02--创建一个工程并将其注册至nacos，并使用nacos配置

清疚 2022-12-22 01:00 101阅读 0赞

##### [nacos 环境搭建请参考][nacos] #####

1.  新建一maven项目spring-cloud-alibaba
2.  删除 spring-cloud-alibaba 项目中的 src文件
3.  pom.xml中引入springboot及springcloudalibab依赖

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>spring-cloud-alibaba</groupId>
        <artifactId>spring-cloud-alibaba</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <name>spring-cloud-alibaba</name>
        <url>http://www.xxx.xxx</url>
        <description>spring-cloud-alibaba</description>
    
        <properties>
            <java.version>1.8</java.version>
            <spring.cloud.version>Greenwich.SR6</spring.cloud.version>
        </properties>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.7.RELEASE</version>
        </parent>
    
    
        
        <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>2.1.0.RELEASE</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>
    
        <dependencies>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.2</version>
                <scope>provided</scope>
            </dependency>
        </dependencies>
        
        <build>
            <resources>
                <resource>
                    <directory>src/main/resources</directory>
                    <filtering>true</filtering>
                </resource>
            </resources>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <source>8</source>
                        <target>8</target>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>

1.  在spring-cloud-alibaba项目中新建producer-example模块
2.  producer-example 模块中引入nacos开发包

1.  producer-example模块中 java目录下新建开发目录 com.cloud.alibaba 并新建ProducerApplication启动类

package com.cloud.alibaba;
    
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.boot.CommandLineRunner;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    /** * @author 刘志强 * @date 2020/11/17 09:29 * @EnableDiscoveryClient 启动客户端 */
    @EnableDiscoveryClient
    @SpringBootApplication
    @Slf4j
    public class ProducerApplication implements CommandLineRunner { 
    
    
        public static void main(String[] args) { 
            SpringApplication.run(ProducerApplication.class, args);
        }
    
        @Override
        public void run(String... args) { 
            log.info("producer已启动");
        }
    }

1.  resources 目录下新建 bootstrap.yml 文件。
2.  bootstrap.yml和application.yml的区别。Bootstrap属性的优先级高，因此默认情况下不能被本地配置覆盖。
3.  bootstrap.yml

spring:
      application:
        name: producer-example
      profiles:
        active: dev
    
      main:
        allow-bean-definition-overriding: true
      cloud:
        nacos:
          discovery:
            # 服务注册地址
            server-addr: 101.37.152.195:8848
          config:
            server-addr: 101.37.152.195:8848
            # 配置文件格式
            file-extension: yml
            # 共享配置
            shared-dataids: application-${ spring.profiles.active}.${ spring.cloud.nacos.config.file-extension}

1.  服务启动 producer-example 服务会注册进nacos, 并读取nacos配置中的 producer-example-dev.yml,producer-example.yml 以及 application-dev.yml配置信息
2.  nacos配置如下

Data ID: producer-example-dev.yml
    Group：DEFAULT_GROUP
    配置格式：YAML
    配置内容：
    author:
        userName: 刘志强
        mailbox: 2425358736@qq.com
        
    
    Data ID: producer-example.yml
    Group：DEFAULT_GROUP
    配置格式：YAML
    配置内容：
    server:
      port: 10000
      
    
    Data ID: application-dev.yml
    Group：DEFAULT_GROUP
    配置格式：YAML
    配置内容：
    author:
        weChat: Liu19940528

1.  修改启动类 ProducerApplication，打印配置信息

package com.cloud.alibaba;
    
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.CommandLineRunner;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    import org.springframework.core.env.Environment;
    
    /** * @author 刘志强 * @date 2020/11/17 09:29 * @EnableDiscoveryClient 启动客户端 */
    @EnableDiscoveryClient
    @SpringBootApplication
    @Slf4j
    public class ProducerApplication implements CommandLineRunner { 
    
        @Autowired
        private Environment env;
    
        public static void main(String[] args) { 
            SpringApplication.run(ProducerApplication.class, args);
        }
    
        @Override
        public void run(String... args) { 
            log.info("producer已启动");
            log.info(env.getProperty("author.userName"));
            log.info(env.getProperty("author.mailbox"));
            log.info(env.getProperty("author.weChat"));
        }
    }

1.  启动项目 观察启动端口和打印信息是否来自nacos配置
2.  观察nacos服务列表是否已将producer-example 注册
3.  springcloud 默认支持热更新spring.cloud.refresh.enabled=true
4.  @RefreshScope 注解 刷新作用域。 新增Author类

package com.cloud.alibaba.domain;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.cloud.context.config.annotation.RefreshScope;
    import org.springframework.stereotype.Component;
    
    /** * @author 刘志强 * @date 2020/11/17 13:39 */
    @RefreshScope
    @Component
    public class Author { 
        @Value("${author.userName}")
        private String userName;
    
        @Value("${author.mailbox}")
        private String mailbox;
    
        @Value("${author.weChat}")
        private String weChat;
    
        @Override
        public String toString() { 
            return "Author{" +
                    "userName='" + userName + '\'' +
                    ", mailbox='" + mailbox + '\'' +
                    ", weChat='" + weChat + '\'' +
                    '}';
        }
    }

1.  修改启动类

package com.cloud.alibaba;
    
    import com.cloud.alibaba.domain.Author;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.CommandLineRunner;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /** * @author 刘志强 * @date 2020/11/17 09:29 * @EnableDiscoveryClient 启动客户端 */
    @EnableDiscoveryClient
    @SpringBootApplication
    @Slf4j
    @RestController
    public class ProducerApplication implements CommandLineRunner { 
    
        @Autowired
        private Author author;
    
        public static void main(String[] args) { 
            SpringApplication.run(ProducerApplication.class, args);
        }
    
        @Override
        public void run(String... args) { 
            log.info("producer已启动");
            log.info(author.toString());
        }
    
        @GetMapping("/test")
        public String test() { 
            return author.toString();
        }
    }

1.  启动后 修改配置 在访问test接口观察返回值

#### [源码地址][Link 1] ####

[nacos]: https://blog.csdn.net/lzq199528/article/details/109721844
[Link 1]: https://gitee.com/lzq199528/spring-cloud-alibaba