II-第二章：（5）Zookeeper注册中心

一、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，zk作为服务注册中心

二、服务提供者

（1）新建cloud-provider-payment8004

（2）改 POM

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>cloud2020artifactId>
        <groupId>com.njf.springcloudgroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>

    <artifactId>cloud-provider-payment8004artifactId>

    <properties>
        <maven.compiler.source>8maven.compiler.source>
        <maven.compiler.target>8maven.compiler.target>
    properties>

    <dependencies>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>com.njf.springcloudgroupId>
            <artifactId>cloud-api-commonsartifactId>
            <version>1.0-SNAPSHOTversion>
        dependency>

        
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-zookeeper-discoveryartifactId>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-devtoolsartifactId>
            <scope>runtimescope>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>

project>

（3）写 YML


#8004表示注册到zookeeper服务器的支付服务提供者端口号
server:
  port: 8004
#服务别名----注册zookeeper到注册中心名称
spring:
  application:
    name: cloud-provider-payment
  cloud:
    zookeeper:
      connect-string: 127.0.0.1:2181
      #connect-string: 192.168.111.144:2181

（4）主启动类

@SpringBootApplication
@EnableDiscoveryClient//该注解用于向使用consul或者zookeeper作为注册中心时注册服务
public class PaymentMain8004 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8004.class,args);
    }
}

（5）Controller

@RestController
public class PaymentController {

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

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

}

（6）启动8004注册进zookeeper

启动后问题：

这是为什么呢？解决zookeeper版本jar包冲突问题

排出zk冲突后的新POM

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>cloud2020artifactId>
        <groupId>com.njf.springcloudgroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>

    <artifactId>cloud-provider-payment8004artifactId>

    <properties>
        <maven.compiler.source>8maven.compiler.source>
        <maven.compiler.target>8maven.compiler.target>
    properties>

    <dependencies>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>com.njf.springcloudgroupId>
            <artifactId>cloud-api-commonsartifactId>
            <version>1.0-SNAPSHOTversion>
        dependency>

        
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-zookeeper-discoveryartifactId>
            
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeepergroupId>
                    <artifactId>zookeeperartifactId>
                exclusion>
            exclusions>
        dependency>
        
        <dependency>
            <groupId>org.apache.zookeepergroupId>
            <artifactId>zookeeperartifactId>
            <version>3.4.9version>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-devtoolsartifactId>
            <scope>runtimescope>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>

project>

（7）测试

测试1：

http://localhost:8004/payment/zk

测试2：

获得json串后用在线工具查看试试

（8）思考

服务节点是临时节点还是持久节点？

作为临时节点，当服务宕机之后，当指定的心跳之间没有收到响应，该Node节点就会消失。（CP）

三、服务消费者

（1）新建cloud-consumerzk-order80

（2）改 POM

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>cloud2020artifactId>
        <groupId>com.njf.springcloudgroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>

    <artifactId>cloud-consumerzk-order80artifactId>

    <properties>
        <maven.compiler.source>8maven.compiler.source>
        <maven.compiler.target>8maven.compiler.target>
    properties>

    <dependencies>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>com.njf.springcloudgroupId>
            <artifactId>cloud-api-commonsartifactId>
            <version>1.0-SNAPSHOTversion>
        dependency>

        
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-zookeeper-discoveryartifactId>
            
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeepergroupId>
                    <artifactId>zookeeperartifactId>
                exclusion>
            exclusions>
        dependency>
        
        <dependency>
            <groupId>org.apache.zookeepergroupId>
            <artifactId>zookeeperartifactId>
            <version>3.4.9version>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-devtoolsartifactId>
            <scope>runtimescope>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>
project>

（3）写 YML

server:
  port: 80

spring:
  application:
    name: cloud-consumer-order
  cloud:
    #注册到zookeeper地址
    zookeeper:
      connect-string: 127.0.0.1:2181
      #connect-string: 192.168.111.144:2181

（4）主启动类

@SpringBootApplication
public class OrderZK80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderZK80.class,args);
    }
}

（5）业务类

配置 Bean

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

Controller

@RestController
public class OrderZKController {

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

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping(value = "/consumer/payment/zk")
    public String paymentInfo() {
        String result = restTemplate.getForObject(INVOKE_URL+"/payment/zk", String.class);
        System.out.println("消费者调用支付服务(zookeeper)--->result:" + result);
        return result;
    }
}

（6）验证测试

（7）访问测试地址

http://localhost/consumer/payment/zk

SpringCloud

II-第二章：（5）Zookeeper注册中心

一、注册中心Zookeeper

二、服务提供者

（1）新建cloud-provider-payment8004

（2）改 POM

（3）写 YML

（4）主启动类

（5）Controller

（6）启动8004注册进zookeeper

（7）测试

（8）思考

三、服务消费者

（1）新建cloud-consumerzk-order80

（2）改 POM

（3）写 YML

（4）主启动类

（5）业务类

（6）验证测试

（7）访问测试地址

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