SpringCloud-Alibaba之Nacos服务注册中心

学习SpringCloud的日常Demo

Springcloud-Alibaba组件基本介绍

Springcloud-Alibaba官网

• 服务限流降级: 默认支持Servlet. Feign. RestTemplate、 Dubbo 和RocketMQ限流降级功能的接入，可以在运行时通过控制台实时修改限流降级规则，还支持查看限流降级Metrics监控。
• 服务注册与发现: 适配Spring Cloud服务注册与发现标准,默认集成了Ribbon的支持。
• 分布式配置管理: 支持分布式系统中的外部化配置，配置更改时自动刷新。
• 消息驱动能力: Spring Cloud Stream为微服务应用构建消息驱动能力。阿里云对象存储:阿里云提供的海量、安全、低成本、可靠的云存储服务。支持在任何应用、任何时间、任何地点存储和访问任意类型的数据。
• 分布式任务调度: 提供秒级、精准、可靠可用的定时(基于Cron表达式)任务调度服务。同时提供分布式的任务执行模型，如网格任务。网格任务支持海量子任务均匀分配到所有Worker (schedulerx- client). 上执行。
• **阿里云对象存储：**阿里云提供的海量、安全、低成本、高可靠的云存储服务。支持在任何应用、任何时间、任何地点存储和访问任意类型的数据。
• **阿里云短信服务：**覆盖全球的短信服务，友好、高效、智能的互联化通讯能力，帮助企业迅速搭建客户触达通道。

启动Nacos

cloudalibaba-provider-payment9001模块构建

目录结构

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>cloud2020</artifactId>
        <groupId>com.mineok.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.mineok.springcloud</groupId>
    <artifactId>cloudalibaba-provider-payment9001</artifactId>
    <dependencies>
        <!--SpringCloud ailibaba nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </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-starter-actuator</artifactId>
        </dependency>
        <!--日常通用jar包配置-->
        <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>

application.yml

server:
  port: 9001

spring:
  application:
    name: nacos-payment-provider
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 #配置Nacos地址

management:
  endpoints:
    web:
      exposure:
        include: '*'     #监控

主启动类

@EnableDiscoveryClient
@SpringBootApplication
public class PaymentMain9001 {
     
    public static void main(String[] args) {
     
        SpringApplication.run(PaymentMain9001.class, args);
    }
}

Controller

@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;
    }
}

注:cloudalibaba-provider-payment9002模块构建步骤同上,不再赘述

测试

9002也注册进去

cloudalibaba-consumer-nacos-order83模块构建

目录结构

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>cloud2020</artifactId>
        <groupId>com.mineok.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.mineok.springcloud</groupId>
    <artifactId>cloudalibaba-consumer-nacos-order83</artifactId>

    <dependencies>
        <!--SpringCloud ailibaba nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
        <dependency>
            <groupId>com.mineok.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${
     project.version}</version>
        </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-starter-actuator</artifactId>
        </dependency>
        <!--日常通用jar包配置-->
        <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>

application.yml

server:
  port: 83

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

#消费者将要去访问的微服务名称(注册成功进nacos的微服务提供者)
service-url:
  nacos-user-service: http://nacos-payment-provider

主启动类

@EnableDiscoveryClient
@SpringBootApplication
public class OrderNacosMain83 {
     
    public static void main(String[] args) {
     
        SpringApplication.run(OrderNacosMain83.class, args);
    }
}

Nacos天生支持负载均衡(集成了Ribbon)

因此采用RestTemplate+Ribbon调用Payment9001,9002集群服务

Config

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

Controller

@RestController
@Slf4j
public class OrderNacosController {
     
    @Resource
    private RestTemplate restTemplate;

    // 从yml中读取service-url配置
    @Value("${service-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);
    }

}

测试

注册中心小结

GitHub:SpringCloud日常Demo