CAP定理指的是在一个分布式系统中，Consistency（一致性）、 Availability（可用性）、Partition tolerance（分区容错性），三者不可兼得。
一致性（C）：分布式系统中多个主机之间是否能够保持数据一致的特性。即，当系统数据发生更新操作后，各个主机中的数据仍然处于一致的状态。
可用性（A）：系统提供的服务必须一直处于可用的状态，即对于用户的每一个请求，系统总是可以在有限的时间内对用户做出响应。
分区容错性（P）：分布式系统在遇到任何网络分区故障时，仍能够保证对外提供满足一致性和可用性的服务。
<properties >
<java .version>1.8</java .version>
<spring-cloud .version>Hoxton.SR11</spring-cloud .version>
<spring-boot-cloud .version>2.2.8.RELEASE</spring-boot-cloud .version>
<spring-boot-revision >2.3.2.RELEASE</spring-boot-revision >
</properties >
<dependencies >
<!-- 若你使用的是JDK6、7、8，那么这些依赖无需导入。而JDK9及其以上版本需要导入。 JAXB,Java Architecture for XML Binding,XML绑定的Java技术。其可以根据
XML Schema生成Java类。
-->
<!-- <dependency>--> <!-- <groupId>javax.xml.bind</groupId>--> <!-- <artifactId>jaxb-api</artifactId>--> <!-- <version>2.2.11</version>--> <!-- </dependency>--> <!-- <dependency>--> <!-- <groupId>com.sun.xml.bind</groupId>--> <!-- <artifactId>jaxb-core</artifactId>--> <!-- <version>2.2.11</version>--> <!-- </dependency>--> <!-- <dependency>--> <!-- <groupId>com.sun.xml.bind</groupId>--> <!-- <artifactId>jaxb-impl</artifactId>--> <!-- <version>2.2.11</version>--> <!-- </dependency>--> <!-- <dependency>--> <!-- <groupId>javax.activation</groupId>--> <!-- <artifactId>activation</artifactId>--> <!-- <version>1.1.1</version>--> <!-- </dependency>--> dependency >
<groupId >org.springframework.cloud</groupId >
<artifactId >spring-cloud-starter-netflix-eureka-server</artifactId >
<version >${spring-boot-revision}</version >
</dependency >
<dependency >
<groupId >org.springframework.boot</groupId >
<artifactId >spring-boot-starter-web</artifactId >
<version >${spring-boot-revision}</version >
</dependency >
<dependency >
<groupId >org.springframework.boot</groupId >
<artifactId >spring-boot-starter-test</artifactId >
<version >${spring-boot-revision}</version >
<scope >test</scope >
<exclusions >
<exclusion >
<groupId >org.junit.vintage</groupId >
<artifactId >junit-vintage-engine</artifactId >
</exclusion >
</exclusions >
</dependency >
<!-- --> dependency >
<groupId >com.google.code.gson</groupId >
<artifactId >gson</artifactId >
<version >2.6.2</version >
</dependency >
</dependencies >
<dependencyManagement >
<dependencies >
<dependency >
<groupId >org.springframework.cloud</groupId >
<artifactId >spring-cloud-dependencies</artifactId >
<version >${spring-cloud.version}</version >
<type >pom</type >
<scope >import</scope >
</dependency >
</dependencies >
</dependencyManagement > server :
port : 8000 # eureka端口eureka :
instance :
hostname : localhost
client :
register-with-eureka : false # 指定当前主机是否需要向Eureka Server注册自己fetch-registry : false # 指定当前主机是否需要从Eureka Server下载服务注册表service-url :
# 当前Eureka Server对外暴露的服务地址# defaultZone: http://${eureka.instance.hostname}:${server.port}/eurekadefaultZone : http://localhost:8000/eureka
server :
# 关闭自我保护机制enable-self-preservation : false
# 指定自我保护机制的开启阈值# renewal-percent-threshold: 0.75# 设置server端剔除不可用服务的时间窗，单位毫秒eviction-interval-timer-in-ms : 4000 server :
port : 8100
eureka :
client :
register-with-eureka : false
fetch-registry : false
service-url :
defaultZone : http://eureka8100.com:8100/eureka,http://eureka8200.com:8200/eureka,http://eureka8300.com:8300/eureka
instance :
hostname : eureka8100.com @EnableEurekaServer // 开启Eureka服务
找到jar包：
META-INF/spring.factories:
org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration
org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration.eurekaServerBootstrap
org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration.peerAwareInstanceRegistry
服务注册、状态修改等
com.netflix.eureka.registry.AbstractInstanceRegistry.register
com.netflix.eureka.registry.PeerAwareInstanceRegistryImpl.replicateToPeers
com.netflix.eureka.registry.PeerAwareInstanceRegistryImpl.replicateInstanceActionsToPeers
com.netflix.eureka.cluster.PeerEurekaNode.statusUpdate(java.lang.String, java.lang.String, com.netflix.appinfo.InstanceInfo.InstanceStatus, com.netflix.appinfo.InstanceInfo)
com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.statusUpdate
org.springframework.cloud.netflix.eureka.server.InstanceRegistry
com.netflix.eureka.resources.InstanceResource （对服务操作的类：注册，下架等）
@EnableEurekaClient // 注册中心可以是任意的类型
找到jar 包；
META-INF/spring.factories:
org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration
org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration.EurekaClientConfiguration
org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration.EurekaClientConfiguration.eurekaClient
com.netflix.discovery.DiscoveryClient.DiscoveryClient(com.netflix.appinfo.ApplicationInfoManager, com.netflix.discovery.EurekaClientConfig, com.netflix.discovery.AbstractDiscoveryClientOptionalArgs)
com.netflix.discovery.DiscoveryClient.DiscoveryClient(com.netflix.appinfo.ApplicationInfoManager, com.netflix.discovery.EurekaClientConfig, com.netflix.discovery.AbstractDiscoveryClientOptionalArgs, javax.inject.Provider<com.netflix.discovery.BackupRegistry>, com.netflix.discovery.shared.resolver.EndpointRandomizer)
启动定时任务： com.netflix.discovery.DiscoveryClient.initScheduledTasks
1、@Inject是JSR330 (Dependency Injection for Java)中的规范，需要导入javax.inject.Inject;实现注入。
2、@Inject是根据类型进行自动装配的，如果需要按名称进行装配，则需要配合@Named；
3、@Inject可以作用在变量、setter方法、构造函数上。
<properties >
<java .version>1.8</java .version>
<spring-cloud .version>Hoxton.SR11</spring-cloud .version>
<spring-boot-cloud .version>2.2.8.RELEASE</spring-boot-cloud .version>
<spring-boot-revision >2.3.2.RELEASE</spring-boot-revision >
</properties >
<dependencies >
<!-- zuul依赖--> dependency >
<groupId >org.springframework.cloud</groupId >
<artifactId >spring-cloud-starter-netflix-zuul</artifactId >
<version >${spring-boot-cloud.version}</version >
</dependency >
<!-- actuator依赖--> dependency >
<groupId >org.springframework.boot</groupId >
<artifactId >spring-boot-starter-actuator</artifactId >
<version >${spring-boot-revision}</version >
</dependency >
<!-- eureka客户端依赖--> dependency >
<groupId >org.springframework.cloud</groupId >
<artifactId >spring-cloud-starter-netflix-eureka-client</artifactId >
<version >${spring-boot-cloud.version}</version >
</dependency >
<dependency >
<groupId >org.springframework.boot</groupId >
<artifactId >spring-boot-starter-web</artifactId >
<version >${spring-boot-revision}</version >
</dependency >
<dependency >
<groupId >org.springframework.boot</groupId >
<artifactId >spring-boot-starter-test</artifactId >
<version >${spring-boot-revision}</version >
<scope >test</scope >
<exclusions >
<exclusion >
<groupId >org.junit.vintage</groupId >
<artifactId >junit-vintage-engine</artifactId >
</exclusion >
</exclusions >
</dependency >
<!-- --> dependency >
<groupId >com.google.code.gson</groupId >
<artifactId >gson</artifactId >
<version >2.6.2</version >
</dependency >
<dependency >
<groupId >com.fasterxml.jackson.core</groupId >
<artifactId >jackson-core</artifactId >
<version >2.11.2</version >
</dependency >
<dependency >
<groupId >com.fasterxml.jackson.core</groupId >
<artifactId >jackson-annotations</artifactId >
<version >2.11.2</version >
</dependency >
<dependency >
<groupId >com.fasterxml.jackson.core</groupId >
<artifactId >jackson-databind</artifactId >
<version >2.11.2</version >
</dependency >
</dependencies >
<dependencyManagement >
<dependencies >
<dependency >
<groupId >org.springframework.cloud</groupId >
<artifactId >spring-cloud-dependencies</artifactId >
<version >${spring-cloud.version}</version >
<type >pom</type >
<scope >import</scope >
</dependency >
</dependencies >
</dependencyManagement >
server :
port : 7000
eureka :
client :
service-url :
defaultZone : http://localhost:8000/eureka
spring :
application :
name : zuul-depart
zuul :
routes :
# 指定微服务的路由规则# *为通配符# /** 可以匹配0到多级路径# /* 只能匹配一级路径# /? 只能匹配一级路径，且路径只能包含一个字符abcmsc-consumer-depart-8080 : /abc8080/**
abcmsc-consumer-depart-8090 : /abc8090/**
consumer-depart : /abc1/**
provider-depart : /abc2/**
# 屏蔽指定微服务名称# ignored-services: abcmsc-consumer-depart-8080# 屏蔽所有微服务名称ignored-services : " *" # 指定统一的前辍prefix : /abc
# 屏蔽指定的URIignored-patterns : /**/list/**
# 屏蔽掉指定的敏感头信息，其会将原来默认的Cookie、SetCookie、Authorization敏感头信息放开sensitive-headers : token
http://127.0.0.1:7000/abc/abc1/consumer/depart/get/1
就是请求到了： consumer-depart 的 consumer/depart/get/1 接口
@EnableFeignClients
找到jar 包；
META-INF/spring.factories:
org.springframework.cloud.openfeign.FeignAutoConfiguration
org.springframework.cloud.openfeign.FeignClientFactoryBean
org.springframework.cloud.openfeign.HystrixTargeter.target
找到jar 包；
META-INF/spring.factories:
org.springframework.web.server.handler.DefaultWebFilterChain.filter
org.springframework.web.server.handler.FilteringWebHandler.handle
org.springframework.web.server.adapter.HttpWebHandlerAdapter.handle
org.springframework.http.server.reactive.ReactorHttpHandlerAdapter.apply
org.springframework.web.reactive.DispatcherHandler.handle
org.springframework.web.reactive.handler.AbstractHandlerMapping.getHandler
org.springframework.cloud.gateway.handler.RoutePredicateHandlerMapping.getHandlerInternal
org.springframework.cloud.gateway.handler.RoutePredicateHandlerMapping.lookupRoute
org.springframework.web.reactive.DispatcherHandler.invokeHandler
org.springframework.web.reactive.result.SimpleHandlerAdapter.handle
org.springframework.cloud.gateway.handler.FilteringWebHandler.handle
org.springframework.cloud.gateway.handler.FilteringWebHandler.DefaultGatewayFilterChain.filter
org.springframework.cloud.gateway.filter.factory.AddRequestHeaderGatewayFilterFactory.apply
org.springframework.cloud.gateway.filter.NettyRoutingFilter.filter(远程请求)
org.springframework.cloud.gateway.filter.OrderedGatewayFilter.filter
docker search zipkin
docker pull openzipkin/zipkin
# --restart always 表示重启
docker run -d -p 9411:9411 --name zipkin openzipkin/zipkin
使用例子：07-via-consumer-8080 07-via-provider-8081