springboot基于注解aop
我们现在创建一个去掉参数空格的aop
1.创建Annotation

/**
 * 加上该注解，可以去掉方法参数对象中String类型字段的前后空格
 * 如果exclude设置为true，则不会去掉该字段的前后空格
 */
@Target({ElementType.METHOD, ElementType.TYPE, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface TrimBlankAnnotation {
    boolean exclude() default false;
}

2.创建Aspect

@Aspect
@Component
@Configuration
@Slf4j
public class TrimBlankAspect {
    @Pointcut("@annotation(com.paic.property.cfom.common.annotation.TrimBlankAnnotation)")
    public void pointcut() {
    }

    @Before(value = "pointcut()")
    public void before(JoinPoint joinPoint) {
        Object[] args = joinPoint.getArgs();
        if(args != null && args.length > 0){
            for (Object obj : args) {
                process(obj);
            }
        }
    }

    private void process(Object obj) {
        if (obj == null) {
            return;
        }
        Class clazz = obj.getClass();
        if (clazz.isArray()) {
            Object[] arrayObj = (Object[]) obj;
            if (arrayObj != null && arrayObj.length > 0) {
                trimBlank(arrayObj);
            }
        } else if (obj instanceof Collection) {
            Collection objects = (Collection) obj;
            if (objects != null && objects.size() > 0) {
                trimBlank(objects.toArray());
            }
        } else if (clazz.isAnnotationPresent(TrimBlankAnnotation.class)) {
            trimBlank(obj);
        }
    }

    private void trimBlank(Object[] objects) {
        for (Object obj : objects) {
            process(obj);
        }
    }

    private void trimBlank(Object obj) {
        Class clazz = obj.getClass();
        Field[] fields = clazz.getDeclaredFields();
        try {
            for (Field field : fields) {
                Class fieldType = field.getType();
                if (fieldType == String.class) {
                    TrimBlankAnnotation fieldAnnotation = field.getAnnotation(TrimBlankAnnotation.class);
                    if (fieldAnnotation == null || !fieldAnnotation.exclude()) {
                        field.setAccessible(true);
                        Object fieldValue = field.get(obj);
                        if (fieldValue != null) {
                            field.set(obj, fieldValue.toString().trim());
                        }
                        field.setAccessible(false);
                    }
                } else {
                    field.setAccessible(true);
                    Object fieldValue = field.get(obj);
                    field.setAccessible(false);
                    process(fieldValue);
                }
            }
        } catch (Exception ex) {
            log.error("TrimBlankAspect异常[{}]", obj, ex);
        }
    }
}

3.应用aop注解