SpringCloud-Consul

为什么引入

Consul 简介以及安装

控制台 localhost:8500

服务注册与发现

服务端

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-consul-discovery</artifactId>
    <exclusions>
        <exclusion>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
        </exclusion>
    </exclusions>
</dependency>

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

@SpringBootApplication
@MapperScan("org.zhouzhou.cloud.mapper")
@EnableDiscoveryClient // 添加注解
public class Main8001 {
    public static void main(String[] args) {
        SpringApplication.run(Main8001.class, args);
    }
}

客户端

前面步骤相同，但还需要修改一个位置，注入 <font style="color:#DF2A3F;">RedisTemplate</font>的时候，需要添加 <font style="color:#DF2A3F;">@LoadBalance</font>注解，因为如果使用服务名来调用的话，默认会开启负载均衡

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

我们修改之前写死的ip

//    private static final String serverURL = "http://localhost:8001";
private static final String serverURL = "http://cloud-payment-service:8001";

@GetMapping("/consumer/pay/get/{id}")
public Result<PayDTO> getPayByOrderNo(@PathVariable("id") Integer id) {
    return restTemplate.getForObject(serverURL + "/pay/get/" + id, Result.class, id);
}

注册中心异同点

服务配置与刷新

<!-- bootstrap -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-bootstrap</artifactId>
</dependency>
<!-- consul config -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-consul-config</artifactId>
</dependency>

新增配置文件 bootstrap.yml，bootstrap.yml优先加载

配置规范

spring:
  application:
    name: cloud-payment-service
  cloud:
    consul:
      host: localhost
      port: 8500
      discovery:
        service-name: ${spring.application.name}
      config:
        profile-separator: '-'
        format: yaml

@GetMapping("/getInfo")
    public Result<String> getInfo(@Value("${atguigu.info}") String info) {
        return Result.success("port: " + port + "\t Info: " + info);
    }

测试

配置刷新

1. 主启动类配置 @RefreshScope
2. 仅为演示，调低演示方便查看效果

spring:
  cloud:
    consul:
      config:
        watch:
          wait-time: 1

修改 data，为 version 2，保存