spring + dubbo 学习
新启动的项目中可能会使用到dubbo,因为之前并没有接触过,所以先小试一下
示例运行环境准备:OS X 10.10.5 + java version "1.8.0_40"
zookeeper 和 dubbo-admin运行在虚拟机上,环境为Centos7.0 + java version "1.8.0_73"
项目使用gradlle管理
其中dubbo-demo未项目,里面新建了两个module,api为服务提供方,console为服务消费方。注意,需要在console module中添加api 的module依赖
api中代码如下:
DemoService
package com.dh.demo.service; public interface DemoService { public String hello(String name); }
DemoServiceImpl
package com.dh.demo.service.impl; import com.dh.demo.service.DemoService; public class DemoServiceImpl implements DemoService { public String hello(String name) { return "hello " + name; } }
服务端spring配置文件dubbo-provider.xml文件内容如下
<?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://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <!-- 提供方应用信息,用于计算依赖关系 --> <dubbo:application name="dubbo-demo-api"/> <!-- 使用zookeeper注册中心暴露服务地址 --> <dubbo:registry address="zookeeper://vm:2181"/> <bean id="demoService" class="com.dh.demo.service.impl.DemoServiceImpl"/> <!-- 声明需要暴露的服务接口 --> <dubbo:service interface="com.dh.demo.service.DemoService" ref="demoService"/> </beans>
启动api的测试代码如下:
package com.dh.test; import org.springframework.context.support.ClassPathXmlApplicationContext; import java.io.IOException; public class Provider { public static void main(String[] args) { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("file:/xxx/dubbo-demo/api/src/resources/dubbo-provider.xml"); context.start(); try { System.in.read(); } catch (IOException e) { e.printStackTrace(); } } }
服务提供者的配置到此结束。
下面是消费者的配置和代码
spring配置文件dubbo-consumer.xml内容如下
<?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://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <dubbo:application name="dubbo-demo-console"></dubbo:application> <!-- 使用zookeeper注册中心暴露服务地址 --> <dubbo:registry address="zookeeper://vm:2181"/> <!-- 要引用的服务 --> <dubbo:reference interface="com.dh.demo.service.DemoService" id="demoService"></dubbo:reference> </beans>
启动消费者测试的代码如下
Consumer:
package com.dh.test; import com.dh.demo.service.DemoService; import org.springframework.context.support.ClassPathXmlApplicationContext; import java.io.IOException; public class Consumer { public static void main(String[] args) { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("file:/xxx/dubbo-demo/console/src/resources/dubbo-consumer.xml"); context.start(); DemoService testRegistryService = (DemoService)context.getBean("demoService"); // 获取远程服务代理 String hello = testRegistryService.hello("world"); System.out.println(hello); try { System.in.read(); } catch (IOException e) { e.printStackTrace(); } } }
先运行提供者测试代码,再运行消费者代码。可以看到下面输出
至此测试成功
如果运行了dubbo-admin的话可以进去后可以查看和管理服务
这是提供者:
消费者:
有些童鞋可能不知道怎么运行dubbo-demo
看dubbo的github主页就行
如果再jdk8的环境下运行可能在启动的时候会遇到如下问题
Bean property 'URIType' is not writable or has 。。。。。后面省略
解决方式参考:https://github.com/alibaba/dubbo/issues/50 中 stirp 的方式即可
注:dubbo-demo的build.gradle内容如下
group 'com.dh'
version '1.0-SNAPSHOT'
apply plugin: 'java'
sourceCompatibility = 1.5
repositories {
maven { url "http://repo.maven.apache.org/maven2" }
}
dependencies {
compile(group: 'com.alibaba', name: 'dubbo', version: '2.5.3') {
exclude(module: 'spring')
}
compile group: 'org.apache.zookeeper', name: 'zookeeper', version: '3.4.6'
compile group: 'com.google.zxing', name: 'core', version: '3.1.0'
compile group: 'com.google.code.gson', name: 'gson', version: '2.3.1'
compile group: 'io.netty', name: 'netty', version: '4.0.0.Alpha8'
compile group: 'javax.servlet', name: 'servlet-api', version: '2.5'
compile group: 'org.springframework', name: 'spring-context-support', version: '4.1.3.RELEASE'
compile group: 'org.springframework', name: 'spring-web', version: '4.1.3.RELEASE'
compile group: 'org.springframework', name: 'spring-webmvc', version: '4.1.3.RELEASE'
compile group: 'com.alibaba', name: 'fastjson', version: '1.2.7'
compile group: 'org.apache.httpcomponents', name: 'httpclient', version: '4.3.5'
compile group: 'com.fasterxml.jackson.dataformat', name: 'jackson-dataformat-xml', version: '2.6.3'
compile group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.6.3'
compile group: 'com.thoughtworks.xstream', name: 'xstream', version: '1.4.2'
compile group: 'org.jdom', name: 'jdom', version: '1.1.3'
compile group: 'com.github.sgroschupf', name: 'zkclient', version: '0.1'
}