springboot中aop的写法

自定义注解

注解用于标识需要进行代码增强的方法

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface AutoFill {
    OperationType value();
}

target注解标识注解生效类型，retention指定注解的保留周期，OperationType为枚举类型，指定属性值的类型，value为自定义的属性

自定义切面类

统一拦截加上了AutoFill注解的方法

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始加入公共字段自动填充");
        //获取被拦截方法的数据库方法操作类型
        MethodSignature methodSignature=(MethodSignature)joinPoint.getSignature();
        AutoFill annotation = methodSignature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = annotation.value();
        //获取被拦截方法的参数
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];
        //根据不同的操作类型，通过反射为对应的属性进行赋值
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        if(operationType == OperationType.INSERT) {
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }else if(operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

在方法上加上注解

    @AutoFill(value = OperationType.INSERT)
    @Insert("insert into employee (name, username, password, phone, sex, id_number, create_time, update_time, create_user, update_user)" +
            "values (#{name},#{username},#{password},#{phone},#{sex},#{idNumber},#{createTime},#{updateTime},#{createUser},#{updateUser})")
    void insert(Employee employee);


    @AutoFill(value = OperationType.UPDATE)
    void update(Employee employee);