Spring Cloud Consul通過自動(dòng)配置和綁定到Spring Environment和其他Spring編程模型習(xí)語，為Spring Boot應(yīng)用程序提供Consul集成。通過一些簡單的注解，可以快速啟用和配置應(yīng)用程序內(nèi)的常用模式，并使用Hashicorp的Consul構(gòu)建大型分布式系統(tǒng)。提供的模式包括服務(wù)發(fā)現(xiàn)、分布式配置和控制總線。
接下來這篇文章就介紹一下怎么使用consul來搭建一個(gè)集成了注冊中心和配置中心服務(wù)，類似于nacos：nacos作為注冊中心和配置中心
目錄
1、初步學(xué)習(xí)并安裝consul
第一步：進(jìn)入spring官網(wǎng)：https://spring.io/
第二步：依次點(diǎn)擊Projects >> Spring Cloud
第三步：找到并點(diǎn)擊spring coud consul
第四步：安裝consul
第五步、訪問consul控制臺(tái)
2、springboot整合consul
一、注冊到consul
二、從consul拉取配置
1、初步學(xué)習(xí)并安裝consul
第一步：進(jìn)入spring官網(wǎng)：https://spring.io/
第二步：依次點(diǎn)擊Projects >> Spring Cloud
第三步：找到并點(diǎn)擊spring coud consul
然后看一下consul的特性
- 服務(wù)注冊與發(fā)現(xiàn)
- 支持ribbon客戶端負(fù)載均衡器
- 支持zuul網(wǎng)關(guān)服務(wù)
- 通過key/value存儲(chǔ)實(shí)現(xiàn)分布式配置
- 控制總線
Spring Cloud Consul features:
Service Discovery: instances can be registered with the Consul agent and clients can discover the instances using Spring-managed beans
Supports Ribbon, the client side load-balancer via Spring Cloud Netflix
Supports Spring Cloud LoadBalancer - a client side load-balancer provided by the Spring Cloud project
Supports Zuul, a dynamic router and filter via Spring Cloud Netflix
Distributed Configuration: using the Consul Key/Value store
Control Bus: Distributed control events using Consul Events
第四步：安裝consul
要使用consul，首先要先安裝consul，安裝consul很簡單，下載consul.exe然后在命令窗口運(yùn)行起來。
上一張圖片的頁面拉到最下面，點(diǎn)擊藍(lán)色鏈接進(jìn)入consul官網(wǎng)
在consul官網(wǎng)的頁面，找到并點(diǎn)擊install。
點(diǎn)擊install后跳轉(zhuǎn)到的consul安裝的頁面
切換到windows，然后找到Binary download for Windows下面的download鏈接，點(diǎn)擊下載consul。
下載完成后，會(huì)得到一個(gè)壓縮文件，里面只有一個(gè).exe的可運(yùn)行文件（果然如傳說的一樣ovo）。
解壓這個(gè)壓縮文件，把解壓得到的sonsul.exe復(fù)制到D盤program目錄下，然后在當(dāng)前目錄的地址輸入cmd打開命令窗口，輸入以下命令之一。
consul agent -dev # 以開發(fā)模式運(yùn)行
consul agent -server # 以服務(wù)器模式運(yùn)行第五步、訪問consul控制臺(tái)
然后在瀏覽器的地址欄輸入localhost:8500，即可訪問consul的控制臺(tái)了。
前面的consul特性的特性有一條，通過key/value存儲(chǔ)來實(shí)現(xiàn)分布式配置，我們點(diǎn)擊一下左邊菜單欄的Key/Value，然后點(diǎn)擊右上角的create按鈕。
然后我們看到
存儲(chǔ)配置文件時(shí)，其實(shí)這里的key就是我們的配置文件的文件名，當(dāng)然也可以存字符串和其他的數(shù)據(jù)。
2、springboot整合consul
好了，接下來進(jìn)入這篇文章最重要的部分，springboot整合consul
首先，創(chuàng)建一個(gè)springboot項(xiàng)目，就叫consul
一、注冊到consul
修改application.yml配置文件
spring:
application:
name: consul
cloud :
consul :
port: 8500
host: localhost
discovery:
enabled: true
register: true
hostname: localhost
health-check-critical-timeout: 30s
service-name: ${spring.application.name}
instance-id: ${spring.application.name}:${server.port}
server:
port: 8080注意，這里不能設(shè)置profiles，否則啟動(dòng)時(shí)會(huì)報(bào)錯(cuò)
spring:
profiles: dev # 這個(gè)代碼加了會(huì)報(bào)錯(cuò)
application:
name: consul
cloud :
consul :
port: 8500
host: localhost
discovery:
enabled: true
register: true
hostname: localhost
health-check-critical-timeout: 30s
service-name: ${spring.application.name}
# instance-id: ${spring.application.name}:${server.port}
server:
port: 8080
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jmxMBeanExporter' defined in class path resource [org/springframework/boot/actuate/autoconfigure/endpoint/jmx/JmxEndpointAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.endpoint.jmx.JmxEndpointExporter]: Factory method 'jmxMBeanExporter' threw exception; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.cloud.client.serviceregistry.ServiceRegistryAutoConfiguration$ServiceRegistryEndpointConfiguration': Unsatisfied dependency expressed through field 'registration'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'consulRegistration' defined in class path resource [org/springframework/cloud/consul/serviceregistry/ConsulAutoServiceRegistrationAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.consul.serviceregistry.ConsulAutoRegistration]: Factory method 'consulRegistration' threw exception; nested exception is java.lang.IllegalArgumentException: Consul service ids must not be empty, must start with a letter, end with a letter or digit, and have as interior characters only letters, digits, and hyphen: null
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:655) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:635) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1176) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at com.example.consul.ConsulApplication.main(ConsulApplication.java:18) [classes/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.endpoint.jmx.JmxEndpointExporter]: Factory method 'jmxMBeanExporter' threw exception; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.cloud.client.serviceregistry.ServiceRegistryAutoConfiguration$ServiceRegistryEndpointConfiguration': Unsatisfied dependency expressed through field 'registration'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'consulRegistration' defined in class path resource [org/springframework/cloud/consul/serviceregistry/ConsulAutoServiceRegistrationAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.consul.serviceregistry.ConsulAutoRegistration]: Factory method 'consulRegistration' threw exception; nested exception is java.lang.IllegalArgumentException: Consul service ids must not be empty, must start with a letter, end with a letter or digit, and have as interior characters only letters, digits, and hyphen: null
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:650) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
... 20 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.cloud.client.serviceregistry.ServiceRegistryAutoConfiguration$ServiceRegistryEndpointConfiguration': Unsatisfied dependency expressed through field 'registration'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'consulRegistration' defined in class path resource [org/springframework/cloud/consul/serviceregistry/ConsulAutoServiceRegistrationAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.consul.serviceregistry.ConsulAutoRegistration]: Factory method 'consulRegistration' threw exception; nested exception is java.lang.IllegalArgumentException: Consul service ids must not be empty, must start with a letter, end with a letter or digit, and have as interior characters only letters, digits, and hyphen: null
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1420) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:408) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1176) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1109) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer.lambda$createEndpointBean$1(EndpointDiscoverer.java:145) ~[spring-boot-actuator-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer$EndpointBean.getBean(EndpointDiscoverer.java:469) ~[spring-boot-actuator-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer.getFilterEndpoint(EndpointDiscoverer.java:329) ~[spring-boot-actuator-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer.isFilterMatch(EndpointDiscoverer.java:317) ~[spring-boot-actuator-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer.isEndpointFiltered(EndpointDiscoverer.java:292) ~[spring-boot-actuator-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer.isEndpointExposed(EndpointDiscoverer.java:265) ~[spring-boot-actuator-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer.convertToEndpoints(EndpointDiscoverer.java:181) ~[spring-boot-actuator-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer.discoverEndpoints(EndpointDiscoverer.java:125) ~[spring-boot-actuator-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer.getEndpoints(EndpointDiscoverer.java:117) ~[spring-boot-actuator-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.actuate.autoconfigure.endpoint.jmx.JmxEndpointAutoConfiguration.jmxMBeanExporter(JmxEndpointAutoConfiguration.java:95) ~[spring-boot-actuator-autoconfigure-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_152]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_152]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_152]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_152]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
... 21 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'consulRegistration' defined in class path resource [org/springframework/cloud/consul/serviceregistry/ConsulAutoServiceRegistrationAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.consul.serviceregistry.ConsulAutoRegistration]: Factory method 'consulRegistration' threw exception; nested exception is java.lang.IllegalArgumentException: Consul service ids must not be empty, must start with a letter, end with a letter or digit, and have as interior characters only letters, digits, and hyphen: null
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:655) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:635) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1176) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1307) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1227) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
... 55 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.consul.serviceregistry.ConsulAutoRegistration]: Factory method 'consulRegistration' threw exception; nested exception is java.lang.IllegalArgumentException: Consul service ids must not be empty, must start with a letter, end with a letter or digit, and have as interior characters only letters, digits, and hyphen: null
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:650) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
... 68 common frames omitted
Caused by: java.lang.IllegalArgumentException: Consul service ids must not be empty, must start with a letter, end with a letter or digit, and have as interior characters only letters, digits, and hyphen: null
at org.springframework.cloud.consul.serviceregistry.ConsulAutoRegistration.normalizeForDns(ConsulAutoRegistration.java:185) ~[spring-cloud-consul-discovery-2.2.8.RELEASE.jar:2.2.8.RELEASE]
at org.springframework.cloud.consul.serviceregistry.ConsulAutoRegistration.getInstanceId(ConsulAutoRegistration.java:176) ~[spring-cloud-consul-discovery-2.2.8.RELEASE.jar:2.2.8.RELEASE]
at org.springframework.cloud.consul.serviceregistry.ConsulAutoRegistration.registration(ConsulAutoRegistration.java:87) ~[spring-cloud-consul-discovery-2.2.8.RELEASE.jar:2.2.8.RELEASE]
at org.springframework.cloud.consul.serviceregistry.ConsulAutoServiceRegistrationAutoConfiguration.consulRegistration(ConsulAutoServiceRegistrationAutoConfiguration.java:82) ~[spring-cloud-consul-discovery-2.2.8.RELEASE.jar:2.2.8.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_152]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_152]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_152]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_152]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
... 69 common frames omitted
通過debug發(fā)現(xiàn)最后獲取到的instanceId為null，這個(gè)問題找了半天才發(fā)現(xiàn)原因的，注意避坑！
?Consul service ids must not be empty, must start with a letter, end with a letter or digit, and have as interior characters only letters, digits, and hyphen: null
最后啟動(dòng)項(xiàng)目，訪問consul發(fā)現(xiàn)注冊到了consul上，并且服務(wù)名為${spring.application.name}-${server.port}，這也是不設(shè)置instance-id時(shí)默認(rèn)的服務(wù)名。
二、從consul拉取配置
上面已經(jīng)讓我們的項(xiàng)目注冊到consul了，接下來修改一下配置文件，從consul拉取配置。
spring:
application:
name: consul
cloud :
consul :
port: 8500
host: localhost
discovery:
enabled: true
register: true
hostname: localhost
health-check-critical-timeout: 30s
service-name: ${spring.application.name}
config:
enabled: true
prefix: config # 配置文件所在文件夾，默認(rèn)值就是config
name: consul-dev.yaml # 配置文件名，也就是key
server:
port: 8080接著，在consul里創(chuàng)建一個(gè)config文件夾，在config文件夾下面創(chuàng)建一個(gè)consul-dev.yaml
user:
name: heyunlin注意，文件夾和文件的區(qū)別在于key的結(jié)尾有沒有/
?最后，創(chuàng)建一個(gè)控制器，獲取配置文件consul-dev.yaml中的配置
package com.example.consul.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @author heyunlin
* @version 1.0
*/
@RestController
@RequestMapping(path = "/config")
public class ConfigController {
@Value("${user.name}")
String username;
@GetMapping("/username")
public String getPort() {
return username;
}
}重啟項(xiàng)目，訪問http://localhost:8080/config/username發(fā)現(xiàn)成功獲取并返回了字符串heyunlin
至此，springboot整合consul就算完成了。文章涉及的代碼已經(jīng)上傳到git，按需獲取
consul使用案例https://gitee.com/he-yunlin/consul.git文章來源：http://www.zghlxwxcb.cn/news/detail-589241.html
好了，文章就分享到這里了，看完不要忘了點(diǎn)贊+收藏哦~文章來源地址http://www.zghlxwxcb.cn/news/detail-589241.html
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