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javab_20230928
Commit 12b0f806 by Patryk Czarnik
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Wyświetlanie zdjęć

parent 8117d58d
Showing with 143 additions and 0 deletions
PC25-SklepWeb/src/main/java/sklep/web/Photo.java 0 → 100644
package sklep.web;
import java.io.IOException;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletOutputStream;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.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/web/PhotoUtil.java 0 → 100644
package sklep.web;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
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);
}
}
public static void writeStream(int productId, InputStream inputStream) {
try {
Path path = getPath(productId);
Files.copy(inputStream, path, StandardCopyOption.REPLACE_EXISTING);
} catch (Exception e) {
// wypisujemy błąd, ale metoda kończy się normalnie
e.printStackTrace();
}
}
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/webapp/products7.jsp 0 → 100644
<%@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 7</title>
<link rel="stylesheet" type="text/css" href="styl.css">
</head>
<body>
<h1>Lista produktów - wersja 7</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="${productBean.filteredProducts}">
<div class="product">
<img class="photo" src="photo?productId=${product.productId}" alt=""/>
<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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