Spring Cloud使用Nacos作为服务中心编写服务提供者

香草物语博客 2021-07-30

369

在Nacos集群配置^[1]中，我们介绍了Nacos的安装以及集群配置，本文我们介绍一下在Spring Cloud中如何使用Nacos作为服务注册中心。

编写父工程

父工程只提供基本的依赖关系，一定要注意版本，否则会出现很多乱七八糟的错误。父工程依赖如下

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>


    <groupId>net.xiangcaowuyu</groupId>
    <artifactId>Cloud2020</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>


    <modules>
        <module>cloud-provider-payment8001</module>
        <module>cloud-consumer-order80</module>
        <module>cloud-api-common</module>
        <module>cloud-provider-payment8004</module>
        <module>cloud-consumerzk-order80</module>
        <module>cloud-consumer-feign-order80</module>
        <module>cloud-provider-hystrix-payment8001</module>
        <module>cloud-consumer-feign-hystrix-order80</module>
        <module>cloud-consumer-hystrix-dashboard9001</module>
        <module>cloud-gateway-gateway9527</module>
        <module>cloud-config-center-3344</module>
        <module>cloud-config-client-3355</module>
        <module>cloud-config-client-3366</module>
        <module>cloud-stream-rabbitmq-provider8801</module>
        <module>cloud-stream-rabbitmq-consumer8802</module>
        <module>cloud-stream-rabbitmq-consumer8803</module>
        <module>cloud-stream-rabbitmq-consumer8802</module>
        <module>cloud-stream-rabbitmq-consumer8803</module>
        <module>cloud-stream-rabbitmq-consumer8803</module>
        <module>cloudalibaba-provider-payment9001</module>
        <module>cloudalibaba-provider-payment9002</module>
        <module>cloudalibaba-consumer-order8888</module>
        <module>cloudalibaba-config-nacos-client3377</module>
        <module>cloudalibaba-sentinel-service8401</module>
        <module>seata-order-service2001</module>
        <module>seata-storage-service2002</module>
        <module>seata-account-service2003</module>
    </modules>


    <!--    统一管理jar包版本-->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <junit.version>4.12</junit.version>
        <log4j.version>1.2.17</log4j.version>
        <lombok.version>1.16.18</lombok.version>
        <mysql.version>5.1.47</mysql.version>
        <druid.version>1.1.16</druid.version>
        <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
    </properties>


    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.3.12.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR12</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
<!--                <version>2.1.0.RELEASE</version>-->
                <version>2.2.1.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${druid.version}</version>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.version}</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>${mybatis.spring.boot.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>


    <build>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-site-plugin</artifactId>
                    <version>3.7.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-project-info-reports-plugin</artifactId>
                    <version>3.0.0</version>
                </plugin>
            </plugins>
        </pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-site-plugin</artifactId>
                <configuration>
                    <locales>en,fr</locales>
                </configuration>
            </plugin>
        </plugins>
    </build>


    <reporting>
        <plugins>
            <plugin>
                <artifactId>maven-project-info-reports-plugin</artifactId>
            </plugin>
        </plugins>
    </reporting>
</project>

请忽略其他的项目模块。

编写服务提供者

编写一个简单的服务提供者，输出一个字符串。

添加依赖

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>Cloud2020</artifactId>
        <groupId>net.xiangcaowuyu</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>


    <artifactId>cloudalibaba-provider-payment9002</artifactId>


    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </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-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.7.5</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>


</project>

修改配置文件

server:
  port: 9001
spring:
  application:
    name: nacos-provider-payment
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.120.180:8848
management:
  endpoints:
    web:
      exposure:
        include: "*"

修改启动类

@SpringBootApplication
public class PaymentProviderMain9001 {


    public static void main(String[] args){
        SpringApplication.run(PaymentProviderMain9001.class,args);
    }


}

编写服务接口

@RestController
@Slf4j
public class NacosController {


    @Value("${server.port}")
    private String serverPort;


    @GetMapping(value = "/echo/{string}")
    public String echo(@PathVariable String string) {
        return "Hello Nacos Discovery " + string+"\t当前服务端口:"+serverPort;
    }


}

启动服务，我们可以查看以下Nacos是否有对应的服务。

集群

一般情况下，为了系统的健壮性，我们都会进行集群。我这里为了方便调试，复制了一个cloudalibaba-provider-payment9001
工程，只是将端口号改成9002
,然后，我们启动9002
端口项目，再次查看Nacos

12573-tgkun9542vq.png

可以看到当前有两个实例了。集群的关键时服务名称需要一致，也就是我们配置文件中的spring.application.name
必须保持一致。

References

[1]
Nacos集群配置: https://www.xiangcaowuyu.net/devtools/nacos-cluster-configuration.html

数据库

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