Dubbo 简单的应用Dubbo+Zookeeper+Spring整合

一、Zookeeper是什么？为何使用Zookeeper？

Zookeeper是一个分布式的服务框架，是树型的目录服务的数据存储，能做到集群管理数据 ，这里能很好的作为Dubbo服务的注册中心。

Dubbo能与Zookeeper做到集群部署，当提供者出现断电等异常停机时，Zookeeper注册中心能自动删除提供者信息，当提供者重启时，能自动恢复注册数据，以及订阅请求

二、创建MAVEN项目

主要分三大模块： 
dubbo-api1 : 存放公共接口； 最终会打为jar包，供consumer和provider1引用。
dubbo-provider1 : 提供远程服务； 包含api1接口的实现类，提供服务的实现逻辑。

dubbo-consumer :　调用远程服务；

 2.1 dubbo-api1 maven 

项目只有一个文件，是一个接口，他定义了统一的接口让provider1和consumer来引用：

public interface UserService {String sayHello(String name);}

之后打包jar！

 2.2 dubbo-provider1 maven

项目只有两个类，一个是服务实现类UserServiceImpl

package com.hlx.provider;import java.text.SimpleDateFormat;import java.util.Date;import com.alibaba.dubbo.rpc.RpcContext;import com.hlx.service.UserService;/** * 实现业务接口 * @author Administrator * */public class UserServiceImpl implements UserService {public String sayHello(String arg0) {System.out.println("["+ new SimpleDateFormat("HH:mm:ss").format(new Date())+ "] Hello " + arg0 + ", request from consumer: "+ RpcContext.getContext().getRemoteAddress());return "Hello " + arg0 + ", response form provider: "+ RpcContext.getContext().getLocalAddress();}}

Main测试

package com.hlx.provider;/** * 该类是dubbo框架提供，作用是启动dubbo服务，dubbo会在启动服务时， * 读取classpath下一个名为dubbo.properties文件的属性值 *  * @author Administrator *  */public class Main {public static void main(String[] args) {com.alibaba.dubbo.container.Main.main(args);}}

dubbo.properties文件配置：

dubbo.container=springdubbo.spring.config=classpath:dubbo-provider.xmldubbo.protocol.name=dubbodubbo.protocol.port=20880

dubbo-provider1.xml文件配置：

<?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-provider" /><!-- 使用zookeeper分布式服务注册中心暴露服务地址 --><dubbo:registry protocol="zookeeper" address="127.0.0.1:2181" /><!-- 用dubbo协议在20880端口暴露服务 --><dubbo:protocol name="dubbo" port="20880" /><!-- 指定了集群容错模式，此处为快速失败 --><!-- 和本地bean一样实现服务 --><bean id="userService" class="com.hlx.provider.UserServiceImpl" /><!-- 声明需要暴露的服务接口 --><dubbo:service interface="com.hlx.service.UserService"ref="userService" /></beans>

pom.xml文件

<dependencies><!-- https://mvnrepository.com/artifact/com.alibaba/dubbo --><dependency><groupId>com.alibaba</groupId><artifactId>dubbo</artifactId><version>2.5.5</version></dependency><dependency><groupId>org.apache.zookeeper</groupId><artifactId>zookeeper</artifactId><version>3.4.8</version></dependency><!-- https://mvnrepository.com/artifact/io.netty/netty --><dependency><groupId>io.netty</groupId><artifactId>netty</artifactId><version>3.7.0.Final</version></dependency><!-- https://mvnrepository.com/artifact/jline/jline --><dependency><groupId>jline</groupId><artifactId>jline</artifactId><version>0.9.94</version></dependency><!-- 自己写的公共接口 --><dependency><groupId>com.dubbo.demo</groupId><artifactId>dubbo-api1</artifactId><version>0.0.1-SNAPSHOT</version></dependency><dependency><groupId>com.github.sgroschupf</groupId><artifactId>zkclient</artifactId><version>0.1</version></dependency></dependencies>

2.3 dubbo-consumer maven

UserController类就是控制器，使用requestMapping注解提供http接口服务

@RestControllerpublic class UserController {@Autowiredprivate UserService userService;@RequestMapping("/hello")@ResponseBodypublic String hello(String name) throws Exception {                 System.out.println("controol==>");return userService.sayHello(name);}}

dubbo-consumer.xml文件配置

<?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:p="http://www.springframework.org/schema/p"xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://code.alibabatech.com/schema/dubbo    http://code.alibabatech.com/schema/dubbo/dubbo.xsd"><!-- 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 --><dubbo:application name="dubbo-consumer" /><!-- 使用zookeeper分布式服务注册中心暴露服务地址 --><dubbo:registry address="zookeeper://127.0.0.1:2181" />       <!-- 生成远程服务代理，可以和本地bean一样使用demoService -->    <dubbo:reference id="userService" check="false" interface="com.hlx.service.UserService"/></beans>

spring-config.xml文件配置

<?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:context="http://www.springframework.org/schema/context"       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"       default-autowire="byName">    <!-- 开启注解配置 -->    <context:annotation-config/>    <import resource="classpath:dubbo-consumer.xml"/></beans>

spring-mvc.xml 文件配置

<?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:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"><!-- 配置自动扫描的包路径 --><context:component-scan base-package="com.hlx.controller" /></beans>

web.xml配置文件

  <!-- 配置Spring配置文件路径 -->    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>            classpath*:spring-config.xml        </param-value>    </context-param>    <!-- 配置Spring上下文监听器 -->    <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>    </listener>    <servlet>        <servlet-name>dispatcher</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <init-param>            <param-name>contextConfigLocation</param-name>            <param-value>classpath*:spring-mvc.xml</param-value>        </init-param>        <load-on-startup>1</load-on-startup>    </servlet>    <servlet-mapping>        <servlet-name>dispatcher</servlet-name>        <url-pattern>*.action</url-pattern>    </servlet-mapping>

配置pom.xml文件

  <dependencies>   <!-- https://mvnrepository.com/artifact/com.alibaba/dubbo --><dependency><groupId>com.alibaba</groupId><artifactId>dubbo</artifactId><version>2.5.5</version></dependency><dependency><groupId>org.apache.zookeeper</groupId><artifactId>zookeeper</artifactId><version>3.4.8</version></dependency><!-- 自己写的公共接口 --> <dependency><groupId>com.dubbo.demo</groupId><artifactId>dubbo-api1</artifactId><version>0.0.1-SNAPSHOT</version></dependency> <dependency><groupId>com.github.sgroschupf</groupId><artifactId>zkclient</artifactId><version>0.1</version></dependency><!-- spring包 --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>4.3.10.RELEASE</version></dependency>  <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context-support</artifactId>            <version>4.3.10.RELEASE</version>        </dependency>                <dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>4.3.10.RELEASE</version></dependency>  </dependencies>

注意：provider1与consumer必须导入公共api1包哦！

(1)zookeeper服务启动起来。

(2)dubbo-provider1 服务器运行起来；

(3)dubbo-consumer 部署到Tomcat上！运行起来；

显示效果：

 IE : http://localhost:8888/dubbo-consumer/hello.action?name=Mike