在Dubbo+zookeeper構建高可用分布式集群(一)-單機部署中我們講了如何單機部署。但沒有將如何配置微服務。下面分別介紹單機與集群微服務如何配置注冊中心。
Zookeeper單機配置:
方式一、
<dubbo:registry address="zookeeper://10.20.153.10:2181"/>
方式二、
<dubbo:registry protocol="zookeeper" address="10.20.153.10:2181"/>
Zookeeper集群配置:
方式一、
<dubbo:registry address="zookeeper://10.20.153.10:2181?backup=10.20.153.11:2181,10.20.153.12:2181"/>
方式二、
<dubbo:registry
protocol="zookeeper"
address="10.20.153.10:2181,10.20.153.11:2181,10.20.153.12/>
集群配置方式一,特別適用於dubbo-admin 和dubbo-monitor
Zookeeper是什么:
Zookeeper,一種分布式應用的協作服務,是Google的Chubby一個開源的實現,是Hadoop的分布式協調服務,它包含一個簡單的原語集,應用於分布式應用的協作服務,使得分布式應用可以基於這些接口實現諸如同步、配置維護和分集群或者命名的服務。
zookeeper是一個由多個service組成的集群,一個leader,多個follower,每個server保存一份數據部分,全局數據一致,分布式讀寫,更新請求轉發由leader實施.
更新請求順序進行,來自同一個client的更新請求按其發送順序依次執行,數據更新原子性,一次數據更新要么成功,要么失敗,全局唯一數據試圖,client無論連接到哪個server,數據試圖是一致的.
為什么要用zookeeper
大部分分布式應用需要一個主控、協調器或控制器來管理物理分布的子進程(如資源、任務分配等),目前,大部分應用需要開發私有的協調程序,缺乏一個通用的機制.協調程序的反復編寫浪費,且難以形成通用、伸縮性好的協調器,ZooKeeper:提供通用的分布式鎖服務,用以協調分布式應用
zookeeper工作原理
zookeeper的核心是原子廣播,這個機制保證了各個server之間的同步,實現這個機制的協議叫做Zab協議.Zab協議有兩種模式,他們分別是恢復模式和廣播模式.
1.當服務啟動或者在領導者崩潰后,Zab就進入了恢復模式,當領導着被選舉出來,且大多數server都完成了和leader的狀態同步后,恢復模式就結束了.狀態同步保證了leader和server具有相同的系統狀態.
2.一旦leader已經和多數的follower進行了狀態同步后,他就可以開始廣播消息了,即進入廣播狀態.這時候當一個server加入zookeeper服務中,它會在恢復模式下啟動,發下leader,並和leader進行狀態同步,待到同步結束,它也參與廣播消息.
說明:
廣播模式需要保證proposal被按順序處理,因此zk采用了遞增的事務id號(zxid)來保證.所有的提議(proposal)都在被提出的時候加上了zxid.實現中zxid是一個64為的數字,它高32位是epoch用來標識leader關系是否改變,每次一個leader被選出來,它都會有一個新的epoch.低32位是個遞增計數.
當leader崩潰或者leader失去大多數的follower,這時候zk進入恢復模式,恢復模式需要重新選舉出一個新的leader,讓所有的server都恢復到一個正確的狀態.
zookeeper服務一致維持在Broadcast狀態,直到leader崩潰了或者leader失去了大部分的followers支持.
Broadcast模式極其類似於分布式事務中的2pc(two-phrase commit兩階段提交):即leader提起一個決議,由followers進行投票,leader對投票結果進行計算決定是否通過該決議,如果通過執行該決議(事務),否則什么也不做.
Leader選舉
每個Server啟動以后都詢問其它的Server它要投票給誰,對於其他server的詢問,server每次根據自己的狀態都回復自己推薦的leader的id和上一次處理事務的zxid(系統啟動時每個server都會推薦自己),收到所有Server回復以后,就計算出zxid最大的哪個Server,並將這個Server相關信息設置成下一次要投票的Server.計算這過程中獲得票數最多的的sever為獲勝者,如果獲勝者的票數超過半數,則改server被選為leader.否則,繼續這個過程,直到leader被選舉出來.leader就會開始等待server連接,Follower連接leader,將最大的zxid發送給leader,Leader根據follower的zxid確定同步點,完成同步后通知follower已經成為uptodate狀態,Follower收到uptodate消息后,又可以重新接受client的請求進行服務了.
zookeeper的數據模型
層次化的目錄結構,命名符合常規文件系統規范
每個節點在zookeeper中叫做znode,並且其有一個唯一的路徑標識
節點Znode可以包含數據和子節點,但是EPHEMERAL類型的節點不能有子節點
Znode中的數據可以有多個版本,比如某一個路徑下存有多個數據版本,那么查詢這個路徑下的數據就需要帶上版本
客戶端應用可以在節點上設置監視器,節點不支持部分讀寫,而是一次性完整讀寫
Zoopkeeper 提供了一套很好的分布式集群管理的機制,就是它這種基於層次型的目錄樹的數據結構,並對樹中的節點進行有效管理,從而可以設計出多種多樣的分布式的數據管理模型
Zookeeper的節點
Znode有兩種類型,短暫的(ephemeral)和持久的(persistent)
Znode的類型在創建時確定並且之后不能再修改
短暫znode的客戶端會話結束時,zookeeper會將該短暫znode刪除,短暫znode不可以有子節點
持久znode不依賴於客戶端會話,只有當客戶端明確要刪除該持久znode時才會被刪除
Znode有四種形式的目錄節點,PERSISTENT、PERSISTENT_SEQUENTIAL、EPHEMERAL、EPHEMERAL_SEQUENTIAL.
znode 可以被監控,包括這個目錄節點中存儲的數據的修改,子節點目錄的變化等,一旦變化可以通知設置監控的客戶端,這個功能是zookeeper對於應用最重要的特性,
通過這個特性可以實現的功能包括配置的集中管理,集群管理,分布式鎖等等.
Zookeeper的角色
領導者(leader),負責進行投票的發起和決議,更新系統狀態
學習者(learner),包括跟隨者(follower)和觀察者(observer).
follower用於接受客戶端請求並想客戶端返回結果,在選主過程中參與投票
Observer可以接受客戶端連接,將寫請求轉發給leader,但observer不參加投票過程,只同步leader的狀態,observer的目的是為了擴展系統,提高讀取速度
客戶端(client),請求發起方
Watcher
Watcher 在 ZooKeeper是一個核心功能,Watcher可以監控目錄節點的數據變化以及子目錄的變化,一旦這些狀態發生變化,服務器就會通知所有設置在這個目錄節點上的Watcher,從而每個客戶端都很快知道它所關注的目錄節點的狀態發生變化,而做出相應的反應
可以設置觀察的操作:exists,getChildren,getData
可以觸發觀察的操作:create,delete,setData
znode以某種方式發生變化時,“觀察”(watch)機制可以讓客戶端得到通知.
可以針對ZooKeeper服務的“操作”來設置觀察,該服務的其他 操作可以觸發觀察.
比如,客戶端可以對某個客戶端調用exists操作,同時在它上面設置一個觀察,如果此時這個znode不存在,則exists返回false,如果一段時間之后,這個znode被其他客戶端創建,則這個觀察會被觸發,之前的那個客戶端就會得到通知.
Zookeeper集群搭建
Zookeeper 不僅可以單機提供服務,同時也支持多機組成集群來提供服務,實際上Zookeeper還支持另外一種偽集群的方式,也就是可以在一台物理機上運行多個Zookeeper實例.
Zookeeper通過復制來實現高可用性,只要集合體中半數以上的機器處於可用狀態,它就能夠保證服務繼續。
集群容災性:
3台機器只要有2台可用就可以選出leader並且對外提供服務(2n+1台機器,可以容n台機器掛掉)。
Zookeeper偽分布式環境搭建:
1、去Zookeeper官網下載最新版本的Zookeeper.
[root@localhost zookeeper-cluster]# pwd
/export/search/zookeeper-cluster
[root@localhost zookeeper-cluster]# ls
zookeeper-3.4.6.tar.gz
[root@localhost zookeeper-cluster]#
[root@localhost zookeeper-cluster]# tar -zxvf zookeeper-3.4.6.tar.gz
#創建第一個集群節點
[root@localhost zookeeper-cluster]# mv zookeeper-3.4.6 zookeeper-3.4.6-node1
[root@localhost zookeeper-cluster]# cd zookeeper-3.4.6-node1
[root@localhost zookeeper-3.4.6-node1]# pwd
/export/search/zookeeper-cluster/zookeeper-3.4.6-node1
#創建數據存放路徑
[root@localhost zookeeper-3.4.6-node1]# mkdir data
[root@localhost zookeeper-3.4.6-node1]# cd ../
#創建第二第三個集群節點
[root@localhost zookeeper-cluster]# cp zookeeper-3.4.6-node1 zookeeper-3.4.6-node2 -R
[root@localhost zookeeper-cluster]# cp zookeeper-3.4.6-node1 zookeeper-3.4.6-node3 -R
[root@localhost zookeeper-cluster]# ls
zookeeper-3.4.6-node1 zookeeper-3.4.6-node2 zookeeper-3.4.6-node3 zookeeper-3.4.6.tar.gz
[root@localhost zookeeper-cluster]# cd zookeeper-3.4.6-node1/conf/
[root@localhost conf]# ls
configuration.xsl log4j.properties zoo_sample.cfg
#創建zoo.cfg文件
[root@localhost conf]# cp zoo_sample.cfg zoo.cfg
2、配置zoo.cfg文件:
#zookeeper-3.4.6-node1的配置
tickTime=2000
initLimit=10
syncLimit=5
clientPort=2181
dataDir=/export/search/zookeeper-cluster/zookeeper-3.4.6-node1/data
server.1=localhost:2887:3887
server.2=localhost:2888:3888
server.3=localhost:2889:3889
#zookeeper-3.4.6-node2的配置
tickTime=2000
initLimit=10
syncLimit=5
clientPort=2182
dataDir=/export/search/zookeeper-cluster/zookeeper-3.4.6-node2/data
server.1=localhost:2887:3887
server.2=localhost:2888:3888
server.3=localhost:2889:3889
#zookeeper-3.4.6-node3的配置
tickTime=2000
initLimit=10
syncLimit=5
clientPort=2183
dataDir=/export/search/zookeeper-cluster/zookeeper-3.4.6-node3/data
server.1=localhost:2887:3887
server.2=localhost:2888:3888
server.3=localhost:2889:3889
參數說明:
tickTime=2000:
tickTime這個時間是作為Zookeeper服務器之間或客戶端與服務器之間維持心跳的時間間隔,也就是每個tickTime時間就會發送一個心跳;
initLimit=10:
initLimit這個配置項是用來配置Zookeeper接受客戶端(這里所說的客戶端不是用戶連接Zookeeper服務器的客戶端,而是Zookeeper服務器集群中連接到Leader的Follower服務器)初始化連接時最長能忍受多少個心跳時間間隔數。
當已經超過10個心跳的時間(也就是tickTime)長度后Zookeeper 服務器還沒有收到客戶端的返回信息,那么表明這個客戶端連接失敗。總的時間長度就是10*2000=20 秒;
syncLimit=5:
syncLimit這個配置項標識Leader與Follower之間發送消息,請求和應答時間長度,最長不能超過多少個tickTime的時間長度,總的時間長度就是5*2000=10秒;
dataDir=/export/search/zookeeper-cluster/zookeeper-3.4.6-node1/data
dataDir顧名思義就是Zookeeper保存數據的目錄,默認情況下Zookeeper將寫數據的日志文件也保存在這個目錄里;
clientPort=2181
clientPort這個端口就是客戶端連接Zookeeper服務器的端口,Zookeeper會監聽這個端口接受客戶端的訪問請求;
server.1=localhost:2887:3887
server.2=localhost:2888:3888
server.3=localhost:2889:3889
server.A=B:C:D:
A是一個數字,表示這個是第幾號服務器,B是這個服務器的ip地址
C第一個端口用來集群成員的信息交換,表示的是這個服務器與集群中的Leader服務器交換信息的端口
D是在leader掛掉時專門用來進行選舉leader所用
3、創建ServerID標識
除了修改zoo.cfg配置文件,集群模式下還要配置一個文件myid,這個文件在dataDir目錄下,這個文件里面就有一個數據就是A的值,在上面配置文件中zoo.cfg中配置的dataDir路徑中創建myid文件
[root@localhost zookeeper-cluster]# cat /export/search/zookeeper-cluster/zookeeper-3.4.6-node1/data/myid
1
[root@localhost zookeeper-cluster]# cat /export/search/zookeeper-cluster/zookeeper-3.4.6-node2/data/myid
2
[root@localhost zookeeper-cluster]# cat /export/search/zookeeper-cluster/zookeeper-3.4.6-node3/data/myid
3
4、啟動zookeeper
[root@localhost zookeeper-cluster]# /export/search/zookeeper-cluster/zookeeper-3.4.6-node1/bin/zkServer.sh start
JMX enabled by default
Using config: /export/search/zookeeper-cluster/zookeeper-3.4.6-node1/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@localhost zookeeper-cluster]# /export/search/zookeeper-cluster/zookeeper-3.4.6-node2/bin/zkServer.sh start
JMX enabled by default
Using config: /export/search/zookeeper-cluster/zookeeper-3.4.6-node2/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@localhost zookeeper-cluster]# /export/search/zookeeper-cluster/zookeeper-3.4.6-node3/bin/zkServer.sh start
JMX enabled by default
Using config: /export/search/zookeeper-cluster/zookeeper-3.4.6-node3/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
5、檢測集群是否啟動
[root@localhost zookeeper-cluster]# echo stat|nc localhost 2181
[root@localhost zookeeper-cluster]# echo stat|nc localhost 2182
[root@localhost zookeeper-cluster]# echo stat|nc localhost 2183
#或者
[root@localhost zookeeper-cluster]# /export/search/zookeeper-cluster/zookeeper-3.4.6-node1/bin/zkCli.sh
[root@localhost zookeeper-cluster]# /export/search/zookeeper-cluster/zookeeper-3.4.6-node2/bin/zkCli.sh
[root@localhost zookeeper-cluster]# /export/search/zookeeper-cluster/zookeeper-3.4.6-node3/bin/zkCli.sh
偽集群部署注意事項:
在一台機器上部署了3個server;需要注意的是clientPort這個端口,如果在1台機器上部署多個server,那么每個server都要有不同的clientPort.
比如 server.1是2181,server.2是2182,server.3是2183
最后幾行唯一需要注意的地方就是
server.X 這個數字就是對應 data/myid中的數字。你在3個server的myid文件中分別寫入了1,2,3,那么每個server中的zoo.cfg都配server.1,server.2,server.3就OK了
集成dubbo時的配置:
提供者:
<dubbo:registry protocol="zookeeper" address="192.168.8.101:2181,192.168.8.101:2182,192.168.8.101:2183" />
消費者:
<dubbo:registry protocol="zookeeper" address="192.168.8.101:2181,192.168.8.101:2182,192.168.8.101:2183" />
具體詳情可以參考:https://github.com/alibaba/dubbo



第三步:創建提供者

- <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
- <modelVersion>4.0.0</modelVersion>
- <groupId>com.test</groupId>
- <artifactId>service</artifactId>
- <version>0.0.1-SNAPSHOT</version>
- </project>
- <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
- <modelVersion>4.0.0</modelVersion>
- <groupId>com.test</groupId>
- <artifactId>provider02</artifactId>
- <version>0.0.1-SNAPSHOT</version>
- <dependencies>
- <dependency>
- <groupId>com.test</groupId>
- <artifactId>service</artifactId>
- <version>0.0.1-SNAPSHOT</version>
- </dependency>
- <dependency>
- <groupId>com.alibaba</groupId>
- <artifactId>dubbo</artifactId>
- <version>2.5.3</version>
- </dependency>
- <dependency>
- <groupId>org.apache.zookeeper</groupId>
- <artifactId>zookeeper</artifactId>
- <version>3.3.3</version>
- </dependency>
- <!-- 日志相關 -->
- <dependency>
- <groupId>log4j</groupId>
- <artifactId>log4j</artifactId>
- <version>1.2.16</version>
- </dependency>
- <dependency>
- <groupId>org.slf4j</groupId>
- <artifactId>slf4j-api</artifactId>
- <version>1.7.5</version>
- </dependency>
- <!-- zookeeper client依賴,用於向zookeeper注冊服務 -->
- <dependency>
- <groupId>com.github.sgroschupf</groupId>
- <artifactId>zkclient</artifactId>
- <version>0.1</version>
- </dependency>
- </dependencies>
- <build>
- <pluginManagement>
- <plugins>
- <plugin>
- <groupId>org.apache.maven.plugins</groupId>
- <artifactId>maven-jar-plugin</artifactId>
- <configuration>
- <source>1.8</source>
- <target>1.8</target>
- <archive>
- <manifest>
- <mainClass>com.test.provider.Provider</mainClass>
- <addClasspath>true</addClasspath>
- <classpathPrefix>lib/</classpathPrefix>
- </manifest>
- </archive>
- <classesDirectory>
- </classesDirectory>
- </configuration>
- </plugin>
- </plugins>
- </pluginManagement>
- </build>
- </project>
- package com.test.service;
- /**
- * @author xianghui1
- *
- *test
- */
- public interface TestService {
- public String test();
- }
- package com.test.service;
- import com.test.service.TestService;
- public class TestServiceImpl implements TestService {
- public String test() {
- System.out.println("test success");
- return "provider02";
- }
- }
- package com.test.service;
- import com.test.service.TestService;
- public class TestServiceImpl implements TestService {
- public String test() {
- System.out.println("test success");
- return "provider01";
- }
- }
- <?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"
- xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop"
- xmlns:tx="http://www.springframework.org/schema/tx"
- xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
- http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
- http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
- http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
- <context:component-scan base-package="com.test" />
- </beans>
- log4j.appender.mylog = org.apache.log4j.ConsoleAppender
- log4j.appender.mylog.target = System.out
- log4j.appender.mylog.layout= org.apache.log4j.PatternLayout
- log4j.appender.mylog.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [%c]-[%p] %m%n
- log4j.appender.my2log = org.apache.log4j.RollingFileAppender
- log4j.appender.my2log.File = D://Logger//mylog.log
- log4j.appender.my2log.MaxFileSize = 50KB
- log4j.appender.my2log.MaxBackupIndex = 1
- log4j.appender.my2log.layout= org.apache.log4j.PatternLayout
- log4j.appender.my2log.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [%c]-[%p] %m%n
- log4j.rootLogger = info,mylog,my2log
- <?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">
- <!-- 提供方應用信息,用於計算依賴關系 -->
- <dubbo:application name="provider" />
- <!-- 使用zookeeper廣播注冊中心暴露服務地址 -->
- <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
- <!-- 用dubbo協議在20880端口暴露服務 -->
- <dubbo:protocol name="dubbo" port="20881" />
- <!-- 和本地bean一樣實現服務 -->
- <bean id="testService" class="com.test.service.TestServiceImpl" />
- <!-- 聲明需要暴露的服務接口 -->
- <dubbo:service interface="com.test.service.TestService" ref="testService" />
- </beans>
- <?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">
- <!-- 提供方應用信息,用於計算依賴關系 -->
- <dubbo:application name="provider" />
- <!-- 使用zookeeper廣播注冊中心暴露服務地址 -->
- <dubbo:registry address="zookeeper://10.120.106.35:2181" />
- <!-- 用dubbo協議在20880端口暴露服務 -->
- <dubbo:protocol name="dubbo" port="20882" />
- <!-- 和本地bean一樣實現服務 -->
- <bean id="testService" class="com.test.service.TestServiceImpl" />
- <!-- 聲明需要暴露的服務接口 -->
- <dubbo:service interface="com.test.service.TestService" ref="testService" />
- </beans>
- package com.test.provider;
- import org.apache.log4j.PropertyConfigurator;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- public class Provider {
- // start provider
- static{
- PropertyConfigurator.configure("src/main/resources/log4.properties");
- }
- public static void main(String args[]) throws Exception {
- ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath*:/*.xml");
- context.start();
- System.in.read();
- }
- }



第四步:創建消費者,這里創建2個Spring mvc web項目來充當消費的角色。
2個消費者(dubbo-consumer01,dubbo-consumer02)也一樣,基本一樣,就是服務實現不一樣來測試負載均衡,還有個消費者配置文件不一樣。

4.1 2個消費者POM.xml基本是一樣的,標准的Spring mvc web項目,需要引入dubbo,zookeeper,公有服務service,Spring mvc系列,log4系列。這里需要注意的是,dubbo的Spring實在過於老舊了,對於web項目來說是不合適的,遇到了版本沖突,所以需要剔除dubbo中依賴的spring2.5
- <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
- <modelVersion>4.0.0</modelVersion>
- <groupId>com.test</groupId>
- <artifactId>dubbo-consumer02</artifactId>
- <packaging>war</packaging>
- <version>0.0.1-SNAPSHOT</version>
- <name>customer02 Maven Webapp</name>
- <url>http://maven.apache.org</url>
- <properties>
- <spring.version>4.3.8.RELEASE</spring.version>
- </properties>
- <dependencies>
- <dependency>
- <groupId>junit</groupId>
- <artifactId>junit</artifactId>
- <version>3.8.1</version>
- <scope>test</scope>
- </dependency>
- <dependency>
- <groupId>com.test</groupId>
- <artifactId>service</artifactId>
- <version>0.0.1-SNAPSHOT</version>
- </dependency>
- <dependency>
- <groupId>com.alibaba</groupId>
- <artifactId>dubbo</artifactId>
- <version>2.5.3</version>
- <exclusions>
- <exclusion>
- <artifactId>spring</artifactId>
- <groupId>org.springframework</groupId>
- </exclusion>
- </exclusions>
- </dependency>
- <!-- spring begin -->
- <dependency>
- <groupId>org.springframework</groupId>
- <artifactId>spring-webmvc</artifactId>
- <version>${spring.version}</version>
- </dependency>
- <dependency>
- <groupId>org.springframework</groupId>
- <artifactId>spring-jdbc</artifactId>
- <version>${spring.version}</version>
- </dependency>
- <dependency>
- <groupId>org.springframework</groupId>
- <artifactId>spring-context</artifactId>
- <version>${spring.version}</version>
- </dependency>
- <dependency>
- <groupId>org.springframework</groupId>
- <artifactId>spring-aop</artifactId>
- <version>${spring.version}</version>
- </dependency>
- <dependency>
- <groupId>org.springframework</groupId>
- <artifactId>spring-core</artifactId>
- <version>${spring.version}</version>
- </dependency>
- <dependency>
- <groupId>org.springframework</groupId>
- <artifactId>spring-test</artifactId>
- <version>${spring.version}</version>
- </dependency>
- <dependency>
- <groupId>org.springframework</groupId>
- <artifactId>spring-test</artifactId>
- <version>${spring.version}</version>
- </dependency>
- <!-- spring end -->
- <!-- web jar -->
- <dependency>
- <groupId>javax.servlet</groupId>
- <artifactId>javax.servlet-api</artifactId>
- <version>3.0.1</version>
- <scope>provided</scope>
- </dependency>
- <dependency>
- <groupId>javax.servlet</groupId>
- <artifactId>jstl</artifactId>
- <version>1.1.2</version>
- <scope>provided</scope>
- </dependency>
- <dependency>
- <groupId>javax.servlet.jsp</groupId>
- <artifactId>javax.servlet.jsp-api</artifactId>
- <version>2.3.1</version>
- <scope>provided</scope>
- </dependency>
- <!-- jstl jar -->
- <dependency>
- <groupId>jstl</groupId>
- <artifactId>jstl</artifactId>
- <version>1.2</version>
- </dependency>
- <dependency>
- <groupId>taglibs</groupId>
- <artifactId>standard</artifactId>
- <version>1.1.2</version>
- </dependency>
- <!-- jackson jar -->
- <dependency>
- <groupId>org.codehaus.jackson</groupId>
- <artifactId>jackson-jaxrs</artifactId>
- <version>1.9.11</version>
- </dependency>
- <!-- commons jar -->
- <dependency>
- <groupId>org.apache.commons</groupId>
- <artifactId>commons-lang3</artifactId>
- <version>3.3.2</version>
- </dependency>
- <dependency>
- <groupId>commons-io</groupId>
- <artifactId>commons-io</artifactId>
- <version>2.4</version>
- </dependency>
- <dependency>
- <groupId>org.apache.commons</groupId>
- <artifactId>commons-collections4</artifactId>
- <version>4.0</version>
- </dependency>
- <dependency>
- <groupId>commons-logging</groupId>
- <artifactId>commons-logging</artifactId>
- <version>1.1.3</version>
- </dependency>
- <dependency>
- <groupId>commons-codec</groupId>
- <artifactId>commons-codec</artifactId>
- <version>1.8</version>
- </dependency>
- <dependency>
- <groupId>commons-beanutils</groupId>
- <artifactId>commons-beanutils</artifactId>
- <version>1.8.3</version>
- </dependency>
- <dependency>
- <groupId>commons-chain</groupId>
- <artifactId>commons-chain</artifactId>
- <version>1.2</version>
- </dependency>
- <dependency>
- <groupId>commons-fileupload</groupId>
- <artifactId>commons-fileupload</artifactId>
- <version>1.3.1</version>
- </dependency>
- <dependency>
- <groupId>org.apache.commons</groupId>
- <artifactId>commons-math3</artifactId>
- <version>3.3</version>
- </dependency>
- <dependency>
- <groupId>org.apache.commons</groupId>
- <artifactId>commons-pool2</artifactId>
- <version>2.2</version>
- </dependency>
- <dependency>
- <groupId>org.apache.commons</groupId>
- <artifactId>commons-digester3</artifactId>
- <version>3.2</version>
- </dependency>
- <dependency>
- <groupId>commons-net</groupId>
- <artifactId>commons-net</artifactId>
- <version>3.3</version>
- </dependency>
- <dependency>
- <groupId>commons-dbutils</groupId>
- <artifactId>commons-dbutils</artifactId>
- <version>1.5</version>
- </dependency>
- <dependency>
- <groupId>org.apache.commons</groupId>
- <artifactId>commons-email</artifactId>
- <version>1.3.3</version>
- </dependency>
- <dependency>
- <groupId>commons-dbcp</groupId>
- <artifactId>commons-dbcp</artifactId>
- <version>1.4</version>
- </dependency>
- <!-- 日志相關 -->
- <dependency>
- <groupId>log4j</groupId>
- <artifactId>log4j</artifactId>
- <version>1.2.16</version>
- </dependency>
- <dependency>
- <groupId>org.slf4j</groupId>
- <artifactId>slf4j-api</artifactId>
- <version>1.7.5</version>
- </dependency>
- <!-- zookeeper client依賴,用於向zookeeper注冊服務 -->
- <dependency>
- <groupId>com.github.sgroschupf</groupId>
- <artifactId>zkclient</artifactId>
- <version>0.1</version>
- </dependency>
- </dependencies>
- <build>
- <finalName>dubbo-customer02</finalName>
- </build>
- </project>
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
- http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
- <display-name>Archetype Created Web Application</display-name>
- <!-- 關鍵配置 contextListener -->
- <context-param>
- <param-name>contextConfigLocation</param-name>
- <param-value>classpath*:applicationContext.xml</param-value>
- </context-param>
- <listener>
- <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
- </listener>
- <!-- log4 -->
- <context-param>
- <param-name>log4jConfigLocation</param-name>
- <param-value>classpath:log4.properties</param-value>
- </context-param>
- <context-param>
- <param-name>log4jRefreshInterval</param-name>
- <param-value>3000</param-value>
- </context-param>
- <listener>
- <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
- </listener>
- <!-- 字符過濾器 -->
- <filter>
- <filter-name>encodingFilter</filter-name>
- <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
- <init-param>
- <param-name>encoding</param-name>
- <param-value>UTF-8</param-value>
- </init-param>
- </filter>
- <filter-mapping>
- <filter-name>encodingFilter</filter-name>
- <url-pattern>/</url-pattern>
- </filter-mapping>
- <!-- 設置tomcat對靜態資源默認攔截 -->
- <servlet-mapping>
- <servlet-name>default</servlet-name>
- <url-pattern>*.jpg</url-pattern>
- </servlet-mapping>
- <servlet-mapping>
- <servlet-name>default</servlet-name>
- <url-pattern>*.png</url-pattern>
- </servlet-mapping>
- <servlet-mapping>
- <servlet-name>default</servlet-name>
- <url-pattern>*.js</url-pattern>
- </servlet-mapping>
- <servlet-mapping>
- <servlet-name>default</servlet-name>
- <url-pattern>*.css</url-pattern>
- </servlet-mapping>
- <!-- 關鍵配置 dispatcherServlet -->
- <!-- 攔截所有的請求,包括靜態資源 -->
- <servlet>
- <servlet-name>springmvc</servlet-name>
- <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
- <init-param>
- <param-name>contextConfigLocation</param-name>
- <param-value>classpath*:springmvc-servlet.xml</param-value>
- </init-param>
- <load-on-startup>1</load-on-startup>
- </servlet>
- <servlet-mapping>
- <servlet-name>springmvc</servlet-name>
- <url-pattern>/</url-pattern>
- </servlet-mapping>
- <welcome-file-list>
- <welcome-file>index.jsp</welcome-file>
- </welcome-file-list>
- </web-app>
- <?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"
- xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop"
- xmlns:tx="http://www.springframework.org/schema/tx"
- xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
- http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
- http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
- http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
- <import resource="classpath*:/consumer.xml" />
- </beans>
- <?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">
- <!-- 消費方應用名,用於計算依賴關系,不是匹配條件,不要與提供方一樣 -->
- <dubbo:application name="consumer01" />
- <!-- 使用zookeeper廣播注冊中心暴露服務地址 -->
- <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
- <!-- 生成遠程服務代理,可以和本地bean一樣使用demoService -->
- <dubbo:reference id="testService" interface="com.test.service.TestService" />
- </beans>
- <?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">
- <!-- 消費方應用名,用於計算依賴關系,不是匹配條件,不要與提供方一樣 -->
- <dubbo:application name="consumer02" />
- <!-- 使用zookeeper廣播注冊中心暴露服務地址 -->
- <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
- <!-- 生成遠程服務代理,可以和本地bean一樣使用demoService -->
- <dubbo:reference id="testService" interface="com.test.service.TestService" />
- </beans>
log4配置文件,沒什么好說的,同provider,這里不粘了
- <?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:context="http://www.springframework.org/schema/context"
- xmlns:mvc="http://www.springframework.org/schema/mvc"
- xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
- http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
- http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd"
- default-lazy-init="true">
- <!-- 啟用注解 -->
- <context:annotation-config />
- <!-- 掃描Controller -->
- <context:component-scan base-package="com.test.controller" />
- <!-- 完成請求與注解的POJO映射 -->
- <bean
- class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
- <bean
- class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
- <bean id="defaultViewResolver"
- class="org.springframework.web.servlet.view.InternalResourceViewResolver"
- p:order="3">
- <property name="viewClass"
- value="org.springframework.web.servlet.view.JstlView" />
- <property name="contentType" value="text/html" />
- <property name="prefix" value="/" />
- <property name="suffix" value=".jsp" />
- </bean>
- </beans>
- package com.test.controller;
- import java.util.Map;
- import javax.annotation.Resource;
- import org.springframework.stereotype.Controller;
- import org.springframework.web.bind.annotation.RequestMapping;
- import org.springframework.web.bind.annotation.ResponseBody;
- import com.test.service.TestService;
- /**
- * @author xianghui1
- *
- * 測試controller
- */
- @Controller
- public class TestController {
- @Resource(name = "testService")
- TestService testInterface;
- @RequestMapping(value = { "/consumer/testMain" })
- @ResponseBody
- public String testDubbo() {
- return "consuemr01" + testInterface.test();
- }
- }
- package com.test.controller;
- import java.util.Map;
- import javax.annotation.Resource;
- import org.springframework.stereotype.Controller;
- import org.springframework.web.bind.annotation.RequestMapping;
- import org.springframework.web.bind.annotation.ResponseBody;
- import com.test.service.TestService;
- /**
- * @author xianghui1
- *
- *測試controller
- */
- @Controller
- public class TestController {
- @Resource(name="testService")
- TestService testInterface;
- @RequestMapping(value={"/consumer/testMain"})
- @ResponseBody
- public String testDubbo(){
- return "consuemr02"+testInterface.test();
- }
- }


第五步:到這里我們的dubbo+zookeeper+Spring mvc 搭建完成了,下一步,加入nginx 實現http層面的負載均衡

--------------------------------------分割線 --------------------------------------
Ubuntu 14.04安裝分布式存儲Sheepdog+ZooKeeper http://www.linuxidc.com/Linux/2014-12/110352.htm
CentOS 6安裝sheepdog虛擬機分布式儲存 http://www.linuxidc.com/Linux/2013-08/89109.htm
ZooKeeper集群配置 http://www.linuxidc.com/Linux/2013-06/86348.htm
使用ZooKeeper實現分布式共享鎖http://www.linuxidc.com/Linux/2013-06/85550.htm
分布式服務框架 ZooKeeper -- 管理分布式環境中的數據http://www.linuxidc.com/Linux/2013-06/85549.htm
ZooKeeper集群環境搭建實踐 http://www.linuxidc.com/Linux/2013-04/83562.htm
ZooKeeper服務器集群環境配置實測 http://www.linuxidc.com/Linux/2013-04/83559.htm
ZooKeeper集群安裝 http://www.linuxidc.com/Linux/2012-10/72906.htm