【发布时间】：2020-05-16 11:42:20
【问题描述】：
我是 Spring Boot 新手，在编写文件上传 API 时遇到以下错误：
Error:Description:
Field fileStorageService in com.primesolutions.fileupload.controller.FileController required a bean of type 'com.primesolutions.fileupload.service.FileStorageService' that could not be found.
The injection point has the following annotations:
- @org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean of type 'com.primesolutions.fileupload.service.FileStorageService' in your configuration.*
控制器类：
public class FileController
{
private static final Logger logger = LoggerFactory.getLogger(FileController.class);
@Autowired
private FileStorageService fileStorageService;
@PostMapping("/uploadFile")
public UploadFileResponse uploadFile(@RequestParam("file") MultipartFile file) {
String fileName = fileStorageService.storeFile(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 -> uploadFile(file))
.collect(Collectors.toList());
}
}
服务类：
private final Path fileStorageLocation;
@Autowired
public FileStorageService(FileStorageProperties fileStorageProperties) {
this.fileStorageLocation = Paths.get(fileStorageProperties.getUploadDir())
.toAbsolutePath().normalize();
try {
Files.createDirectories(this.fileStorageLocation);
} catch (Exception ex) {
throw new FileStorageException("Could not create the directory where the uploaded files will be stored.", ex);
}
}
public String storeFile(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 = this.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);
}
}
配置类：
@ConfigurationProperties(prefix = "file")
public class FileStorageProperties {
private String uploadDir;
public String getUploadDir()
{
return uploadDir;
}
public void setUploadDir(String uploadDir) {
this.uploadDir = uploadDir;
}
}
主要：
@SpringBootApplication
@EnableConfigurationProperties({
FileStorageProperties.class
})
public class FileApplication {
public static void main(String[] args) {
SpringApplication.run(FileApplication.class, args);
}
}
属性文件
## MULTIPART (MultipartProperties)
# Enable multipart uploads
spring.servlet.multipart.enabled=true
# Threshold after which files are written to disk.
spring.servlet.multipart.file-size-threshold=2KB
# Max file size.
spring.servlet.multipart.max-file-size=200MB
# Max Request Size
spring.servlet.multipart.max-request-size=215MB
## File Storage Properties
# All files uploaded through the REST API will be stored in this directory
file.upload-dir=C:/Projects/SpringBootProject/Primesolutions/PrimeSolutions/FileUpload
我正在尝试读取文件上传属性并将其传递给控制器类。
【问题讨论】：
-
你的
FileStorageService类是用@Service或@Component注释的吗？从您包含的代码中不清楚。 -
No jordan 它是用@Autowired 注释的
-
你的构造函数用
@Autowired注解，但是为了让Spring能够接受一个类并将其自动装配到其他类中，整个类需要用@Component注解，或者其中之一实现相同接口的其他注解（例如@Service或@Controller）。这让 Spring 知道这个类应该由 Spring 管理。如果您使用@Service在顶层（就在public class FileStorageService上方）注释您的服务，那应该可以解决您的问题。
标签： java spring-boot