Boss.java

@Configuration
public class Boss {
    @PostConstruct
    public void init() {
        System.out.println("Creating Boss.");
    }

    @Bean
    public Boss getBoss() {
        return new Boss();
    }
}

SampleController.java

@Controller
@EnableAutoConfiguration
public class SampleController {
    @RequestMapping("/")
    @ResponseBody
    String home() {
        @SuppressWarnings("resource")
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Boss.class);
        return "Hello World";
    }

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

為何通過AnnotationConfigApplicationContext加載后@PostConstruct修飾的方法會被執(zhí)行兩次

訪問http://localhost:8080/連續(xù)輸出
Creating Boss.
Creating Boss.