knife4j是为Java MVC框架集成Swagger生成Api文档的增强解决方案,前身是swagger-bootstrap-ui,取名kni4j是希望它能像一把匕首一样小巧,轻量,并且功能强悍!

官网地址：

Knife4j · 集Swagger2及OpenAPI3为一体的增强解决方案. | Knife4j

本文以Springboot3+版本集成knife4j叙述(请注意版本差别，不同版本写法不同)。

第一步：创建Spring Boot项目并且在pom.xml中引入Knife4j的依赖包，代码如下：

<dependency><groupId>com.github.xiaoymin</groupId><artifactId>knife4j-openapi3-jakarta-spring-boot-starter</artifactId><version>4.4.0</version>
</dependency>
<dependency><groupId>io.springfox</groupId><artifactId>springfox-spring-web</artifactId><version>3.0.0</version>
</dependency>

第二步：创建Swagger配置依赖，代码如下：

package blog.web.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;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;@Configuration
public class Knife4jConfiguration {@Beanpublic Docket docketAdmin() {System.out.println("swagger 准备生成接口文档...");ApiInfo apiInfo = new ApiInfoBuilder().title("清山博客文档").version("2.0").description("清山博客项目接口文档").build();return new Docket(DocumentationType.SWAGGER_2).groupName("管理端接口").apiInfo(apiInfo).select()//  指定swagger需要扫描的包.apis(RequestHandlerSelectors.basePackage("blog.web")).paths(PathSelectors.any()).build();}
}

第三步:新建一个接口Controller类，如下：

@RestController
@RequestMapping("body")
@Tag(name = "body参数")
public class BodyController {@Operation(summary = "普通body请求")@PostMapping("/body")public ResponseEntity<FileResp> body(@RequestBody FileResp fileResp){return ResponseEntity.ok(fileResp);}@Operation(summary = "普通body请求+Param+Header+Path")@Parameters({@Parameter(name = "id",description = "文件id",in = ParameterIn.PATH),@Parameter(name = "token",description = "请求token",required = true,in = ParameterIn.HEADER),@Parameter(name = "name",description = "文件名称",required = true,in=ParameterIn.QUERY)})@PostMapping("/bodyParamHeaderPath/{id}")public ResponseEntity<FileResp> bodyParamHeaderPath(@PathVariable("id") String id,@RequestHeader("token") String token, @RequestParam("name")String name,@RequestBody FileResp fileResp){fileResp.setName(fileResp.getName()+",receiveName:"+name+",token:"+token+",pathID:"+id);return ResponseEntity.ok(fileResp);}
}

注意事项：

1.Spring Boot 3 只支持OpenAPI3规范
2.Knife4j提供的starter已经引用springdoc-openapi的jar，开发者需注意避免jar包冲突
3.JDK版本必须 >= 17

参考：

快速开始 | Knife4j