添加了缺少的配置注解

src/main/java/com/smart/reader/config/Knife4jConfig.java

@@ -1,6 +1,7 @@
 package com.smart.reader.config;
 
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import springfox.documentation.builders.ApiInfoBuilder;
 import springfox.documentation.builders.PathSelectors;
 import springfox.documentation.builders.RequestHandlerSelectors;
@@ -8,7 +9,7 @@ import springfox.documentation.service.ApiInfo;
 import springfox.documentation.service.Contact;
 import springfox.documentation.spi.DocumentationType;
 import springfox.documentation.spring.web.plugins.Docket;
-
+@Configuration
 public class Knife4jConfig {
     @Bean
     Docket docket(){