详解使用Spring Cloud Consul实现服务的注册和发现
首先安装consul环境，参照之前的文章：https://www.nhooo.com/article/141789.htm
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
packagecom.pp.consul1;
importorg.springframework.boot.SpringApplication;
importorg.springframework.boot.autoconfigure.SpringBootApplication;
importorg.springframework.cloud.client.discovery.EnableDiscoveryClient;
importorg.springframework.web.bind.annotation.RequestMapping;
importorg.springframework.web.bind.annotation.RestController;
@SpringBootApplication
@EnableDiscoveryClient
@RestController
publicclassConsulApp{
@RequestMapping("/home")
publicObjecthome(){
System.out.println("1111111111111");
return"OK11";
}
publicstaticvoidmain(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=${server.port}
spring.cloud.consul.discovery.healthCheckUrl=http://192.168.2.95:9955/health
spring.cloud.consul.discovery.healthCheckInterval=10s
spring.cloud.consul.discovery.tags=dev
看过我之前文章的，应该对这些配置很清楚了。这样，一个服务端就配置写好了。
由于我们增加了@EnableDiscoveryClient注解，所以，系统启动的时候，就会向consul注册一个服务，服务的名字为tomcat,ID为tomcat1
访问consul的HTTPAPI/v1/catalog/service/tomcat输出如下：
{
"Node":"192.168.1.100",
"Address":"192.168.1.100",
"ServiceID":"tomcat1",
"ServiceName":"tomcat",
"ServiceTags":["dev"],
"ServiceAddress":"192.168.2.95",
"ServicePort":9955,
"ServiceEnableTagOverride":false,
"CreateIndex":993,
"ModifyIndex":1057
}
二：服务端2
项目依赖和上面一样
packagecom.pp.consul2;
importorg.springframework.boot.SpringApplication;
importorg.springframework.boot.autoconfigure.SpringBootApplication;
importorg.springframework.cloud.client.discovery.EnableDiscoveryClient;
importorg.springframework.web.bind.annotation.RequestMapping;
importorg.springframework.web.bind.annotation.RestController;
@SpringBootApplication
@EnableDiscoveryClient
@RestController
publicclassConsulApp{
@RequestMapping("/home")
publicObjecthome(){
System.out.println("2222222222222222");
return"OK22";
}
publicstaticvoidmain(String[]args){
SpringApplication.run(ConsulApp.class,args);
}
}
application.properties配置内容：
server.port=9966
spring.application.name=Consul-Server-2
spring.cloud.consul.host=192.168.1.100
spring.cloud.consul.port=8500
spring.cloud.consul.enabled=true
spring.cloud.consul.discovery.enabled=true
spring.cloud.consul.discovery.instanceId=tomcat2
spring.cloud.consul.discovery.serviceName=tomcat
spring.cloud.consul.discovery.hostname=192.168.2.95
spring.cloud.consul.discovery.port=${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
packagecom.pp.client;
importorg.springframework.beans.factory.annotation.Autowired;
importorg.springframework.boot.SpringApplication;
importorg.springframework.boot.autoconfigure.SpringBootApplication;
importorg.springframework.cloud.client.discovery.DiscoveryClient;
importorg.springframework.cloud.client.discovery.EnableDiscoveryClient;
importorg.springframework.cloud.client.loadbalancer.LoadBalancerClient;
importorg.springframework.web.bind.annotation.RequestMapping;
importorg.springframework.web.bind.annotation.RestController;
@SpringBootApplication
@EnableDiscoveryClient
@RestController
publicclassConsulClient{
@Autowired
privateLoadBalancerClientloadBalancer;
@Autowired
privateDiscoveryClientdiscoveryClient;
/**
*从所有服务中选择一个服务（轮询）
*/
@RequestMapping("/discover")
publicObjectdiscover(){
returnloadBalancer.choose("tomcat").getUri().toString();
}
/**
*获取所有服务
*/
@RequestMapping("/services")
publicObjectservices(){
returndiscoveryClient.getInstances("tomcat");
}
publicstaticvoidmain(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毛票票。
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