Java 弹簧靴筒';t autowire@ConfigurationProperties
这是我的Java 弹簧靴筒';t autowire@ConfigurationProperties,java,spring,spring-boot,bean-validation,spring-restcontroller,Java,Spring,Spring Boot,Bean Validation,Spring Restcontroller,这是我的FileStorageProperties类: @Data @ConfigurationProperties(prefix = "file") public class FileStorageProperties { private String uploadDir; } 这让我说:未通过@enableconfigurationproperties注册或标记为spring组件 这是我的文件存储服务: @Service public class FileStorag
FileStorageProperties
类:
@Data
@ConfigurationProperties(prefix = "file")
public class FileStorageProperties {
private String uploadDir;
}
这让我说:未通过@enableconfigurationproperties注册或标记为spring组件
这是我的文件存储服务
:
@Service
public class FileStorageService {
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);
}
}
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);
}
}
}
这使我错误地说:无法自动关联未找到类型的bean
这是我的项目结构:
当我尝试运行它时,它会给我:
应用程序无法启动 说明: com.mua.cse616.Service.FileStorageService中构造函数的参数0需要找不到类型为“com.mua.cse616.Property.FileStorageProperties”的bean 注入点具有以下注释: -@org.springframework.beans.factory.annotation.Autowired(必需=true) 行动: 考虑在配置中定义“com.mua.cse616.Property.FileStorageProperties”类型的bean
如何解决此问题?这是意料之中的,因为
@ConfigurationProperties
不会使一个类成为Spring组件。用@Component
标记该类,它应该可以工作。请注意,类只有在它是组件时才能被注入
编辑:来自Spring 2.2+()
@ConfigurationProperties
扫描
使用@ConfigurationProperties
注释的类现在可以通过类路径扫描找到,这是使用@EnableConfigurationProperties
或@Component
的替代方法将@configurationproperties添加到应用程序中以启用扫描。
在FileStorageProperties类中添加以下注释:
@Component
尝试使用@ConfigurationProperties和@Component进行注释
在这里,Spring Boot@ConfigurationProperties是外部化配置的注释,您可以在类级别添加@ConfigurationProperties和原型注释,例如@Component,或者将@ConfigurationProperties添加到@Bean方法。请在FileStorageProperties
中添加@Component
注释。或者您可以添加@EnableConfigurationProperties({FileStorageProperties.class})
到任何@Configuration
注释类。但是Baeldung说文档确实指出您需要提供@ConfigurationPropertiesScan
。我正在相应地更新答案