项目场景：

springboot项目中同时使用接口文档swagger和knife4j

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问题描述

在实体类中设置了字段必填的属性，在访问接口文档时出现异常

实体类关键代码片段

/**
 * 部门表 sys_dept
 */
public class SysDept extends BaseEntity
{
    private static final long serialVersionUID = 1L;

    /** 部门ID */
    private Long deptId;

    /** 部门名称 */
    private String deptName;

    /** 显示顺序 */
    private Integer orderNum;

    @NotBlank(message = "部门名称不能为空")
    @Size(min = 0, max = 30, message = "部门名称长度不能超过30个字符")
    public String getDeptName()
    {
        return deptName;
    }

    public void setDeptName(String deptName)
    {
        this.deptName = deptName;
    }

    @NotNull(message = "显示顺序不能为空")
    public Integer getOrderNum()
    {
        return orderNum;
    }

    public void setOrderNum(Integer orderNum)
    {
        this.orderNum = orderNum;
    }
}

异常描述：

（1）没有加入knife4j配置，仅使用swagger配置

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>3.0.0</version>
        </dependency>

package com.pie.common.swagger.config;

@Configuration
@EnableSwagger2
@EnableAutoConfiguration
@ConditionalOnProperty(name = "swagger.enabled", matchIfMissing = true)
public class SwaggerAutoConfiguration
{
    /**
     * 默认的排除路径，排除Spring Boot默认的错误处理路径和端点
     */
    private static final List<String> DEFAULT_EXCLUDE_PATH = Arrays.asList("/error", "/actuator/**");

    private static final String BASE_PATH = "/**";

    @Bean
    @ConditionalOnMissingBean
    public SwaggerProperties swaggerProperties()
    {
        return new SwaggerProperties();
    }

    @Bean
    public Docket api(SwaggerProperties swaggerProperties)
    {
        // base-path处理
        if (swaggerProperties.getBasePath().isEmpty())
        {
            swaggerProperties.getBasePath().add(BASE_PATH);
        }
        // noinspection unchecked
        List<Predicate<String>> basePath = new ArrayList<Predicate<String>>();
        swaggerProperties.getBasePath().forEach(path -> basePath.add(PathSelectors.ant(path)));

        // exclude-path处理
        if (swaggerProperties.getExcludePath().isEmpty())
        {
            swaggerProperties.getExcludePath().addAll(DEFAULT_EXCLUDE_PATH);
        }

        List<Predicate<String>> excludePath = new ArrayList<>();
        swaggerProperties.getExcludePath().forEach(path -> excludePath.add(PathSelectors.ant(path)));

        ApiSelectorBuilder builder = new Docket(DocumentationType.SWAGGER_2).host(swaggerProperties.getHost())
                .apiInfo(apiInfo(swaggerProperties)).select()
                .apis(RequestHandlerSelectors.basePackage(swaggerProperties.getBasePackage()));

        swaggerProperties.getBasePath().forEach(p -> builder.paths(PathSelectors.ant(p)));
        swaggerProperties.getExcludePath().forEach(p -> builder.paths(PathSelectors.ant(p).negate()));

        return builder.build().securitySchemes(securitySchemes()).securityContexts(securityContexts()).pathMapping("/");
    }

    /**
     * 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())
                        .operationSelector(o -> o.requestMappingPattern().matches("/.*"))
                        .build());
        return securityContexts;
    }

    /**
     * 默认的全局鉴权策略
     *
     * @return
     */
    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;
    }

    private ApiInfo apiInfo(SwaggerProperties swaggerProperties)
    {
        return new ApiInfoBuilder()
                .title(swaggerProperties.getTitle())
                .description(swaggerProperties.getDescription())
                .license(swaggerProperties.getLicense())
                .licenseUrl(swaggerProperties.getLicenseUrl())
                .termsOfServiceUrl(swaggerProperties.getTermsOfServiceUrl())
                .contact(new Contact(swaggerProperties.getContact().getName(), swaggerProperties.getContact().getUrl(), swaggerProperties.getContact().getEmail()))
                .version(swaggerProperties.getVersion())
                .build();
    }
}

在查询接口以上两个字段deptName和orderNum不会被识别成必填字段

（2）在以上基础加入knife4j依赖

<!-- knife4j-->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>knife4j-spring-boot-starter</artifactId>
            <version>3.0.2</version>
        </dependency>

在查询接口以上两个字段deptName和orderNum会被识别成必填字段。

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原因分析：

应该是swagger对注解@NotBlank(message = "部门名称不能为空")没有生效。

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解决方案：

目前还不知道为什么swagger没有对注解生效，也没有验证这个必填问题是否对前端接口调用有影响，期待大佬的解疑！！！