在springboot中使用注解将值注入参数的操作

@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
public @interface InfoAnnotation {
 String value() default "userId";//默认获取userId的值
}

public class InfoResolver implements HandlerMethodArgumentResolver {
 //使用自定义的注解
 @Override
 public boolean supportsParameter(MethodParameter methodParameter) {
 return methodParameter.hasParameterAnnotation(InfoAnnotation.class);
 }

 //将值注入参数
 @Override
 public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer, NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory) throws Exception {
 //获取捕获到的注解
 InfoAnnotation annotation = methodParameter.getParameterAnnotation(InfoAnnotation.class);
 String value = annotation.value();
 //获取需要注入值得逻辑
 //该例子在shiro中获取userId或者用户信息
 if (value == null || "".equalsIgnoreCase(value) || value.equalsIgnoreCase("userId")){
  User user = (User)SecurityUtils.getSubject().getSession().getAttribute("user");
  if (user == null){
  return 1;
  }
  return user.getId();
 } else if ("user".equalsIgnoreCase(value)){
  return SecurityUtils.getSubject().getSession().getAttribute("user");
 }
 return value;
 }
}

@SpringBootApplication
public class DemoApplication extends WebMvcConfigurationSupport {
 public static void main(String[] args) {
 SpringApplication.run(DemoApplication.class, args);
 }
 //添加自定义的拦截器
 @Override
 public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers){
 super.addArgumentResolvers(argumentResolvers);
 argumentResolvers.add(new InfoResolver());
 }
}

@GetMapping
public BaseResponse<?> test(@InfoAnnotation int userId){
 return ResponseUtil.successResponse(userId);
}