Spring Cloud进阶之路 | 二：服务提供者（discovery）

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>4.0.0modelVersion>

    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.1.7.RELEASEversion>
        <relativePath/> 
    parent>

    <groupId>com.luas.cloudgroupId>
    <artifactId>java-boot-parent-2.1artifactId>
    <version>1.0.0-SNAPSHOTversion>
    <packaging>pompackaging>

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

    <properties>
        <java.version>1.8java.version>
        <hutool.version>4.6.13hutool.version>
        <spring-cloud.version>Greenwich.SR2spring-cloud.version>
        <spring-cloud-alibaba.version>2.1.0.RELEASEspring-cloud-alibaba.version>
    properties>

    <dependencies>
        <dependency>
            <groupId>cn.hutoolgroupId>
            <artifactId>hutool-allartifactId>
        dependency>

    dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>cn.hutoolgroupId>
                <artifactId>hutool-allartifactId>
                <version>${hutool.version}version>
            dependency>

            <dependency>
                <groupId>org.springframework.cloudgroupId>
                <artifactId>spring-cloud-dependenciesartifactId>
                <version>${spring-cloud.version}version>
                <type>pomtype>
                <scope>importscope>
            dependency>

            <dependency>
                <groupId>com.alibaba.cloudgroupId>
                <artifactId>spring-cloud-alibaba-dependenciesartifactId>
                <version>${spring-cloud-alibaba.version}version>
                <type>pomtype>
                <scope>importscope>
            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>4.0.0modelVersion>

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

    <groupId>com.luas.cloudgroupId>
    <artifactId>xmall-productartifactId>
    <version>1.0.0-SNAPSHOTversion>

    <name>xmall-productname>
    <description>Spring Cloud Learning,nacos-clientdescription>

    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>

        
        <dependency>
            <groupId>com.alibaba.cloudgroupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discoveryartifactId>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            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.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);
    }

}

 

 

关于@EnableDiscoveryClient注解，此处并没有添加，而服务依然能正常注册到nacos。什么原因呢？看如下两段代码即可明了：

 

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此3处重要逻辑，均不依赖于是否配置了开启参数，所以会自动注册并监听。

 

Nacos服务列表

 

打开nacos控制台，发现访问已然在列表中，注册成功！

 

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可以点击详情查看服务元数据

 

访问

 

访问http://localhost:8080/sku/1000000，得出现如下结果：

 

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源码

 

欢迎点赞

 

1. github：https://gitee.com/xbd521/SpringCloudLearning
2. gitee: https://github.com/liuminglei/SpringCloudLearning

 

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