SpringCloud学习(10)-SpringCloudAlibaba-Nacos服务注册、配置中心

Spring Cloud Alibaba 参考文档

nacos下载Nacos 快速开始

直接进入bin包运行cmd命令：startup.cmd -m standalone

运行成功后通过http://localhost:8848/nacos进入nacos可视化页面，账号密码默认都是nacos

Nacos服务注册：以消费90、支付9001两个服务Demo为例

maven依赖：

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

配置文件application.yml

server:
  port: 9001
spring:
  application:
    name: nacos-pay-provider #以此名入驻服务注册中心
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 #Nacos服务注册中心地址

启动类、服务端controller



import cn.hutool.core.util.IdUtil;
import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.sunxiao.cloud.entities.PayDTO;
import com.sunxiao.cloud.util.Result;
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;

/**
 * @author sun
 * @date 2024/4/1
 */
@RestController
public class PayAlibabaController {

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

    @GetMapping("/pay/nacos/{id}")
    public String getPayInfo(@PathVariable("id") Integer id) {
        return "nacos registry serverPost: " + serverPort + ", id: " + id;
    }

    // openfeign和sentinel
    @GetMapping("/pay/nacos/get/{orderNo}")
    @SentinelResource(value = "getPayByOrderNo", blockHandler = "handlerBlockHandler")
    public Result<PayDTO> getPayByOrderNo(@PathVariable("orderNo") String orderNo) {
        // 模拟查询
        PayDTO payDTO = new PayDTO(1024, orderNo, "pay" + IdUtil.simpleUUID(), 1, BigDecimal.valueOf(9.9));
        return Result.success(payDTO);
    }

    public Result<PayDTO> handlerBlockHandler(String orderNo, BlockException e) {
        return Result.fail("服务提供者" + e.getMessage());
    }
}



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

/**
 * @author sunx
 * @date 2024/4/1
 */
@SpringBootApplication
@EnableDiscoveryClient
public class Main9001 {

    public static void main(String[] args) {
        SpringApplication.run(Main9001.class, args);
    }
}

调用端Controller及RestTemplateConfig



import com.sunxiao.cloud.apis.PayFeignSentinelApi;
import com.sunxiao.cloud.config.RestTemplateConfig;
import com.sunxiao.cloud.entities.PayDTO;
import com.sunxiao.cloud.util.Result;
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;

@RestController
public class OrderController {

    @Resource
    private RestTemplate restTemplate;

    @Resource
    private PayFeignSentinelApi payFeignSentinelApi;

    @Value("${service-url.nacos-user-service}")
    private String serverURL;

    @GetMapping("/order/pay/nacos/{id}")
    public String paymentInfo(@PathVariable("id") Integer id) {
        return restTemplate.getForObject(serverURL + "/pay/nacos/" + id, String.class);
    }

    @GetMapping("/consume/pay/nacos/get/{orderNo}")
    Result<PayDTO> getPayByOrderNo(@PathVariable("orderNo") String orderNo){
        return payFeignSentinelApi.getPayByOrderNo(orderNo);
    }

}


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 RestTemplateConfig {

    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

}

复制消费服务端：

启动90、9001、9002效果：

nacos服务列表，调用时自动实现负载均衡：

发起访问请求2次：

Nacos服务配置中心

maven依赖

 <!--bootstrap bootstrap.yaml-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bootstrap</artifactId>
        </dependency>
        <!--nacos-config nacos全局配置-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
                <!--nacos-discovery nacos 服务发现-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

配置文件bootstrap.yml。它的优先级高于application.yml

# nacos配置
spring:
  application:
    name: nacos-config-client #以此名入驻服务注册中心
  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: yml #指定yaml格式的配置
        #group: PROD_GROUP              #如果设置了groupid
        #namespace: Prod_Namespace    #如果设置了namespace

        # nacos端配置文件DataId的命名规则是：
        #    nacos-config-client                  dev                      yaml      ${spring.application.name}-${spring.profile.active}.${spring.cloud.nacos.config.file-extension}
        # 本案例的DataID是:nacos-config-client-dev.yaml

config:
  info: test

application.yml

server:
  port: 1234

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

启动类及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 sun
 * @date 2024/4/1
 */
@RestController
@RefreshScope // 支持动态刷新功能
public class NacosConfigClientController {

    @Value("${config.info}")
    private String configInfo;

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



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

/**
 * @author sunx
 * @date 2024/4/1
 */
@SpringBootApplication
@EnableDiscoveryClient
public class Main1234 {
    public static void main(String[] args) {
        SpringApplication.run(Main1234.class, args);
    }
}

nacos新建配置