Springboot自定义注解&传参&简单应用

Springboot自定义注解&传参&简单应用

1、目录结构：

1.1 annotation为自定义注解位置

2、自定义注解

2.1 自定义两个注解LogController、TimeConsuming用来记录日志和统计方法耗时，其中LogController有三个参数

@Target({ElementType.PARAMETER, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface LogController {
    // 具体操作
    String description();

    // 日志级别
    int logLevel() default LogLevelConstant.INFO;

    // 日志进程/方法名
    String method();
}

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface TimeConsuming {
}

3、注解使用

3.1 在需要记录日志和统计方法耗时的方法上使用注解

 	@PostMapping("/createUser")
    @LogController(description = "创建用户", method = "/createUser")
    @TimeConsuming
    public ResponseEntity<ResponseResultVO> createUser(@Valid @RequestBody SysUsersVo sysUsersVo) {
        log.info("UserManager = start create user [{}] pwd [{}]", sysUsersVo.getUserName(), sysUsersVo.getUserPwd());

        return ResponseEntity.ok(usersService.createUser(sysUsersVo).orElse(ResponseResultVO.builder()
                .code(ErrorCodeConstant.SYSTEM_ERROR)
                .msg(ErrorMsgConstant.SYSTEM_ERROR)
                .build()));
    }

4、使用Aspect实现功能

4.1 通过Aop以注解作为切点切入方法，实现业务功能

	@Pointcut("@annotation(com.pet.annotation.LogController)")
    public void annotationPoint() {
    }

    @Pointcut("@annotation(com.pet.annotation.TimeConsuming)")
    public void methodTimePoint() {
    }

4.2 取注解中参数

比如下面方法实现记录日志功能

    @Before(value = "annotationPoint() && @annotation(logController)", argNames = "joinPoint, logController")
    public void beforeController(JoinPoint joinPoint, LogController logController) {
        HttpServletRequest request = ((ServletRequestAttributes) Objects.requireNonNull(RequestContextHolder.getRequestAttributes())).getRequest();
        HttpSession session = request.getSession();
        SysUsers user = (SysUsers) session.getAttribute(HttpConstant.SESSION_USER);
        String realMethodName = joinPoint.getSignature().getName();

        log.info("Aspect = [{}] ,user [{}] , method [{}] , logLevel [{}] , do [{}] , realMethod [{}]",
                new Date(), user == null ? "system" : user.getUserName(), logController.method(), logController.logLevel(), logController.description(), realMethodName);

        // 异步处理日志
        publisher.publishEvent(new LogToDbEvent(
                LogToDbEventEntity.builder()
                        .date(new Date())
                        .userName(user == null ? "system" : user.getUserName())
                        .method(logController.method())
                        .logLevel(logController.logLevel())
                        .description(logController.description())
                        .realMethod(realMethodName)
                        .build()));
    }

统计方法耗时方法

	@Around(value = "methodTimePoint()")
    public Object apiTimeConsuming(ProceedingJoinPoint pjp) throws Throwable {
        long begin = System.currentTimeMillis();
        String method = pjp.getSignature().getName();
        String className = pjp.getTarget().getClass().getName();

        Object ret = pjp.proceed();
        log.info("Aspect = [{}] ,class [{}] , method [{}] , time consuming[{}]", new Date(), className, method, System.currentTimeMillis() - begin);
        return ret;
    }