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Patryk Czarnik
javab_20230928
Commits
891862e9
Commit
891862e9
authored
Oct 18, 2023
by
Patryk Czarnik
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products6 - filtrowanie
parent
17e547fe
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85 additions
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8 deletions
+85
-8
ProductBean.java
PC25-SklepWeb/src/main/java/sklep/web/ProductBean.java
+44
-8
products6.jsp
PC25-SklepWeb/src/main/webapp/products6.jsp
+41
-0
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PC25-SklepWeb/src/main/java/sklep/web/ProductBean.java
View file @
891862e9
package
sklep
.
web
;
import
java.math.BigDecimal
;
import
java.util.List
;
import
sklep.db.DBConnection
;
...
...
@@ -7,14 +8,49 @@ import sklep.db.DBException;
import
sklep.db.ProductDAO
;
import
sklep.model.Product
;
/* Ta klasa jest po to, aby w skrypcie JSP w wygodny sposób odczytać sobie listę produktów z bazy danych. */
public
class
ProductBean
{
public
List
<
Product
>
getAllProducts
()
throws
DBException
{
try
(
DBConnection
db
=
DBConnection
.
open
())
{
ProductDAO
productDAO
=
db
.
productDAO
();
return
productDAO
.
readAll
();
}
}
private
BigDecimal
minPrice
,
maxPrice
;
// 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 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
())
{
ProductDAO
productDAO
=
db
.
productDAO
();
return
productDAO
.
readAll
();
}
}
// 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
);
}
}
}
PC25-SklepWeb/src/main/webapp/products6.jsp
0 → 100644
View file @
891862e9
<
%@
page
language=
"java"
contentType=
"text/html; charset=UTF-8"
pageEncoding=
"UTF-8"
%
>
<
%@
taglib
prefix=
"c"
uri=
"jakarta.tags.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
</h1>
<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>
Filtruj
</button></td></tr>
</table>
</form>
<jsp:useBean
id=
"productBean"
class=
"sklep.web.ProductBean"
/>
<jsp:setProperty
name=
"productBean"
property=
"minPrice"
param=
"min_price"
/>
<jsp:setProperty
name=
"productBean"
property=
"maxPrice"
param=
"max_price"
/>
<c:forEach
var=
"product"
items=
"${productBean.filteredProducts}"
>
<div
class=
"product"
>
<h3>
${product.productName}
</h3>
<div
class=
"price"
>
Cena: ${product.price}
</div>
<div
class=
"price"
>
VAT ${product.vat * 100}%
</div>
<c:if
test=
"${not empty(product.description)}"
>
<p
class=
"description"
>
${product.description}
</p>
</c:if>
</div>
</c:forEach>
</body>
</html>
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