nacos config基本使用

说明

Nacos is an easy-to-use dynamic service discovery, configuration and service management platform for building cloud native applications.

Nacos是一个易于使用的动态服务发现、配置和服务管理平台，用于构建云本地应用程序。

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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.wzq.example</groupId>
    <artifactId>cloud_config</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cloud_config</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <spring.cloud.version>Hoxton.SR8</spring.cloud.version>
        <spring.cloud.alibaba.version>2.2.5.RELEASE</spring.cloud.alibaba.version>
        <spring.boot.version>2.2.5.RELEASE</spring.boot.version>
    </properties>

    <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>

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

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

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

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

主要关注:spring-cloud-starter-alibaba-nacos-config

application.properties

server.port=8083

bootstrap.properties(和application.properties同一目录下,创建)

# DataId By default, the `spring.application.name` configuration is combined with the file extension (the configuration format uses properties by default), and the GROUP is not configured to use DEFAULT_GROUP by default. Therefore, the Nacos Config configuration corresponding to the configuration file has a DataId of nacos-config.properties and a GROUP of DEFAULT_GROUP
spring.application.name=nacos-config

spring.cloud.nacos.config.server-addr=192.168.60.128:8848

# 指定nacos配置的后缀
spring.cloud.nacos.config.file-extension=yaml

# 启动动态刷新
spring.cloud.nacos.config.refresh-enabled=true

# If you need to use different configurations from different environments
# 同一环境:${spring.application.name}. ${file-extension:properties} 例: nacos-config.yaml
# 不同环境:${spring.application.name}-${profile}. ${file-extension:properties} 例: nacos-config-develop.yaml
spring.profiles.active=develop

启动类

package com.wzq.example.cloud_config;

import lombok.Getter;
import lombok.Setter;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.concurrent.TimeUnit;

@SpringBootApplication
public class CloudConfigApplication {

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


    /*public static void main(String[] args) throws InterruptedException {
        ConfigurableApplicationContext applicationContext = SpringApplication.run(CloudConfigApplication.class, args);
        while(true) {
            //When configurations are refreshed dynamically, they will be updated in the Enviroment, therefore here we retrieve configurations from Environment every other second.
            String userName = applicationContext.getEnvironment().getProperty("user.name");
            String userAge = applicationContext.getEnvironment().getProperty("user.age");
            System.err.println("user name :" + userName + "; age: " + userAge);
            TimeUnit.SECONDS.sleep(1);
        }
    }*/

    /*public static void main(String[] args) {
        ConfigurableApplicationContext applicationContext = SpringApplication.run(CloudConfigApplication.class, args);
        String userName = applicationContext.getEnvironment().getProperty("user.name");
        String userAge = applicationContext.getEnvironment().getProperty("user.age");
        System.err.println("user name :" +userName+"; age: "+userAge);
        //SpringApplication.run(CloudConfigApplication.class, args);
    }*/

}

自动配置test类

package com.wzq.example.cloud_config.controller;

import lombok.Getter;
import lombok.Setter;
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("${useLocalCache:false}")
    private boolean useLocalCache;

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

}

修改nacos中的配置 nacos-config-develop.yaml 就会自动刷新到 useLocalCache 变量中!