Added StorageService.java and some utils for it.

src/main/java/site/easystartup/easystartupcore/config/AppConfig.java

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+package site.easystartup.easystartupcore.config;
+
+public class AppConfig {
+}

src/main/java/site/easystartup/easystartupcore/config/FileConfig.java

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+package site.easystartup.easystartupcore.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Scope;
+import site.easystartup.easystartupcore.storage.FileLocalStorageService;
+import site.easystartup.easystartupcore.storage.StorageService;
+
+@Configuration
+public class FileConfig {
+    @Bean
+    @Scope("singleton")
+    public StorageService storageService() {
+        return new FileLocalStorageService();
+    }
+}

src/main/java/site/easystartup/easystartupcore/storage/FileLocalStorageService.java

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+package site.easystartup.easystartupcore.storage;
+
+import lombok.SneakyThrows;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.UrlResource;
+import org.springframework.util.FileSystemUtils;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.stream.Stream;
+
+public class FileLocalStorageService implements StorageService {
+    private final Path root = Paths.get("uploads");
+
+    public FileLocalStorageService() {
+        init();
+    }
+
+    @Override
+    public void init() {
+        try {
+            if(!root.toFile().exists())
+                Files.createDirectory(root);
+        } catch (IOException e) {
+            throw new RuntimeException("Could not initialize folder for upload!");
+        }
+    }
+    @Override
+    public void save(MultipartFile file) {
+        try {
+            Files.copy(file.getInputStream(), this.root.resolve(file.getOriginalFilename()));
+        } catch (Exception e) {
+            System.out.println("Could not store the file. Error: " + e.getMessage());
+        }
+    }
+
+    @SneakyThrows
+    @Override
+    public void saveImage(MultipartFile file, String name) {
+        try {
+            Files.copy(file.getInputStream(), this.root.resolve(name + ".jpg"));
+        } catch (Exception e) {
+            Files.delete(this.root.resolve(name + ".jpg"));
+            Files.copy(file.getInputStream(), this.root.resolve(name + ".jpg"));
+        }
+    }
+
+    @Override
+    public Resource load(String filename) {
+        try {
+            Path file = root.resolve(filename);
+            Resource resource = new UrlResource(file.toUri());
+            if (resource.exists() || resource.isReadable()) {
+                return resource;
+            } else {
+                throw new RuntimeException("Could not read the file!");
+            }
+        } catch (MalformedURLException e) {
+            throw new RuntimeException("Error: " + e.getMessage());
+        }
+    }
+    @Override
+    public void deleteAll() {
+        FileSystemUtils.deleteRecursively(root.toFile());
+    }
+
+    @Override
+    public Stream<Path> loadAll() {
+        try {
+            return Files.walk(this.root, 1).filter(path -> !path.equals(this.root)).map(this.root::relativize);
+        } catch (IOException e) {
+            throw new RuntimeException("Could not load the files!");
+        }
+    }
+}

src/main/java/site/easystartup/easystartupcore/storage/StorageFileNotFoundException.java

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+package site.easystartup.easystartupcore.storage;
+
+public class StorageFileNotFoundException extends RuntimeException {
+    public StorageFileNotFoundException(String filename) {
+        super("Could not find file with name " + filename);
+    }
+}

src/main/java/site/easystartup/easystartupcore/storage/StorageService.java

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+package site.easystartup.easystartupcore.storage;
+
+import org.springframework.core.io.Resource;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.nio.file.Path;
+import java.util.stream.Stream;
+
+public interface StorageService {
+    void init();
+    void save(MultipartFile file);
+    void saveImage(MultipartFile file, String name);
+    Resource load(String filename);
+    void deleteAll();
+    Stream<Path> loadAll();
+}