【Swagger】SpringBoot整合Swagger

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一、搭建Swagger组件

1. 引入Swagger

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

2. 添加Swagger配置文件

@Configuration
@EnableWebMvc
public class SwaggerConfig {Boolean swaggerEnabled=true;@Beanpublic Docket createRestApi() {return new Docket(DocumentationType.OAS_30).apiInfo(apiInfo())// 是否开启.enable(swaggerEnabled).select()// 扫描的路径包.apis(RequestHandlerSelectors.basePackage("com.king.springbootdemo"))// 指定路径处理PathSelectors.any()代表所有的路径.paths(PathSelectors.any()).build().pathMapping("/");}private ApiInfo apiInfo() {return new ApiInfoBuilder().title("SpringBoot-Swagger3集成和使用-demo示例").description("springboot | swagger")// 作者信息.contact(new Contact("King", "", "")).version("1.0.0").build();}
}

3. 创建一个Controller

@RestController
@Api(value = "desc of class")
public class DemoController {@GetMapping("/demo")@ApiOperation(value = "第一个接口demo", notes = "")public String demo() {return "hello demo !!";}@GetMapping("/test")@ApiOperation(value = "第二个接口test", notes = "")public String test(@ApiParam(value = "姓名",required=true) @RequestParam String name) {return "hello :" + name;}
}

4. SpringBoot启动类添加加载配置

@EnableOpenApi

5. 配置完成后Swagger界面

路径：http://localhost:8080/swagger-ui/index.html

6. 使用更美观第三方UI

• 引入第三方pom配置
  PS：swagger-bootstrap-ui 作者已经暂停更新，可以使用 knife4j-spring-ui 。

<dependency><groupId>com.github.xiaoymin</groupId><artifactId>swagger-bootstrap-ui</artifactId><version>1.9.6</version>
</dependency>

• 使用自定义配置，需要将原来的 @EnableWebMvc 去掉

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {@Overridepublic void addCorsMappings(CorsRegistry registry) {registry.addMapping("/**").allowedOriginPatterns("*").allowedMethods("PUT", "DELETE", "GET", "POST", "OPTIONS").allowCredentials(true).maxAge(3600);}@Overridepublic void addResourceHandlers(ResourceHandlerRegistry registry) {registry.addResourceHandler("doc.html").addResourceLocations("classpath:/META-INF/resources/");registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");}
}

• 第三方使用界面，http://localhost:8080/doc.html
  

二、搭建过程出现异常

1. 引入Swagger启动报错，Failed to start bean ‘documentationPluginsBootstrapper’; nested exception is java.lang.NullPointerException

两种解决方案：

1. 添加注解配置，@EnableWebMvc
2. 配置文件增加配置，spring.mvc.pathmatch.matching-strategy=ant_path_matcher

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-02-09 15:38:15.961 ERROR 13208 --- [           main] o.s.boot.SpringApplication               : Application run failedorg.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerExceptionat org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181) ~[spring-context-5.3.15.jar:5.3.15]at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54) ~[spring-context-5.3.15.jar:5.3.15]at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356) ~[spring-context-5.3.15.jar:5.3.15]at java.lang.Iterable.forEach(Iterable.java:75) ~[na:1.8.0_77]at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155) ~[spring-context-5.3.15.jar:5.3.15]at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123) ~[spring-context-5.3.15.jar:5.3.15]at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935) ~[spring-context-5.3.15.jar:5.3.15]at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586) ~[spring-context-5.3.15.jar:5.3.15]at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.6.3.jar:2.6.3]at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:732) [spring-boot-2.6.3.jar:2.6.3]at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:414) [spring-boot-2.6.3.jar:2.6.3]at org.springframework.boot.SpringApplication.run(SpringApplication.java:302) [spring-boot-2.6.3.jar:2.6.3]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303) [spring-boot-2.6.3.jar:2.6.3]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292) [spring-boot-2.6.3.jar:2.6.3]at com.king.springbootdemo.SpringbootDemoApplication.main(SpringbootDemoApplication.java:12) [classes/:na]
Caused by: java.lang.NullPointerException: nullat springfox.documentation.spring.web.WebMvcPatternsRequestConditionWrapper.getPatterns(WebMvcPatternsRequestConditionWrapper.java:56) ~[springfox-spring-webmvc-3.0.0.jar:3.0.0]at springfox.documentation.RequestHandler.sortedPaths(RequestHandler.java:113) ~[springfox-core-3.0.0.jar:3.0.0]at springfox.documentation.spi.service.contexts.Orderings.lambda$byPatternsCondition$3(Orderings.java:89) ~[springfox-spi-3.0.0.jar:3.0.0]at java.util.Comparator.lambda$comparing$77a9974f$1(Comparator.java:469) ~[na:1.8.0_77]at java.util.TimSort.countRunAndMakeAscending(TimSort.java:355) ~[na:1.8.0_77]at java.util.TimSort.sort(TimSort.java:220) ~[na:1.8.0_77]at java.util.Arrays.sort(Arrays.java:1512) ~[na:1.8.0_77]

感谢阅读，下次再见。ヾ(￣▽￣)Bye_Bye！

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