sringboot项目如何通过编程式使用指定路径下的application.properties

注意：jar包里如果有application.properties文件，会覆盖编程里指定的配置文件

@SpringBootApplication
public class IogTagApp {

    public static void main(String[] args) throws Exception{
//        SpringApplication.run(IogTagApp.class, args);

        Properties defaultProperties = new Properties();
        InputStream in;
        try {
            in = new FileInputStream("/app/conf/application.properties");
            defaultProperties.load(in);
            in.close();
        } catch (IOException e) {
        }
        SpringApplication app = new SpringApplication(IogTagApp.class);
        app.setDefaultProperties(defaultProperties);
        app.run(args);
    }