Spring - 服务中构造函数的错误参数 0 需要找不到类型为 Configuration 的 bean
Spring - Error Parameter 0 of constructor in Service required a bean of type Configuration that could not be found
我按照 tutorial 上传文件,但最后出现以下错误:
Parameter 0 of constructor in nu.pk.cv.storage.FileSystemStorageService required a bean of type 'nu.pk.cv.storage.StorageProperties' that could not be found.
Action:
Consider defining a bean of type 'nu.pk.cv.storage.StorageProperties' in your configuration
我知道我所做的唯一区别是我使用 @RestController
而不是仅 @Controller
并且我的控制器在另一个子包中而不是在父包中。我的存储 类 在 nu.pk.cv.storage
而我的控制器在 nu.pk.cv.cv
.
存储属性
package nu.pk.cv.storage;
@ConfigurationProperties("storage")
public class StorageProperties {
private String location = "/tmp/cv-gen";
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
}
文件系统存储服务
package nu.pk.cv.storage;
@Service
public class FileSystemStorageService implements StorageService {
private final Path rootLocation;
@Autowired
public FileSystemStorageService(StorageProperties properties) {
this.rootLocation = Paths.get(properties.getLocation());
}
@Override
public void store(MultipartFile file) {
String filename = StringUtils.cleanPath(file.getOriginalFilename());
try {
if (file.isEmpty()) {
throw new StorageException("Failed to store empty file " + filename);
}
if (filename.contains("..")) {
// This is a security check
throw new StorageException(
"Cannot store the file with relative path outside the current directory "
+ filename);
}
try (InputStream inputStream = file.getInputStream()) {
Files.copy(inputStream, this.rootLocation.resolve(filename),
StandardCopyOption.REPLACE_EXISTING);
}
}
catch (IOException e) {
throw new StorageException("Failed to store file " + filename, e);
}
}
@Override
public Stream<Path> loadAll() {
try {
return Files.walk(this.rootLocation, 1)
.filter(path -> !path.equals(this.rootLocation))
.map(this.rootLocation::relativize);
}
catch (IOException e) {
throw new StorageException("Failed to read stored files", e);
}
}
@Override
public Path load(String filename) {
return rootLocation.resolve(filename);
}
@Override
public Resource loadAsResource(String filename) {
try {
Path file = load(filename);
Resource resource = new UrlResource(file.toUri());
if (resource.exists() || resource.isReadable()) {
return resource;
}
else {
throw new StorageFileNotFoundException(
"Could not read file: " + filename);
}
}
catch (MalformedURLException e) {
throw new StorageFileNotFoundException("Could not read file: " + filename, e);
}
}
@Override
public void deleteAll() {
FileSystemUtils.deleteRecursively(rootLocation.toFile());
}
@Override
public void init() {
try {
Files.createDirectories(rootLocation);
}
catch (IOException e) {
throw new StorageException("Could not initialize storage", e);
}
}
}
我的控制器
package nu.pk.cv.cv;
@RestController
public class CV {
@Autowired
private StorageService storageService;
@PostMapping("/api/cv/generate")
public String generate(@RequestParam("files") MultipartFile file) {
storageService.store(file);
return "Mjau";
}
}
根据 Baeldung article,您还需要将 @Configuration
添加到您的 class:
@Configuration
@ConfigurationProperties("storage")
public class StorageProperties
在 StorageProperties 添加注释 @Configuration 或 @Component class。
@Configuration
@ConfigurationProperties("storage")
public class StorageProperties {
或
@Component
@ConfigurationProperties("storage")
public class StorageProperties {
如果您收到类似 "a bean not found or a bean of type configuration" 的错误,则必须检查相关 classes 中的 @Component、@Service 或 @Repository 注释。
参考:Spring blog
如果你想要构造函数注入(例如对于 lombok 或缺少的 setter),你必须在类型级别或在特定构造函数(如果有多个)上用 @ConstructorBinding
声明它。
@Configuration
@ConfigurationProperties("storage")
@ConstructorBinding
public class StorageProperties{
or
@Configuration
@ConfigurationProperties("storage")
public class StorageProperties{
public StorageProperties(){...}
@ConstructorBinding
public StorageProperties(String location){this.location = location; ...}
我按照 tutorial 上传文件,但最后出现以下错误:
Parameter 0 of constructor in nu.pk.cv.storage.FileSystemStorageService required a bean of type 'nu.pk.cv.storage.StorageProperties' that could not be found.
Action:
Consider defining a bean of type 'nu.pk.cv.storage.StorageProperties' in your configuration
我知道我所做的唯一区别是我使用 @RestController
而不是仅 @Controller
并且我的控制器在另一个子包中而不是在父包中。我的存储 类 在 nu.pk.cv.storage
而我的控制器在 nu.pk.cv.cv
.
存储属性
package nu.pk.cv.storage;
@ConfigurationProperties("storage")
public class StorageProperties {
private String location = "/tmp/cv-gen";
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
}
文件系统存储服务
package nu.pk.cv.storage;
@Service
public class FileSystemStorageService implements StorageService {
private final Path rootLocation;
@Autowired
public FileSystemStorageService(StorageProperties properties) {
this.rootLocation = Paths.get(properties.getLocation());
}
@Override
public void store(MultipartFile file) {
String filename = StringUtils.cleanPath(file.getOriginalFilename());
try {
if (file.isEmpty()) {
throw new StorageException("Failed to store empty file " + filename);
}
if (filename.contains("..")) {
// This is a security check
throw new StorageException(
"Cannot store the file with relative path outside the current directory "
+ filename);
}
try (InputStream inputStream = file.getInputStream()) {
Files.copy(inputStream, this.rootLocation.resolve(filename),
StandardCopyOption.REPLACE_EXISTING);
}
}
catch (IOException e) {
throw new StorageException("Failed to store file " + filename, e);
}
}
@Override
public Stream<Path> loadAll() {
try {
return Files.walk(this.rootLocation, 1)
.filter(path -> !path.equals(this.rootLocation))
.map(this.rootLocation::relativize);
}
catch (IOException e) {
throw new StorageException("Failed to read stored files", e);
}
}
@Override
public Path load(String filename) {
return rootLocation.resolve(filename);
}
@Override
public Resource loadAsResource(String filename) {
try {
Path file = load(filename);
Resource resource = new UrlResource(file.toUri());
if (resource.exists() || resource.isReadable()) {
return resource;
}
else {
throw new StorageFileNotFoundException(
"Could not read file: " + filename);
}
}
catch (MalformedURLException e) {
throw new StorageFileNotFoundException("Could not read file: " + filename, e);
}
}
@Override
public void deleteAll() {
FileSystemUtils.deleteRecursively(rootLocation.toFile());
}
@Override
public void init() {
try {
Files.createDirectories(rootLocation);
}
catch (IOException e) {
throw new StorageException("Could not initialize storage", e);
}
}
}
我的控制器
package nu.pk.cv.cv;
@RestController
public class CV {
@Autowired
private StorageService storageService;
@PostMapping("/api/cv/generate")
public String generate(@RequestParam("files") MultipartFile file) {
storageService.store(file);
return "Mjau";
}
}
根据 Baeldung article,您还需要将 @Configuration
添加到您的 class:
@Configuration
@ConfigurationProperties("storage")
public class StorageProperties
在 StorageProperties 添加注释 @Configuration 或 @Component class。
@Configuration
@ConfigurationProperties("storage")
public class StorageProperties {
或
@Component
@ConfigurationProperties("storage")
public class StorageProperties {
如果您收到类似 "a bean not found or a bean of type configuration" 的错误,则必须检查相关 classes 中的 @Component、@Service 或 @Repository 注释。
参考:Spring blog
如果你想要构造函数注入(例如对于 lombok 或缺少的 setter),你必须在类型级别或在特定构造函数(如果有多个)上用 @ConstructorBinding
声明它。
@Configuration
@ConfigurationProperties("storage")
@ConstructorBinding
public class StorageProperties{
or
@Configuration
@ConfigurationProperties("storage")
public class StorageProperties{
public StorageProperties(){...}
@ConstructorBinding
public StorageProperties(String location){this.location = location; ...}