读取文件中的环境变量或属性

Question

我正在尝试部署spring-boot 2.0.4应用程序。配置如下所示：

@Component
@Configuration
@PropertySource("classpath:elast.properties")
public class ElastSearchLogLevel {

    private static final Logger LOG = LoggerFactory.getLogger(ElastSearchLogLevel.class);

    @Value("${elast.mail.to}")
    private String to;
...

在Windows本地运行正常，但在Linux框中显示：

WARN o.a.commons.logging.impl.Jdk14Logger.log - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'elastSearchBootApplication': Unsatisfied dependency expressed through field 'logsSearch'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'elastSearchLogLevel': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'elast.mail.to' in value "${elast.mail.to}"

实例“ elastSearchLogLevel”已自动连接到SpringBootApplication类中。理想情况下，我想提供一个可以从中读取属性的外部配置文件。正如在其中一个论坛中所建议的那样，我也曾尝试过，但是没有用。

   @PropertySource("classpath:file:///my/file/path/elast.properties")

确定更多代码：

@ComponentScan(basePackages = "some.packer.log")
@SpringBootApplication
@EnableScheduling
public class ElastSearchBootApplication {
...