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2023-06(2)

Nacos的学习使用

发布于2021-06-12 14:47 阅读(160) 评论(0) 点赞(12) 收藏(0)

1Nacos作为服务注册中心

1.1基于Nacos的服务提供者

Module—>cloudalibaba-provider-payment9001
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>cloud1000</artifactId>
        <groupId>com.zs.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-provider-payment9001</artifactId>

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

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>
</project>

YML.xml

server:
  port: 9001
spring:
  application:
    name: nacos-payment-provider
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848

主启动类，添加注解 @EnableDiscoveryClient

package com.zs.cloudalibabaproviderpayment9001;

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

@SpringBootApplication
@EnableDiscoveryClient
public class CloudalibabaProviderPayment9001Application {

    public static void main(String[] args) {
        SpringApplication.run(CloudalibabaProviderPayment9001Application.class, args);
    }
}

业务类

package com.zs.cloudalibabaproviderpayment9001.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;

/**
 * @author zhaoshuai06 <zhaoshuai06@kuaishou.com>
 * Created on 2021-06-07
 */
@RestController
public class PaymentController {
    @Value("${server.port}")
    private String serverPort;

    @GetMapping(value = "/payment/nacos/{id}")
    public String getPayment(@PathVariable("id") Integer id) {
        return "nacos registry, serverPort: " + serverPort + "\t id" + id;
    }
}

测试
访问服务接口 http://localhost:9001/payment/nacos/1
查看 Nacos 控制台，服务列表
在这里插入图片描述
为了演示负载均衡，新建cloudalibaba-provider-payment9002

1.2基于Nacos的服务消费者

Module—>cloudalibaba-provider-payment9001
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>cloud1000</artifactId>
        <groupId>com.zs.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-consumer-nacos-order83</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

YML

server:
  port: 83
spring:
  application:
    name: nacos-order-consumer
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848

server-url:
  nacos-user-service: http://nacos-payment-provider

主启动类，添加注解 @EnableDiscoveryClient

package com.zs.cloudalibabaconsumernacosorder83;

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

@SpringBootApplication
@EnableDiscoveryClient
public class CloudalibabaConsumerNacosOrder83Application {

    public static void main(String[] args) {
        SpringApplication.run(CloudalibabaConsumerNacosOrder83Application.class, args);
    }
}

业务类

package com.zs.cloudalibabaconsumernacosorder83.controller;

import org.springframework.beans.factory.annotation.Autowired;
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;

/**
 * @author zhaoshuai06 <zhaoshuai06@kuaishou.com>
 * Created on 2021-06-08
 */
@RestController
public class OrdeNacosController {
    @Autowired
    private RestTemplate restTemplate;
    @Value("${server-url.nacos-user-service}")
    private String serverURL;

    @GetMapping(value = "/consumer/payment/nacos/{id}")
    public String paymentInfo(@PathVariable("id") Long id) {
        return restTemplate.getForObject(serverURL + "/payment/nacos/" + id, String.class);
    }
}

配置类

package com.zs.cloudalibabaconsumernacosorder83.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 zhaoshuai06 <zhaoshuai06@kuaishou.com>
 * Created on 2021-06-08
 */
@Configuration
public class ApplicationContextConfig {
    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate() {
        return new RestTemplate();
    }
}

测试

查看 Nacos 控制台，服务列表
在这里插入图片描述
访问服务接口 http://localhost:83/consumer/payment/nacos/13
83访问9001/9002，轮询负载OK

在这里插入图片描述

2Nacos作为服务配置中心

2.1Nacos作为配置中心-基础配置

Module—>cloudalibaba-config-nacos-client3377
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>cloud1000</artifactId>
        <groupId>com.zs.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-config-nacos-client3377</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!--nacos-config-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
        <!--nacos-discovery-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>
</project>

YML
在这里插入图片描述
bootstrap.yaml

spring:
  application:
    name: nacos-config-client
  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
server:
  port: 3377

application.yaml

spring:
  profiles:
    active: dev # 表示开发环境

主启动类，添加注解 @EnableDiscoveryClient

package com.zs.cloudalibabaconfignacosclient3377;

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

@SpringBootApplication
@EnableDiscoveryClient
public class CloudalibabaConfigNacosClient3377Application {

    public static void main(String[] args) {
        SpringApplication.run(CloudalibabaConfigNacosClient3377Application.class, args);
    }
}

业务类，添加注解 @RefreshScope，支持自动刷新

package com.zs.cloudalibabaconfignacosclient3377.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author zhaoshuai06 <zhaoshuai06@kuaishou.com>
 * Created on 2021-06-08
 */
@RestController
@RefreshScope //支持Nacos的动态刷新功能。
public class ConfigClientController {
    @Value("${config.info}")
    private String configInfo;

    @GetMapping("/config/info")
    public String getConfigInfo() {
        return configInfo;
    }
}

在 Nacos 中添加配置，nacos-config-client-dev.yaml，内容为

config:
    info: nacos config center,version = 2 from nacos config center, nacos-config-client-dev.yaml, version=3

在这里插入图片描述
注意Data Id的编辑测试：

测试
访问 http://localhost:3377/config/info
修改配置后，重新调用，测试自动刷新

2.2 Nacos作为配置中心-分类配置

在这里插入图片描述

DataID 方案
指定 spring.profile.active 和配置文件的 DataID 来使不同环境下读取不同的配置
Nacos 配置文件名称规则

${spring.application.name}-${spring.profile.active}.${spring.cloud.nacos.config.file-extension}

在这里插入图片描述

在这里插入图片描述

Group 方案
bootstrap.yaml 中指定 spring.cloud.nacos.config.group，对应 Nacos 中的 Group。

Namespace 方案
bootstrap.yml 中指定 spring.cloud.nacos.config.namespace，对应 Nacos 中的 Namespace 的 ID。

在这里插入图片描述

3Nacos集群和持久化配置（重要）

https://nacos.io/zh-cn/docs/cluster-mode-quick-start.html
在这里插入图片描述

3.1配置mysql数据库

单机模式支持mysql
在0.7版本之前，在单机模式时nacos使用嵌入式数据库实现数据的存储，不方便观察数据存储的基本情况。0.7版本增加了支持mysql数据源能力，具体的操作步骤：
1.安装数据库，版本要求：5.6.5+
2.初始化mysql数据库，数据库初始化文件：nacos-mysql.sql

/Users/zhaoshuai/softeware/nacos/conf/nacos-mysql.sql

3.修改conf/application.properties文件，增加支持mysql数据源配置（目前只支持mysql），添加mysql数据源的url、用户名和密码。

spring.datasource.platform=mysql

db.num=1
db.url.0=jdbc:mysql://11.162.196.16:3306/nacos_devtest?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true
db.user=nacos_devtest
db.password=youdontknow