SpringCloudAlibaba 企业级应用实战:基于Nacos 实现服务发现

悠悠 2023-06-25 10:19 168阅读 0赞

### 文章目录 ###

*  基于Nacos实现服务发现
 *   *  案例说明
     *  服务提供者实现步骤
     *   *  依赖管理
         *  服务配置文件
         *  创建服务提供者启动类
         *  创建服务端控制器
     *  服务消费者实现步骤
     *   *  依赖管理
         *  服务配置文件
         *  创建服务消费者启动类
         *  创建服务端控制器
     *  测试步骤
     *  引用

# 基于Nacos实现服务发现 #

## 案例说明 ##

本文通过一个简单的示例来演示如何在`SpringCloud`生态体系中使用`Nacos`来实现服务发现功能。业务流程如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215TmFtZUlzc2xz_size_16_color_FFFFFF_t_70]

## 服务提供者实现步骤 ##

### 依赖管理 ###

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>

### 服务配置文件 ###

server.port=7000
    spring.application.name=sca-account-service
    spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
    management.endpoints.web.exposure.include=*

### 创建服务提供者启动类 ###

import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.boot.CommandLineRunner;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    @SpringBootApplication
    @EnableDiscoveryClient
    public class ScaAccountServiceApplication implements CommandLineRunner {
    
        Logger logger = LoggerFactory.getLogger(this.getClass());
    
        public static void main(String[] args) {
            SpringApplication.run(ScaAccountServiceApplication.class, args);
        }
    
        public void run(String... args) throws Exception {
            logger.info("-------------- 账户应用服务提供者-启动成功 --------------");
        }

### 创建服务端控制器 ###

import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class AccountController {
    
    
        @GetMapping(value = "/echo/{string}")
        public String echo(@PathVariable String string) {
            return "您好：" + string;
        }
    
    }

以上是服务提供者的主要代码

## 服务消费者实现步骤 ##

### 依赖管理 ###

### 服务配置文件 ###

server.port=7001
    spring.application.name=sca-account-service
    spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
    management.endpoints.web.exposure.include=*

### 创建服务消费者启动类 ###

import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    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.cloud.client.loadbalancer.LoadBalanced;
    import org.springframework.context.annotation.Bean;
    import org.springframework.web.client.RestTemplate;
    
    @SpringBootApplication
    @EnableDiscoveryClient
    public class AccountConsumerApplication implements CommandLineRunner {
    
        Logger logger = LoggerFactory.getLogger(this.getClass());
    
        public static void main(String[] args) {
            SpringApplication.run(AccountConsumerApplication.class, args);
        }
    
        public void run(String... args) throws Exception {
            logger.info("-------------- 账户应用服务消费者-启动成功 --------------");
        }
    
        @LoadBalanced
        @Bean
        public RestTemplate restTemplate() {
            return new RestTemplate();
        }
    }

### 创建服务端控制器 ###

import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.client.RestTemplate;
    
    @RestController
    public class AccountConsumerController {
    
    
        @Autowired private RestTemplate restTemplate;
    
        @RequestMapping(value = "/echo/{str}", method = RequestMethod.GET)
        public String echo(@PathVariable String str) {
            return restTemplate.getForObject("http://sca-account-service/echo/" + str, String.class);
        }
    
    }

以上是服务消费者的主要代码

## 测试步骤 ##

分别启动服务提供者和服务消费者，可以在`Nacos`控制台看看服务列表，如下图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215TmFtZUlzc2xz_size_16_color_FFFFFF_t_70 1]  
浏览器里分别输入以下请求地址并观察页面输出：  
服务提供者请求：`http://localhost:7000/echo/我是服务提供者`。结果如下图：  
![在这里插入图片描述][20191228115729413.png]  
服务消费者请求：`http://localhost:7001/echo/我是服务消费者`。结果如下图：  
![在这里插入图片描述][20191228115920538.png]

## 引用 ##

*  参考链接：[https://nacos.io/zh-cn/docs/quick-start-spring-cloud.html][https_nacos.io_zh-cn_docs_quick-start-spring-cloud.html]
 *  源代码链接：[https://github.com/myNameIssls/spring-cloud-alibaba-study/tree/master/sca-dependences/sca-account][https_github.com_myNameIssls_spring-cloud-alibaba-study_tree_master_sca-dependences_sca-account]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215TmFtZUlzc2xz_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191228112416488.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215TmFtZUlzc2xz,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215TmFtZUlzc2xz_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191228114733271.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L215TmFtZUlzc2xz,size_16,color_FFFFFF,t_70
[20191228115729413.png]: https://img-blog.csdnimg.cn/20191228115729413.png
[20191228115920538.png]: https://img-blog.csdnimg.cn/20191228115920538.png
[https_nacos.io_zh-cn_docs_quick-start-spring-cloud.html]: https://nacos.io/zh-cn/docs/quick-start-spring-cloud.html
[https_github.com_myNameIssls_spring-cloud-alibaba-study_tree_master_sca-dependences_sca-account]: https://github.com/myNameIssls/spring-cloud-alibaba-study/tree/master/sca-dependences/sca-account