NACOS is a dynamic service discovery, configuration management and service management platform that is easier to build cloud primary applications. This time you come to experience NACOS and SpringBoot integration.

1, installation

Prerequisites: Install Docker, Docker-Compose, Git, if you don't have installed, please checkCoderQiPublic number article

• Clone project

  git clone https://github.com/nacos-group/nacos-docker.git
  // If the above address is slow, please use the following address.
  git clone https://gitee.com/amoqi/nacos-docker.git
  cd nacos-docker
  

The directory is as follows

.
├── build
│   ├── bin
│   ├── conf
│   ├── Dockerfile
│   └── init.d
├── changlog
├── env
│   ├── mysql.env
│   ├── nacos-embedded.env
│   ├── nacos-hostname.env
│   ├── nacos-ip.env
│   └── nacos-standlone-mysql.env
├── example
│   ├── cluster-embedded.yaml
│   ├── cluster-hostname.yaml
│   ├── cluster-ip.yaml
│   ├── init.d
│   ├── mysql
│   ├── prometheus
│   ├── standalone-derby.yaml
│   ├── standalone-logs
│   ├── standalone-mysql-5.7.yaml
│   └── standalone-mysql-8.yaml
├── README.md
└── README_ZH.md

Enter the command to modify the mirror version of the NACOS, now you need NACOS to set the mirror version to start.

vi example/standalone-mysql-5.7.yaml
 / / Modify one line below
image: nacos/nacos-server:${NACOS_VERSION}
 / / Change to the following version number, pay attention only to change the version number, the front space is not
image: nacos/nacos-server:1.4.2

Enter the following command to start

docker-compose -f example/standalone-mysql-5.7.yaml up -d

Enter the address after startup View:

http: // ip address: 8848 / NACOS /

2, use the configuration center

Create a springboot project Spring-boot-nacos, POM relies on the following

        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
		<!--nacos-->
        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>nacos-config-spring-boot-starter</artifactId>
            <version>${nacos-config-spring-boot.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>nacos-config-spring-boot-actuator</artifactId>
            <version>${nacos-config-spring-boot.version}</version>
        </dependency>
        

Configure Application.yml,server-addrAddress + IP for NACOS

spring:
  application:
    name: spirngboot-nacos
nacos:
  config:
    server-addr: 192.168.67.68:8848
management:
  endpoints:
    web:
      exposure:
        include: always
  endpoint:
    health:
      show-details: always

Enter the NACOS configuration, click on the list of the configuration, add a configuration, as shown

Add annotations on the startup fileNacosPropertySource

@SpringBootApplication
@NacosPropertySource(dataId = "example", autoRefreshed = true)
public class SpringBootNacosApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringBootNacosApplication.class, args);
    }
}

Create a configController.java file, as follows

@Controller
@RequestMapping("config")
public class ConfigController{

//    @Value("${useLocalCache:false}")
    @NacosValue(value = "${useLocalCache:false}",autoRefreshed = true)
    private boolean useLocalCache;

    @RequestMapping(value = "/get")
    @ResponseBody
    public boolean get() {
        return useLocalCache;
    }
}

Visithttp://localhost:8080/config/getWill show the value of UserCalcache

3, test NACOS modification configuration automatic effective

Enter NACOS, edit the Example file, modify false, as follows

useLocalCache:true

Visithttp://localhost:8080/config/getIt will show uselocalcache as a modified value.

Conclusion

The code word is not easy, I hope to support more. A four-year experience in work experience, currently engaged in the work of logistics industries, has its own small breaking website amoqi.cn. Welcome everyone to pay attention to the public number [CODERQI] to exchange Java knowledge, including but not limited to Springboot + micro service, there is more video, interview materials and professional books, etc. during the Qiqi learning process, I hope everyone can like it.