一、 pom.xml

knife4j和springboot之间存在版本不兼容的问题，需要选对合适的版本

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.sht</groupId><artifactId>test</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>test</name><url>http://maven.apache.org</url><properties><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.3.6.RELEASE</version></parent><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency><!-- springboot 依赖 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><exclusions><exclusion><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-logging</artifactId></exclusion></exclusions></dependency><!-- spring security --><!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId></dependency><!-- 日志 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-log4j2</artifactId></dependency><!-- mybatis数据库支持 --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.2</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!-- 调试支持 --><dependency><groupId>com.github.xiaoymin</groupId><artifactId>knife4j-spring-boot-starter</artifactId><version>2.0.8</version></dependency><!-- lombok --><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.12</version></dependency><!-- jwt --><!-- <dependency> <groupId>com.auth0</groupId> <artifactId>java-jwt</artifactId> <version>3.4.0</version> </dependency> --><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.4</version></dependency></dependencies>
</project>

二、 App.java

app.java

package com.sht.test;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class App 
{public static void main( String[] args ){SpringApplication.run(App.class, args);}
}

三、 Controller

HelloController.java

package com.sht.test.controller;import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;import org.apache.commons.io.IOUtils;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;@RestController
@Api(value = "文件上传",tags = "文件上传")
public class HelloController {//文件上传@PostMapping("/file/upload")@ApiImplicitParams({@ApiImplicitParam(name = "name", value = "文件名"),@ApiImplicitParam(name = "file", value = "文件内容")})public String upload(@RequestParam(value = "name") String name,@RequestParam(value = "file") MultipartFile file) {try {File diskFile = new File("D:\\myfile\\project\\ttt\\oxygen\\test\\data\\" + name);if (!diskFile.exists()) {diskFile.createNewFile();}InputStream is = file.getInputStream();OutputStream os = new FileOutputStream(diskFile);IOUtils.copy(is, os);} catch (Exception e) {e.printStackTrace();}return "success";}
}

四、 Knife4j配置

Knife4jConfig.java

package com.sht.test.config;import java.util.ArrayList;
import java.util.List;import org.springframework.boot.SpringBootConfiguration;
import org.springframework.context.annotation.Bean;import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.ParameterBuilder;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.schema.ModelRef;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.service.Parameter;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2WebMvc;@SpringBootConfiguration
@EnableSwagger2WebMvc
public class Knife4jConfig {@Beanpublic Docket adminApiConfig(){List<Parameter> pars = new ArrayList<>();ParameterBuilder tokenPar = new ParameterBuilder();tokenPar.name("token").description("用户token").defaultValue("").modelRef(new ModelRef("string")).parameterType("header").required(false).build();pars.add(tokenPar.build());//添加head参数endDocket adminApi = new Docket(DocumentationType.SWAGGER_2).groupName("adminApi").apiInfo(adminApiInfo()).select().apis(RequestHandlerSelectors.basePackage("com.sht.test")).build().globalOperationParameters(pars);return adminApi;}private ApiInfo adminApiInfo(){return new ApiInfoBuilder().title("测试-API文档").description("测试").version("1.0").contact(new Contact("张三", "", "xxxxxxx")).build();}
}

五、 测试截图