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Web17 -- use of El and JSTL

2022-04-23 12:33:00 【Luoluo hushengwei】

hello, Hello everyone , I'm here again , What I want to share with you today is EL And JSTL Use ：

Today's content is based on the knowledge of last time

Catalog

1.index.jsp main interface

2.doIndex.jsp

3. Shopping cart optimization interface （Car.jsp）

1.index.jsp main interface 

<%@page import="com.zking.pojo.Goods"%>
<%@page import="com.zking.biz.impl.GoodsBizImpl"%>
<%@page import="com.zking.biz.IGoodsBiz"%>
<%@page import="com.zking.pojo.User"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>    
<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/css/bootstrap.css">
    <script src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/jquery-3.5.1.js"></script>
    <script src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/bootstrap.js"></script>
    <style>
        td:nth-child(3)::before{
            content: "$";
        }

    </style>
</head>

<body>


<c:if test="${user==null}">
   <c:redirect url="login.jsp"></c:redirect>
</c:if>

<c:if test="${empty goods}"><c:redirect url="doIndex.jsp"></c:redirect></c:if>
    <div class="jumbotron">
        <div class="container">
            <h1> welcome   Source planet SuperMarket</h1>
            <p> Honourable ${user.uname}</p>
            <p><a href="Car.jsp" class="btn btn-primary"></a></p>
            <p><a href="doExit.jsp" class="btn btn-warning"> sign out </a></p>
        </div>
    </div>
    <table class="table">
        <tr>
            <th> Item number </th>
            <th> Name of commodity </th>
            <th> item pricing </th>
            <th> Commodity Description </th>
       
            <th> operation </th>
        </tr>
      
        <c:forEach items="${goods}" var="g"> 
        
        <tr>
            <td>${g.id}</td>
            <td>${g.name}</td>
            <td>${g.price}</td>
            <td>${g.info}</td>
            <td>
                <div class="btn-group btn-group-xs">
                    <button class="btn btn-primary"><span class="glyphicon glyphicon-tags"></span></button>
                          <%-- Link here need to take id In the past  --%>
                    <a href="doAddCar.jsp?id=${g.id}" class="btn btn-primary"> Add cart </a> 
                </div>
            </td>
        </tr>
        </c:forEach>
    </table>
    <div style="text-align:center">
   <ul class="pagination" style="">
   <li>
     <a href="doIndex.jsp?ipage=${Math.max(i-1,1)}">
     <span aria-hidden="true">&laquo;</span>
     </a>
   </li>
   <c:forEach begin="1" end="${maxPage}"  var="i">
   <li class="${ipage==i?"active":""}"><a href="doIndex.jsp?ipage=${i}">${i}</a></li>
   </c:forEach>
   <li><a href="doIndex.jsp?ipage=${i+1==maxPage?maxPage:i+1}" aria-label="Next"><span aria-hidden="true">&raquo;</span></a></li>
   </ul>  
 </div>
</body></html>

2.doIndex.jsp

<%@page import="com.zking.pojo.Goods"%>
<%@page import="java.util.List"%>
<%@page import="com.zking.biz.impl.GoodsBizImpl"%>
<%@page import="com.zking.biz.IGoodsBiz"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%

String parameter=request.getParameter("ipage");
int ipage=1;// Default first page 
if(parameter!=null){
	ipage=Integer.parseInt(parameter);
}

// Get goods biz
IGoodsBiz goodsBiz=new GoodsBizImpl();
// Find out the goods , And put it in the request domain 
session.setAttribute("goods",goodsBiz.getAll(ipage));

// Calculate the number of pages   Bring to index.jsp
int row=goodsBiz.getRowCount();
session.setAttribute("maxPage",(int)Math.ceil(row*1.0/2) );
session.setAttribute("ipage",ipage);

// Hope to carry the data index.jsp in 
response.sendRedirect("index.jsp"); 

%>

3. Shopping cart optimization interface （Car.jsp）

<%@page import="com.zking.pojo.User"%>
<%@page import="com.zking.vo.CarItem"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>    
<!DOCTYPE html>
<html lang="zh">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/css/bootstrap.css">
    <script src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/jquery-3.5.1.js"></script>
    <script src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/bootstrap.js"></script>
    <style>
        td:nth-child(4)::before,
        small {
            content: "$";
        }

        * {
            outline: none !important;
        }

        td,
        th {
            text-align: center;
        }

        input {
            text-align: center;
        }
    </style>
</head>
<%
  Object obj=session.getAttribute("user");
  if(obj==null){
	  response.sendRedirect("login.jsp");
	  return;
  }

%>

<body>
    <div class="jumbotron">
        <div class="container">
            <h1> Welcome to Yuanxing shopping cart </h1>
            <p> Honourable ${user.uname}</p>
            <p><a href="doExit.jsp" class="btn btn-warning"> sign out </a></p>
        </div>
    </div>

    <table class="table">
        <tr>
            <th> Product id </th>
            <th> Name of commodity </th>
            <th> Number of goods </th>
            <th> Commodity price </th>
            <th> operation </th>
        </tr>
       
        <c:forEach items="${car}" var="c">
        <tr>
            <td style="line-height: 30.5px;">${c.goods.id}</td>
            <td style="line-height: 30.5px;">${c.goods.name}</td>
            <td>
                <div class="input-group" style="width: 120px;margin: auto;">
                    <span class="input-group-btn">
                        <a href="doUpdCar.jsp?id=${c.goods.id}&type=0" class="btn btn-default" type="button">-</a>
                    </span>
                    <input type="number" onblur="location.href='doUpdCar.jsp?id=${c.goods.id}&count='+this.value" value="${c.count}" class="form-control">
                    <span class="input-group-btn">
                        <a href="doUpdCar.jsp?id=${c.goods.id}&type=1" class="btn btn-default" type="button">+</a>
                    </span>
                </div>
            </td>
            <td style="line-height: 30.5px;">${c.sum}</td>
            <td style="line-height: 30.5px;">
                <a href="doDelCar.jsp?id=${c.goods.id}" class="btn btn-primary"> Delete </a>
            </td>
        </tr>

        </c:forEach>
    </table>

    <h1 class="alert alert-info">
         The total price of the current shopping cart 
        <small></small>
        <a href="doClear.jsp" class="btn btn-danger"> Click me to settle </a>
    </h1>
</body></html>

版权声明
本文为[Luoluo hushengwei]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/04/202204231226294856.html

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