Upload Multiple Files using WebFlux

spring-5-webflux-2/pom.xml

@@ -88,6 +88,20 @@
             <artifactId>mockwebserver</artifactId>
             <version>4.12.0</version> <!-- this can be removed when we migrate spring-boot-dependencies to the latest version -->
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-r2dbc</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.r2dbc</groupId>
+            <artifactId>r2dbc-h2</artifactId>
+            <scope>runtime</scope>
+        </dependency>
     </dependencies>
 
     <build>
@@ -96,6 +110,14 @@
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>16</source>
+                    <target>16</target>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 

spring-5-webflux-2/src/main/java/com/baeldung/webflux/filerecord/FileRecord.java

@@ -0,0 +1,35 @@
+package com.baeldung.webflux.filerecord;
+
+import org.springframework.data.annotation.Id;
+
+import java.util.List;
+
+public class FileRecord {
+    @Id
+    private int id;
+
+    private List<String> filenames;
+
+    public FileRecord(List<String> filenames) {
+        this.filenames = filenames;
+    }
+
+    public FileRecord() {
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public List<String> getFilenames() {
+        return filenames;
+    }
+
+    public void setFilenames(List<String> filenames) {
+        this.filenames = filenames;
+    }
+}

spring-5-webflux-2/src/main/java/com/baeldung/webflux/filerecord/FileRecordApplication.java

@@ -0,0 +1,28 @@
+package com.baeldung.webflux.filerecord;
+
+import io.r2dbc.spi.ConnectionFactory;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.r2dbc.connection.init.ConnectionFactoryInitializer;
+import org.springframework.r2dbc.connection.init.ResourceDatabasePopulator;
+
+@SpringBootApplication
+public class FileRecordApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(FileRecordApplication.class, args);
+    }
+
+    @Bean
+    ConnectionFactoryInitializer initializer(ConnectionFactory connectionFactory) {
+
+        ConnectionFactoryInitializer initializer = new ConnectionFactoryInitializer();
+        initializer.setConnectionFactory(connectionFactory);
+        initializer.setDatabasePopulator(new ResourceDatabasePopulator(new ClassPathResource("schema.sql")));
+
+        return initializer;
+    }
+
+}

spring-5-webflux-2/src/main/java/com/baeldung/webflux/filerecord/FileRecordController.java

@@ -0,0 +1,45 @@
+package com.baeldung.webflux.filerecord;
+
+import org.springframework.http.codec.multipart.FilePart;
+import org.springframework.web.bind.annotation.*;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+import java.nio.file.Paths;
+
+@RestController
+public class FileRecordController {
+
+    private final FileRecordService fileRecordService;
+
+    public FileRecordController(FileRecordService fileRecordService) {
+        this.fileRecordService = fileRecordService;
+    }
+
+    @PostMapping("/upload-files")
+    public Mono<String> uploadFileWithoutEntity(@RequestPart("files") Flux<FilePart> filePartFlux) {
+        return filePartFlux.flatMap(file -> file.transferTo(Paths.get(file.filename())))
+            .then(Mono.just("OK"))
+            .onErrorResume(error -> Mono.just("Error uploading files"));
+    }
+
+    @PostMapping("/upload-files-entity")
+    public Mono<FileRecord> uploadFileWithEntity(@RequestPart("files") Flux<FilePart> filePartFlux) {
+        FileRecord fileRecord = new FileRecord();
+
+        return filePartFlux.flatMap(filePart -> filePart.transferTo(Paths.get(filePart.filename()))
+            .then(Mono.just(filePart.filename())))
+            .collectList()
+            .flatMap(filenames -> {
+                fileRecord.setFilenames(filenames);
+                return fileRecordService.save(fileRecord);
+            })
+            .onErrorResume(error -> Mono.error(error));
+    }
+
+    @GetMapping("/files/{id}")
+    public Mono<FileRecord> geFilesById(@PathVariable("id") int id) {
+        return fileRecordService.findById(id)
+            .onErrorResume(error -> Mono.error(error));
+    }
+}

spring-5-webflux-2/src/main/java/com/baeldung/webflux/filerecord/FileRecordRepository.java

@@ -0,0 +1,8 @@
+package com.baeldung.webflux.filerecord;
+
+import org.springframework.data.r2dbc.repository.R2dbcRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface FileRecordRepository extends R2dbcRepository<FileRecord, Integer> {
+}

spring-5-webflux-2/src/main/java/com/baeldung/webflux/filerecord/FileRecordService.java

@@ -0,0 +1,23 @@
+package com.baeldung.webflux.filerecord;
+
+import org.springframework.stereotype.Service;
+import reactor.core.publisher.Mono;
+
+@Service
+public class FileRecordService {
+
+    private FileRecordRepository fileRecordRepository;
+
+    public FileRecordService(FileRecordRepository fileRecordRepository) {
+        this.fileRecordRepository = fileRecordRepository;
+    }
+
+    public Mono<FileRecord> save(FileRecord fileRecord) {
+        return fileRecordRepository.save(fileRecord);
+    }
+
+    public Mono<FileRecord> findById(int id) {
+        return fileRecordRepository.findById(id);
+    }
+
+}

spring-5-webflux-2/src/main/resources/application.properties

@@ -0,0 +1 @@
+spring.r2dbc.url=r2dbc:h2:file:///./testdb

spring-5-webflux-2/src/main/resources/schema.sql

@@ -0,0 +1,5 @@
+CREATE TABLE IF NOT EXISTS file_record ( 
+  id INT NOT NULL AUTO_INCREMENT, 
+  filenames VARCHAR(255), 
+  PRIMARY KEY (id) 
+);

spring-5-webflux-2/src/test/java/com/baeldung/webflux/filerecord/FileRecordControllerIntegrationTest.java

@@ -0,0 +1,98 @@
+package com.baeldung.webflux.filerecord;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.http.MediaType;
+import org.springframework.mock.web.MockMultipartFile;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+import org.springframework.test.web.reactive.server.WebTestClient;
+import org.springframework.util.LinkedMultiValueMap;
+import reactor.core.publisher.Mono;
+
+import java.util.List;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(SpringExtension.class)
+@SpringBootTest(classes = FileRecordController.class)
+@ContextConfiguration(classes = { FileRecordController.class })
+@ComponentScan("com.baeldung.webflux.filerecord")
+@AutoConfigureWebTestClient
+class FileRecordControllerIntegrationTest {
+
+    @Autowired
+    private WebTestClient webTestClient;
+
+    @MockBean
+    private FileRecordService fileRecordService;
+
+    @Test
+    public void givenUploadFilesWithEntity_whenRequestIsValid_thenReturnCreated() throws Exception {
+
+        FileRecord fileRecord = new FileRecord();
+        MockMultipartFile firstFile = new MockMultipartFile("file", "baeldungdata.txt", MediaType.TEXT_PLAIN_VALUE, "Test file content".getBytes());
+        MockMultipartFile secondFile = new MockMultipartFile("file", "baeldungdata.pdf", MediaType.TEXT_PLAIN_VALUE, "Test file content".getBytes());
+        List<MockMultipartFile> files = List.of(firstFile, secondFile);
+        fileRecord.setFilenames(files.stream()
+            .map(MockMultipartFile::getOriginalFilename)
+            .toList());
+
+        Mono<FileRecord> fileRecordMono = Mono.just(fileRecord);
+        when(fileRecordService.save(any(FileRecord.class))).thenReturn(fileRecordMono);
+
+        webTestClient.post()
+            .uri("/upload-files-entity")
+            .body(Mono.just(fileRecord), FileRecord.class)
+            .exchange()
+            .expectBody(FileRecord.class);
+
+    }
+
+    @Test
+    public void givenUploadFiles_whenRequestIsValid_thenReturnOk() throws Exception {
+
+        MockMultipartFile firstFile = new MockMultipartFile("file", "baeldungdata.txt", MediaType.TEXT_PLAIN_VALUE, "Test file content".getBytes());
+        MockMultipartFile secondFile = new MockMultipartFile("file", "baeldungdata.pdf", MediaType.TEXT_PLAIN_VALUE, "Test file content".getBytes());
+        LinkedMultiValueMap<String, MockMultipartFile> multipartData = new LinkedMultiValueMap<>();
+        multipartData.add("file", firstFile);
+        multipartData.add("file", secondFile);
+
+        webTestClient.post()
+            .uri("/upload-files")
+            .bodyValue(multipartData)
+            .exchange()
+            .expectStatus()
+            .isOk();
+    }
+
+    @Test
+    public void givenUploadFilesWithEntity_whenRequestFileIsFindById_thenReturnOk() throws Exception {
+
+        FileRecord fileRecord = new FileRecord();
+        MockMultipartFile firstFile = new MockMultipartFile("file", "baeldungdata.txt", MediaType.TEXT_PLAIN_VALUE, "Test file content".getBytes());
+        MockMultipartFile secondFile = new MockMultipartFile("file", "baeldungdata.pdf", MediaType.TEXT_PLAIN_VALUE, "Test file content".getBytes());
+        List<MockMultipartFile> files = List.of(firstFile, secondFile);
+        fileRecord.setId(1);
+        fileRecord.setFilenames(files.stream()
+            .map(MockMultipartFile::getOriginalFilename)
+            .toList());
+
+        Mono<FileRecord> fileRecordMono = Mono.just(fileRecord);
+
+        when(fileRecordService.findById(1)).thenReturn(fileRecordMono);
+
+        webTestClient.get()
+            .uri("/files/{id}", 1)
+            .exchange()
+            .expectStatus()
+            .isOk();
+    }
+
+}