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详解使用Spring Cloud Consul实现服务的注册和发现

2019年07月19日  | 移动技术网IT编程  | 我要评论

首先安装consul环境，参照之前的文章：

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移动技术网。

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