我尝试实现一个 REST 服务，如本教程中所示： 教程
但我收到了这个错误：
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'fileStorageService' defined in file: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.airgnb.service.FileStorageService]: Constructor threw exception; nested exception is java.lang.NullPointerException
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.airgnb.service.FileStorageService]: Constructor threw exception; nested exception is java.lang.NullPointerException
Caused by: java.lang.NullPointerException
服务等级：
@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 FileStorageServiceException("Could not create the directory where the uploaded files will be stored.", ex);
}
}
}
配置类别：
@Configuration
@ConfigurationProperties(prefix = "file")
public class FileStorageProperties {
private String uploadDir;
public String getUploadDir() {
return uploadDir;
}
public void setUploadDir(String uploadDir) {
this.uploadDir = uploadDir;
}
}
该应用程序也注释如下：
@SpringBootApplication
@EnableConfigurationProperties({FileStorageProperties.class})
public class TestApp implements InitializingBean {
我认为唯一不同的是我使用 application.yml 而不是 application.properties，但我定义的属性与教程类似，但只是采用 yml 样式。
我不知道为什么FileStorageProperties没有注入，因此FileStorageService无法创建。
@Import(FileStoroageProperties.class)我已经尝试使用其他一些依赖注入方式（例如字段注入）来注释应用程序。
萧十郎
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