添加swagger依赖springfox，添加knife4j依赖

<dependency><groupId>io.springfox</groupId><artifactId>springfox-boot-starter</artifactId>
</dependency>
<dependency><groupId>com.github.xiaoymin</groupId><artifactId>knife4j-spring-boot-starter</artifactId><version>3.0.2</version>
</dependency>
<dependency><groupId>com.github.xiaoymin</groupId><artifactId>knife4j-openapi3-spring-boot-starter</artifactId><version>4.0.0</version>
</dependency>

接口代码，文档空格使用全角格式的空格

import javax.validation.Valid;
import java.util.List;
import java.util.Set;import com.google.common.collect.Sets;
import io.swagger.annotations.ApiOperation;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;@Tag(name = "xx接口", description = "xxxxxController")
@RestController
@RequestMapping("/xx")
public class xxxxxController {@ApiOperation(tags = "xx接口", value = "xx",notes = "功能：xxxxx。  \n" +"业务逻辑：  \n" +"　xxxxx”。  \n" +"备注：  \n" +"　xxxxxx")@PostMapping(value = "/xxx/xx")public ResponseEntity<XXResponse> xxx(@RequestBody @Valid XXRequest xxRequest) {return ResponseEntity.status(HttpStatus.CREATED).body(xxService.xxx(xxRequest));}
}

使用knief访问
在接口代码中有接口描述，可以借助基于swagger的knife4j自动生成接口文档说明。

http://localhost:8080/xxx/doc.html#/home

支持MarkDown、html、word、openApi 4种格式的接口文档

也支持原有的swagger访问

http://localhost:8080/xxxx/swagger-ui/#/