SpringBoot集成Nacos做动态配置中心-不重启服务
SpringBoot集成Nacos做动态配置中心-不重启服务
Nacos 致力于帮助您发现、配置和管理微服务。Nacos 提供了一组简单易用的特性集，帮助您快速实现动态服务发现、服务配置、服务元数据及流量管理。他也可以作为动态配置中心来使用。下面我就当它是动态配置中心，做一个demo
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Nacos
如果此文章表述的不清晰可以参考官方的文档：https://nacos.io/zh-cn/docs/quick-start-spring-boot.html
下载Nacos的服务端版本
下载地址：nacos-server-1.4.1.zip 具体下载地址自行百度。github能下不过有点慢。
本应用主要在Windows 10上测试
然后解压
到nacos的bin目录下执行cmd命令行(此为测试，主要是单例启动)
startup.cmd -m standalone
新建一个Springboot的Maven项目如图
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>
<groupId>com.hainan.www</groupId>
<artifactId>SpringBoot-Nacos</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>SpringBoot-Nacos</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<spring-boot.version>2.3.7.RELEASE</spring-boot.version>
<latest.version>0.2.7</latest.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.alibaba.boot</groupId>
<artifactId>nacos-config-spring-boot-starter</artifactId>
<version>${latest.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.3.7.RELEASE</version>
<configuration>
<mainClass>com.hainan.www.SpringBootNacos.SpringBootNacosApplication</mainClass>
</configuration>
<executions>
<execution>
<id>repackage</id>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
SpringBootNacosApplication.java
package com.hainan.www;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import com.alibaba.nacos.spring.context.annotation.config.NacosPropertySource;
@SpringBootApplication
@NacosPropertySource(dataId = "haiguan", autoRefreshed = true)
@NacosPropertySource(dataId = "redis", autoRefreshed = true)
public class SpringBootNacosApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootNacosApplication.class, args);
}
}
ConfigController.java
package com.hainan.www.web;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import com.alibaba.nacos.api.config.annotation.NacosValue;
@RequestMapping("config")
@RestController
public class ConfigController {
@NacosValue(value = "${useLocalCache:false}", autoRefreshed = true)
private boolean useLocalCache;
// 该方法是获取nacos服务端配置的dataCode编码，如果未配置该字段默认2021010，支持自动刷新
@NacosValue(value = "${dataCode:2021010}", autoRefreshed = true)
private String dataCode;
@NacosValue(value = "${redisPort:6673}", autoRefreshed = true)
private String redisPort;
@NacosValue(value = "${spring.qq.name:6673}", autoRefreshed = true)
private String springApplicationName;
@NacosValue(value = "${spring.redis.host:6673}", autoRefreshed = true)
private String springRedisHost;
@GetMapping("/get")
@ResponseBody
public boolean get() {
System.out.println("useLocalCache==>" + useLocalCache);
System.out.println("dataCode=>>>>>>" + dataCode);
System.out.println("redisPort=>>>>>>" + redisPort);
System.out.println("springApplicationName=>>>>>>" + springApplicationName);
System.out.println("springRedisHost=>>>>>>" + springRedisHost);
return useLocalCache;
}
}
application.yml
spring:
application:
name: SpringBoot-Nacos
nacos:
config:
server-addr: 127.0.0.1:8848
首先确定nacos-server已经启动
然后启动Springboot项目
配置nacos-server端
登录地址如下：http://127.0.0.1:8848/ nacos/nacos
如此配置然后调用springboot的get方法
地址：
http://localhost:8080/config/get
看控制台打印信息如下：
useLocalCache==>true
dataCode=>>>>>>20210204
redisPort=>>>>>>6379
springApplicationName=>>>>>>SpringBoot-sss
springRedisHost=>>>>>>127.0.0.1:6379
主要注意的问题是：
nacos如果默认直接启动，使用的是其自带的derby数据库；如果想使用mysql数据库则需要到nacos-server-1.4.1.zip解压缩包下的conf下把下列注解解开
如果mysql是8.0版本的话，使用官网文档会报错需要在db.url.0=**********&allowPublicKeyRetrieval=true 加上&allowPublicKeyRetrieval=true
#*************** Config Module Related Configurations ***************#
### If use MySQL as datasource:
spring.datasource.platform=mysql
### Count of DB:
db.num=1
### Connect URL of DB:
db.url.0=jdbc:mysql://127.0.0.1:3306/nacos?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useUnicode=true&useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true
db.user.0=root
db.password.0=root
同时把conf目录下的nacos-mysql.sql导入到mysql数据库中
这样就可以动态修改配置内容了，而且不用重启服务
Nacos对yaml格式解析不是特别好，注意使用yaml的配置格式容易获取不到对应的内容
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