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springcloud nacos的赋值均衡和动态刷新

2024-05-22 11:38:59 作者：健康平安的活着

nacos是一个分布式的配置中心和注册发现中心,这篇文章主要介绍了springcloud nacos的赋值均衡和动态刷新,需要的朋友可以参考下

一 nacos

1.1 nacos作用介绍

nacos是一个分布式的配置中心和注册发现中心。

nacos是 dynamic naming configuration service

nacos=config+bus 实现动态刷新；nacos=consul

1.2 各个注册中心对比

注册中心	CAP模型	控制台管理	社区活跃度
Eureaka	Ap	支持	低
zk	cp	不支持	中
consul	cp	支持	高
nacos	AP,和cp	支持	高

二 Nacos的安装

2.1 nacos的安装搭建

1.本次安装版本为2.2.3，下载软件包，进行解压启动，输入命令

E:\nacos-server2.2.3\bin>startup.cmd -m standalone

2.截图

3.访问地址

http://localhost:8848/nacos

三服务端的注册到Nacos

3.1 流程说明以及注意事项

1.客户端：ms-alibaba-provider8081

2.服务端：ms-alibaba-provider9091

3.注意事项：请求服务端的地址不能只写服务名称：ms-alibaba-provider9091，否则请求不成功

需要改成如下：http://ms-alibaba-provider9091

3.2 客户端配置

1.pom

<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">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.jurf.ms</groupId>
        <artifactId>mscloud-demo-2024</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <groupId>com.jurf.ms.alibaba.consumer8081</groupId>
    <artifactId>ms-alibaba-consumer-8081</artifactId>
    <packaging>jar</packaging>
    <name>ms-alibaba-consumer-8081</name>
    <url>http://maven.apache.org</url>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <!-- 引入自己定义的api通用包 -->
<!--        <dependency>-->
<!--            <groupId>com.jurf.ms.api</groupId>-->
<!--            <artifactId>ms-api-commons</artifactId>-->
<!--            <version>1.0-SNAPSHOT</version>-->
<!--        </dependency>-->
        <!--openfeign-->
<!--        <dependency>-->
<!--            <groupId>org.springframework.cloud</groupId>-->
<!--            <artifactId>spring-cloud-starter-openfeign</artifactId>-->
<!--        </dependency>-->
        <!--nacos-discovery-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--loadbalancer-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
        </dependency>
        <!--web + actuator-->
        <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>-->
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>
</project>

2.application配置

server:
  port: 8081
spring:
  application:
    name: ms-alibaba-consumer-8081
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
#消费者将要去访问的微服务名称(nacos微服务提供者叫什么你写什么)
service-url:
  nacos-user-service: http://ms-alibaba-provider9091

3.业务

a）controller

package com.jurf.ms.alibaba.consumer8081.controller;
import jakarta.annotation.Resource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
/**
 * @auther zzyy
 * @create 2024-01-01 15:43
 */
@RestController
public class OrderNacosController
{
    @Resource
    private RestTemplate restTemplate;
    @Value("${service-url.nacos-user-service}")
    private String serverURL;
    @GetMapping(value = "/consumer/pay/nacos/{id}")
    public String paymentInfo(@PathVariable("id") Integer id)
    {
        System.out.println("进来了要。。。。。");
       // String serverUrl="http://localhost:9091";
        String result = restTemplate.getForObject(serverURL + "/pay/nacos/"+id, String.class);
        return result+"\t"+"    我是OrderNacosController83调用者。。。。。。";
       // return "\t"+"    我是OrderNacosController83调用者。。。。。。";
    }
}

b)config

package com.jurf.ms.alibaba.consumer8081.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;
/**
 * @auther zzyy
 * @create 2024-01-01 15:42
 */
@Configuration
public class RestTemplateConfig
{
    @Bean
    @LoadBalanced //赋予RestTemplate负载均衡的能力
    public RestTemplate restTemplate()
    {
        return new RestTemplate();
    }
}

4.启动类

package com.jurf.ms.alibaba.consumer8081;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
/**
 * Hello world!
 *
 */
@EnableDiscoveryClient
@SpringBootApplication
public class App8081
{
    public static void main( String[] args )
    {
        SpringApplication.run(App8081.class,args);
        System.out.println( "Hello World!" );
    }
}

3.3 服务端

1.pom

<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">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.jurf.ms</groupId>
        <artifactId>mscloud-demo-2024</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <groupId>com.jurf.ms.alibaba.provider9091</groupId>
    <artifactId>ms-alibaba-provider-9091</artifactId>
    <packaging>jar</packaging>
    <name>ms-alibaba-provider-9091</name>
    <url>http://maven.apache.org</url>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <!--nacos-discovery-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--web + actuator-->
        <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>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>
</project>

2.application配置

server:
  port: 9091
spring:
  application:
    name: ms-alibaba-provider9091
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848

3.业务

package com.jurf.ms.alibaba.provider9091.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import java.math.BigDecimal;
/**
 * @auther zzyy
 * @create 2024-01-01 15:31
 */
@RestController
public class PayAlibabaController
{
    @Value("${server.port}")
    private String serverPort;
    @GetMapping(value = "/pay/nacos/{id}")
    public String getPayInfo(@PathVariable("id") Integer id)
    {
        return "nacos registry, serverPort: "+ serverPort+"\t id"+id;
    }
}

4.启动类

package com.jurf.ms.alibaba.provider9091;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
/**
 * Hello world!
 *
 */
@EnableDiscoveryClient
@SpringBootApplication
public class Nacos9091App
{
    public static void main( String[] args )
    {
        SpringApplication.run(Nacos9091App.class,args);
        System.out.println( "Hello World!" );
    }
}

3.4 调试

1启动服务

2.调试：http://localhost:8081/consumer/pay/nacos/456

四 nacos模拟负载均衡

4.1 模拟操作

1.在服务9091的基础上，复制一份服务

2.进行配置：配置端口为：9092，在vm parmater参数项配置如下：-DServer.port=9092

3.进行启动

1.查看nacos

2.查看

3.动态不停刷新访问

提供服务为9091

提供服务为9092

五 nacos的动态刷新

5.1 动态刷新配置逻辑

1.配置规则：

2.配置对应关系

5.2 配置操作

5.2.1 pom配置文件

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bootstrap</artifactId>
        </dependency>
        <!--nacos-config-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>

5.2.2 修改bootstrap和application配置文件

1.bootstrap配置文件

# nacos配置
spring:
  application:
    name:  ms-alibaba-consumer-8081
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 #Nacos服务注册中心地址
      config:
        server-addr: localhost:8848 #Nacos作为配置中心地址
        file-extension: yaml #指定yaml格式的配置
#        group: DEFAULT_GROUP
#        namespace: c364e76c-e133-4bc0-951e-205cf732a19f
# nacos端配置文件DataId的命名规则是：
# ${spring.application.name}-${spring.profiles.active}.${spring.cloud.nacos.config.file-extension}
# 本案例的DataID是:nacos-config-client-dev.yaml  nacos-config-client-test.yaml

2.application配置文件

server:
  port: 8081
app:
  appid: 94933
spring:
  profiles:
    #active: dev # 表示开发环境
    active: prod # 表示生产环境
    #active: test # 表示测试环境
#消费者将要去访问的微服务名称(nacos微服务提供者叫什么你写什么)
service-url:
  nacos-user-service: http://ms-alibaba-provider9091