Spring 读参数

用ApplicationRunner并不优雅，实际上直接用@Value就好

application.properties

a=aaa
b=bbb

DemoApplicaiton.java

@SpringBootApplication
public class DemoApplication implements ApplicationRunner {

	@Value("${a}")
	String a;

	@Value("${b}")
	String b;

	public static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}

	@Override
	public void run(ApplicationArguments args) throws Exception {
		System.out.println(a);
		System.out.println(b);
	}
}

mvn install

java -jar target/demoapp-0.0.1-SNAPSHOT.jar 
输出
aaa
bbb

java -jar target/demoapp-0.0.1-SNAPSHOT.jar --a=123 --b=456
输出
123
456

java -jar target/demoapp-0.0.1-SNAPSHOT.jar --a=123 --b=456 --b=456
输出
123
456,456

说明后面加了参数会覆盖 application.properties,这很优雅