if>

    <c:if test="false">
        <h1>false</h1>
    </c:if>--%>

    <c:if test="${status == 1}">
        启用
    </c:if>

    <c:if test="${status == 0}">
        禁用
    </c:if>
</body>
</html>
package com.itheima.web;

import com.itheima.pojo.Brand;

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.ArrayList;
import java.util.List;

@WebServlet("/Demo1")
public class ServletDemo1 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1. 准备数据
        List<Brand> brands = new ArrayList<Brand>();
        brands.add(new Brand(1,"三只松鼠","三只松鼠",100,"三只松鼠，好吃不上火",1));
        brands.add(new Brand(2,"优衣库","优衣库",200,"优衣库，服适人生",0));
        brands.add(new Brand(3,"小米","小米科技有限公司",1000,"为发烧而生",1));
        //2. 存储到request域中
        request.setAttribute("brand",brands);
        request.setAttribute("status",1);
        //3. 转发到 el-demo.jsp
//        request.getRequestDispatcher("/el-demo.jsp").forward(request,response);
        request.getRequestDispatcher("/jst-if.jsp").forward(request,response);
    }



    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request,response);
    }

}

 

posted @ 2023-06-29 16:37  Karlshell  阅读(16)  评论(0)    收藏  举报