nacos的环境搭建以及微服务的注册

搭建nacos server

打开nacos官网: 按文档将服务器起来 默认帐号密码为nacos conf目录中有个application.yml文件中可以配置

将服务注册进nacos中

nacso server版本可以是是最新
根据: https://github.com/alibaba/spring-cloud-alibaba/wiki/%E7%89%88%E6%9C%AC%E8%AF%B4%E6%98%8E
导入spring cloud 版本和spring clou alibaba的版本
注意: import

然后将nacos client导入即可
之前调用其他服务一直报错原因是负载均衡没有导入
负载均衡一直没有导入的的原因是spring cloud dependencies scope没有设置为import

<?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">
    <modelVersion>4.0.0</modelVersion>
    <packaging>pom</packaging>
    <modules>
        <module>order</module>
        <module>product</module>
        <module>user</module>
        <module>stock</module>
        <module>shop-card</module>
    </modules>

    <parent>
        <artifactId>spring-boot-starter-parent</artifactId>
        <groupId>org.springframework.boot</groupId>
        <version>2.4.2</version>
    </parent>

    <groupId>com.lyra</groupId>
    <artifactId>shop-parent</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>

    <dependencies>

        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-loadbalancer -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
        </dependency>


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

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

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2021.1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>2020.0.1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

</project>

将服务注册到nacos 只需要在main类上添加@EnableDiscoveryClient 注解即可
在yml中配置nacos服务器的ip地址

server:
  port: 10000
spring:
  application:
    name: user-service

  cloud:
    nacos:
      server-addr: 10.0.4.3:8848

调用服务时和Netflix spring cloud 一直 只需要将LoadBalanced 注解添加到restTemplate上即可

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

然后根据服务名称进行调用

    @GetMapping("/order/create")
    public String createOrder(@RequestParam String userId, @RequestParam String productId) {
        String result = restTemplate.getForObject("http://stock-service/stock/reduce/" + productId, String.class);

        return result;
    }