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Spring Cloud Alibaba 参考文档

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 {@Resourceprivate RestTemplate restTemplate;@Resourceprivate 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@LoadBalancedpublic 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.yamlconfig:info: test

application.yml

server:port: 1234spring: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

测试效果：