@Order

@Order

@Order用于指定Bean的执行顺序(也会影响加载顺序), 数字越小优先级越高, 默认Ordered.LOWEST_PRECEDENCE

假设有两全局异常处理类处理相同的错误, 谁的优先级高会先调用谁

handler1

@Slf4j
@Order(Ordered.HIGHEST_PRECEDENCE)
//@Order(Ordered.LOWEST_PRECEDENCE)
@RestControllerAdvice
public class Handler1 {
    public Handler1() throws InterruptedException {
        TimeUnit.SECONDS.sleep(2);
        System.out.println("handler1 注入 ioc ....");
    }
    @ExceptionHandler(NullPointerException.class)
    private String catche(){
        log.warn("handler1 调用");
        return "handler1";
    }
}

handler2

@Slf4j
@Order(Ordered.LOWEST_PRECEDENCE)
//@Order(Ordered.HIGHEST_PRECEDENCE)
@RestControllerAdvice
public class Handler2 {
    public Handler2() {
        System.out.println("handler2 注入 ioc ....");
    }

    @ExceptionHandler(NullPointerException.class)
    private String catche(){
        log.warn("handler2 调用");
        return "handler2";
    }
}

controller

@RestController
public class Controller {
    @GetMapping("/get")
    @ResponseBody
    public void get() {
        throw new NullPointerException();
    }
}

先让Handler1 注入时休眠2s, 此时Handler1的@Order(Ordered.HIGHEST_PRECEDENCE) 是最高等级

运行发现

说明@order决定pojo注入的ioc的先后顺序

我们发送请求看一看

然后我们交换优先级, 发送get请求

从结果可以明显看出优先级高的异常处理器被调用了

说明@order也决定执行顺序