Spring Boot AOP实现RESTful请求字段过滤

Spring Boot可以通过AOP的方式实现RESTful接口根据请求需要过滤嵌套对象字段的功能。具体实现步骤如下：

定义注解

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface JsonFilterAspect {
    String[] excludes() default {};
}

实现切面

@Aspect
@Component
public class JsonFilterAspectImpl {
    @Pointcut("@annotation(com.example.demo.annotation.JsonFilterAspect)")
    public void jsonFilterAspect() {}

    @Around("jsonFilterAspect()")
    public Object around(ProceedingJoinPoint point) throws Throwable {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();
        String[] excludes = point.getAnnotation(JsonFilterAspect.class).excludes();
        Object result = point.proceed();
        if (result != null && request.getMethod().equals("GET")) {
            ObjectMapper mapper = new ObjectMapper();
            mapper.setFilterProvider(new SimpleFilterProvider().addFilter("myFilter", SimpleBeanPropertyFilter.serializeAllExcept(excludes)));
            String json = mapper.writeValueAsString(result);
            result = mapper.readValue(json, Object.class);
        }
        return result;
    }
}

在Controller方法上使用注解

@GetMapping("/users")
@JsonFilterAspect(excludes = {"password"})
public List<User> getUsers() {
    return userService.getUsers();
}

其中，excludes参数表示需要过滤掉的字段名。

通过以上步骤，就可以实现RESTful接口根据请求需要过滤嵌套对象字段的功能。