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详解使用Spring Cloud Consul实现服务的注册和发现

时间:2018-06-11 13:05:00 编辑:猪哥 来源:转载

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

 
   
     
      org.springframework.cloud 
      spring-cloud-consul-dependencies 
      1.0.1.RELEASE 
      pom 
      import 
     
   
 
 
 
   
    org.springframework.boot 
    spring-boot-actuator 
    1.3.5.RELEASE 
   
   
    org.springframework.cloud 
    spring-cloud-starter-consul-discovery 
   
 

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。

由于大家增加了@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。

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