请求参数的自定义Spring批注

正如大家在评论中所说，您可以轻松编写注释驱动的自定义解析器。四个简单的步骤

1. 创建一个注释，例如

@Target(ElementType.PARAMETER)@Retention(RetentionPolicy.RUNTIME)@documentedpublic @interface UpperCase {    String value();}

1. 写一个解析器，例如

public class UpperCaseResolver implements HandlerMethodArgumentResolver {    public boolean supportsParameter(MethodParameter parameter) {        return parameter.getParameterAnnotation(UpperCase.class) != null;    }    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {        UpperCase attr = parameter.getParameterAnnotation(UpperCase.class);        return webRequest.getParameter(attr.value()).toUpperCase();    }}

1. 注册解析器

<mvc:annotation-driven>        <mvc:argument-resolvers> <bean ></bean>        </mvc:argument-resolvers></mvc:annotation-driven>

或Java配置

    @Configuration    @EnableWebMvc    public class Config extends WebMvcConfigurerAdapter {    ...      @Override      public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {          argumentResolvers.add(new UpperCaseResolver());      }    ...    }

1. 在控制器方法中使用注释，例如

public String test(@UpperCase("foo") String foo)