发布时间:2023-07-01 08:30
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
1、支付服务注册进zookeeper
1.1 创建module cloud-provider-payment8004
1.2 引入zookeeper依赖,代替eureka
<?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>cloud2020</artifactId>
<groupId>com.atguigu.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>
<!--Springboot整合web组件-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--引入自定义的api通用包,可以使用payment支付Entity-->
<dependency>
<groupId>com.atguigu.springcloud</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
</project>
1.3 写application.yml
#8004表示注册到zookeeper服务器的支付服务提供者端口号
server:
port: 8004
#服务别名----注册zookeeper到注册中心名称
spring:
application:
name: cloud-provider-payment
cloud:
zookeeper:
connect-string: 192.168.88.131:2181
1.4主启动
package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
@EnableDiscoveryClient //该注解用于想使用consul或者zookeeper作为注册中心时注册服务
public class PaymentMain8004 {
public static void main(String[] args) {
SpringApplication.run(PaymentMain8004.class,args);
}
}
1.5业务类
package com.atguigu.springcloud.controller;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.UUID;
@RestController
@Slf4j
public class PaymentController {
@Value("${server.port}")
private String serverPort;
@GetMapping(value = "/payment/zk")
public String paymentzk(){
return "springcloud with zookeeper:"+serverPort+"\t"+ UUID.randomUUID().toString();
}
}
1.6 ./zkCli.sh启动客户端,然后启动8004注册进zookeeper
会发现启动类报错了,这是环境的问题。引入zookeeper依赖自带3.5.3 beta版,而我使用的是3.4.14,版本冲突了。
解决办法:修改pom依赖,排除3.5.3版本的,并引入3.4.14版本的
<!--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zookeeper3.4.14版本-->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.14</version>
</dependency>
PS: 新版本的zookeeper还会遇到slf4j和log4j包冲突的问题,此时在zookeeper去掉slf4j的依赖
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.14</version>
<exclusions>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
</exclusions>
</dependency>
这样,微服务提供者 支付模块就入驻进zookeeper服务器
1.7 验证测试
java程序在windows系统,服务注册中心在centos系统,说明程序调试成功。
继续深挖测试:
微服务作为一个znode节点放到zookeeper服务器上,这一大串就是在zookeeper上的基本信息的json串,就能看到zookeeper上8004微服务提供者的相关信息
zookeeper作为服务注册中心,微服务作为节点注册进来,那这个节点是临时还是持久?
关于Eureka我们知道,偶尔有一时刻服务提供者出了点故障,Eureka会开启自我保护机制,微服务不会被删除,那现在关闭8004试一下zookeeper中的服务会有什么变化吗
可以看出,Zookeeper也是在一定时间内,不会剔除服务,超时才剔除,所以zookeeper具备的服务节点是临时的。当你再启动8004时,zookeeper还会自动监听服务状态,但是流水号是一个新的流水号。
这与zookeeper的实现——监听机制有关,具另一篇博客有介绍:
https://blog.csdn.net/qq_41211642/article/details/104806959
2.订单服务注册进zookeeper
2.1 创建module cloud-consumerzk-order80
2.2 pom.xml
<?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>cloud2020</artifactId>
<groupId>com.atguigu.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>
<!--排除自带的zookeeper-->
<exclusions>
<exclusion>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--添加zookeeper3.4.14版本-->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.14</version>
<exclusions>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--springboot整合web组件-->
<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>
2.3 application.yml
server:
port: 80
spring:
application:
name: cloud-consumer-order
cloud:
#注册到zookeeper地址
zookeeper:
connect-string: 192.168.88.131:2181
2.4 主启动
package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
@EnableDiscoveryClient
public class OrderZKMain80 {
public static void main(String[] args) {
SpringApplication.run(OrderZKMain80.class,args);
}
}
2.5 业务类
//没讲ribbon前使用RestTemplate完成
package com.atguigu.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;
@Configuration
public class ApplicationContextConfig {
@Bean
@LoadBalanced
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
80服务controller代码:
package com.atguigu.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;
@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;
}
}