dubbo学习之Hello world
现在企业中使用dubbo的越来越多,今天就简单的学习一下dubbo,写了一个hello world,教程仅供入门,如要深入学习请上官网
服务提供方:
首先将提供方和消费方都引入jar包,如果使用的是maven管理项目,可以直接加入dubbo的配置
<!—dubbo start --> <dependency> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> <version>2.5.3</version> <exclusions> <exclusion> <groupId>org.springframework</groupId> <artifactId>spring</artifactId> </exclusion> </exclusions> </dependency> <!—dubbo end --> <!-- zookeeper start --> <dependency> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> <version></version> </dependency> <dependency> <groupId>com.101tec</groupId> <artifactId>zkclient</artifactId> <version>${zkclient_version}</version> </dependency> <!-- zookeeper end –>
声明接口:
public interface UserInfoService { String sayHello(String name); }
实现接口:
public class UserInfoServiceImpl implements UserInfoService{ public String sayHello(String name) { return name + " Hello !"; } }
配置applicationContext.xml文件:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xsi:schemaLocation="http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <dubbo:application name="hello-world-app"/> <!-- 注册地址 --> <dubbo:registry address="zookeeper://192.168.0.123:2181" ></dubbo:registry> <dubbo:protocol name="dubbo" port="20880"></dubbo:protocol> <dubbo:service ref="userInfoService" interface="com.zhiyi.service.UserInfoService" /> <!-- designate implementation --> <bean id="userInfoService" class="com.zhiyi.service.impl.UserInfoServiceImpl" /> </beans>
程序启动入口:
import org.springframework.context.support.ClassPathXmlApplicationContext; import com.google.common.util.concurrent.AbstractIdleService; public class BootStart extends AbstractIdleService{ ClassPathXmlApplicationContext context = null; public static void main(String[] args) { BootStart bootStart = new BootStart(); bootStart.startAsync(); try { Object lock = new Object(); synchronized (lock) { while(true){ lock.wait(); } } } catch (Exception e) { e.printStackTrace(); } } @Override protected void shutDown() throws Exception { if( context != null){ context.stop(); } } @Override protected void startUp() throws Exception { String configure = "applicationContext.xml"; ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(configure); String[] beans = context.getBeanDefinitionNames(); for( String bean : beans){ System.out.println("beanName:"+bean); } context.start(); context.registerShutdownHook(); System.out.println("provider is start!"); } }
服务消费方:
配置applicationContext.xml
注意:在消费方需要引入接口
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xsi:schemaLocation="http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <dubbo:application name="consumer-of-hello-world"/> <dubbo:registry address="zookeeper://192.168.0.123:2181"></dubbo:registry> <dubbo:reference id="userInfoService" interface="com.zhiyi.service.UserInfoService"></dubbo:reference> </beans>
服务消费方入口:
import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.zhiyi.service.UserInfoService; public class BootStart { public static void main(String[] args) { BootStart bootStart = new BootStart(); bootStart.start(); } public void start(){ String applicationConfig = "applicationContext.xml"; ApplicationContext context = new ClassPathXmlApplicationContext(applicationConfig); String[] beans = context.getBeanDefinitionNames(); for(String bean : beans){ System.out.println("beanName:"+bean); } UserInfoService userInfoService = (UserInfoService) context.getBean("userInfoService"); System.out.println(userInfoService.sayHello("zhangsan")); } }
好了,就是这么简单,dubbo的hello world就完成了,欢迎大神拍砖~