3.Zookeeper服务注册与发现

coderLJ

2020年03月17日 11:36

1. 注册中心Zookeeper

zookeeper是一个分布式协调工具，可以实现注册中心功能
关闭Linux服务器防火墙后启动zookeeper服务器
zookeeper服务器取代Eureka服务器，作为服务注册中心

2. 服务提供者

2.1 新建cloud-provider-payment8004

2.2 修改pom文件

添加zookeeper依赖

<!-- zookeeper-->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
</dependency>
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2.3 编写yml文件

server:
  port: 8004

#服务别名 --注册服务到注册中心的名称
spring:
  application:
    name: cloud-provider-payment
  cloud:
    zookeeper:
      connect-string: 192.168.56.102:2181
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2.4 主启动类

@SpringBootApplication
@EnableDiscoveryClient
public class PaymentMain8004 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8004.class, args);
    }
}
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2.5 Controller

@RestController
@Slf4j
public class PaymentController {

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

    @RequestMapping(value="/payment/zk")
    public String paymentzk(){
        return "springcloud with zk:"+serverPort+"\t"+ UUID.randomUUID().toString();
    }
}
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2.6 启动8004注册进zookeeper

2.6.1 启动后问题

centos上安装的zookeeper版本跟程序带的版本不一致导致了jar包冲突

2.6.2 解决方法

解决zookeeper jar包冲突问题

排除zk冲突后的新pom

<dependencies>
    <!-- zookeeper-->
    <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zookeeper3.4.10-->
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.4.10</version>
    </dependency>
    <!-- 引入自己定义的api通用包-->
    <dependency>
        <groupId>com.jd.springcloud</groupId>
        <artifactId>cloud-api-commons</artifactId>
        <version>${project.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
            <exclusion>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-classic</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <!-- devtools-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>
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2.7 验证测试

获取json 串

这样可清楚看到微服务8004在zookeeper上的注册信息

2.8 访问测试

http://localhost:8004/payment/zk

2.9 思考服务节点是临时节点还是持久节点

将payment8001服务关闭过了一会zookeeper又生成了一个新的流水号，一定时间内没有收到心跳就会把节点清除，比eureka要狠，所以服务节点是临时节点

3.服务消费者

3.1 新建cloud-consumerzk-order80

3.2 修改pom文件

添加zookeeper依赖

<dependencies>
    <!-- zookeeper-->
    <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zookeeper3.4.10-->
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.4.10</version>
    </dependency>
    <!-- 引入自己定义的api通用包-->
    <dependency>
        <groupId>com.jd.springcloud</groupId>
        <artifactId>cloud-api-commons</artifactId>
        <version>${project.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
            <exclusion>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-classic</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>
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3.3 编写文件yml文件

server:
  port: 80

spring:
  application:
    name: cloud-consumer-order
  cloud:
    zookeeper:
      connect-string: 192.168.56.102:2181
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3.4 主启动类

@SpringBootApplication
@EnableDiscoveryClient
public class OrderZkMain80 {

    public static void main(String[] args) {
        SpringApplication.run(OrderZkMain80.class,args);
    }
}
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3.5 业务类

3.5.1 配置Bean

@Configuration
public class ApplicationContextConfig {

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

@RestController
public class OrderZkController {

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

    @Resource
    private RestTemplate restTemplate;

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