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java_weekendowa_20221008
Commit 8c7f661e by Patryk Czarnik
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obsługa zdjęć

parent 2cab91f8
Showing with 145 additions and 1 deletions
PC25-SklepWeb/src/main/java/sklep/photo/Photo.java 0 → 100644
package sklep.photo;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import sklep.db.RecordNotFound;
@WebServlet("/Photo")
public class Photo extends HttpServlet {
private static final long serialVersionUID = 1L;
/* Ten serwlet wczytuje z dysku plik ze zdjęciem o podanym numerze (z parametru productId).
* Aby odesłać odpowiedź "binarną" (a nie tekstową) używamy getOutputStream() zamiast getWriter().
* Aby przeglądarka wiedziała, że otrzymuje grafikę, ustawiamy content-type image/jpeg.
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String parametrId = request.getParameter("productId");
if(parametrId == null) {
return;
}
try {
int id = Integer.parseInt(parametrId);
byte[] bytes = PhotoUtil.readBytes(id);
response.setContentType("image/jpeg");
ServletOutputStream output = response.getOutputStream();
output.write(bytes);
output.close();
} catch (RecordNotFound e) {
response.setStatus(404);
response.setContentType("text/plain");
response.setCharacterEncoding("utf-8");
response.getWriter().println("Nie ma zdjęcia dla produktu o nr " + parametrId);
} catch (Exception e) {
response.setStatus(500);
e.printStackTrace();
}
}
}
PC25-SklepWeb/src/main/java/sklep/photo/PhotoUtil.java 0 → 100644
package sklep.photo;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import sklep.db.DBException;
import sklep.db.DBSettings;
import sklep.db.RecordNotFound;
public class PhotoUtil {
private static final String EXT = ".jpg";
public static File getFile(int productId) throws DBException, RecordNotFound {
Path path = getPath(productId);
File file = path.toFile();
if(file.exists()) {
return file;
} else {
throw new RecordNotFound("Cannot read photo for product id = " + productId);
}
}
public static byte[] readBytes(int productId) throws DBException, RecordNotFound {
Path path = getPath(productId);
try {
return Files.readAllBytes(path);
} catch (IOException e) {
// System.err.println(e);
throw new RecordNotFound("Cannot read photo for product id = " + productId);
}
}
private static Path getPath(int productId) throws DBException {
String dir = DBSettings.load().getProperty("photo_dir");
String fileName = productId + EXT;
return Paths.get(dir, fileName);
}
}
PC25-SklepWeb/src/main/resources/sklep.properties
...@@ -2,5 +2,8 @@ url=jdbc:postgresql://localhost:5432/sklep ...@@ -2,5 +2,8 @@ url=jdbc:postgresql://localhost:5432/sklep
driver_class=org.postgresql.Driver driver_class=org.postgresql.Driver
user=kurs user=kurs
password=abc123 password=abc123
photo_dir=/home/patryk/sklep/foto
# To jest komentarz # Sciezki na Windows: albo piszemy slashe / , albo podwojne backslashe \\
# photo_dir=C:/Users/Patryk/Desktop/sklep/foto
# photo_dir=C:\\Users\\Patryk\\Desktop\\sklep\\foto
PC25-SklepWeb/src/main/webapp/products7.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 7</title>
<link rel="stylesheet" type="text/css" href="styl.css">
</head>
<body>
<h1>Lista produktów - wersja 7</h1>
<jsp:useBean id="bean" 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>
<div>Produkty o cenach
<c:if test="${not empty(param.min_price)}">
od ${param.min_price}
</c:if>
<c:if test="${not empty(param.max_price)}">
do ${param.max_price}
</c:if>
</div>
<jsp:setProperty name="bean" property="minPrice" param="min_price"/>
<jsp:setProperty name="bean" property="maxPrice" param="max_price"/>
<c:forEach var="p" items="${bean.filteredProducts}">
<div class="product">
<img class="photo" src="Photo?productId=${p.productId}" alt=""/>
<h3>${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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