Nacos教程_3 整合SpringCloud(配置中心+服务发现)

小灰灰 2023-01-06 11:45 93阅读 0赞

> 教程原稿 https://gitee.com/fakerlove/joker-nacos

### 文章目录 ###

*  3. 整合SpringCloud(配置中心+服务发现)
 *   *  3.1 写配置
     *  3.2 创建父工程demo
     *  3.3 创建nacos-provider 子工程
     *   *  pom 文件
         *  创建bootstrap.yml
         *  创建主程序
         *  创建controller
     *  3.4 创建nacos-consumer 子工程
     *   *  pom 文件
         *  创建bootstrap.yml
         *  创建主程序
         *  创建controller
     *  3.5 测试

# 3. 整合SpringCloud(配置中心+服务发现) #

## 3.1 写配置 ##

![image-20210113104707209][]

![image-20210113134337305][]

## 3.2 创建父工程demo ##

> 记住springboot 版本需要在2.0到2.3 之间，以上的话。nacos 是不支持的
> 
> 2.2.12 版本是nacos 所支持的最高版本

**pom文件**

<?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>2.2.12.RELEASE</version>
            <relativePath/> 
        </parent>
    
        <groupId>com.example</groupId>
        <artifactId>demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>demo</name>
        <description>Demo project for Spring Boot</description>
        <modules>
            <module>nacos-provider</module>
            <module>nacos-consumer</module>
        </modules>
        <properties>
            <java.version>11</java.version>
            <nacos-config>2.2.3.RELEASE</nacos-config>
            <nacos-discovery>2.2.3.RELEASE</nacos-discovery>
    
        </properties>
    
        <dependencyManagement>
            <dependencies>
                
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Hoxton.SR9</version>
                    <type>pom</type>
                    <scope>runtime</scope>
                </dependency>
                
                <dependency>
                    <groupId>com.alibaba.cloud</groupId>
                    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
                    <version>${nacos-discovery}</version>
                </dependency>
    
                
                <dependency>
                    <groupId>com.alibaba.cloud</groupId>
                    <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
                    <version>${nacos-config}</version>
                </dependency>
            </dependencies>
        </dependencyManagement>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

## 3.3 创建nacos-provider 子工程 ##

### pom 文件 ###

<?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>
           <artifactId>demo</artifactId>
            <groupId>com.example</groupId>
            <version>0.0.1-SNAPSHOT</version>
        </parent>
    
        <groupId>com.example</groupId>
        <artifactId>nacos-provider</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>nacos-provider</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <java.version>11</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

### 创建bootstrap.yml ###

> bootstrap.yml 优先级是高于application.yml，效果是一样的
> 
> 如果你的 nacos 在本地的话，application.yml 是没有问题的
> 
> 如果是在网上的话，需要使用bootstrap.yml ,
> 
> 不然其中的server-addr 是没有效果的

server:
      port: 8070
    spring:
      application:
        name: nacos-provider
      cloud:
        # nacos服务地址
        nacos:
          config:
            server-addr: 47.100.104.187:8848
            namespace: cf6270d3-a5d2-46ac-a36a-051ef8fd0151
            group: DEFAULT_GROUP
            file-extension: yaml
            prefix: nacos-provider
          discovery:
            server-addr: 47.100.104.187:8848
            namespace: cf6270d3-a5d2-46ac-a36a-051ef8fd0151

### 创建主程序 ###

> @EnableDiscoveryClient开启服务发现

package com.example.nacosprovider;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    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;
    
    @SpringBootApplication
    @EnableDiscoveryClient
    public class NacosProviderApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(NacosProviderApplication.class, args);
        }
    
    }

### 创建controller ###

package com.example.nacosprovider.controller;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.cloud.context.config.annotation.RefreshScope;
    import org.springframework.web.bind.annotation.*;
    
    import java.time.LocalTime;
    
    @RefreshScope
    @RestController
    public class ProviderController { 
        @Value("${provider.name}")
        private String devConfig;
    
        /** * 这个是用来测试配置是否正确的方法 * @return */
        @GetMapping("invoke")
        public String invoke() { 
            return LocalTime.now() + " invoke,name:" + devConfig;
        }
    
        /** * 这个是用来服务发现的服务方法 * @param string * @return */
        @RequestMapping(value = "/echo/{string}", method = RequestMethod.GET)
        public String echo(@PathVariable String string) { 
            return "8070 端口--提供服务的方法 " + string;
        }
    }

## 3.4 创建nacos-consumer 子工程 ##

### pom 文件 ###

<?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>
            <artifactId>demo</artifactId>
            <groupId>com.example</groupId>
            <version>0.0.1-SNAPSHOT</version>
        </parent>
    
        <groupId>com.example</groupId>
        <artifactId>nacos-consumer</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>nacos-consumer</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <java.version>11</java.version>
        </properties>
    
        <dependencies>
    
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
                <version>2.2.6.RELEASE</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

### 创建bootstrap.yml ###

server:
      port: 8071
    spring:
      application:
        name: nacos-consumer
      cloud:
        # nacos服务地址
        nacos:
          server-addr: 47.100.104.187:8848
          config:
            namespace: cf6270d3-a5d2-46ac-a36a-051ef8fd0151
            group: DEFAULT_GROUP
            file-extension: yaml
            server-addr: 47.100.104.187:8848
          discovery:
            server-addr: 47.100.104.187:8848
            namespace: cf6270d3-a5d2-46ac-a36a-051ef8fd0151

### 创建主程序 ###

package com.example.nacosconsumer;
    
    import org.springframework.beans.factory.annotation.Autowired;
    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.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;
    
    @SpringBootApplication
    @EnableDiscoveryClient
    public class NacosConsumerApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(NacosConsumerApplication.class, args);
        }
    
        @LoadBalanced
        @Bean
        public RestTemplate restTemplate() { 
            return new RestTemplate();
    
        }
    
        /** * 这个是是用来测试 消费端能否连接服务端的 */
        @RestController
        public class TestController { 
            private final RestTemplate restTemplate;
    
            @Autowired
            public TestController(RestTemplate restTemplate) { this.restTemplate = restTemplate;}
            @RequestMapping(value = "/echo/{str}", method = RequestMethod.GET)
            public String echo(@PathVariable String str) { 
                return restTemplate.getForObject("http://nacos-provider/echo/" + str, String.class);
            }
        }
    }

### 创建controller ###

package com.example.nacosconsumer.controller;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.cloud.context.config.annotation.RefreshScope;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.time.LocalTime;
    
    @RefreshScope
    @RestController
    public class ConsumerController { 
        @Value("${consumer.name}")
        private String devConfig;
    
        /** * 这个是用来测试 消费端的接口是否正确 * @return */
        @GetMapping("invoke")
        public String invoke() { 
            return LocalTime.now() + " invoke,name:" + devConfig;
        }
    }

## 3.5 测试 ##

测试provider 配置信息是否成功

http://localhost:8070/invoke

![image-20210113135356397][]

测试consumer 配置信息是否成功

http://localhost:8071/invoke

![image-20210113135434343][]

查看consumer 能否调用 provider

http://localhost:8071/echo/22

![image-20210113135524712][]

查看是否注册成功

![image-20210113135606956][]

两个服务都成功

[image-20210113104707209]: /images/20221119/7b057ffd3e314b21a2846db87e3b8f81.png
[image-20210113134337305]: /images/20221119/c5a9845a17724617904df86f6c9cd58b.png
[image-20210113135356397]: https://img-blog.csdnimg.cn/img_convert/cfe74cf908793f399f08d3dcb25c698d.png
[image-20210113135434343]: https://img-blog.csdnimg.cn/img_convert/2bbcd820cb8b181e4e13477580710a74.png
[image-20210113135524712]: https://img-blog.csdnimg.cn/img_convert/b0f4e330e2e2de21cca619ea61290ba6.png
[image-20210113135606956]: https://img-blog.csdnimg.cn/img_convert/6930fbea026d17a2bb4091662364891a.png