springboot載入配置檔案路徑：src下為classpath，src同級目錄為file。

@SpringBootApplication
@PropertySource(value = {"file:config/application.yml","file:config/application-dev.yml",
"file:config/application-pro.yml","file:config/application-pro.yml"})
public class Application {
	static {
		System.setProperty("log4j.configurationFile", "file:config/log4j2.xml");
	}
	public static void main(String[] args) {
	    SpringApplicationBuilder builder = new SpringApplicationBuilder();
	    builder.sources(Application.class);//將讀取的所有配置載入SpringApplication中
	    builder.build().run(args);
//		SpringApplication.run(Application.class, args);
	}

}
 

檢視SpringApplicationBuilder原始碼：

 public SpringApplication build(String... args) {
        this.configureAsChildIfNecessary(args);
        this.application.setSources(this.sources);//spring配置檔案引數設定給application物件
        return this.application;
 }
 

SpringApplication.run(Application.class, args);

    public static ConfigurableApplicationContext run(Object source, String... args) {
        return run(new Object[]{source}, args);
    }

    public static ConfigurableApplicationContext run(Object[] sources, String[] args) {
        return (new SpringApplication(sources)).run(args);
    }

    public static void main(String[] args) throws Exception {
        run(new Object[0], args);
    }