一、引入依赖

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.9.2</version>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.9.2</version>
</dependency>

二、编写配置类

@Configuration
@EnableSwagger2 // 开启Swagger2自动配置
public class Swagger2Config {
    
    @Bean
    public Docket UserApiConfig(){
        return new Docket(DocumentationType.SWAGGER_2)
                .groupName("UserApi") // 分组
                .apiInfo(UserApiInfo())
                .select()
                .apis(RequestHandlerSelectors.basePackage("cn.ken.login.controller"))
                .paths(PathSelectors.ant("/user/**"))
                .build();
    }

    @Bean
    public Docket BlogApiConfig(){
        return new Docket(DocumentationType.SWAGGER_2)
                .groupName("BlogApi") // 分组
                .apiInfo(BlogApiInfo())
                .select()
                .apis(RequestHandlerSelectors.basePackage("cn.ken.login.controller"))
                .paths(PathSelectors.ant("/blog/**"))
                .build();
    }

    // 配置用户文档信息
    private ApiInfo UserApiInfo(){
        return new ApiInfoBuilder()
                .title("我的API文档") // 标题
                .description("本文档描述了用户相关的接口定义") // 描述
                .version("1.0") // 版本
                .contact(new Contact("联系人名字", "联系人访问链接", "联系人邮箱")) // 联系人信息
                .build();
    }
    
    // 配置博客文档信息
    private ApiInfo BlogApiInfo(){
        return new ApiInfoBuilder()
                .title("我的API文档") // 标题
                .description("本文档描述了博客相关的接口定义") // 描述
                .version("1.0") // 版本
                .contact(new Contact("联系人名字", "联系人访问链接", "联系人邮箱")) // 联系人信息
                .build();
    }

}

三、测试

使用注解对接口进行描述(也可以省略)

访问http://localhost:8080/swagger-ui.html

四、坑点

1、运行报错

Caused by: java.lang.NullPointerException: null
	at springfox.documentation.spi.service.contexts.Orderings$8.compare(Orderings.java:112) ~[springfox-spi-2.9.2.jar:null]
	at springfox.documentation.spi.service.contexts.Orderings$8.compare(Orderings.java:109) ~[springfox-spi-2.9.2.jar:null]
	at com.google.common.collect.ComparatorOrdering.compare(ComparatorOrdering.java:37) ~[guava-20.0.jar:na]
	at java.util.TimSort.countRunAndMakeAscending(TimSort.java:351) ~[na:1.8.0_05]
	at java.util.TimSort.sort(TimSort.java:216) ~[na:1.8.0_05]
	at java.util.Arrays.sort(Arrays.java:1435) ~[na:1.8.0_05]
	at com.google.common.collect.Ordering.sortedCopy(Ordering.java:855) ~[guava-20.0.jar:na]
	at springfox.documentation.spring.web.plugins.WebMvcRequestHandlerProvider.requestHandlers(WebMvcRequestHandlerProvider.java:57) ~[springfox-spring-web-2.9.2.jar:null]
	at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper$2.apply(DocumentationPluginsBootstrapper.java:138) ~[springfox-spring-web-2.9.2.jar:null]
	at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper$2.apply(DocumentationPluginsBootstrapper.java:135) ~[springfox-spring-web-2.9.2.jar:null]
	at com.google.common.collect.Iterators$7.transform(Iterators.java:750) ~[guava-20.0.jar:na]
	at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:47) ~[guava-20.0.jar:na]
	at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:47) ~[guava-20.0.jar:na]
	at com.google.common.collect.MultitransformedIterator.hasNext(MultitransformedIterator.java:52) ~[guava-20.0.jar:na]
	at com.google.common.collect.MultitransformedIterator.hasNext(MultitransformedIterator.java:50) ~[guava-20.0.jar:na]
	at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:249) ~[guava-20.0.jar:na]
	at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:209) ~[guava-20.0.jar:na]
	at com.google.common.collect.FluentIterable.toList(FluentIterable.java:614) ~[guava-20.0.jar:na]
	at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.defaultContextBuilder(DocumentationPluginsBootstrapper.java:111) ~[springfox-spring-web-2.9.2.jar:null]
	at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.buildContext(DocumentationPluginsBootstrapper.java:96) ~[springfox-spring-web-2.9.2.jar:null]
	at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.start(DocumentationPluginsBootstrapper.java:167) ~[springfox-spring-web-2.9.2.jar:null]
	at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178) ~[spring-context-5.3.16.jar:5.3.16]
	... 15 common frames omitted

原因:

Spring Boot 2.6及 更高版本使用的是PathPatternMatcher,而Springfox使用的路径匹配是基于AntPathMatcher的,所以更改配置如下:

spring:
  mvc:
    pathmatch:
      matching-strategy: ANT_PATH_MATCHER

2、访问页面404

  • @EnableWebMvc注解的问题,加了这个注解以后会导致静态资源路径无法访问

  • 继承了WebMvcConfigurationSupport,配置文件在中配置的相关内容会失效,需要重新指定静态资源

@EnableWebMvc注解(相当于继承WebMvcConfigurationSupport)和extends WebMvcConfigurationSupport导致404的原因都是因为同时有多个配置类实现了WebMvcConfigurer或继承了WebMvcConfigurationSupport的话,只会有一个生效,即以上两种情况导致了默认的WebMvcAutoConfiguration自动配置失效,故找不到静态资源。解决办法是,保持一个配置类,将配置都在一个类中设置。

解决方法:

在一个统一的WebConfig中实现WebMvcConfigurer,并重写其中的public void addResourceHandlers(ResourceHandlerRegistry registry)方法,重新指定swagger静态资源,如下:

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
	registry.addResourceHandler("/**").addResourceLocations("classpath:/static/");
	registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/");
	registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
}

3、页面被拦截器拦截

放行该页面,如下:

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new JWTInterceptor())
                .excludePathPatterns("user/login")
                .excludePathPatterns("user/register")
                .excludePathPatterns("/swagger-resources/**")
                .excludePathPatterns("/swagger-ui.html/**")
                .excludePathPatterns("/webjars/**");
    }
}
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