使用Spring Cloud Consul实现服务的注册和发现

怼烎@ 2022-09-22 04:58 194阅读 0赞

首先安装consul环境，参照之前的文章：http://blog.csdn.net/mn960mn/article/details/51753893

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。