使用BeanPostProcessor在Spring中自定义注释 [英] Custom Annotation in Spring with BeanPostProcessor
问题描述
我们正在尝试在Spring中为其余api创建自定义注释.我是创建自定义注释的新手，下面给出了代码段
Spring Boot App-
@SpringBootApplication
@ComponentScan(basePackageClasses = {ServiceController.class, CustomAnnotatorProcessor.class})
public class ServiceApp {
public static void main(String[] args) {
SpringApplication.run(ServiceApp.class, args);
}
}
RestController-
@RestController
public class ServiceController {
@RequestMapping(method = RequestMethod.GET, value="/service/v1/version")
@ApiResponses(value = {
@ApiResponse(code = 200, message = "Success", response = String.class),
@ApiResponse(code = 401, message = "Unauthorized"),
@ApiResponse(code = 403, message = "Forbidden"),
@ApiResponse(code = 404, message = "Not Found"),
@ApiResponse(code = 500, message = "Failure")})
@CustomAnnotation()
public String getVersion() {
return "success";
}
}
自定义注释-
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
@Documented
public @interface CustomAnnotation {
}
注释处理器-
@Component
public class CustomAnnotatorProcessor implements BeanPostProcessor {
private ConfigurableListableBeanFactory configurableBeanFactory;
@Autowired
public CustomAnnotatorProcessor(ConfigurableListableBeanFactory beanFactory) {
this.configurableBeanFactory = beanFactory;
}
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
return bean;
}
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
MethodCallback methodCallback = new CustomAnnotationMethodCallback(configurableBeanFactory, bean);
ReflectionUtils.doWithMethods(bean.getClass(), methodCallback);
return bean;
}
方法回调-
public class CustomAnnotationMethodCallback implements MethodCallback{
@Override
public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException {
if (method.isAnnotationPresent(CustomAnnotation.class)) {
System.out.println("doWith is getting called for CustomAnnotationMethodCallback");
ReflectionUtils.makeAccessible(method);
//DO VALIDATION WHETHER A SPECIFIC HEADER IS PRESENT IN THE GIVEN REQUEST
return;
}
}
}
我正在尝试在实现BeanPostProcessor的类中处理自定义批注，但是我遇到了问题
问题_1 :回调仅被调用一次，但是我无法对/service/v1/version API中的每个请求都应用验证.我需要针对每个请求进行验证，如果可以的话，我们的设计/方法是否正确，如何解决?
问题_2 :如果我需要将完整的请求对象(带有标头单独)传递给@customAnnotation，该怎么办?
如果您需要更多详细信息，请告诉我
谢谢
问题_1 :回调仅被调用一次，但我无法对传入 问题_2 :如果我需要将完整的请求对象(带有标头单独)传递给我的 我认为您应该使用Annotation以外的spring AOP或Interceptor. We are trying to create a Custom Annotation for our rest api in Spring. I am new to creating custom annotation, I have given the code snippet below Spring Boot App -- RestController -- Custom Annotation -- Annotation Processor -- Method Callback -- I am trying to process the custom annotation in a class which implements BeanPostProcessor but I have an issue Issue_1: The callback is getting called once but I am not able apply the validation for every request that is coming to the /service/v1/version API. I need to validate on every request, is our design / approach correct if so how to solve this problem, if not please suggest a different approach Issue_2: If I need to pass the complete request object (alone with the header) to my @customAnnotation, how should I do that? Please let me know if you need further details Thanks Issue_1: The callback is getting called once but I am not able apply the validation for every request that is coming to the Issue_2: If I need to pass the complete request object (alone with the header) to my I think you should use spring AOP or Interceptor other than Annotation. 这篇关于使用BeanPostProcessor在Spring中自定义注释的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！@customAnnotation，我该怎么做?@SpringBootApplication
@ComponentScan(basePackageClasses = {ServiceController.class, CustomAnnotatorProcessor.class})
public class ServiceApp {
public static void main(String[] args) {
SpringApplication.run(ServiceApp.class, args);
}
}
@RestController
public class ServiceController {
@RequestMapping(method = RequestMethod.GET, value="/service/v1/version")
@ApiResponses(value = {
@ApiResponse(code = 200, message = "Success", response = String.class),
@ApiResponse(code = 401, message = "Unauthorized"),
@ApiResponse(code = 403, message = "Forbidden"),
@ApiResponse(code = 404, message = "Not Found"),
@ApiResponse(code = 500, message = "Failure")})
@CustomAnnotation()
public String getVersion() {
return "success";
}
}
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
@Documented
public @interface CustomAnnotation {
}
@Component
public class CustomAnnotatorProcessor implements BeanPostProcessor {
private ConfigurableListableBeanFactory configurableBeanFactory;
@Autowired
public CustomAnnotatorProcessor(ConfigurableListableBeanFactory beanFactory) {
this.configurableBeanFactory = beanFactory;
}
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
return bean;
}
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
MethodCallback methodCallback = new CustomAnnotationMethodCallback(configurableBeanFactory, bean);
ReflectionUtils.doWithMethods(bean.getClass(), methodCallback);
return bean;
}
public class CustomAnnotationMethodCallback implements MethodCallback{
@Override
public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException {
if (method.isAnnotationPresent(CustomAnnotation.class)) {
System.out.println("doWith is getting called for CustomAnnotationMethodCallback");
ReflectionUtils.makeAccessible(method);
//DO VALIDATION WHETHER A SPECIFIC HEADER IS PRESENT IN THE GIVEN REQUEST
return;
}
}
}
/service/v1/version API. I need to validate on every request, is our design / approach correct if so how to solve this problem, if not please suggest a different approach@customAnnotation, how should I do that?
