SpringCloud-eureka构建简单注册中心

由于兼容性问题，本例中采用spring boot 1.5.x，首先点击这里创建一个gradle工程，然后导入到idea.

添加build.gradle相关依赖

dependencyManagement {
    imports {
        mavenBom 'org.springframework.cloud:spring-cloud-dependencies:Edgware.SR4'
    }
}

dependencies {
    compile('org.springframework.boot:spring-boot-starter')
    compile('org.springframework.cloud:spring-cloud-starter-eureka-server')
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

添加@EnableEurekaServer

@EnableEurekaServer
@SpringBootApplication
public class CloudApplication {
    public static void main(String[] args) {
        SpringApplication.run(CloudApplication.class, args);
    }
}

更新配置文件，配置服务名称，端口等等。

spring.application.name=eureka-server
server.port=1111
eureka.instance.hostname=localhost
# 关闭保护机制
#eureka.server.enable-self-preservation=false
# 关闭自己注册自己
eureka.client.register-with-eureka=false
# 不需要检索服务
eureka.client.fetch-registry=false
eureka.client.serviceUrl.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka/

下面就可以启动服务了，然后打开http://localhost:1111/控制台(目前没有服务注册)

同样创建一个gradle工程，配置为服务注册客户端。
在build.gradle导入相关依赖

dependencyManagement {
    imports {
        mavenBom 'org.springframework.cloud:spring-cloud-dependencies:Edgware.SR4'
    }
}
dependencies {
    compile('org.springframework.boot:spring-boot-starter')
    compile('org.springframework.boot:spring-boot-starter-web')
    compile 'org.slf4j:slf4j-api:1.7.14'
    compile('org.springframework.cloud:spring-cloud-starter-eureka')
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

修改配置文件application.properties

spring.application.name=hello-service
eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/
server.port=8081

启动类添加@EnableDiscoveryClient，激活eureka中的DiscoveryClient的实现，如下：

@EnableDiscoveryClient
@SpringBootApplication
public class CloudApplication {
    public static void main(String[] args) {
        SpringApplication.run(CloudApplication.class, args);
    }
}

最后，添加一个controller，方便服务测试，如下：

@RestController
public class HelloController {

    @Autowired
    private DiscoveryClient client;

    @RequestMapping(value = "/hello", method = RequestMethod.GET)
    public String hello() throws Exception {
        ServiceInstance instance = client.getLocalServiceInstance();

        logger.info("/hello, host:" + instance.getHost() + ", service_id:" + instance.getServiceId());
        return "Hello World";
    }

启动服务，然后查看eureka控制台，发现有新服务注册，测试服务接口http://desktop-7brumlo:8081/hello