四、SpringCloud学习笔记之Zookeeper服务注册与发现

Zookeeper服务注册与发现

Eureka停止更新了你怎么办：
https://github.com/Netflix/eureka/wiki

1、使用docker安装zookeeper

下载镜像：

docker pull zookeeper:3.4.9

启动容器并添加映射：

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

查看是否启动：

SpringCloud整合Zookeeper代替Eureka

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

服务提供者

建model》改pom》写yml》主启动
1、model

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>cloud</artifactId>
<groupId>com.liang.springcloud</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<artifactId>cloud-zkpayment-8003</artifactId>
<dependencies>

<dependency>
<groupId>com.liang.springcloud</groupId>
<artifactId>common</artifactId>
<version>${project.version}</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-zookeeper-discovery -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>

<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

</dependencies>

</project>

写yml：

server:
port: 8003
spring:
application:
name: cloud-provider-payment
cloud:
zookeeper:
connect-string: 192.168.0.6:2181

主启动：

package com.liang.cloud;

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

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

Controller：

package com.liang.cloud.controller;

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

import java.util.UUID;

@RestController
@Slf4j
public class PaymentController {

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

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

}

启动8003注册进zookeeper：
启动后问题

解决zookeeper版本jar包冲突问题：

修改pom：

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
<!--排除zk3.5.3-->
<exclusions>
<exclusion>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--添加zk 3.4,9版本-->
<!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.9</version>
</dependency>

访问
http://localhost:8003/payment/zk

验证测试：

连接

docker exec -it 53a  zkCli.sh

ls /

ls /service

这里node的名字就是yml配置的springapplication的名字

验证测试2：

ls /services/cloud-provider-payment

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

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

思考：
服务节点是临时节点还是持久节点

是临时节点。

服务消费者

model、pom、yml同上
配置RestTemplate：

package com.liang.cloud.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;

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

controller：

package com.liang.cloud.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;

@RestController
@Slf4j
public class OrderController {

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

@Resource
private RestTemplate restTemplate;

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

启动80注册进zookeeper

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