springboot 之 nacos实现服务注册与发现，动态配置及实时更新配置

「爱情、让人受尽委屈。」 2022-11-11 13:18 337阅读 0赞

### 环境 ###

nacos版本: NACOS1.4.0  
具体怎么安装nacos，百度一下即可。

### 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 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>2.3.2.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.example</groupId>
        <artifactId>nacos</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>nacos</name>
        <description>Demo project for Spring Boot</description>
        <properties>
            <java.version>1.8</java.version>
            <spring-cloud-alibaba.version>2.2.5.RELEASE</spring-cloud-alibaba.version>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        </properties>
    
        <dependencyManagement>
            <dependencies>
                
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Hoxton.RELEASE</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>
                <version>${spring-cloud-alibaba.version}</version>
            </dependency>
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
                <version>${spring-cloud-alibaba.version}</version>
            </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>

### 本地配置 ###

spring:
      application:
        # 应用名称
        name: nacos-test
      cloud:
        nacos:
          config:
            # 设置配置中心服务端地址
            server-addr: 192.168.1.20:8848
            file-extension: yaml
            # 文件前缀
            prefix: test
            # 命名空间ID
            namespace: b53ece8f-3e05-473a-b141-e8d066ef3998
    
          discovery:
            # nacos注册中心地址
            server-addr: 192.168.1.20:8848
            namespace: b53ece8f-3e05-473a-b141-e8d066ef3998
            #register-enabled: false 只从注册中心获取服务而不将自己注册
    #开启包日志
    logging:
      level:
        com.example.nacos: debug
    #设置监听端口
    server:
      port: 8001

### 启动类 ###

@SpringBootApplication
    //开启服务发现
    @EnableDiscoveryClient
    public class NacosApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(NacosApplication.class, args);
        }
    
    }

### 相关类 ###

package com.example.nacos.config;
    
    import lombok.Data;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.cloud.context.config.annotation.RefreshScope;
    import org.springframework.context.annotation.Configuration;
    
    import java.io.Serializable;
    
    @Data
    @Configuration
    //添加这个配置就可以实时更新nacos的配置参数
    @RefreshScope
    public class CommonParameter implements Serializable { 
        @Value("${common.name}")
        private String name;
        @Value("${common.age}")
        private Integer age;
        @Value("${common.address}")
        private String address;
    }

### 测试类 ###

package com.example.nacos.controller;
    
    import com.example.nacos.config.CommonParameter;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class TestParameter { 
        @Autowired
        private CommonParameter commonParameter;
    
        @GetMapping("test")
        public String test(){ 
            String str = "name:"+commonParameter.getName()
                                + " age:"+commonParameter.getAge()
                                + " address:"+commonParameter.getAddress();
            return  str;
        }
    }

### nacos配置 ###

common: 
        name: zhangsan
        age: 444
        address: street 555

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTM5MTkxNTM_size_16_color_FFFFFF_t_70]

### 测试 ###

1.启动服务，查看nacos服务注册  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTM5MTkxNTM_size_16_color_FFFFFF_t_70 1]  
2.使用浏览器测试  
![在这里插入图片描述][20210320163517371.png]  
3.修改nacos配置，重新访问查看结果  
![在这里插入图片描述][20210320163624388.png]  
查看服务器日志，看到配置信息已经被拉取下来。  
浏览器访问：  
![在这里插入图片描述][20210320163658114.png]  
ok！至此，nacos的服务器注册与发现，动态配置及实时更新配置已经完成。  
over！

**前人少挖坑，后人少踩坑；前人记录，后人好踩坑；前人多种树，后人好乘凉**

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTM5MTkxNTM_size_16_color_FFFFFF_t_70]: /images/20221022/8bc7289e408849248f7f55f0a2f96879.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTM5MTkxNTM_size_16_color_FFFFFF_t_70 1]: /images/20221022/e07876677c644fee9140ff54543d6145.png
[20210320163517371.png]: /images/20221022/6a63c95cd6a24a5aa4255dfd6ca487cc.png
[20210320163624388.png]: https://img-blog.csdnimg.cn/20210320163624388.png
[20210320163658114.png]: https://img-blog.csdnimg.cn/20210320163658114.png