Initial commit.

src/main/java/com/example/demo/DemoApplication.java

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+package com.example.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(DemoApplication.class, args);
+	}
+
+}

src/main/java/com/example/demo/configuration/MultipartResolverConfiguration.java

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+package com.example.demo.configuration;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.multipart.MultipartResolver;
+import org.springframework.web.multipart.commons.CommonsMultipartResolver;
+
+import java.nio.file.Path;
+
+@Configuration
+public class MultipartResolverConfiguration {
+    @Bean
+    public MultipartResolver multipartResolver(@Value("${app.files.uploads.max-size}") int maxSize) {
+        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
+        multipartResolver.setMaxUploadSize(maxSize * 1000 * 1000);
+        return multipartResolver;
+    }
+}

src/main/java/com/example/demo/controller/FileController.java

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+package com.example.demo.controller;
+
+import com.example.demo.payload.UploadFileResponse;
+import com.example.demo.service.FileService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.core.io.Resource;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
+import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
+
+import javax.servlet.http.HttpServletRequest;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+@RestController
+public class FileController {
+    private static final Logger logger = LoggerFactory.getLogger(FileController.class);
+    private FileService service;
+
+    public FileController(FileService service) {
+        this.service = service;
+    }
+
+    @PostMapping("/upload")
+    public UploadFileResponse upload(@RequestParam("file") MultipartFile file) {
+        String fileName = service.store(file);
+
+        String fileDownloadUri = ServletUriComponentsBuilder.fromCurrentContextPath()
+                .path("/downloadFile/")
+                .path(fileName)
+                .toUriString();
+
+        return new UploadFileResponse(fileName, fileDownloadUri, file.getContentType(), file.getSize());
+    }
+
+    @PostMapping("/uploadMultipleFiles")
+    public List<UploadFileResponse> uploadMultipleFiles(@RequestParam("files") MultipartFile[] files) {
+        return Arrays.asList(files)
+                .stream()
+                .map(file -> upload(file))
+                .collect(Collectors.toList());
+    }
+
+    @GetMapping("/downloadFile/{fileName:.+}")
+    public ResponseEntity<Resource> downloadFile(@PathVariable String fileName, HttpServletRequest request) {
+        // Load file as Resource
+        Resource resource = service.loadFileAsResource(fileName);
+
+        // Try to determine file's content type
+        String contentType = null;
+        try {
+            contentType = request.getServletContext().getMimeType(resource.getFile().getAbsolutePath());
+        } catch (IOException ex) {
+            logger.info("Could not determine file type.");
+        }
+
+        // Fallback to the default content type if type could not be determined
+        if(contentType == null) {
+            contentType = "application/octet-stream";
+        }
+
+        return ResponseEntity.ok()
+                .contentType(MediaType.parseMediaType(contentType))
+                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + resource.getFilename() + "\"")
+                .body(resource);
+    }
+}

src/main/java/com/example/demo/exception/FileStorageException.java

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+package com.example.demo.exception;
+
+import java.io.IOException;
+
+public class FileStorageException extends RuntimeException {
+    public FileStorageException(String s) {
+    }
+
+    public FileStorageException(String s, IOException ex) {
+
+    }
+}

src/main/java/com/example/demo/exception/MyFileNotFoundException.java

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+package com.example.demo.exception;
+
+import java.net.MalformedURLException;
+
+public class MyFileNotFoundException extends RuntimeException {
+    public MyFileNotFoundException(String s, MalformedURLException ex) {
+    }
+
+    public MyFileNotFoundException(String s) {
+
+    }
+}

src/main/java/com/example/demo/payload/UploadFileResponse.java

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+package com.example.demo.payload;
+
+public class UploadFileResponse {
+    private String fileName;
+    private String fileDownloadUri;
+    private String fileType;
+    private long size;
+
+    public UploadFileResponse(String fileName, String fileDownloadUri, String fileType, long size) {
+        this.fileName = fileName;
+        this.fileDownloadUri = fileDownloadUri;
+        this.fileType = fileType;
+        this.size = size;
+    }
+
+    public String getFileName() {
+        return fileName;
+    }
+
+    public void setFileName(String fileName) {
+        this.fileName = fileName;
+    }
+
+    public String getFileDownloadUri() {
+        return fileDownloadUri;
+    }
+
+    public void setFileDownloadUri(String fileDownloadUri) {
+        this.fileDownloadUri = fileDownloadUri;
+    }
+
+    public String getFileType() {
+        return fileType;
+    }
+
+    public void setFileType(String fileType) {
+        this.fileType = fileType;
+    }
+
+    public long getSize() {
+        return size;
+    }
+
+    public void setSize(long size) {
+        this.size = size;
+    }
+}

src/main/java/com/example/demo/service/FileService.java

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+package com.example.demo.service;
+
+import com.example.demo.exception.FileStorageException;
+import com.example.demo.exception.MyFileNotFoundException;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.UrlResource;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+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.StandardCopyOption;
+
+@Service
+public class FileService {
+
+
+    private Path fileStorageLocation;
+
+    public FileService(@Value("${app.files.uploads.dir}") Path fileStorageLocation) {
+        this.fileStorageLocation = fileStorageLocation;
+    }
+
+    public String store(MultipartFile file) {
+        // Normalize file name
+        String fileName = StringUtils.cleanPath(file.getOriginalFilename());
+
+        try {
+            // Check if the file's name contains invalid characters
+            if(fileName.contains("..")) {
+                throw new FileStorageException("Sorry! Filename contains invalid path sequence " + fileName);
+            }
+
+            // Copy file to the target location (Replacing existing file with the same name)
+            Path targetLocation = fileStorageLocation.resolve(fileName);
+            Files.copy(file.getInputStream(), targetLocation, StandardCopyOption.REPLACE_EXISTING);
+
+            return fileName;
+        } catch (IOException ex) {
+            throw new FileStorageException("Could not store file " + fileName + ". Please try again!", ex);
+        }
+    }
+
+    public Resource loadFileAsResource(String fileName) {
+        try {
+            Path filePath = this.fileStorageLocation.resolve(fileName).normalize();
+            Resource resource = new UrlResource(filePath.toUri());
+            if(resource.exists()) {
+                return resource;
+            } else {
+                throw new MyFileNotFoundException("File not found " + fileName);
+            }
+        } catch (MalformedURLException ex) {
+            throw new MyFileNotFoundException("File not found " + fileName, ex);
+        }
+    }
+}

src/main/resources/application.yml

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+spring:
+  servlet:
+    multipart:
+      enabled: true
+    file-size-threshold: 2KB
+    max-file-size: 2000MB
+    max-request-size: 2150MB
+
+app:
+  files:
+    uploads:
+      dir: /home/takiguchi/Developpement/Java/back-ups/demo2/files/uploads
+      # Max size in MB
+      max-size: 2000