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Spring Cloud Alibaba-（2）Nacos【服务注册与发现、配置管理】

news 2024/9/22 16:45:32

Spring Cloud Alibaba-（1）搭建项目环境

Spring Cloud Alibaba-（2）Nacos【服务注册与发现、配置管理】

Spring Cloud Alibaba-（3）OpenFeign【服务调用】

Spring Cloud Alibaba-（4）Sentinel【流控和降级】

Spring Cloud Alibaba-（5）Seata【分布式事务】

1.Nacos 官网-https://nacos.io/

2.下载对应版本的Nacos

3.必须使用 bootstrap.yml 配置 nacos

3.1 订单微服务 bootstrap.yml 配置 nacos

server:port: 8000spring:application:name: orders-servicedatasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/springcloud2024username: ***password: ***cloud:nacos:discovery:server-addr: http://localhost:8848config:server-addr: http://localhost:8848

3.2 产品微服务 bootstrap.yml 配置 nacos

server:port: 8400spring:application:name: orders-servicedatasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/springcloud2024username: ***password: ***cloud:nacos:discovery:server-addr: http://localhost:8848config:server-addr: http://localhost:8848

3.3 用户微服务 bootstrap.yml 配置 nacos

server:port: 8300spring:application:name: orders-servicedatasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/springcloud2024username: ***password: ***cloud:nacos:discovery:server-addr: http://localhost:8848config:server-addr: http://localhost:8848

4. 订单、产品、用户微服务 pom.xml 引入依赖

<!-- nacos-discovery 服务注册与发现 -->
<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency><!-- nacos-config 配置中心 -->
<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>

5.standalone 模式启动 Nacos

6.启动微服务，会自动将微服务注册到Nacos

7.进入Nacos-DashBoard查看（http://localhost:8848/nacos）

8.Nacos 配置管理

8.1 Nacos 使用 mysql 持久化，配置完成后重启Nacos

8.2 Nacos 配置默认是Properties格式，如果使用yaml格式，要在bootstrap配置

8.2.1 Nacos创建2个配置文件

8.2.2 bootstrap.yml 配置

8.3 @Value 注解获取Nacos配置值，@RefreshScope 动态刷新获取Nacos修改的配置值

package com.dragon.controller;import cn.dev33.satoken.util.SaResult;
import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.dragon.openfeign.ProductServiceFeign;
import com.dragon.service.IOrdersService;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.*;@Tag(name = "订单微服务")
@Slf4j
@RefreshScope
@RestController
@RequestMapping("/order")
public class OrdersController {@Autowiredprivate IOrdersService ordersService;@Qualifier("com.dragon.openfeign.ProductServiceFeign")@Autowiredprivate ProductServiceFeign productServiceFeign;@Value("${env.name}")private String envName;@Operation(summary = "获取 Nacos 配置值")@GetMapping("/config")public String config(){return envName;}@Operation(summary = "下单")@PostMapping("/add/{productId}")public SaResult add(@PathVariable("productId") String productId){return ordersService.add(productId);}@Operation(summary = "测试调用产品的 test() 出现异常")@GetMapping("/test")public SaResult test(){return productServiceFeign.test();}//    /**
//     *  热点规则，必须使用 @SentinelResource，
//     *  @SentinelResource 优先级高于全局流控异常处理器
//     */
//    @GetMapping("/get/{id}")
//    @SentinelResource(value = "getById",blockHandler = "hotBlockHandler")
//    public String getById(@PathVariable("id") String id){
//        return "正常访问";
//    }
//
//    public String hotBlockHandler(@PathVariable("id") String id,BlockException e){
//        return "热点异常处理器";
//    }}