Dubbo的应用

Posted xiaowejie

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导语:Dubbo是阿里巴巴的一个分布式服务的开源框架,致力于提供高性能和透明化的RPC远程服务调用方案,是阿里巴巴SOA服务化治理方案的核心框架,每天为2,000+个服务提供3,000,000,000+次访问量支持,并被广泛应用于阿里巴巴集团的各成员站点。

  参考网站:http://dubbo.io/
1.dubbo-admin管理平台搭建(对消费者和生产者进行管理) zookeeper---服务注册中心
部署dubbo-admin:
软件下载:链接: http://pan.baidu.com/s/1midNOMk 密码: f2yy
1.安装jdk
2.安装tomcat
3.将dubbo-admin工程在tomcat上运行起来(要先运行zookeeper)
下载dubbo-admin包(dubbo-admin-2.5.4-SNAPSHOT.war
找到 tomcat安装路径下的 .\\webapps\\ROOT目录,然后清空里面的所有文件
dubbo-admin包(dubbo-admin-2.5.4-SNAPSHOT.war)解压到此文件中
在解压的文件中找到\\WEB-INF文件夹下的dubbo.properties文件,然后进行配置,默认属性配置如下:
  1. dubbo.registry.address=zookeeper://127.0.0.1:2181
  2. dubbo.admin.root.password=root
  3. dubbo.admin.guest.password=guest
然后启动tomcat(zookeeper已启动,此步tomcat要访问zookeeper,如果zk没有启动,tomcat会一直等待其启动)。在浏览器中输入localhost:8080,进入监控中心的管理界面(默认管理员账户密码为:root,root)
linux命令:
#清空ROOT里面的所有文件
yum install –y unzip
rm –rf /usr/local/tomcat/webapp/ROOT/* unzip dubbo-admin-2.5.4.war –d /usr/local/tomcat/webapp/ROOT
启动tomcat:./usr/local/tomcat/bin/startup.sh
安装zookeeper:(注意:zookeeper集群超过半数以上的机器挂掉,集群不可以,如:2n+1台server,只要有n+1台就可以使用。也就是你说的少于一半集群就无效了)
mkdir /home/lgp :创建包用于存放 zookeeper cp –rf zookeeper-3.4.6.tar.gz /home/lgp cd /home/lgp tar -xzvf zookeeper-3.4.6.tar.gz cd zookeeper-3.4.6/conf/ mv zoo_sample.cfg zoo.cfg vi zoo.cfg :参考详情
server.X=A:B:C # 其中X是一个数字, 表示这是第几号server. A是该server所在的IP地址. B配置该server和集群中的leader交换消息所使用的端口. C配置选举leader时所使用的端口. 这里的x是一个数字,与myid文件中的id是一致的。
单机版可以不用配置server.X=A:B:C
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/home/xudan/zookeeper-3.4.6/data #myid文件存放的路径
dataLogDir=/home/xudan/zookeeper-3.4.6/logs #日志存放路径
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1
server.1=Master:2555:3555
server.2=Slave1:2556:3556
server.3=Slave2:2557:3557
 
cd .. mkdir data mkdir logs touch /data/myid echo 1 > /home/lgp/ zookeeper-3.4.6/data/myid //设置myid的值为1
   vi /etc/hosts //设置host

 
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
127.0.0.1 root
127.0.0.1 localhost
192.168.1.63 Master
192.168.1.53 Slave1
192.168.1.54 Slave2

 
b、集群(把单台zookeeper的配置copy到其他机器上,改下hosts和对应的myid,根据zoo.cfg的配置)
复制:对应的机器创建 /home/lgp yum -y install openssh-clients 修改对应 myid ,etc/hosts scp /home/lgp/zookeeper-3.4.6 192.168.1.81:/home/lgp //跨机器复制 启动服务: service iptables stop:分别关闭对应机器的 iptables cd /home/lgp/zookeeper-3.4.6/bin ./bin/zkServer.sh start :开启zookeeper ./bin/zkServer.sh status :状态查询 ./bin/zkServer.sh stop :关闭zookeeper
2、dubbo整合Zookeeper
cd /usr/local/tomcat/webapp/ROOT/WEB-INF vi dubbo.properties

dubbo.registry.address=zookeeper://192.168.1.63:2181?backup=192.168.1.53:2181,192.168.1.54:2181 //backup是配合zookeeper挂掉后的替代
dubbo.admin.root.password=root
dubbo.admin.guest.password=guest

 
最后,先起zookeeper在启动tomcat
4.登录dubbo(账号密码都是:root)
 
2.zookeeper注册中心的配置安装(service在zookeeper上注册运行)
 
3.dubbo项目整合SpringMVC(maven)
1、下载jar:
maven导入所需jar包:dubbo、zookeeper、zkclient <dependency> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> <version>2.5.3</version> </dependency> <!-- Zookeeper 用于分布式服务管理 --> <dependency> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> <version>3.4.5</version> </dependency> <dependency> <groupId>com.101tec</groupId> <artifactId>zkclient</artifactId> <version>0.3</version> </dependency> <!-- Zookeeper 用于分布式服务管理 end -->
2、eclipse配置dubbo.xsd,解决标签不识别的问题
    百度云盘:https://pan.baidu.com/s/1nuIKgMd
3、在.properties配置zookeeper的注册地址
dubbo.registry.address=192.168.1.72:2181\\,192.168.1.73:2182\\,192.168.1.74:2183
4、service提供服务:spring-dubbo-provider.xml(生产者)
<?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="guduo-service-user" /> <!-- 使用zookeeper注册中心暴露服务地址 --> <dubbo:registry protocol="zookeeper" address="${dubbo.registry.address}" />   <!—本机 --> <dubbo:protocol name="dubbo" port="20823" /> <!-- 监控中心配置,protocol="registry",表示从注册中心发现监控中心地址 --> <dubbo:monitor protocol="registry"/> <!-- 当ProtocolConfig和ServiceConfig某属性没有配置时,采用此缺省值 --> <dubbo:provider timeout="30000" threadpool="fixed" threads="100" accepts="1000" /> <!-- 服务接口 --> <dubbo:service retries="0" interface="com.guduo.service.system.UserReportService" ref="userReportService" /> <dubbo:service retries="0" interface="com.guduo.service.system.UserSuggestionService" ref="userSuggestionService" /> </beans>
  spring-context.xml引入spring-dubbo-provider.xml
5、consumer注册服务:dubbo-consumer.xml(消费者)
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <!-- 消费方应用名,用于计算依赖关系,不是匹配条件,不要与提供方一样 --> <dubbo:application name="guduo-web-publish" /> <!-- 使用zookeeper注册中心暴露服务地址 --> <!-- 注册中心地址 --> <dubbo:registry protocol="zookeeper" address="${dubbo.registry.address}" /> <!-- 用户服务接口 --> <dubbo:reference interface="com.guduo.service.user.PmsActionService" id="pmsActionService" check="false"/> <dubbo:reference interface="com.guduo.service.user.PmsMenuService" id="pmsMenuService" check="false"/> </beans>
 
4、开发阶段,启动Dubbo服务
  建议放在"src/test"目录下面
import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.context.support.ClassPathXmlApplicationContext; /** * * @描述: 启动Dubbo服务用的MainClass. * @作者: 刘广平 * @创建时间: 2016-9-5,下午9:47:55 . * @版本: 1.0 . */ public class DubboProvider { private static final Log log = LogFactory.getLog(DubboProvider.class); public static void main(String[] args) { try { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring/spring-context.xml"); context.start(); } catch (Exception e) { log.error("== DubboProvider context start error:",e); } synchronized (DubboProvider.class) { while (true) { try { DubboProvider.class.wait(); } catch (InterruptedException e) { log.error("== synchronized error:",e); } } } } }

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