nacos-springboot配置中心使用

爱被打了一巴掌 2022-03-18 15:59 326阅读 0赞

###### 先[启动nacos服务][nacos] ######

###### 案例如下： ######

*  结合springboot，application.properties配置：

nacos.config.server-addr=127.0.0.1:8848
    
     endpoint http://localhost:8080/actuator/nacos-config
     health http://localhost:8080/actuator/health
    management.endpoints.web.exposure.include=*
    management.endpoint.health.show-details=always

*  pom配置：

<properties>
            <spring-boot.version>2.0.3.RELEASE</spring-boot.version>
            <nacos-config-spring-boot.version>0.2.1</nacos-config-spring-boot.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
                <version>${spring-boot.version}</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
                <version>${spring-boot.version}</version>
            </dependency>
    
            <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>
           
        </dependencies>

*  启动主类：NacosConfigApplication.java

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

*  测试demo：ConfigController.java

import com.alibaba.nacos.api.annotation.NacosInjected;
    import com.alibaba.nacos.api.config.ConfigService;
    import com.alibaba.nacos.api.config.annotation.NacosValue;
    import com.alibaba.nacos.api.exception.NacosException;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import static org.springframework.web.bind.annotation.RequestMethod.GET;
    
    @Controller
    @RequestMapping("config")
    public class ConfigController {
    
        private static final Logger log = LoggerFactory.getLogger(ConfigController.class);
    
        @NacosInjected
        ConfigService configService;
    
        @NacosValue(value = "${useLocalCache:xxx}", autoRefreshed = true)
        private String useLocalCache;
    
        @RequestMapping(value = "/get", method = GET)
        @ResponseBody
        public String get() {
        // http://localhost:8080/config/get
            return useLocalCache;
        }
    
        @RequestMapping(value = "/publish", method = GET)
        @ResponseBody
        public String doPublish() {
        // http://localhost:8080/config/publish
            try {
                log.info("原始值{}", configService.getConfig("example", "DEFAULT_GROUP", 20000));
                configService.publishConfig("example", "DEFAULT_GROUP", "useLocalCache=api更改");
                log.info("更改后的值{}", configService.getConfig("example", "DEFAULT_GROUP", 20000));
    
                return "SUCESS";
            } catch (NacosException e) {
                e.printStackTrace();
                return "FALSE";
            }
        }

*  此时我们访问http://localhost:8080/config/get，得到的值是默认值：xxx
 *  自定义配置，登陆nacos控制台:[http://127.0.0.1:8848/nacos/][http_127.0.0.1_8848_nacos]  
    在配置列表中，打开dateId为example的配置，编辑。如果没有这个dateId，就点击“+”，自行添加  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E3MTg1MTUwMjg_size_16_color_FFFFFF_t_70]  
    添加配置：  
    useLocalCache=ssss  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E3MTg1MTUwMjg_size_16_color_FFFFFF_t_70 1]  
    再次访问http://localhost:8080/config/get，得到结果：ssss，配置实时生效。

###### 使用ConfigService，改变控制台的值 ######

代码如上，思路就是使用NacosInjected注解，获取ConfigService，然后利用api更改nacos配置  
访问http://localhost:8080/config/publish，刷新控制台，可以看到控制台的值已经变成如下，已经实时更改  
![在这里插入图片描述][20190221144935632.png]

[nacos]: https://blog.csdn.net/a718515028/article/details/87857087
[http_127.0.0.1_8848_nacos]: http://127.0.0.1:8848/nacos/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E3MTg1MTUwMjg_size_16_color_FFFFFF_t_70]: /images/20220318/e80cdea58c0c464ca81cc2d4313f7f60.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E3MTg1MTUwMjg_size_16_color_FFFFFF_t_70 1]: /images/20220318/acf87afd808b4b25861bf48a2e6fb599.png
[20190221144935632.png]: /images/20220318/5b0b34397f1b4ddf93b6211cb017085b.png