SpringMVC的Body参数拦截的问题

SpringMVC对出参和入参有非常友好的拓展支持,方便你对数据的输入和输出有更大的执行权，我们如何通过SpringMVC定义的结果做一系列处理呢？

入参

RequestBodyAdvice : 针对所有以@RequestBody的参数做处理

参考案例 : JsonViewRequestBodyAdvice

public class JsonViewRequestBodyAdvice extends RequestBodyAdviceAdapter {

  
  @Override
  public boolean supports(MethodParameter methodParameter, Type targetType,
      Class> converterType) {
 
    return (AbstractJackson2HttpMessageConverter.class.isAssignableFrom(converterType) &&
 methodParameter.getParameterAnnotation(JsonView.class) != null);
  }

    // 这里就是具体的前置操作了... 下面的例子就是查找这个入参方法是否有@JsonView修饰
  @Override
  public HttpInputMessage beforeBodyRead(HttpInputMessage inputMessage, MethodParameter methodParameter,
      Type targetType, Class> selectedConverterType) throws IOException {

    JsonView annotation = methodParameter.getParameterAnnotation(JsonView.class);
    Class[] classes = annotation.value();
    if (classes.length != 1) {
      throw new IllegalArgumentException(
   "@JsonView only supported for request body advice with exactly 1 class argument: " + methodParameter);
    }
    return new MappingJacksonInputMessage(inputMessage.getBody(), inputMessage.getHeaders(), classes[0]);
  }
}

出参

ResponseBodyAdvice: 针对所有以@ResponseBody的参数做处理

参考案例:

@ControllerAdvice
public class LogResponseBodyAdvice implements ResponseBodyAdvice {
 
  
  @Override
  public boolean supports(MethodParameter returnType, Class converterType) {
    return true;
  }

  @Override
  public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
    // 做任何事情 body 就是返回的结果对象,没有处理之前
    return body; 
  }
}

注意事项

自定义的处理对象类上必须得加上@ControllerAdvice注解!

为什么?

源码中RequestMappingHandlerAdapter类在执行initControllerAdviceCache()做初始化的时候会执行一个

List beans = ControllerAdviceBean.findAnnotatedBeans(getApplicationContext());
AnnotationAwareOrderComparator.sort(beans);

而ControllerAdviceBean.findAnnotatedBeans方法会查找类上有ControllerAdvice注解的类才会加入到处理当中..

public static List findAnnotatedBeans(ApplicationContext applicationContext) {
    List beans = new ArrayList();
    for (String name : BeanFactoryUtils.beanNamesForTypeIncludingAncestors(applicationContext, Object.class)) {
      if (applicationContext.findAnnotationOnBean(name, ControllerAdvice.class) != null) {
 beans.add(new ControllerAdviceBean(name, applicationContext));
      }
    }
    return beans;
  }

所以大家可以根据自己的需要,定义结果的入参和出参结果做一些特殊处理.....

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。