Spring boot 2.1.9 + Dubbo 2.7.3 + Nacos 1.1.4 构建微服务系统
Spring boot 2.1.9 + Dubbo 2.7.3 + Nacos 1.1.4 构建微服务系统
-
Spring boot 2.1.9 + Dubbo 2.7.3 + Nacos 1.1.4 构建微服务系统 , mydemo
-
下载最新版本的 Nacos Server , 具体参见下面 注册中心部分
#启动 Nacos 服务 sh startup.sh -m standalone -
parent pom
<modelVersion>4.0.0modelVersion> <packaging>pompackaging> <modules> <module>dubbo-apimodule> <module>dubbo-providermodule> <module>dubbo-consumermodule> modules> <groupId>com.examplegroupId> <artifactId>dubbo-demoartifactId> <version>1.0-SNAPSHOTversion> <properties> <spring-boot.version>2.1.9.RELEASEspring-boot.version> <dubbo.version>2.7.3dubbo.version> <nacos-config-spring-boot.version>0.2.1nacos-config-spring-boot.version> <java.version>1.8java.version> <maven.compiler.source>1.8maven.compiler.source> <maven.compiler.target>1.8maven.compiler.target> properties> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-dependenciesartifactId> <version>${spring-boot.version}version> <type>pomtype> <scope>importscope> dependency> <dependency> <groupId>org.apache.dubbogroupId> <artifactId>dubbo-dependencies-bomartifactId> <version>${dubbo.version}version> <type>pomtype> <scope>importscope> dependency> <dependency> <groupId>org.apache.dubbogroupId> <artifactId>dubbo-spring-boot-starterartifactId> <version>${dubbo.version}version> dependency> <dependency> <groupId>org.apache.dubbogroupId> <artifactId>dubboartifactId> <version>${dubbo.version}version> dependency> <dependency> <groupId>org.apache.dubbogroupId> <artifactId>dubbo-registry-nacosartifactId> <version>${dubbo.version}version> dependency> <dependency> <groupId>com.alibaba.bootgroupId> <artifactId>nacos-config-spring-boot-starterartifactId> <version>${nacos-config-spring-boot.version}version> dependency> <dependency> <groupId>com.alibaba.nacosgroupId> <artifactId>nacos-clientartifactId> <version>1.1.4version> dependency> <dependency> <groupId>com.examplegroupId> <artifactId>dubbo-apiartifactId> <version>1.0-SNAPSHOTversion> dependency> dependencies> dependencyManagement> <build> <pluginManagement> <plugins> <plugin> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-maven-pluginartifactId> <version>${spring-boot.version}version> <executions> <execution> <goals> <goal>repackagegoal> goals> execution> executions> plugin> plugins> pluginManagement> <plugins> <plugin> <groupId>org.apache.maven.pluginsgroupId> <artifactId>maven-compiler-pluginartifactId> <version>3.8.0version> <configuration> <source>${maven.compiler.source}source> <target>${maven.compiler.target}target> configuration> plugin> plugins> build> -
扩展：在 parent pom 文件中为什么需要定义
-
原因是：parent pom 文件中没有继承 spring-boot-starter-parent pom 文件，即没有下面的配置
<parent> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-parentartifactId> <version>2.1.9.RELEASEversion> parent> -
如果没有自定义上面的
-
为什么不能继承 spring-boot-starter-parent pom 文件呢？ 原因是：interface / util 项目不需要继承，只有真正需要运行的程序（无论是web 还是 console 程序，即有main函数的项目），才需要继承 spring-boot-starter-parent pom 文件
-
-
dubbo common , provider 和 consumer 共享模块
<parent> <artifactId>dubbo-demoartifactId> <groupId>com.examplegroupId> <version>1.0-SNAPSHOTversion> parent> <modelVersion>4.0.0modelVersion> <groupId>com.jianzh5groupId> <artifactId>dubbo-commonartifactId> <packaging>jarpackaging>// 定义接口 public interface HelloService { String sayHello(); } -
dubbo provider : 注意，不需要 spring-boot-starter-web 依赖，它不是 web api项目，不对外提供服务
<parent> <artifactId>dubbo-demoartifactId> <groupId>com.examplegroupId> <version>1.0-SNAPSHOTversion> parent> <modelVersion>4.0.0modelVersion> <groupId>com.examplegroupId> <artifactId>dubbo-providerartifactId> <dependencies> <dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starterartifactId> dependency> <dependency> <groupId>org.apache.dubbogroupId> <artifactId>dubbo-spring-boot-starterartifactId> dependency> <dependency> <groupId>org.apache.dubbogroupId> <artifactId>dubboartifactId> dependency> <dependency> <groupId>org.apache.dubbogroupId> <artifactId>dubbo-registry-nacosartifactId> dependency> <dependency> <groupId>com.alibaba.nacosgroupId> <artifactId>nacos-clientartifactId> dependency> <dependency> <groupId>com.examplegroupId> <artifactId>dubbo-apiartifactId> dependency> dependencies> <build> <plugins> <plugin> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-maven-pluginartifactId> plugin> plugins> build>#配置文件 dubbo.scan.base-packages=com.example.demo.user.service dubbo.application.name = dubbo-provider dubbo.registry.address = nacos://192.168.136.129:8848 dubbo.protocol.port=20881 dubbo.protocol.name=dubbo// 接口实现 @Service public class HelloServiceImpl implements HelloService { public String sayHello() { Return "welcome to WeChat public address: JAVA RI Zhi Lu". } } -
@EnableDubbo 注解的作用 ：通过
@EnableDubbo可以在指定的包名下（通过scanBasePackages），或者指定的类中（通过scanBasePackageClasses）扫描 Dubbo 的服务提供者（以@Service标注）以及 Dubbo 的服务消费者（以Reference标注），它是@EnableDubboConfig和@DubboComponentScan两者组合的便捷表达方式。@SpringBootApplication @EnableDubbo public class PrivoderApplication { public static void main(String[] args) { SpringApplication.run(PrivoderBootstrap.class, args); } } -
dubbo consumer : 注意，需要 spring-boot-starter-web 依赖，因为它是web api 项目，让外部访问
<parent> <artifactId>dubbo-demoartifactId> <groupId>com.examplegroupId> <version>1.0-SNAPSHOTversion> parent> <modelVersion>4.0.0modelVersion> <groupId>com.examplegroupId> <artifactId>dubbo-consumerartifactId> <dependencies> <dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starterartifactId> dependency> <dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-webartifactId> dependency> <dependency> <groupId>org.apache.dubbogroupId> <artifactId>dubbo-spring-boot-starterartifactId> dependency> <dependency> <groupId>org.apache.dubbogroupId> <artifactId>dubboartifactId> dependency> <dependency> <groupId>org.apache.dubbogroupId> <artifactId>dubbo-registry-nacosartifactId> dependency> <dependency> <groupId>com.alibaba.nacosgroupId> <artifactId>nacos-clientartifactId> dependency> <dependency> <groupId>com.examplegroupId> <artifactId>dubbo-apiartifactId> dependency> dependencies> <build> <plugins> <plugin> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-maven-pluginartifactId> plugin> plugins> build>#配置文件 dubbo.scan.base-packages=com.example.demo.consumer spring.application.name=dubbo-consumer dubbo.registry.address = nacos://192.168.136.129:8848 server.port=9090@RestController public class HelloController { @Reference private HelloService helloService; @GetMapping("/sayHello") public String sayHello(){ return helloService.sayHello(); } }// 测试结果：如果没有 @EnableDubbo 注解，也是可以 run 的，但是如果provider没有此注解，就无法run，不知道为什么？ // 为了和官方文档一致，还是加上吧 @EnableDubbo @SpringBootApplication public class ConsumerApplication { public static void main(String[] args) { SpringApplication.run(ConsumerBootstrap.class, args); } }
-