一、说明：
本次学习Dubbo，分别针对三种情况组合写个三个Demo，每个Demo都提供了两个程序：Provider和consumer，provider就是服务的提供方，对外开放接口，consumer是服务的消费方，调用provider提供的服务（通过RPC的方式调用的）；
Provider和consumer程序都公用一个相同的接口（包名和类型必须完全相同，否则调用会报错的），这个接口可以放到一个公共的api包里面，然后provider和consumer都要依赖这个包；我在这里就偷了个懒，直接把接口定义到程序里面了；这三个Demo里面使用的公共接口定义如下：
1 public interface TestIntf { 2 String sayHello(); 3 }
此次将学习时搭建的三个Demo记录下来，方便以后查阅；
二、SpringMVC+Zookeeper+Dubbo的搭建：
1、先搭建一个SpringMVC工程；
2、POM依赖：
1 <properties> 2 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 3 <maven.compiler.source>1.7</maven.compiler.source> 4 <maven.compiler.target>1.7</maven.compiler.target> 5 <spring.version>4.2.6.RELEASE</spring.version> 6 </properties> 7 8 <dependencies> 9 10 <dependency> 11 <groupId>org.springframework</groupId> 12 <artifactId>spring-beans</artifactId> 13 <version>${spring.version}</version> 14 </dependency> 15 16 <!-- dubbo相关 --> 17 <dependency> 18 <groupId>com.alibaba</groupId> 19 <artifactId>dubbo</artifactId> 20 <version>2.5.6</version> 21 </dependency> 22 <dependency> 23 <groupId>org.apache.zookeeper</groupId> 24 <artifactId>zookeeper</artifactId> 25 <version>3.4.12</version> 26 </dependency> 27 28 <dependency> 29 <groupId>com.github.sgroschupf</groupId> 30 <artifactId>zkclient</artifactId> 31 <version>0.1</version> 32 </dependency> 33 34 <dependency> 35 <groupId>org.springframework</groupId> 36 <artifactId>spring-web</artifactId> 37 <version>${spring.version}</version> 38 </dependency> 39 <dependency> 40 <groupId>org.springframework</groupId> 41 <artifactId>spring-webmvc</artifactId> 42 <version>${spring.version}</version> 43 </dependency> 44 <dependency> 45 <groupId>org.springframework</groupId> 46 <artifactId>spring-context</artifactId> 47 <version>${spring.version}</version> 48 </dependency> 49 </dependencies>
3、applicationContext.xml配置文件的定义：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" 5 xmlns:context="http://www.springframework.org/schema/context" 6 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 7 http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> 8 9 <context:component-scan base-package="com.demo.dubbo.provider" /> 10 11 <dubbo:application name="dubbo-provider"/> 12 <dubbo:registry address="zookeeper://127.0.0.1:2181"/> 13 <dubbo:protocol name="dubbo" port="20880" /> 14 <dubbo:annotation package="com.demo.dubbo.provider.service.impl" /> 15 </beans>
4、服务实现类：
1 import com.alibaba.dubbo.config.annotation.Service; 2 3 @Service 4 public class TestIntfImpl implements TestIntf { 5 @Override 6 public String sayHello() { 7 return "hello, this is a dubbo demo project"; 8 } 9 }
注意：这里引用的@Service注解必须是dubbo包里面定义的，不能是Spring里面定义的那个，否则报错信息会莫名其妙；
5、同样可以在provider包里面实现Controller并调用刚才的服务接口：
1 @Controller 2 public class IndexController { 3 4 @Resource 5 private TestIntf testIntf; 6 7 @RequestMapping(value = "/home") 8 @ResponseBody 9 public String index() { 10 return testIntf.sayHello(); 11 } 12 }
6、建立一个SpringMVC工程consumer，POM.xml文件的定义和provider工程的一样；
7、Dubbo.xml文件定义：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" 5 xsi:schemaLocation="http://www.springframework.org/schema/beans 6 http://www.springframework.org/schema/beans/spring-beans.xsd 7 http://code.alibabatech.com/schema/dubbo 8 http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> 9 10 <!-- 消费方应用名，用于计算依赖关系，不是匹配条件，不要与提供方一样 --> 11 <dubbo:application name="dubbo-consumer" /> 12 13 <!--<!– 使用multicast广播注册中心暴露发现服务地址 –>--> 14 <dubbo:registry address="zookeeper://127.0.0.1:2181" /> 15 16 <!-- 生成远程服务代理，可以和本地bean一样使用demoService --> 17 <dubbo:reference id="testIntf" interface="com.demo.dubbo.TestIntf" /> 18 </beans>
8、dispatcher-servlet.xml文件引入dubbo.xml文件：
<import resource="dubbo.xml"/>
9、在Controller中调用RPC服务：
1 @Controller 2 public class IndexController { 3 @Resource 4 private TestIntf testIntf; 5 6 @RequestMapping("/home") 7 @ResponseBody 8 public String index() { 9 return testIntf.sayHello(); 10 } 11 }
三、SpringBoot+Zookeeper+Dubbo的搭建：
1、新建立两个SpringBoot工程provider和consumer；
2、POM.xml文件引入依赖（provider和consumer工程引入的依赖是一样的）：
1 <properties> 2 <java.version>1.8</java.version> 3 </properties> 4 5 <dependencies> 6 <dependency> 7 <groupId>org.springframework.boot</groupId> 8 <artifactId>spring-boot-starter-web</artifactId> 9 </dependency> 10 <dependency> 11 <groupId>com.alibaba.spring.boot</groupId> 12 <artifactId>dubbo-spring-boot-starter</artifactId> 13 <version>2.0.0</version> 14 </dependency> 15 <dependency> 16 <groupId>com.101tec</groupId> 17 <artifactId>zkclient</artifactId> 18 <version>0.3</version> 19 </dependency> 20 <dependency> 21 <groupId>org.apache.zookeeper</groupId> 22 <artifactId>zookeeper</artifactId> 23 <version>3.4.6</version> 24 </dependency> 25 </dependencies>
3、dubbo.properties文件配置：
1 spring.dubbo.application.name=provider_boot 2 spring.dubbo.registry.protocol=zookeeper 3 spring.dubbo.registry.address=127.0.0.1:2181 4 spring.dubbo.protocol.name=dubbo 5 spring.dubbo.protocol.port=20880 6 spring.dubbo.scan=com.demo.dubbo.provider
4、dubbo.xml文件配置：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans 5 http://www.springframework.org/schema/beans/spring-beans.xsd 6 http://code.alibabatech.com/schema/dubbo 7 http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> 8 9 <bean id="testIntf" class="com.demo.dubbo.provider.service.impl.TestIntfImpl" /> 10 11 <!-- 提供方应用信息，用于计算依赖关系 --> 12 <dubbo:application name="provider_boot" /> 13 <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181" /> 14 <!-- 暴露服务 --> 15 <dubbo:protocol name="dubbo" port="20880" /> 16 <dubbo:service interface="com.demo.dubbo.TestIntf" 17 ref="testIntf" retries="0" timeout="6000" /> 18 </beans>
5、配置类DubboConfig.java：
1 @Configuration 2 @PropertySource("/dubbo.properties") 3 @ImportResource({"/dubbo.xml"}) 4 public class DubboConfig { 5 }
6、服务实现类：
1 import com.alibaba.dubbo.config.annotation.Service; 2 3 @Service(version = "1.0.0") 4 public class TestIntfImpl implements TestIntf { 5 @Override 6 public String sayHello() { 7 return "this is a provider Demo for SpringBoot and Dubbo"; 8 } 9 }
7、Consumer程序的dubbo.properties文件定义：
1 spring.dubbo.application.name=consumer_boot 2 spring.dubbo.registry.protocol=zookeeper 3 spring.dubbo.registry.address=127.0.0.1:2181 4 spring.dubbo.protocol.name=dubbo 5 spring.dubbo.protocol.port=20880 6 spring.dubbo.scan=com.demo.dubbo.consumer
8、Consumer程序的dubbo.xml文件定义：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans 5 http://www.springframework.org/schema/beans/spring-beans.xsd 6 http://code.alibabatech.com/schema/dubbo 7 http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> 8 9 <!-- 提供方应用信息，用于计算依赖关系 --> 10 <dubbo:application name="consumer_boot" /> 11 <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181" /> 12 <!-- 暴露服务 --> 13 <dubbo:protocol name="dubbo" port="20880" /> 14 <dubbo:reference id="testIntf" interface="com.demo.dubbo.TestIntf" /> 15 </beans>
如果consumer和provider程序是在一台机器上运行的，那么这里就要在application.properties文件里面更改下端口；
9、配置文件DubboConfig.java文件定义：
1 @Configuration 2 @PropertySource("/dubbo.properties") 3 @ImportResource({"/dubbo.xml"}) 4 public class DubboConfig { 5 }
10、RPC服务调用的Controller的调用实现：
1 @RestController 2 @RequestMapping("/consumer") 3 public class IndexController { 4 5 @Resource 6 private TestIntf testIntf; 7 8 @GetMapping("/home") 9 public String index() { 10 return testIntf.sayHello(); 11 } 12 }
四、SpringBoot+nacos+Dubbo的搭建：
1、新建立两个SpringBoot工程provider和consumer；
2、POM.xml文件引入依赖（consumer工程的依赖是一样的）：
1 <properties> 2 <java.version>1.8</java.version> 3 <nacos-config-spring-boot.version>0.2.1</nacos-config-spring-boot.version> 4 <netty-all.version>4.0.35.Final</netty-all.version> 5 </properties> 6 7 <dependencies> 8 <!--springboot有关--> 9 <dependency> 10 <groupId>org.springframework.boot</groupId> 11 <artifactId>spring-boot-starter-actuator</artifactId> 12 </dependency> 13 <dependency> 14 <groupId>org.springframework.boot</groupId> 15 <artifactId>spring-boot-starter</artifactId> 16 </dependency> 17 <dependency> 18 <groupId>org.springframework.boot</groupId> 19 <artifactId>spring-boot-starter-web</artifactId> 20 </dependency> 21 <dependency> 22 <groupId>org.springframework.boot</groupId> 23 <artifactId>spring-boot-starter-test</artifactId> 24 <scope>test</scope> 25 </dependency> 26 27 <!--dubbo有关--> 28 <dependency> 29 <groupId>com.alibaba</groupId> 30 <artifactId>dubbo-registry-nacos</artifactId> 31 <version>2.6.6</version> 32 </dependency> 33 <dependency> 34 <groupId>com.alibaba.nacos</groupId> 35 <artifactId>nacos-client</artifactId> 36 <version>0.6.2</version> 37 </dependency> 38 <dependency> 39 <groupId>com.alibaba</groupId> 40 <artifactId>dubbo-common</artifactId> 41 <version>2.6.6</version> 42 </dependency> 43 <dependency> 44 <groupId>com.alibaba</groupId> 45 <artifactId>dubbo-registry-api</artifactId> 46 <version>2.6.6</version> 47 </dependency> 48 <dependency> 49 <groupId>com.alibaba</groupId> 50 <artifactId>dubbo</artifactId> 51 <version>2.6.6</version> 52 </dependency> 53 <dependency> 54 <groupId>com.alibaba.boot</groupId> 55 <artifactId>dubbo-spring-boot-starter</artifactId> 56 <version>0.2.1.RELEASE</version> 57 </dependency> 58 <dependency> 59 <groupId>com.alibaba.boot</groupId> 60 <artifactId>dubbo-spring-boot-autoconfigure</artifactId> 61 <version>0.2.1.RELEASE</version> 62 </dependency> 63 <dependency> 64 <groupId>io.netty</groupId> 65 <artifactId>netty-all</artifactId> 66 <version>${netty-all.version}</version> 67 </dependency> 68 <!-- rest有关 --> 69 <dependency> 70 <groupId>org.jboss.resteasy</groupId> 71 <artifactId>jaxrs-api</artifactId> 72 <version>3.0.12.Final</version> 73 </dependency> 74 <dependency> 75 <groupId>org.jboss.resteasy</groupId> 76 <artifactId>resteasy-client</artifactId> 77 <version>3.0.12.Final</version> 78 </dependency> 79 </dependencies>
3、Application.yml配置文件定义：
1 dubbo: 2 application: 3 name: provider-nacos-demo 4 id: provider-nacos-demo 5 registry: 6 address: nacos://127.0.0.1:8848 7 protocols: 8 dubbo: 9 name: dubbo 10 port: -1 11 server: tomcat 12 spring: 13 application: 14 name: provider-nacos-demo 15 main: 16 allow-bean-definition-overriding: true 17 server: 18 port: 8080
4、接口实现类：
1 import com.alibaba.dubbo.config.annotation.Service; 2 3 @Service 4 public class TestIntfImpl implements TestIntf { 5 6 @Override 7 public String sayHello() { 8 return "这是provider程序远程调用返回的结果"; 9 } 10 }
5、应用程序类ProviderApplication需要添加@EnableDubbo注解；consumer工程的应用程序类也要添加这个注解；
6、Consumer工程的application.yml配置如下：
1 dubbo: 2 application: 3 name: consumer-nacos-demo 4 id: consumer-nacos-demo 5 registry: 6 address: nacos://127.0.0.1:8848 7 protocols: 8 dubbo: 9 name: dubbo 10 port: -2 11 server: tomcat 12 spring: 13 application: 14 name: consumer-nacos-demo 15 main: 16 allow-bean-definition-overriding: true 17 server: 18 port: 8081
7、Controller中调用provider中的RPC服务代码：
1 import com.alibaba.dubbo.config.annotation.Reference; 2 import org.springframework.web.bind.annotation.GetMapping; 3 import org.springframework.web.bind.annotation.RequestMapping; 4 import org.springframework.web.bind.annotation.RestController; 5 6 @RestController 7 @RequestMapping("/consumer") 8 public class IndexController { 9 10 @Reference 11 private TestIntf testIntf; 12 13 @GetMapping("/home") 14 public String getUser(){ 15 String result = testIntf.sayHello(); 16 return result; 17 } 18 }