springboot读取非classpath下配置文件，并且支持注解使用

迷南。 2022-06-02 00:20 261阅读 0赞

springboot加载配置文件路径：src下为classpath，src同级目录为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);//将读取的所有配置载入SpringApplication中
    	    builder.build().run(args);
    //		SpringApplication.run(Application.class, args);
    	}
    
    }

springboot的applition启动时，会扫描配置的包路径下的注解，当注解使用了配置文件中的属性值，那么则要求SpringApplication对象的sources属性必须包含此属性key。

查看SpringApplicationBuilder源码：

public SpringApplication build(String... args) {
            this.configureAsChildIfNecessary(args);
            this.application.setSources(this.sources);//spring配置文件参数设置给application对象
            return this.application;
     }

另外main函数中可以写成：

SpringApplication.run(Application.class, args);
    SpringApplication源码：

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);
        }