springboot集成Nacos的配置中心，注册中心

女爷i 2023-06-30 01:39 12阅读 0赞

新建springboot 项目boot-user-service，boot-order-service服务

首先[Nacos官网][Nacos]下载nacos到本地，解压后进入/bin目录，点击windows启动即可启动

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启动后浏览器输入[http://localhost:8848/nacos][http_localhost_8848_nacos] 如果能够访问到就说明成功，Nacos默认账户和密码都是nacos

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3p4bDY0NjgwMTkyNA_size_16_color_FFFFFF_t_70 1][]

### 增加pom依赖： ###

*注意：版本 0.2.x.RELEASE 对应的是 Spring Boot 2.x 版本，版本 0.1.x.RELEASE 对应的是 Spring Boot 1.x 版本。*

<dependency>
    	<groupId>com.alibaba.boot</groupId>
    	<artifactId>nacos-config-spring-boot-starter</artifactId>
    	<version>0.2.3</version>
    </dependency>
    
    
    <dependency>
    	<groupId>com.alibaba.boot</groupId>
    	<artifactId>nacos-discovery-spring-boot-starter</artifactId>
    	<version>0.2.3</version>
    </dependency>

### 增加配置文件： ###

boot-user-service配置文件application.properties配置内容

spring.application.name=boot-user-service
    server.port=8801
    
    # nacos配置地址
    nacos.config.server-addr=127.0.0.1:8848
    # nacos注册地址
    nacos.discovery.server-addr=127.0.0.1:8848
    
    spring.jackson.date-format=yyyy-MM-dd HH:mm:ss
    spring.jackson.time-zone=GMT+8

boot-order-service配置内容：

spring.application.name=boot-order-service
    server.port=8802
    
    # nacos配置地址
    nacos.config.server-addr=127.0.0.1:8848
    # nacos注册地址
    nacos.discovery.server-addr=127.0.0.1:8848
    
    spring.jackson.date-format=yyyy-MM-dd HH:mm:ss
    spring.jackson.time-zone=GMT+8

项目启动文件使用 @NacosPropertySource 加载 dataId 为 example 的配置源，并开启自动更新

boot-user-service启动类

@SpringBootApplication
    @NacosPropertySource(dataId = "boot-user-service", autoRefreshed = true)
    public class BootUserServiceApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(BootUserServiceApplication.class, args);
        }
    
        @PostConstruct
        void setDefaultTimeZone() {
            TimeZone.setDefault(TimeZone.getTimeZone("Asia/Shanghai"));
        }
    
    }

boot-order-service启动类

@SpringBootApplication
    @NacosPropertySource(dataId = "boot-order-service", autoRefreshed = true)
    public class BootOrderServiceApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(BootOrderServiceApplication.class, args);
        }
    
        @PostConstruct
        void setDefaultTimeZone() {
            TimeZone.setDefault(TimeZone.getTimeZone("Asia/Shanghai"));
        }
    
    }

OK，springboot服务集成Nacos配置就已经完成了，启动项目即可

## 配置中心： ##

进入nacos管理页面 - 配置管理 - 配置列表，分别增加boot-user-service和boot-order-service的配置参数

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3p4bDY0NjgwMTkyNA_size_16_color_FFFFFF_t_70 2][]

boot-order-service配置

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3p4bDY0NjgwMTkyNA_size_16_color_FFFFFF_t_70 3][]

配置好了后分别新建BootUserController和BootOrderController调用获取配置内容

BootUserController内容：

通过 Nacos 的 @NacosValue 注解设置属性值，示例中会加载配置中的值，如果没有则取到的值为123，启动自动刷新。

@Slf4j
    @RestController
    @RequestMapping("/bootUser")
    public class BootUserController extends BaseController {
    
        @NacosValue(value = "${nacos.test:123}", autoRefreshed = true)
        String properties;
    
        @RequestMapping("/getProperties")
        public Results getProperties() {
            return succeed(properties);
        }
    
    }

BaseController为自定义类方便为了返回json格式的数据，浏览器访问 [http://localhost:8801/bootUser/getProperties][http_localhost_8801_bootUser_getProperties]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3p4bDY0NjgwMTkyNA_size_16_color_FFFFFF_t_70 4][]

同理BootOrderController内容：

@Slf4j
    @RestController
    @RequestMapping("/bootOrder")
    public class BootOrderController extends BaseController {
    
        @NacosValue(value = "${nacos.test:123}", autoRefreshed = true)
        String properties;
    
        @RequestMapping("/getProperties")
        public Results getProperties() {
            return succeed(properties);
        }
    
    }

浏览器访问 [http://localhost:8802/bootOrder/getProperties][http_localhost_8802_bootOrder_getProperties]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3p4bDY0NjgwMTkyNA_size_16_color_FFFFFF_t_70 5][]

## 注册中心 ##

启动user和order项目后naocs控制台上服务列表并没有我们的服务

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3p4bDY0NjgwMTkyNA_size_16_color_FFFFFF_t_70 6][]

增加配置让项目启动的时候自动注册到nacos注册中心

/**
     * @Description: Nacos服务启动自动注册配置
     */
    @Configuration
    public class NacosRegisterConfig {
        @Value("${server.port}")
        private int serverPort;
    
        @Value("${spring.application.name}")
        private String applicationName;
    
        @NacosInjected
        private NamingService namingService;
    
        @PostConstruct
        public void registerInstance() throws NacosException {
            namingService.registerInstance(applicationName, "127.0.0.1",serverPort,"DEFAULT");
        }
    }

配置好了再次启动项目就可以看到2个服务注册到了服务列表

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3p4bDY0NjgwMTkyNA_size_16_color_FFFFFF_t_70 7][]

## 服务发现/调用 ##

服务注册到了nacos后我们就可以相互调用，采用项目名称调用，order项目调用user项目的接口获取用户名

使用 @NacosInjected 注入 Nacos 的 NamingService 实例，并使用namingService获取提供boot-user-service服务的实例，通过restTemplate调用其getUser接口

boot-order-service 新建一个接口通过rest方式调用user服务

@Slf4j
    @Service
    public class UserServiceClient {
        @NacosInjected
        NamingService namingService;
    
        private RestTemplate restTemplate = new RestTemplate();
    
        private static final String USER_SERVICE = "boot-user-service";
        private static final String GET_USER_NAME = "/bootUser/getUserName";
    
        /**
         * 获取用户名
         * @return
         */
        public String getUserName() {
            try {
                if (namingService != null) {
                    // 选择 bootuser-service 服务的一个健康实例
                    Instance instance = namingService.selectOneHealthyInstance(USER_SERVICE);
                    // 拼接请求url
                    String url = "http://" + instance.getIp() + ":" + instance.getPort() + GET_USER_NAME;
                    // 采用rest方式调用user-service服务获取用户名
                    ResponseEntity<String> entity = restTemplate.getForEntity(url, String.class);
                    return entity.getBody();
                }
            } catch (Exception e) {
                log.error("query bootuser error", e);
            }
            return null;
        }
    }

order服务开启一个获取订单的接口

@Slf4j
    @RestController
    @RequestMapping("/bootOrder")
    public class BootOrderController extends BaseController {
    
        @Autowired
        UserServiceClient userServiceClient;
    
        @NacosValue(value = "${nacos.test:123}", autoRefreshed = true)
        String properties;
    
        @RequestMapping("/getProperties")
        public Results getProperties() {
            return succeed(properties);
        }
    
    
        /**
         * 获取订单
         * @return
         */
        @GetMapping("/getOrder")
        public Results getOrder() {
            String userName = userServiceClient.getUserName();
    
            Order order = new Order();
            order.setId(1);
            order.setUserName(userName);
            order.setCreateTime(new Date());
    
            return succeed(order);
        }
    }

首先浏览器直接调用user服务获取用户名

![20200113172408714.png][]

访问order服务接口，里面调用user服务获取用户名

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3p4bDY0NjgwMTkyNA_size_16_color_FFFFFF_t_70 8][]

[Nacos]: https://nacos.io/zh-cn/
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[http_localhost_8848_nacos]: http://localhost:8848/nacos
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[http_localhost_8801_bootUser_getProperties]: http://localhost:8801/bootUser/getProperties
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[http_localhost_8802_bootOrder_getProperties]: http://localhost:8802/bootOrder/getProperties
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[20200113172408714.png]: https://img-blog.csdnimg.cn/20200113172408714.png
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