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20230403
Commit faadefc3 by Patryk Czarnik
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products6 - filtrowanie wg cen

parent 3d6c796d
Showing with 79 additions and 4 deletions
PC25-SklepWeb/src/main/java/sklep/web/ProductBean.java
package sklep.web; package sklep.web;
import java.math.BigDecimal;
import java.util.List; import java.util.List;
import sklep.db.DBConnection; import sklep.db.DBConnection;
...@@ -8,14 +9,46 @@ import sklep.db.ProductDAO; ...@@ -8,14 +9,46 @@ import sklep.db.ProductDAO;
import sklep.model.Product; import sklep.model.Product;
public class ProductBean { public class ProductBean {
private BigDecimal minPrice, maxPrice;
public List<Product> getAllProducts() { // Chociaż wewnętrznie zmienna jest typu BigDecimal, to gettery i settery napiszemy tak, jakby to były Stringi.
// Robimy to po to, aby w JSP zadziałało setProperty.
public String getMinPrice() {
return minPrice == null ? null : minPrice.toString();
}
public void setMinPrice(String minPrice) {
if(minPrice == null || minPrice.isEmpty()) {
this.minPrice = null;
} else {
this.minPrice = new BigDecimal(minPrice);
}
}
public String getMaxPrice() {
return maxPrice == null ? null : maxPrice.toString();
}
public void setMaxPrice(String maxPrice) {
if(maxPrice == null || maxPrice.isEmpty()) {
this.maxPrice = null;
} else {
this.maxPrice = new BigDecimal(maxPrice);
}
}
// Metoda odczytuje produkty zgodnie z ustawionymi wcześniej kryteriami (w tym przykładzie są to ceny, ale może być więcej filtrów).
public List<Product> getFilteredProducts() throws DBException {
try(DBConnection db = DBConnection.open()) {
return db.productDAO().findByPrice(minPrice, maxPrice);
}
}
// Metoda wygląda jak getter, ale wewnętrznie czyta dane z bazy, a nie z własnej zmiennej.
public List<Product> getAllProducts() throws DBException {
try(DBConnection db = DBConnection.open()) { try(DBConnection db = DBConnection.open()) {
ProductDAO productDAO = db.productDAO(); ProductDAO productDAO = db.productDAO();
return productDAO.readAll(); return productDAO.readAll();
} catch (DBException e) {
e.printStackTrace();
return List.of();
} }
} }
......
PC25-SklepWeb/src/main/webapp/products6.jsp 0 → 100644
<%@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>
<head>
<meta charset="UTF-8">
<title>Lista produktów 6</title>
<link rel="stylesheet" type="text/css" href="styl.css">
</head>
<body>
<h1>Lista produktów - wersja 6 JSP z filtrem</h1>
<jsp:useBean id="productBean" class="sklep.web.ProductBean"/>
<form id="wyszukiwarka" method="get">
<h2>Filtr cen</h2>
<table class="formularz">
<tr><td><label for="min_price">Cena minimalna:</label></td>
<td><input type="number" name="min_price" value="${param.min_price}"></td></tr>
<tr><td><label for="max_price">Cena maksymalna:</label></td>
<td><input type="number" name="max_price" value="${param.max_price}"></td></tr>
<tr><td><button>Szukaj</button></td></tr>
</table>
</form>
<jsp:setProperty name="productBean" property="minPrice" param="min_price"/>
<jsp:setProperty name="productBean" property="maxPrice" param="max_price"/>
<c:forEach var="p" items="${productBean.filteredProducts}">
<div class="product">
<h3>${p.productName}</h3>
<div class="price">Cena: ${p.price}</div>
<div class="price">VAT ${p.vat * 100}%</div>
<c:if test="${not empty p.description}">
<p>${p.description}</p>
</c:if>
</div>
</c:forEach>
</body>
</html>
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