consul作为数据配置中心.md

consul作为数据配置中心

基于spring boot 2.0.5.RELEASE

依赖

dependencies {
  //	服务注册和发现功能
	compile('org.springframework.cloud:spring-cloud-starter-consul-discovery')
  //	consul的配置中心功能
	compile('org.springframework.cloud:spring-cloud-starter-consul-config')
  //这个要引入
	compile('org.springframework.boot:spring-boot-starter-web')
	compile('org.springframework.boot:spring-boot-configuration-processor')
	testCompile('org.springframework.boot:spring-boot-starter-test')
}

配置文件

分别创建三个配置文件application.yml,application-dev.yml,bootstrap.yml:

application.yml配置文件:

spring:
  profiles:
    active: dev

application-dev.yml配置文件:

server:
  port: 8080
spring:
  application:
    name: demo-consul

bootstrap.yml配置文件:

spring:
  cloud:
    consul:
      port: 8500
      host: localhost
      config:
        enabled: true
        format: YAML
        data-key: data  //kv中k的后缀(suffix)
      discovery:
        health-check-path: /health
        health-check-interval: 10s
        enabled: true
        instance-id: ${spring.application.name}
        tags: dev, dev1
        service-name: ${spring.application.name}

在consul中配置

在consul中配置配置kv，默认是config文件夹， 现在配置的是config/application,dev/data,也可以配置config/demo-consul/data,application是指所有的项目，dev是指dev配置文件，而demo-consul仅仅是取demo-consul项目下的配置文件

测试

RedisConfig.java:

@ConfigurationProperties(prefix = "redis.config")
public class RedisConfig {

    private String url;
    private int port;
    private int timeOut;

    //omit...
}

ResourceController.java:

@RestController
public class ResourceController {

    @Value("${memo}")
    private String memo;

    @Autowired
    private RedisConfig redisConfig;

    @RequestMapping(value = "/ping", method = RequestMethod.GET)
    private String ping(){
        System.out.println("name: "+ memo);
        return "name: " + memo+ " redis config: "+ redisConfig;
    }
}

DemoConsulApplication.java:

@SpringBootApplication
@EnableDiscoveryClient
@EnableConfigurationProperties({RedisConfig.class})
public class DemoConsulApplication {


	public static void main(String[] args) {
		SpringApplication.run(DemoConsulApplication.class, args);
	}
}

结果

name: srping redis config: RedisConfig{url='localhost', port=6380, timeOut=5000}

结论

以@Value形式获取配置中心数据，修改配置中心文件后不能立即生效，需要重启应用程序服务器;而使用ConfigurationProperties形式，则能立即生效