springcloudgateway聚合swagger文档
需求背景
spring cloud搭建微服务系统,每个业务模块使用swagger开放文档接口查询,在业务网关模块提供swagger文档聚合查询接口,可以通过选择业务模块分类查看。
框架选型、版本及主要功能
- spring boot 2.1.6.RELEASE
- spring cloud Greenwich.SR3
- spring cloud gateway 2.1.3.RELEASE 网关组件
- knife4j 2.0.1 增强swagger ui样式,网关使用其starter依赖
- swagger bootstrap ui 1.9.6 增强swagger ui样式
- spring4all-swagger 1.9.0.RELEASE 配置化swagger参数,免去代码开发
模块职责划分
swagger组件
开发一个项目内的swagger-spring-boot-starter,整合swagger bootstrap ui 1.9.6和spring4all-swagger 1.9.0.RELEASE,对外提供@EnableSwagger注解服务
业务模块
引用自定义的swagger-spring-boot-starter,同时在配置文件中添加本模块的swagger基础信息配置。
网关模块
引用knife4j整合swagger,并开发filter、handler、config对多模块的swagger进行聚合
开发步骤示例
swagger组件
pom.xml文件依赖
<dependency> <groupId>com.github.xiaoymin</groupId>
<artifactId>swagger-bootstrap-ui</artifactId>
<version>1.9.6</version>
</dependency>
<dependency>
<groupId>com.spring4all</groupId>
<artifactId>swagger-spring-boot-starter</artifactId>
<version>1.9.0.RELEASE</version>
</dependency>
自定义注解
@Target({ElementType.TYPE})@Retention(RetentionPolicy.RUNTIME)
@Documented
@EnableSwagger2Doc
@EnableSwaggerBootstrapUI
@Import(SwaggerCommandLineRunner.class)
public @interface EnableSwagger {
}
注意@EnableSwagger2Doc,@EnableSwaggerBootstrapUI注解,@EnableSwagger2Doc注解能将swagger配置文档化,避免业务模块再开发swagger的代码,@EnableSwaggerBootstrapUI就是改进了swagger ui界面。
指定swagger的默认访问端口
@Slf4j@Component
public class SwaggerCommandLineRunner implements CommandLineRunner {
@Value("${server.port:8080}")
private String serverPort;
@Override
public void run(String... args) {
log.info("swagger url:http://localhost:" + serverPort + "/doc.html");
}
}
这样这个组件就集成完毕了,这个组件以多module的形式存在于项目公共组件中,使用maven引用即可。
业务模块开发
application中使用@EnableSwagger注解(自行开发的那个,不要搞错了)
@SpringBootApplication@EnableDiscoveryClient
@MapperScan("com.hy.demo.**.mapper")
@EnableSwagger
public class DemoApplication {
public static void main(String[] args) {
ConfigurableApplicationContext ctx = SpringApplication.run(DemoApplication.class, args);
ctx.start();
}
}
配置文件加上swagger信息:
swagger: enabled: true
title: hy demo
base-package: com.hy.demo
如此业务模块部分就完成了,非常简单,代码零侵入
网关开发
网关的开发是重头戏,里面需要集成knife4j(这个框架是swagger bootstrap ui的最终版本,最终版改了个名字,开发是同一个人),并且对请求url进行适配
pom.xml添加swagger的依赖
<dependency> <groupId>com.github.xiaoymin</groupId>
<artifactId>knife4j-spring-boot-starter</artifactId>
<version>2.0.1</version>
</dependency>
配置文件gateway部分,对业务接口配置和swagger配置要单独设置routes,例如:
spring: application:
name: gate
cloud:
gateway:
discovery:
locator:
#enabled: true0
enabled: false
lower-case-service-id: true
routes:
- id: demo
uri: lb://demo
predicates:
- Path=/api/json/hy/demo/**
- id: demoSwagger
uri: lb://demo
predicates:
- Path=/demo/**
filters:
- SwaggerHeaderFilter
- StripPrefix=1
我们假定业务转发的接口URL前缀定义:/api/json/hy/demo,demo为业务模块名称,业务接口对URL处理不需要加过滤器。
route id后缀为Swagger结尾,需要添加StripPrefix过滤器和自定义过滤器SwaggerHeaderFilter。
ResourceConfig开发,这个类的作用是从route信息里抽取业务模块信息,并且展示在swagger ui左上角的下拉框里
/** * 获取SwaggerResources列表信息,即业务模块列表
* 列表数据填充在swagger ui左上角的下拉框里
* @description:
* @author: demo
* @create: 2020-02-25 17:15
**/
@Slf4j
@Component
@Primary
@AllArgsConstructor
public class SwaggerResourceConfig implements SwaggerResourcesProvider {
private static final String SWAGGER_URI = "/v2/api-docs";
private final RouteLocator routeLocator;
private final GatewayProperties gatewayProperties;
@Override
public List<SwaggerResource> get() {
List<SwaggerResource> resources = new ArrayList<>();
List<String> routes = new ArrayList<>();
// 只抽取后缀为Swagger的路由信息
routeLocator.getRoutes().filter(r -> r.getId().endsWith("Swagger")).subscribe(route -> routes.add(route.getId()));
gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId())).forEach(route -> {
route.getPredicates().stream()
.filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
.forEach(predicateDefinition -> resources.add(swaggerResource(route.getId(),
predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
.replace("/**", SWAGGER_URI))));
});
return resources;
}
private SwaggerResource swaggerResource(String name, String location) {
log.info("name:{},location:{}",name,location);
SwaggerResource swaggerResource = new SwaggerResource();
swaggerResource.setName(name);
swaggerResource.setLocation(location);
swaggerResource.setSwaggerVersion("2.0");
return swaggerResource;
}
}
示例效果如下图:
【图一】
swagger ui静态资源的处理:
/** * @description:
* @author: demo
* @create: 2020-02-25 17:19
**/
@RestController
public class SwaggerHandler {
@Autowired(required = false)
private SecurityConfiguration securityConfiguration;
@Autowired(required = false)
private UiConfiguration uiConfiguration;
private final SwaggerResourcesProvider swaggerResources;
@Autowired
public SwaggerHandler(SwaggerResourcesProvider swaggerResources) {
this.swaggerResources = swaggerResources;
}
@GetMapping("/swagger-resources/configuration/security")
public Mono<ResponseEntity<SecurityConfiguration>> securityConfiguration() {
return Mono.just(new ResponseEntity<>(
Optional.ofNullable(securityConfiguration).orElse(SecurityConfigurationBuilder.builder().build()), HttpStatus.OK));
}
@GetMapping("/swagger-resources/configuration/ui")
public Mono<ResponseEntity<UiConfiguration>> uiConfiguration() {
return Mono.just(new ResponseEntity<>(
Optional.ofNullable(uiConfiguration).orElse(UiConfigurationBuilder.builder().build()), HttpStatus.OK));
}
@GetMapping("/swagger-resources")
public Mono<ResponseEntity> swaggerResources() {
return Mono.just((new ResponseEntity<>(swaggerResources.get(), HttpStatus.OK)));
}
}
swagger 过滤器示例代码
/** * @description:
* @author: demo
* @create: 2020-02-25 17:01
**/
@Component
public class SwaggerHeaderFilter extends AbstractGatewayFilterFactory {
private static final String HEADER_NAME = "X-Forwarded-Prefix";
private static final String SWAGGER_URI = "/v2/api-docs";
@Override
public GatewayFilter apply(Object config) {
return (exchange, chain) -> {
ServerHttpRequest request = exchange.getRequest();
String path = request.getURI().getPath();
if (!StringUtils.endsWithIgnoreCase(path,SWAGGER_URI)) {
return chain.filter(exchange);
}
String basePath = path.substring(0, path.lastIndexOf(SWAGGER_URI));
ServerHttpRequest newRequest = request.mutate().header(HEADER_NAME, basePath).build();
ServerWebExchange newExchange = exchange.mutate().request(newRequest).build();
return chain.filter(newExchange);
};
}
}
业务过滤器修改
由于该组件是业务网关组件,肯定会有通用的过滤器,来完成token校验,身份证识别等功能,记得在这些过滤器将"/v2/api-docs"的URL放行,示例代码:
if (StringUtils.endsWithIgnoreCase(path,"/v2/api-docs")) { return chain.filter(exchange);
}
测试验证
启动相应的注册中心、业务模块、网关模块进行验证,验证swagger文档、业务接口的处理能否同时满足。
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