六、Zookeeper服务注册与发现

1）搭建zookeeper服务并启动

这里就不再赘述了，直接去我的博客下看zookeeper在linux上的搭建

2) 支付服务注册进zookeeper

步骤如下：

项目结构：

① 添加依赖

【注意】spring-cloud-starter-zookeeper-discovery中自带了 zookeeper3.5.3

如果自己服务器上zookeeper的版本不是zookeeper3.5.3，则需要排除该依赖

<dependencies>
    <!-- SpringBoot整合Web组件 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency><!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
        <groupId>com.atguigu.springcloud</groupId>
        <artifactId>cloud-api-commons</artifactId>
        <version>${project.version}</version>
    </dependency>
    <!-- SpringBoot整合zookeeper客户端 -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        <!--先排除自带的zookeeper3.5.3-->
        <exclusions>
            <exclusion>
                <groupId>org.apache.zookeeper</groupId>
                <artifactId>zookeeper</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <!--添加zookeeper3.4.9版本-->
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.4.9</version>
    </dependency>
    <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>

② 配置文件

#8004 表示注册到zookeeper的支付服务提供者的端口号
server:
  port: 8004

spring:
  application:
    name: cloud-provider-payment
  cloud:
    zookeeper:
      connect-string: 172.20.10.14:2181

③ 主启动类

@SpringBootApplication
@EnableDiscoveryClient  //使用consul或者zookeeper注册中心时，向其注册服务
public class PaymentMain8004 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8004.class,args);
    }
}

④ controller

@RestController
@Slf4j
public class PaymentController {

    @Value("${server.port}")
    private String serverPort;

    @RequestMapping(value = "/payment/zk")
    public String paymentzk(){
        return "springcloud with zookeeper:"+ serverPort+ " "+ UUID.randomUUID().toString();
    }


}

⑤ 启动 该服务提供方，测试 ： http://localhost:8004/payment/zk

连上zookeeper客户端

./zkCli.sh --> ls / ---> ls /services

查看注册服务的相关信息，获得一个流水号

查看zookeeperj节点的相关信息

当cloud-provider-payment服务停掉时，zookeeper会剔除相应的服务节点

3) 订单服务注册进zookeeper

项目结构

①、添加依赖

<dependencies>
    <!-- SpringBoot整合Web组件 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- SpringBoot整合zookeeper客户端 -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        <!--先排除自带的zookeeper-->
        <exclusions>
            <exclusion>
                <groupId>org.apache.zookeeper</groupId>
                <artifactId>zookeeper</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <!--添加zookeeper3.4.9版本-->
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.4.9</version>
    </dependency>
    <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>

②、编写配置文件 application.xml

#8004 表示注册到zookeeper的支付服务提供者的端口号
server:
  port: 80

spring:
  application:
    name: cloud-consumer-order
  cloud:
    zookeeper:
      connect-string: 172.20.10.14:2181

③、编写主配置类

@SpringBootApplication
@EnableDiscoveryClient
public class OrderZkMain80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderZkMain80.class,args);
    }
}

④、注入restTemplate

@Configuration
public class ApplicationContextConfig {

    @Bean
    //一定要加这个注解，因为远程调用的地址写的是 服务名
    // http://cloud-provider-payment ,不加会报错呀！！！！
    @LoadBalanced 
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
}

⑤、controller

@RestController
@Slf4j
public class OrderZkController {

    private static final String INVOKE_URL = "http://cloud-provider-payment" ;

    @Autowired
    private RestTemplate restTemplate;


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

⑥ 启动服务后：

进入zookeeper客户端查看： 发现cloud-consumer-order 已经注册进zookeeper.

访问：http://localhost/consumer/payment/zk

访问成功，说明zookeeper确实能够代替eureka称为注册中心