Spring Cloud (4): registro e descoberta do serviço Zookeeper

1. Registro e descoberta do serviço Zookeeper

1.1 Instale o zookeeper usando o docker

Verifique este blog para o tutorial de instalação do docker : tutorial de instalação do docker

• Baixar espelho

docker pull zookeeper:3.4.9

• Inicie o contêiner e adicione o mapeamento:

docker run --privileged=true -d --name zookeeper --publish 2181:2181  -d zookeeper:3.4.9

• Verifique se está ativado
  

1.2 SpringCloud integra Zookeeper em vez de Eureka

Zookeeper é uma ferramenta de coordenação distribuída que pode realizar a função de registro.
Desligue o firewall do servidor Linux e inicie o servidor zookeeper. O
servidor Zookeeper substitui o servidor Eureka e zk serve como o registro de serviço.

provedor de serviço

• Crie um novo módulo cloud-provider-payment8004
• Mudar 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>spring-cloud-demo</artifactId>
        <groupId>com.lele.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-provider-payment8004</artifactId>

    <dependencies>
        <!-- SpringBoot 整合 zookeeper 客户端-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        </dependency>
        <!-- 引入自定义的api通用包，可以使用Payment支付Entity -->
        <dependency>
            <groupId>com.lele.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
<!--        <dependency>-->
<!--            <groupId>org.springframework.boot</groupId>-->
<!--            <artifactId>spring-boot-starter-actuator</artifactId>-->
<!--        </dependency>-->
<!--        <dependency>-->
<!--            <groupId>org.mybatis.spring.boot</groupId>-->
<!--            <artifactId>mybatis-spring-boot-starter</artifactId>-->
<!--        </dependency>-->
<!--        <dependency>-->
<!--            <groupId>com.alibaba</groupId>-->
<!--            <artifactId>druid-spring-boot-starter</artifactId>-->
<!--            <version>1.1.10</version>-->
<!--        </dependency>-->
<!--        <dependency>-->
<!--            <groupId>mysql</groupId>-->
<!--            <artifactId>mysql-connector-java</artifactId>-->
<!--        </dependency>-->
<!--        <dependency>-->
<!--            <groupId>org.springframework.boot</groupId>-->
<!--            <artifactId>spring-boot-starter-jdbc</artifactId>-->
<!--        </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>

</project>

• L 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: localhost:2181  #zookeeper所在的主机ip地址

• Aula inicial principal

package com.lele.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * @author: lele
 * @date: 2021/3/9 22:24
 * @description:
 */
@SpringBootApplication
@EnableDiscoveryClient
public class PaymentMain8004 {
    
    
    public static void main(String[] args) {
    
    
        SpringApplication.run(PaymentMain8004.class, args);
    }
}

• Controlador

package com.lele.springcloud.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.UUID;

/**
 * @author: lele
 * @date: 2021/3/10 7:00
 * @description:
 */
@RestController
@Slf4j
public class PaymentController {
    
    

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

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

• Comece 8004 para se registrar no zookeeper
  

• Resolva o problema do conflito do pacote jar da versão do zookeeper
  

• Modificar pom

<!-- 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>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

• 访问 ： http: // localhost: 8003 / payment / zk
  
• Teste de verificação:

docker exec -it 容器id /bin/bash
cd bin/
zkCli.sh

ls /
ls /services

Aqui, o nome do nó é o nome do springapplication configurado pelo yml

• Teste de verificação 2:

ls /services/cloud-provider-payment

get /services/cloud-provider-payment/a855f6d9-cb61-478e-919d-660d62e9f951

Pensando: o
nó de serviço é um nó temporário ou um nó persistente:

É um nó temporário.

Consumidor de serviço

• Novo módulo cloud-consumerzk-order80
• Mudar 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>spring-cloud-demo</artifactId>
        <groupId>com.lele.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-consumerzk-order80</artifactId>

    <dependencies>
        <!-- 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>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- 引入自定义的api通用包，可以使用Payment支付Entity -->
        <dependency>
            <groupId>com.lele.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </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>

</project>

• marga

server:
  port: 80

spring:
  application:
    name: cloud-consumer-order
  cloud:
  #注册到zookeeper地址
    zookeeper:
      connect-string: localhost:2181  #zookeeper所在的主机ip地址

• Aula inicial principal

package com.lele.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * @author: lele
 * @date: 2021/3/10 22:16
 * @description:
 */
@SpringBootApplication
@EnableDiscoveryClient
public class OrderZKMain80 {
    
    
    public static void main(String[] args) {
    
    
        SpringApplication.run(OrderZKMain80.class, args);
    }
}

• Configure RestTemplate:

package com.lele.springcloud.config;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

/**
 * @author: lele
 * @date: 2021/3/10 22:21
 * @description:
 */
@Configuration
public class ApplicationContextConfig {
    
    
    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate() {
    
    
        return new RestTemplate();
    }
}

• controlador

package com.lele.springcloud.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * @author: lele
 * @date: 2021/3/10 22:26
 * @description:
 */
@RestController
@Slf4j
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;
    }
}

Comece 80 para se registrar no zookeeper

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