Spring Cloud 学习（三）Consul服务注册与发现

Consul是一套开源的分布式服务发现和配置管理系统，由HashiCorp公司用Go语言开发。

1、概述

Consul提供了微服务系统中的服务治理、配置中心、控制总线等功能。这些功能中的每一个都可以根据需要单独使用，也可以一起使用以构建全方位的服务网络，总之Consul提供了一种完整的服务网络解决方案。它具有很多优点，包括：基于raft协议，比较简洁；支持健康检查，同时支持HTTP和DNS协议支持跨数据中心的WAN集群 提供图形界面，跨平台，支持linux，mac，windows。

2、安装并运行consul

https://www.consul.io/downloa...，下载完成后，解压会出现consul.exe文件，在cmd下进入consul目录

访问http://localhost:8500就可以看见consul的界面

3、使用方法

新建cloud-providerconsul-payment8006模块

pom.xml

<dependencies>
        <dependency><!-- 引用自己定义的api通用包，可以使用Payment支付Entity -->
            <groupId>com.yu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--监控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--SpringCloud consul-server-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-consul-discovery</artifactId>
        </dependency>
        <!--热部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

yml

server:
  port: 8006

spring:
  application:
    name: consul-provider-payment
  cloud:
    consul:
      host: localhost
      port: 8500
      discovery:
        service-name: ${spring.application.name}

主启动

@SpringBootApplication
@EnableDiscoveryClient
public class PaymentMain8006 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8006.class, args);
    }
}

controller

@RestController
@Slf4j
public class PaymentController {
    @Value("${server.port}")
    private String serverPort;

    @RequestMapping(value = "/payment/consul")
    public String paymentConsul(){
        return "springCloud--consul:"+serverPort+"\t"+ UUID.randomUUID().toString();
    }
}

新建cloud-consumerconsul-order80模块

pom.xml

 <dependencies>
        <dependency><!-- 引用自己定义的api通用包，可以使用Payment支付Entity -->
            <groupId>com.yu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--监控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--SpringCloud consul-server-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-consul-discovery</artifactId>
        </dependency>
        <!--热部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

yml

server:
  port: 8090
spring:
  application:
    name: cloud-consumer-order
  cloud:
    consul:
      host: localhost
      port: 8500
      discovery:
        service-name: ${spring.application.name}

主启动

@SpringBootApplication
@EnableDiscoveryClient
public class ConsumerConsul8090 {
    public static void main(String[] args) {
        SpringApplication.run(ConsumerConsul8090.class, args);
    }
}

配置Bean

@Configuration
public class ApplicationContextConfig {

    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
}

controller

@RestController
@Slf4j
public class ConsumerController {
    public static final String INVOKE_URL = "http://consul-provider-payment";

    @Resource
    private RestTemplate restTemplate;

    @GetMapping(value = "/consumer/consul/zk")
    public String paymentInfo(){
        String result = restTemplate.getForObject(INVOKE_URL + "/payment/consul", String.class);
        return result;
    }
}

测试