[micro service ~nacos] configuration center of Nacos

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Column introduction

【 Microservices ~Nacos】 At present, it mainly updates micro services , Learn together and progress together .

Introduction to this issue

This issue mainly introduces micro services ~Nacos

List of articles

Build services

Create services

Query service

How much do you know about integration

nacos Profile load order

Build services

• Project name ：nacos-config-2.1

Add coordinates ：

<dependencies>
        <!-- web  starter  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    
    	<!-- nacos  Service discovery  -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    
		<!-- nacos  To configure -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>


    </dependencies>

•   establish yml The configuration file ：bootstrap.yml

server:
  port: 8072                          #  Port number 
spring:
  application:
    name: config-service              #  service name 
  cloud:
    nacos:
      config:
        server-addr: 127.0.0.1:8848   		# nacos  Service address 
        prefix: ${spring.application.name}	#data ID The prefix of , Default service name 
        file-extension: yaml          		# data ID The suffix ：config-service.yaml
        group: DEFAULT_GROUP         		#  Group name 
      discovery:
      server-addr: 127.0.0.1:8848   #nacos Service address 

Create services

• Write the startup class

package com.czxy.nacos;

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


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

•   Write processing class

package com.czxy.nacos.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
@RequestMapping("/config")
@RefreshScope
public class ConfigController {

    @Value("${czxy.message:' The default value is '}")
    private String msg;

    /**
     * http://localhost:8072/config/get
     */
    @RequestMapping("/get")
    public String get() {
        return msg;
    }
}

Query service

• situation 1, visit “ Default data ”

 http://localhost:8072/config/get

• situation 2, visit yml File configuration information  

czxy:
 message:  Test data 

• situation 3： visit nacos Configuration data in

How much do you know about integration

• stay Nacos Spring Cloud in ,dataId The complete format is as follows

${prefix}-${spring.profile.active}.${file-extension}

Show profile Data in

• 1） To write profile：application-demo.yml

server:
  port: 8073                          #  Port number 
czxy:
  message: demo data 

 2） Modify the boot entry

-Dspring.profiles.active=demo

3） Delete nacos After the configuration , test

nacos The default configuration

• 1）nacos To configure config-service.yaml Of Data ID

2） test

nacos To configure profile

• 1） To configure nacos profile ：config-service-demo.yaml

2） test  

nacos Profile load order

spring boot、nacos Loading order of various configuration files

1.bootstrap.yml

2.application.yml

3.application-[profile].yml

4.[serviceName].yml #nacos To configure

5.[serviceName]-[profile].yml #nacos To configure

• Files loaded later , The configuration contents of the previous file will be overwritten