2.SpringCloud项目——nacos服务注册及配置中心

1.初始化项目

1.1.在gitee上新建项目

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1.2.在idea中导入项目

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1.1. 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.myspringcloud</groupId>
    <artifactId>myspringcloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>myspringcloud</name>
    <description>聚合服务</description>
    <packaging>pom</packaging>

   <!--将子项目放到聚合项目中-->
   <modules>
        <module>user-center</module>
   </modules>
</project>

1.2. .gitignore文件上传忽略文件

target/
pom.xml.tag
pom.xml.releaseBackup
pom.xml.versionsBackup
pom.xml.next
release.properties
dependency-reduced-pom.xml
buildNumber.properties
.mvn/timing.properties
.mvn/wrapper/maven-wrapper.jar

**/mvnw
**/mvnw.cmd
**/.mvn
**/target/
.idea
**/.gitignore

2.用户中心

2.1.新建module

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2.2.pom.xml

springboot版本和spring cloud alibaba的版本关系注意，避免踩坑，如果不符合要求，服务是无法注册到nacos中的，我这里用的是springboot 2.2.11，alibaba 是2.2.1.

<?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>2.2.11.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.myspringcloud</groupId>
    <artifactId>user-center</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>user-center</name>
    <description>用户中心</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud-alibaba.version>2.2.1.RELEASE</spring-cloud-alibaba.version>
        <spring-cloud.version>Hoxton.SR9</spring-cloud.version>
    </properties>

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

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

        <!--nacos服务注册与发现-->
         <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--nacos配置中心做配置管理的依赖-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <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>

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

2.3.bootstrap.yml (resources目录下)

server:
  port: 8080

#向nacos注册中心注册服务
spring:
  cloud:
    nacos:
      #配置nacos注册中心
      discovery:
        server-addr: localhost:8848
      #配置nacos配置中心
      config:
        file-extension: yaml
        server-addr: 127.0.0.1:8848
  #配置服务名
  application:
    name: user-center

  #通过以下名称匹配不同的开发和生产环境
  #如果不写则当前匹配 user-center.yaml
  #若写了则匹配 user-center-dev.yaml 或 user-center-dev.yaml
  profiles:
    active: dev #代表开发环境
    #active: pro #代表生产环境

2.4.启动项：UserCenterApplication

记得加 @EnableDiscoveryClient

package com.myspringcloud.usercenter;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@EnableDiscoveryClient
@SpringBootApplication
public class UserCenterApplication {

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

2.5.测试Controller

加上这个注解可以实时获取nacos上的配置信息@RefreshScope，否则项目一运行，你修改配置文件将不生效

package com.myspringcloud.usercenter.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RefreshScope
public class index {

    @Value("${server.port}")
    private String port;

    @Value("${test.message}")
    private String message;

    @RequestMapping("/index")
    public String index(){
        return "测试:"+message+"   端口号为："+port;
    }
}

2.6 nacos注册中心

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Data ID如何命名才能让项目默认匹配可以看下 2.3里的注解

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3.测试效果

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