Spring Cloud进阶之路 | 二：服务提供者（discovery）

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作者：银河架构师

原文链接：https://www.cnblogs.com/luas/p/12073156.html

1 创建父项目

以前文所述，以spring boot 2.1.7.RELEASE为基，spring cloud版本为Greenwich.SR2，spring cloud alibaba版本为2.1.0.RELEASE。后续均以此为版本参照，不再赘述。

pom

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.luas.cloud</groupId>
    <artifactId>java-boot-parent-2.1</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <name>java-boot-parent-2.1</name>
    <description>Spring Cloud Learning, parent project by spring boot 2.1.x</description>

    <properties>
        <java.version>1.8</java.version>
        <hutool.version>4.6.13</hutool.version>
        <spring-cloud.version>Greenwich.SR2</spring-cloud.version>
        <spring-cloud-alibaba.version>2.1.0.RELEASE</spring-cloud-alibaba.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
        </dependency>

    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>cn.hutool</groupId>
                <artifactId>hutool-all</artifactId>
                <version>${hutool.version}</version>
            </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>

</project>

2 创建商品工程

pom

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>com.luas.cloud</groupId>
        <artifactId>java-boot-parent-2.1</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../../java-boot-parent-2.1</relativePath>
    </parent>

    <groupId>com.luas.cloud</groupId>
    <artifactId>xmall-product</artifactId>
    <version>1.0.0-SNAPSHOT</version>

    <name>xmall-product</name>
    <description>Spring Cloud Learning,nacos-client</description>

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

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

注意，父工程便是上一步创建的父项目，特别注意一下relativePath，不如特殊指定，需要将父工程deploy到maven私服，子工程才能正常引用。

application配置

server:
  port: 8080

spring:
  application:
    name: xmall-product
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848

注意，spring.application.name将作为xmall-product服务在nacos注册后的服务名称，该服务名称非常重要，后续无论是通过feign调用，还是rest调用，均需要此名称。

商品服务

package com.luas.cloud.controller;

import cn.hutool.core.map.MapUtil;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/sku")
public class SkuController {

    @RequestMapping("/{skuId}")
    public Object get(@PathVariable("skuId") String skuId) {
        return MapUtil.<String, Object>builder()
                .put("skuId", skuId)
                .put("name", "笔记本电脑")
                .put("price", 1199.00)
                .build();
    }

}

启动类

package com.luas.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class XmallProductApplication {

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

}