PhotoUtil i wyświetlanie zdjęć

PC37-SklepSpring/src/main/java/sklep/photo/PhotoController.java

+package sklep.photo;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+@Controller
+public class PhotoController {
+    @Autowired
+    private PhotoUtil photoUtil;
+
+    @GetMapping(path="/products/{id}/photo", produces="image/jpeg")
+    @ResponseBody
+    public byte[] getPhoto(@PathVariable int id) {
+        return photoUtil.readBytes(id);
+    }
+}

PC37-SklepSpring/src/main/java/sklep/photo/PhotoUtil.java

+package sklep.photo;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpStatusCode;
+import org.springframework.stereotype.Component;
+import org.springframework.web.server.ResponseStatusException;
+
+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;
+
+@Component
+public class PhotoUtil {
+    private static final String EXT = ".jpg";
+
+    @Value("${alx.photo_dir}")
+    private String dir;
+
+    public File getFile(int productId) {
+        Path path = getPath(productId);
+        File file = path.toFile();
+        if(file.exists()) {
+            return file;
+        } else {
+            throw new ResponseStatusException(HttpStatusCode.valueOf(404), "Brak zdjęcia nr " + productId);
+        }
+    }
+
+    public byte[] readBytes(int productId) {
+        Path path = getPath(productId);
+        try {
+            return Files.readAllBytes(path);
+        } catch (IOException e) {
+            throw new ResponseStatusException(HttpStatusCode.valueOf(404), "Brak zdjęcia nr " + productId);
+        }
+    }
+
+    public 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 Path getPath(int productId) {
+        String fileName = productId + EXT;
+        return Paths.get(dir, fileName);
+    }
+
+    public void writeBytes(int productId, byte[] bytes) {
+        try {
+            Path path = getPath(productId);
+            Files.write(path, bytes);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}

PC37-SklepSpring/src/main/resources/application.properties

@@ -5,3 +5,5 @@ spring.mvc.view.suffix=.jsp
 spring.datasource.url=jdbc:postgresql://localhost/sklep
 spring.datasource.username=alx
 spring.datasource.password=abc123
+
+alx.photo_dir=/home/patryk/sklep/foto