run：过滤器的具体逻辑。可用很复杂，包括查sql，nosql去判断该请求到底有没有权限访问
3. yml配置 eureka: client: serviceUrl: defaultZone: :8761/eureka/ server: port: 8769 spring: application: name: service-zuul zuul: routes: api-a: path: /api-a/** serviceId: service-ribbon api-b: path: /api-b/** serviceId: service-feign 7. 链路中心 -Cloud Sleuth服务追踪组件zipkin，Spring Cloud Sleuth集成了zipkin组件 ,在spring Cloud为F版本的时候，已经不需要自己构建Zipkin Server了，只需要下载jar即可，下载地址：
https://dl.bintray.com/openzipkin/maven/io/zipkin/java/zipkin-server/
java -jar zipkin-server-2.10.1-exec.jar //http://localhost:9494
客户端
1. pom依赖 <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 "> <modelVersion>4.0.0</modelVersion> <groupId>com.forezp</groupId> <artifactId>sc-f-chapter1</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>pom</packaging> <name>sc-f-chapter1</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.3.RELEASE</version> <relativePath/> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> <spring-cloud.version>Finchley.RELEASE</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-sleuth</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-sleuth-zipkin</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project> 2. Application.java @SpringBootApplication @EnableEurekaClient @EnableDiscoveryClient @RestController @RefreshScope public class ConfigClientApplication { /** * :8881/actuator/bus-refresh */ public static void main(String[] args) { SpringApplication.run(ConfigClientApplication.class, args); } @Value("${foo}") String foo; @RequestMapping(value = "/hi") public String hi(){ return foo; } }@EnableZuulProxy，开启zuul的功能
3. 配置 server.port=8988 spring.zipkin.base-url=http://localhost:9411 spring.application.name=service-hi spring.zipkin.sender.type: web #设置采样率默认为 0.1 注意之前的版本是percentage 新版本中更换为 probability spring.sleuth.sampler.probability: 1 8. 断路器聚合监控(Hystrix Turbine)利用Hystrix Dashboard去监控断路器的Hystrix command。当我们有很多个服务的时候，这就需要聚合所以服务的Hystrix Dashboard的数据了。这就需要用到Spring Cloud的另一个组件了，即Hystrix Turbine
1. pom依赖 <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-hystrix</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-turbine</artifactId> </dependency> </dependencies> 2. Application.java @SpringBootApplication @EnableEurekaClient @EnableDiscoveryClient @RestController @EnableHystrix @EnableHystrixDashboard @EnableCircuitBreaker @EnableTurbine public class ServiceTurbineApplication { /** * :8764/turbine.stream */ public static void main(String[] args) { SpringApplication.run( ServiceTurbineApplication.class, args ); } }