詳解使用Spring Cloud Consul實(shí)現(xiàn)服務(wù)的注冊和發(fā)現(xiàn)

更新時(shí)間：2018年06月11日 09:42:20 作者：西夏一品堂

這篇文章主要介紹了詳解使用Spring Cloud Consul實(shí)現(xiàn)服務(wù)的注冊和發(fā)現(xiàn)，小編覺得挺不錯(cuò)的，現(xiàn)在分享給大家，也給大家做個(gè)參考。一起跟隨小編過來看看吧

首先安裝consul環(huán)境，參照之前的文章：http://www.dbjr.com.cn/article/141789.htm

項(xiàng)目規(guī)劃，2個(gè)服務(wù)端，1個(gè)客戶端

首先來看服務(wù)端，

一：服務(wù)端1：

項(xiàng)目依賴

<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是為了項(xiàng)目可以訪問/health 路徑來判斷服務(wù)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 配置內(nèi)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

看過我之前文章的，應(yīng)該對這些配置很清楚了。這樣，一個(gè)服務(wù)端就配置寫好了。

由于我們增加了@EnableDiscoveryClient注解，所以，系統(tǒng)啟動(dòng)的時(shí)候，就會(huì)向consul注冊一個(gè)服務(wù)，服務(wù)的名字為tomcat, ID為tomcat1

訪問consul的HTTP API /v1/catalog/service/tomcat 輸出如下：

{ 
  "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：服務(wù)端2

項(xiàng)目依賴和上面一樣

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 配置內(nèi)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：客戶端

項(xiàng)目依賴，只需要spring-cloud-starter-consul-discovery

application.properties 配置內(nèi)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，這里的spring.cloud.consul.discovery.register需要配置成false，否則系統(tǒng)啟動(dòng)的時(shí)候，會(huì)向consul注冊一個(gè)服務(wù)

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; 
   
  /** 
   * 從所有服務(wù)中選擇一個(gè)服務(wù)（輪詢） 
   */ 
  @RequestMapping("/discover") 
  public Object discover() { 
    return loadBalancer.choose("tomcat").getUri().toString(); 
  } 
   
  /** 
   * 獲取所有服務(wù) 
   */ 
  @RequestMapping("/services") 
  public Object services() { 
    return discoveryClient.getInstances("tomcat"); 
  } 
   
  public static void main( String[] args ) { 
    SpringApplication.run(ConsulClient.class, args); 
  } 
}

啟動(dòng)之后，就可以訪問/discover，/services 查看效果了。

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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