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详解使用Spring Cloud Consul实现服务的注册和发现

2024-07-14 08:41:12
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首先安装consul环境

项目规划,2个服务端,1个客户端

首先来看服务端,

一:服务端1:

项目依赖

<dependencyManagement>   <dependencies>     <dependency>       <groupId>org.springframework.cloud</groupId>       <artifactId>spring-cloud-consul-dependencies</artifactId>       <version>1.0.1.RELEASE</version>       <type>pom</type>       <scope>import</scope>     </dependency>   </dependencies> </dependencyManagement>  <dependencies>   <dependency>     <groupId>org.springframework.boot</groupId>     <artifactId>spring-boot-actuator</artifactId>     <version>1.3.5.RELEASE</version>   </dependency>   <dependency>     <groupId>org.springframework.cloud</groupId>     <artifactId>spring-cloud-starter-consul-discovery</artifactId>   </dependency> </dependencies> 

注意,增加spring-boot-actuator是为了项目可以访问/health 路径来判断服务是否健康

package com.pp.consul1;  import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;  @SpringBootApplication @EnableDiscoveryClient @RestController public class ConsulApp {      @RequestMapping("/home")   public Object home() {     System.out.println("1111111111111");     return "OK11";   }      public static void main( String[] args ) {     SpringApplication.run(ConsulApp.class, args);   } } 

application.properties 配置内容

server.port=9955  spring.application.name=Consul-Server-1 spring.cloud.consul.host=192.168.1.100 spring.cloud.consul.port=8500 spring.cloud.consul.enabled=true spring.cloud.consul.discovery.enabled=true spring.cloud.consul.discovery.instanceId=tomcat1 spring.cloud.consul.discovery.serviceName=tomcat spring.cloud.consul.discovery.hostname=192.168.2.95 spring.cloud.consul.discovery.port=${server.port} spring.cloud.consul.discovery.healthCheckUrl=http://192.168.2.95:9955/health spring.cloud.consul.discovery.healthCheckInterval=10s spring.cloud.consul.discovery.tags=dev 

看过我之前文章的,应该对这些配置很清楚了。这样,一个服务端就配置写好了。

由于我们增加了@EnableDiscoveryClient注解,所以,系统启动的时候,就会向consul注册一个服务,服务的名字为tomcat, ID为tomcat1

访问consul的HTTP API /v1/catalog/service/tomcat 输出如下:

{   "Node":"192.168.1.100",   "Address":"192.168.1.100",   "ServiceID":"tomcat1",   "ServiceName":"tomcat",   "ServiceTags":["dev"],   "ServiceAddress":"192.168.2.95",   "ServicePort":9955,   "ServiceEnableTagOverride":false,   "CreateIndex":993,   "ModifyIndex":1057 } 

二:服务端2

项目依赖和上面一样 

package com.pp.consul2;  import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;  @SpringBootApplication @EnableDiscoveryClient @RestController public class ConsulApp {      @RequestMapping("/home")   public Object home() {     System.out.println("2222222222222222");     return "OK22";   }      public static void main( String[] args ) {     SpringApplication.run(ConsulApp.class, args);   } } 

application.properties 配置内容:

server.port=9966  spring.application.name=Consul-Server-2 spring.cloud.consul.host=192.168.1.100 spring.cloud.consul.port=8500 spring.cloud.consul.enabled=true spring.cloud.consul.discovery.enabled=true spring.cloud.consul.discovery.instanceId=tomcat2 spring.cloud.consul.discovery.serviceName=tomcat spring.cloud.consul.discovery.hostname=192.168.2.95 spring.cloud.consul.discovery.port=${server.port} spring.cloud.consul.discovery.healthCheckUrl=http://192.168.2.95:9966/health spring.cloud.consul.discovery.healthCheckInterval=10s spring.cloud.consul.discovery.tags=test 

三:客户端

项目依赖,只需要spring-cloud-starter-consul-discovery

application.properties 配置内容:

server.port=9977  spring.application.name=Consul-Client spring.cloud.consul.host=192.168.1.100 spring.cloud.consul.port=8500 spring.cloud.consul.discovery.register=false 

注意,这里的spring.cloud.consul.discovery.register需要配置成false,否则系统启动的时候,会向consul注册一个服务

package com.pp.client;  import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.DiscoveryClient; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; import org.springframework.cloud.client.loadbalancer.LoadBalancerClient; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;  @SpringBootApplication @EnableDiscoveryClient @RestController public class ConsulClient {      @Autowired   private LoadBalancerClient loadBalancer;      @Autowired   private DiscoveryClient discoveryClient;      /**    * 从所有服务中选择一个服务(轮询)    */   @RequestMapping("/discover")   public Object discover() {     return loadBalancer.choose("tomcat").getUri().toString();   }      /**    * 获取所有服务    */   @RequestMapping("/services")   public Object services() {     return discoveryClient.getInstances("tomcat");   }      public static void main( String[] args ) {     SpringApplication.run(ConsulClient.class, args);   } } 

启动之后,就可以访问/discover,/services 查看效果了。

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持VeVb武林网。


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