本章介绍SpringBoot与与Dubbo。
Apache Dubbo 是一个基于Java的高性能，轻量级的RPC框架。Dubbo提供了三个关键功能，包括基于接口的远程呼叫，容错和负载平衡以及自动服务注册和发现。
Dubbo服务提供商
1、新建一个项目SpringBoot Web项目，引入Dubbo依赖
1 <!-- Dubbo Spring Boot Starter --> 2 <dependency> 3 <groupId>org.apache.dubbo</groupId> 4 <artifactId>dubbo-spring-boot-starter</artifactId> 5 <version>2.7.5</version> 6 </dependency>
完整pom文件如下：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 5 <modelVersion>4.0.0</modelVersion> 6 7 <groupId>com.test</groupId> 8 <artifactId>test-springboot-dubbo-provider</artifactId> 9 <version>1.0-SNAPSHOT</version> 10 11 <parent> 12 <groupId>org.springframework.boot</groupId> 13 <artifactId>spring-boot-starter-parent</artifactId> 14 <version>2.1.8.RELEASE</version> 15 </parent> 16 17 <properties> 18 <dubbo.version>2.7.5</dubbo.version> 19 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 20 <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 21 <java.version>1.8</java.version> 22 </properties> 23 24 <dependencies> 25 26 <dependency> 27 <groupId>org.springframework.boot</groupId> 28 <artifactId>spring-boot-starter-web</artifactId> 29 </dependency> 30 31 <!-- Dubbo Spring Boot Starter --> 32 <dependency> 33 <groupId>org.apache.dubbo</groupId> 34 <artifactId>dubbo-spring-boot-starter</artifactId> 35 <version>${dubbo.version}</version> 36 </dependency> 37 38 <dependency> 39 <groupId>org.springframework.boot</groupId> 40 <artifactId>spring-boot-starter-test</artifactId> 41 <scope>test</scope> 42 </dependency> 43 44 </dependencies> 45 46 47 <!-- SpringBoot打包插件，可以将代码打包成一个可执行的jar包 --> 48 <build> 49 <plugins> 50 <plugin> 51 <groupId>org.springframework.boot</groupId> 52 <artifactId>spring-boot-maven-plugin</artifactId> 53 </plugin> 54 </plugins> 55 </build> 56 57 </project>
目录如下：
2、编写配置文件application.properties
1 # spring应用名 2 # Spring boot application 3 spring.application.name=dubbo-auto-configuration-provider-demo 4 # Base packages to scan Dubbo Component: @org.apache.dubbo.config.annotation.Service 5 dubbo.scan.base-packages=com.test.springboot.dubbo.provider.service 6 7 # Dubbo应用：dubbo应用吗默认值是spring应用名 8 # Dubbo Application 9 ## The default value of dubbo.application.name is ${spring.application.name} 10 ## dubbo.application.name=${spring.application.name} 11 12 # Dubbo协议 13 # Dubbo Protocol 14 dubbo.protocol.name=dubbo 15 dubbo.protocol.port=12345 16 17 # 不在zookeeper上注册服务 18 ## Dubbo Registry 19 dubbo.registry.address=N/A
其中采用了dubbo协议，在12345端口通信，不再zookeeper上注册服务
3、编写DemoService接口
1 package com.test.springboot.dubbo.provider.service; 2 3 public interface DemoService { 4 5 String sayHello(String name); 6 7 }
4、编写实现接口DefaultDemoService，它实现了接口DemoService
1 package com.test.springboot.dubbo.provider.service; 2 3 import org.apache.dubbo.config.annotation.Service; 4 import org.springframework.beans.factory.annotation.Value; 5 6 // 被扫描为dubbo服务 7 @Service(version = "1.0.0") 8 public class DefaultDemoService implements DemoService { 9 10 /** 11 * The default value of ${dubbo.application.name} is ${spring.application.name} 12 */ 13 @Value("${dubbo.application.name}") 14 private String serviceName; 15 16 public String sayHello(String name) { 17 return String.format("[%s] : Hello, %s", serviceName, name); 18 } 19 20 }
5、启动项目，将服务部署起来
Dubbo服务使用者
1、新建一个新项目SpringBoot Web项目，引入Dubbo依赖
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 5 <modelVersion>4.0.0</modelVersion> 6 7 <groupId>com.test</groupId> 8 <artifactId>test-springboot-dubbo-consumer</artifactId> 9 <version>1.0-SNAPSHOT</version> 10 11 12 <parent> 13 <groupId>org.springframework.boot</groupId> 14 <artifactId>spring-boot-starter-parent</artifactId> 15 <version>2.1.8.RELEASE</version> 16 </parent> 17 18 <properties> 19 <dubbo.version>2.7.5</dubbo.version> 20 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 21 <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 22 <java.version>1.8</java.version> 23 </properties> 24 25 <dependencies> 26 27 <dependency> 28 <groupId>org.springframework.boot</groupId> 29 <artifactId>spring-boot-starter-web</artifactId> 30 </dependency> 31 32 <!-- Dubbo Spring Boot Starter --> 33 <dependency> 34 <groupId>org.apache.dubbo</groupId> 35 <artifactId>dubbo-spring-boot-starter</artifactId> 36 <version>${dubbo.version}</version> 37 </dependency> 38 39 <dependency> 40 <groupId>org.springframework.boot</groupId> 41 <artifactId>spring-boot-starter-test</artifactId> 42 <scope>test</scope> 43 </dependency> 44 45 </dependencies> 46 47 48 <!-- SpringBoot打包插件，可以将代码打包成一个可执行的jar包 --> 49 <build> 50 <plugins> 51 <plugin> 52 <groupId>org.springframework.boot</groupId> 53 <artifactId>spring-boot-maven-plugin</artifactId> 54 </plugin> 55 </plugins> 56 </build> 57 </project>
目录结构如下：
2、编写配置文件application.properties
1 spring.application.name: dubbo-auto-configure-consumer-sample
3、拷贝服务提供者的DemoService接口，接口的类路径不变
1 // 类路径不变 2 package com.test.springboot.dubbo.provider.service; 3 4 public interface DemoService { 5 6 String sayHello(String name); 7 8 }
4、编写实测试类
1 @RunWith(SpringRunner.class) 2 @SpringBootTest 3 public class TestApplication { 4 5 @Reference(version = "1.0.0", url = "dubbo://127.0.0.1:12345") 6 private DemoService demoService; 7 8 @Test 9 public void sayHello(){ 10 System.out.println(demoService.sayHello("XX")); 11 } 12 13 }
5、运行测试类sayHello方法()，效果如下：
