Spring Boot项目集成Knife4j接口文档的实例代码

时间：2022-10-12 10:04:42|栏目：JAVA代码|点击：次

1、在pom.xml引入依赖包

<!-- Swagger配置依赖knife4j -->
<dependency>
    <groupId>com.github.xiaoymin</groupId>
    <artifactId>knife4j-spring-boot-starter</artifactId>
    <version>2.0.9</version>
</dependency>

2、创建Knife4j配置文件

package com.yuyun.config;

import io.swagger.annotations.ApiOperation;
import io.swagger.models.auth.In;
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.service.ApiKey;
import springfox.documentation.service.Contact;
import springfox.documentation.service.SecurityScheme;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2WebMvc;

import java.util.ArrayList;
import java.util.List;

/**
 * @author hyh
 */
@Configuration
@EnableSwagger2WebMvc
public class Knife4jConfiguration {

    @Bean(value = "defaultApi2")
    public Docket defaultApi2() {

        Docket docket = new Docket(DocumentationType.SWAGGER_2)
                // 是否启用Swagger
                .enable(true)
                //分组名称
                .groupName("1.0版本")
                // 用来创建该API的基本信息，展示在文档的页面中（自定义展示的信息）
                .apiInfo(apiInfo())
                // 设置哪些接口暴露给Swagger展示
                .select()
                // 扫描所有有注解的api，用这种方式更灵活
                .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
                //指定Controller扫描包路径
//                .apis(RequestHandlerSelectors.basePackage("com.yuyun.controller"))
                // 扫描所有
//                .apis(RequestHandlerSelectors.any())
                .build();
        return docket;
    }

    private ApiInfo apiInfo() {

        String name = "雨云";
        String url = "https://www.xxx.com/";
        String email = "1873591403@qq.com";

        Contact contact = new Contact(name, url, email);

        return new ApiInfoBuilder()
                .title("API接口文档")
                .description("API接口文档描述")
                .termsOfServiceUrl("https://www.xx.com/")
                .contact(contact)
                .version("1.0.1")
                .build();
    }
}

注意：如果出现错误Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException

是因为SpringBoot版本高了，将版本降下去或者在application.yml添加如下内容即可解决该错误

spring: 
  mvc:
    pathmatch:
      matching-strategy: ant_path_matcher

项目运行后，访问ip+端口号+/doc.html，比如http://localhost:8110/doc.html。效果如图

3、使用Knife4j注解

（1）在实体类中使用

@ApiModel 放在在响应实体类上，用于描述该类

@ApiModelProperty 描述该响应类的属性

/**
 * 企业信息表
 *
 * @author  
 * @since 1.0.0 2021-12-17
 */
@Data
@ApiModel(value = "企业信息表")
@TableName("company")
public class CompanyDTO implements Serializable {
    private static final long serialVersionUID = 1L;

	/**
	 * 主键
	 */
	@ApiModelProperty(value = "主键")
	private Long id;

	/**
	 * 企业名称
	 */
	@ApiModelProperty(value = "企业名称")
	private String companyName;

	/**
	 * 简介
	 */
	@ApiModelProperty(value = "简介")
	private String description;
}

（2）在Controller层使用

@RestController
@RequestMapping("company")
@Api(tags = "企业信息表")
public class CompanyController {
    @Autowired
    private CompanyService companyService;

    @GetMapping("getList")
    @ApiOperation("根据条件获取数据")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "id", value = "id", paramType = "query", required = true, dataType = "String"),
            @ApiImplicitParam(name = "name", value = "名称", paramType = "query", required = true, dataType = "String")
    })
    public Result<List<CompanyDTO>> getList(@ApiParam(name = "address", value = "地址", required = true)  String address) {
        List<CompanyDTO> companyList = companyService.list();

        return new Result<List<CompanyDTO>>().success(companyList);
    }
}

还有其他一些注解，用到再了解

4、全局参数

在实际项目中访问接口都添加了权限，每次访问都要带一个请求头参数token。全局参数就是为了方便传一个固定的参数。当添加全局参数后，所有的接口都会带上该参数。

第一种

在配置文件中加入

private List<SecurityScheme> securitySchemes() {
    List<SecurityScheme> apiKeyList = new ArrayList<SecurityScheme>();
    apiKeyList.add(new ApiKey("Authorization", "Authorization", In.HEADER.toValue()));
    return apiKeyList;
}

在defaultApi2()方法内引用

.securitySchemes(securitySchemes())

最后配置文件中的内容：

@Configuration
@EnableSwagger2WebMvc
public class Knife4jConfiguration {

    @Bean(value = "defaultApi2")
    public Docket defaultApi2() {

        Docket docket = new Docket(DocumentationType.SWAGGER_2)
                // 是否启用Swagger
                .enable(true)
                //分组名称
                .groupName("1.0版本")
                // 用来创建该API的基本信息，展示在文档的页面中（自定义展示的信息）
                .apiInfo(apiInfo())
                // 设置哪些接口暴露给Swagger展示
                .select()
                // 扫描所有有注解的api，用这种方式更灵活
                .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
                //指定Controller扫描包路径
//                .apis(RequestHandlerSelectors.basePackage("com.yuyun.controller"))
                // 扫描所有
//                .apis(RequestHandlerSelectors.any())
                .paths(PathSelectors.any())
                .build()
                /* 设置安全模式，swagger可以设置访问token */
                .securitySchemes(securitySchemes())
                .securityContexts(securityContexts())
                .pathMapping("/");
        return docket;
    }

    private ApiInfo apiInfo() {

        String name = "雨云";
        String url = "https://www.xxx.com/";
        String email = "1873591403@qq.com";

        Contact contact = new Contact(name, url, email);

        return new ApiInfoBuilder()
                .title("API接口文档")
                .description("API接口文档描述")
                .termsOfServiceUrl("https://www.xx.com/")
                .contact(contact)
                .version("1.0.1")
                .build();
    }

    /**
     * 安全模式，这里指定token通过Authorization头请求头传递
     */
    private List<SecurityScheme> securitySchemes() {
        List<SecurityScheme> apiKeyList = new ArrayList<SecurityScheme>();
        apiKeyList.add(new ApiKey("Authorization", "Authorization", "header"));
        return apiKeyList;
    }

    /**
     * 安全上下文
     */
    private List<SecurityContext> securityContexts() {
        List<SecurityContext> securityContexts = new ArrayList<>();
        securityContexts.add(
                SecurityContext.builder()
                        .securityReferences(defaultAuth())
                        .build());
        return securityContexts;
    }

    /**
     * 默认的安全上引用
     */
    private List<SecurityReference> defaultAuth() {
        AuthorizationScope authorizationScope = new AuthorizationScope("global", "accessEverything");
        AuthorizationScope[] authorizationScopes = new AuthorizationScope[1];
        authorizationScopes[0] = authorizationScope;
        List<SecurityReference> securityReferences = new ArrayList<>();
        securityReferences.add(new SecurityReference("Authorization", authorizationScopes));
        return securityReferences;
    }

}

效果：菜单上多了一个Authorize，在参数值中添加上信息