整合nacos

 一、项目结构small-shop为父工程，order(订单服务)、stock(库存服务)

 二、父工程pom.xml文件，添加基础依赖，控制版本

    <modules>
        <module>order</module>
        <module>stock</module>
    </modules>

    <properties>
        <spring-boot.version>2.3.12.RELEASE</spring-boot.version>
        <spring-cloud.version>Hoxton.SR12</spring-cloud.version>
        <spring-cloud-alibaba.version>2.2.9.RELEASE</spring-cloud-alibaba.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

三、stock模块（打算使用order模块调用stock模块）

3.1、pom.xml

<?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>small-shop</artifactId>
        <groupId>com.xice.shop</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>stock</artifactId>

    <dependencies>
        <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>
</project>

3.2、application.yml配置文件

server:
  port: 8081  #服务端口
spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848  #nacos服务地址
  application:
    name: stock-server #服务命称

3.3、服务代码

@RestController
@RequestMapping("stock")
public class StockController {

    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    /**
     * 无参数
     * @return
     */
    @RequestMapping("reduce")
    public String reduce(){
        return "库存减一 "+dateFormat.format(new Date());
    }

    /**
     * 多个参数
     * @param orderId
     * @return
     */
    @RequestMapping("reduce1")
    public String reduce1(@RequestParam("orderId")String orderId){
        return "orderId="+orderId+",库存减一 "+dateFormat.format(new Date());
    }

    /**
     * 参数为map
     * @param map
     * @return
     */
    @RequestMapping("reduce2")
    public String reduce2(@RequestBody Map map){
        return "orderId="+map.get("orderId")+",库存减一 "+dateFormat.format(new Date());
    }
}

四、order模块

4.1、pom依赖与stock引入的一样

4.2、application.yml配置文件

server:
  port: 8080  #服务端口
spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848  #nacos服务地址
  application:
    name: order-server #服务命称

4.3、初始化RestTemplate，需要添加 @LoadBalanced 注解，配置负载均衡策略

@Configuration
public class RestTemplateConfig {

    @Bean
    @LoadBalanced
    public RestTemplate restTemplate(RestTemplateBuilder builder){
        return builder.build();
    }
}

4.4、使用RestTemplate调用stock服务

@RestController
@RequestMapping("order")
public class OrderController {
    @Autowired
    RestTemplate restTemplate;

    @RequestMapping("add")
    public String add(){
        String result = restTemplate.getForObject("http://stock-server/stock/reduce", String.class);
        String result1 = restTemplate.getForObject("http://stock-server/stock/reduce1?orderId={1}", String.class,"100");
        Map map = new HashMap();
        map.put("orderId",100);
        String result2 = restTemplate.getForObject("http://stock-server/stock/reduce1?orderId={orderId}",String.class, map);
        String result3 = restTemplate.postForObject("http://stock-server/stock/reduce2", map,String.class);

        return result+"----"+result1+"----"+result2+"----"+result3;
    }
}

五、启动两个服务可以在nacos中看到两个服务注册成功

 六、访问http://localhost:8080/order/add