详解使用Spring Cloud Consul实现服务的注册和发现
作者：猪哥
2018-06-11
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);
}
}
