JBoss AS的调优与瘦身(二)-阿里云开发者社区

瘦身

当不使用mail-service服务的时候 (J2EE 标准的 JavaMail 客户端)

l 移除server/slim/deploy/mail-service.xml

l 移除server/slim/lib/mail* (mail-plugin.jar, mail.jar - JavaMail stuff)

l 移除server/slim/lib/activation.jar (JavaMail使用的Java 活动框架【Java Activation Framework】)

当不使用缓存失效服务的时候 (一般在集群配置里作为CMP选择一个beans用与失效缓存)

l 移除 server/slim/deloy/cache-invalidation-service.xml

当不使用J2EE客户端部署服务的时候(这不是一个很有益的J2EE规格必须服务，对于EAR application-client.xml描述符)

l 移除 server/slim/deploy/client-deployer-service.xml

当不使用集成HAR部署和Hibernate会话管理服务的时候

l 移除server/slim/deploy/hibernate-deployer-service.xml (HAR support)

l 移除server/slim/lib/jboss-hibernate.jar (HAR support)

l 移除server/slim/lib/hibernate2.jar (Hibernate itself)

l 移除server/slim/lib/cglib-full-2.0.1.jar (used by Hibernate to create proxies of POJOs)

l 移除server/slim/lib/odmg-3.0.jar (由hibernate使用的一些傻瓜试的对象－关系映射行为是从一些傻瓜式的委员会来的[goofy committee][url]http://www.service-architecture.com/database/articles/odmg_3_0.html[/url] )

不使用 Hypersonic的时候 (在生产环境里你可能不使用这个)

注意在默认配置里 JBossMQ使用 DefaultDS名字同样被部署，用于为Hypersonic映射. 在配置上对于其他选择的更多信息，见 JBoss MQ Persistence Wiki pages .

l 移除server/slim/deploy/hsqldb-ds.xml

l 移除server/slim/lib/hsqldb-plugin.jar

l 移除server/slim/lib/hsqldb.jar

不使用 JBossMQ 的时候(我们的 JMS 服务器)

l 移除the entire server/slim/deploy/jms directory

l 移除server/slim/lib/jbossmq.jar

不使用 HTTPInvoker的时候 (从RMI到HTTP的隧道)

l 移除the entire server/slim/deploy/http-invoker.sar 文件夹

不使用 XA 数据源的使用 (分布式 and/or 可恢复的事务)

l 移除server/slim/deploy/jboss-xa-jdbc.rar

如果你不需要JMX-Console 然后删除它

l 移除server/slim/deploy/jmx-console.war

l 使用别的方法使它安全

如果你不需要制造JMX调用RMI (警告the shutdown.sh 是否这样做)

l 移除server/slim/deploy/jmx-invoker-adaptor-server.sar

l 移除server/slim/deploy/jmx-adaptor-plugin.jar

l 或者你可能想正好想用安全的 the JMX invoker-adaptor顶替

如果你不需要web-console

l 移除server/slim/deploy/management/web-console.war

如果你不需要JMX的JSR-77扩充

l 移除server/slim/deploy/management/console-mgr.sar

如果你需要web-console 或者 jsr-77 扩充的其中之一

l 移除server/slim/deploy/management directory entirely

如果你不使用控制台/email监控警报

l 移除server/slim/deploy/monitoring-service.xml

l 移除server/slim/lib/jboss-monitoring.jar

如果你不通过Properties Service使用富资源编辑器(JMX)或者装载properties到系统properties 里。

l 移除server/slim/deploy/properties-service.xml

l 移除server/slim/lib/properties-plugin.jar

此scheduler-service.xml是一个例子，除非你在它的里面放入自己的东西

l 移除server/slim/deploy/scheduler-service.xml

如果你不适用JBoss调度管理 (允许你安排请求依赖MBeans)

l 移除server/slim/deploy/schedule-manager-service.xml

l 移除server/slim/lib/scheduler-plugin* (scheduler-plugin.jar, scheduler-plugin-example.jar)

如果你不需要供应商特定的sql异常援助[handing] (just leave it, really)

l 移除server/slim/deploy/sqlexception-service.xml

如果你既没有使用客户端事务管理，也没有缓存连接(我们缓存连接来代替池，例如就JAAS->DB User 来说—－使用这个意味着你是个坏人，需要被拍击[using this means you are a bad person and need to be smacked]) .

l 移除server/slim/deploy/user-service.xml

如果你不使用JBoss的UUID key生成 (大多情况下用于CMP主键生成，但是我们的数据库也同样支持的很好)

l 移除server/slim/deploy/uuid-key-generator.sar

l 移除server/slim/lib/autonumber-plugin.jar

user-service.xml 是一个例子 – 除非你在它里面做一些事情 (你自己的mbeans)，你可以移除它.

l 移除server/slim/deploy/user-service.xml

如果你使用通过HTTP直接连接Tomcat而不是通过Apache/mod_jk:

l 使用vi编辑器打开server/slim/deploy/jbossweb-tomcat50.sar/server.xml

l 移除/注释下面的XML 片段:

< Connector port ="8009" address ="${jboss.bind.address}"
enableLookups ="false" redirectPort ="8443" debug ="0"
protocol ="AJP/1.3" />

如果你的用户总是不通过HTTP连接到Tomcat而总是通过Apache/mod_jk连接

l 使用vi编辑server/slim/deploy/jbossweb-tomcat50.sar/server.xml 文件

l 移除/注释下面的XML片段:

< Connector port ="8080" address ="${jboss.bind.address}"
maxThreads ="150" minSpareThreads ="25" maxSpareThreads ="75"
enableLookups ="false" redirectPort ="8443" acceptCount ="100"
connectionTimeout ="20000" disableUploadTimeout ="true" />

如果你不需要可以部署EAR文件

l 使用vi打开编辑 server/slim/conf/jboss-service.xml文件

l 移除/注释下面的XML片段从这

从这个

< mbean code ="org.jboss.management.j2ee.LocalJBossServerDomain" >

MBean 下面

< attribute name ="EARDeployer" >jboss.j2ee:service=EARDeployer </ attribute >

和

< mbean code ="org.jboss.deployment.EARDeployer"name="jboss.j2ee:service=EARDeployer" >
</ mbean >

如果你不需要可以部署JMS队列

l 使用vi打开 server/slim/conf/jboss-service.xml 文件

l 移除/注释下面的XML片段从这

从这个

< mbean code ="org.jboss.management.j2ee.LocalJBossServerDomain" >

Mbean下面

< attribute name ="JMSService" >jboss.mq:service=DestinationManager </ attribute >

如果你不需要使用CORBA/IIOP

l 使用vi打开编辑 server/slim/conf/jboss-service.xml文件

l 移除/注释下面的XML片段从这

从这个

< mbean code ="org.jboss.management.j2ee.LocalJBossServerDomain" >

MBean 下面

< attribute name ="RMI_IIOPService" >jboss:service=CorbaORB </ attribute >

如果你删除user-transaction-service.xml

l Vi编辑 server/slim/conf/jboss-service.xml 文件

l 移除/注释下面的XML片段从这

从这个

< mbean code ="org.jboss.management.j2ee.LocalJBossServerDomain" >

MBean 下面

< attribute name ="UserTransactionService" >jboss:service=ClientUserTransaction </ attribute >

如果你不需要JSR-77支持 (尝试做JBoss, Weblogic 和 Websphere支持一些基于同类的JMX监控)你可以删除/注释server/slim/conf/jboss-service.xml文件关于JSR-77的全部片段:

< mbean code ="org.jboss.management.j2ee.LocalJBossServerDomain"
name ="jboss.management.local:j2eeType=J2EEDomain,name=Manager" >
< attribute name ="MainDeployer" >jboss.system:service=MainDeployer </ attribute >
< attribute name ="SARDeployer" >jboss.system:service=ServiceDeployer </ attribute >

< attribute name ="EJBDeployer" >jboss.ejb:service=EJBDeployer </ attribute >
< attribute name ="RARDeployer" >jboss.jca:service=RARDeployer </ attribute >
< attribute name ="CMDeployer" >jboss.jca:service=ConnectionFactoryDeployer </ attribute >
< attribute name ="WARDeployer" >jboss.web:service=WebServer </ attribute >
< attribute name ="MailService" >jboss:service=Mail </ attribute >

< attribute name ="JNDIService" >jboss:service=Naming </ attribute >
< attribute name ="JTAService" >jboss:service=TransactionManager </ attribute >

</ mbean >

如果你不需要client-side事务管理 (记住，使用这个那意味着你是一个坏人)

l 使用vi编辑 server/slim/conf/jboss-service.xml文件

l 移除/注释下面的XML片段

< mbean code ="org.jboss.tm.usertx.server.ClientUserTransactionService"
name ="jboss:service=ClientUserTransaction"
xmbean-dd ="resource:xmdesc/ClientUserTransaction-xmbean.xml" >
< depends >
< mbean code ="org.jboss.invocation.jrmp.server.JRMPProxyFactory"
name ="jboss:service=proxyFactory,target=ClientUserTransactionFactory" >
< attribute name ="InvokerName" >jboss:service=invoker,type=jrmp </ attribute >
< attribute name ="TargetName" >jboss:service=ClientUserTransaction </ attribute >
< attribute name ="JndiName" >UserTransactionSessionFactory </ attribute >
< attribute name ="ExportedInterface" >
org.jboss.tm.usertx.interfaces.UserTransactionSessionFactory
</ attribute >
< attribute name ="ClientInterceptors" >
< interceptors >
< interceptor >org.jboss.proxy.ClientMethodInterceptor </ interceptor >
< interceptor >org.jboss.invocation.InvokerInterceptor </ interceptor >
</ interceptors >
</ attribute >
< depends >jboss:service=invoker,type=jrmp </ depends >
</ mbean >
</ depends >
< depends optional-attribute-name ="TxProxyName" >
< mbean code ="org.jboss.invocation.jrmp.server.JRMPProxyFactory"
name ="jboss:service=proxyFactory,target=ClientUserTransaction" >
< attribute name ="InvokerName" >jboss:service=invoker,type=jrmp </ attribute >
< attribute name ="TargetName" >jboss:service=ClientUserTransaction </ attribute >
< attribute name ="JndiName" > </ attribute >
< attribute name ="ExportedInterface" > org.jboss.tm.usertx.interfaces.UserTransactionSession
</ attribute >
< attribute name ="ClientInterceptors" >
< interceptors >
< interceptor >org.jboss.proxy.ClientMethodInterceptor </ interceptor >
< interceptor >org.jboss.invocation.InvokerInterceptor </ interceptor >
</ interceptors >
</ attribute >
< depends >jboss:service=invoker,type=jrmp </ depends >
</ mbean >
</ depends >
</ mbean >

l 你现在能删除从来没有引用的server/slim/conf/xmdesc/ClientUserTransaction-xmbean.xml 文件

如果你不需要持久化MBean（persistent MBean ）特性 (默认情况下，没有JBoss MBeans使用它...yet)

l 编辑 server/slim/conf/jboss-service.xml文件

l 移除/注释这个XML片段

< mbean code ="org.jboss.system.pm.AttributePersistenceService"
name ="jboss:service=AttributePersistenceService"
xmbean-dd ="resource:xmdesc/AttributePersistenceService-xmbean.xml" >
< attribute name ="AttributePersistenceManagerClass" >  org.jboss.system.pm.XMLAttributePersistenceManager
</ attribute >
< attribute name ="AttributePersistenceManagerConfig" >
< data-directory >data/xmbean-attrs </ data-directory >
</ attribute >
< attribute name ="ApmDestroyOnServiceStop" >false </ attribute >
< attribute name ="VersionTag" > </ attribute >
</ mbean >

l 既然server/slim/conf/xmdec/xmdesc/AttributePersistenceService-xmbean.xml已经不在被引用，你也可以删除它。

如果你不使用RMI类装载器 (在服务器上利用classes从客户端装载代码)

l vi编辑 server/slim/conf/jboss-service.xml文件

l 移除/注释这个XML片段

< mbean code ="org.jboss.util.property.jmx.SystemPropertyClassValue"
name ="jboss.rmi:type=RMIClassLoader" >
< attribute name ="Property" >java.rmi.server.RMIClassLoaderSpi </ attribute >
< attribute name ="ClassName" >org.jboss.system.JBossRMIClassLoader </ attribute >
</ mbean >

和

< mbean code ="org.jboss.web.WebService"
name ="jboss:service=WebService" >
< attribute name ="Port" >8083 </ attribute >

< attribute name ="DownloadServerClasses" >true </ attribute >
< attribute name ="Host" >${jboss.bind.address} </ attribute >
< attribute name ="BindAddress" >${jboss.bind.address} </ attribute >
</ mbean >

l 修改XML片段 (注意: 在JBoss 4.0里,是在server/slim/deploy/ejb-deployer.xml文件里的一点设置):

< mbean code ="org.jboss.ejb.EJBDeployer" name ="jboss.ejb:service=EJBDeployer" >
< attribute name ="VerifyDeployments" >true </ attribute >

...

< depends optional-attribute-name ="WebServiceName" >jboss:service=WebService </ depends >
</ mbean >

象这样标明:

< mbean code ="org.jboss.ejb.EJBDeployer" name ="jboss.ejb:service=EJBDeployer" >
< attribute name ="VerifyDeployments" >true </ attribute >

...


</ mbean >

或者选择性的移除WebServiceName? depends/attribute.

如果你只想使用 JBoss Naming locally (没有 RMI 客户端)

l 用vi打开 server/slim/conf/jboss-service.xml文件

l 更改下面的XML片段

< mbean code ="org.jboss.naming.NamingService"
name ="jboss:service=Naming"
xmbean-dd ="resource:xmdesc/NamingService-xmbean.xml" >

...


< attribute name ="Port" >1099 </ attribute >

...


< attribute name ="RmiPort" >1098 </ attribute >

...

</ mbean >

改写

< mbean code ="org.jboss.naming.NamingService"
name ="jboss:service=Naming"
xmbean-dd ="resource:xmdesc/NamingService-xmbean.xml" >

...


< attribute name ="Port" >-1 </ attribute >

...


< attribute name ="RmiPort" >0 </ attribute >

...

</ mbean >

该RmiPort 大多是可选的，但是它意味着我们将不绑定到1098端口，以便这是有益的.

你也可以从相同的XML区域删除此行，来删除相关联的线程池:

< depends optional-attribute-name ="LookupPool"
proxy-type ="attribute" >jboss.system:service=ThreadPool </ depends >

和它自己的线程池块:

< mbean code ="org.jboss.util.threadpool.BasicThreadPool"
name ="jboss.system:service=ThreadPool" >
< attribute name ="Name" >JBoss System Threads </ attribute >
< attribute name ="ThreadGroupName" >System Threads </ attribute >
< attribute name ="KeepAliveTime" >60000 </ attribute >
< attribute name ="MinimumPoolSize" >1 </ attribute >
< attribute name ="MaximumPoolSize" >10 </ attribute >
< attribute name ="MaximumQueueSize" >1000 </ attribute >
< attribute name ="BlockingMode" >run </ attribute >
</ mbean >

如果你使用它，从JMX控制台(显示JNDI命名树) 此JNDIView MBean 是非常有用的, 除非你不使用它。

l 使用vi打开 server/slim/conf/jboss-service.xml

l 删除

< mbean code ="org.jboss.naming.JNDIView"
name ="jboss:service=JNDIView"
xmbean-dd ="resource:xmdesc/JNDIView-xmbean.xml" >
</ mbean >

l 你可以也删掉server/slim/conf/xmdesc/JNDIView-xmbean.xml 文件

如果你不使用JBossSX, 我们为EJBs或者Web层组件继承的基于JAAS的安全 (then you deserve to be flogged and I hope you get hacked but thats another story):

l 使用vi打开 server/slim/conf/jboss-service.xml

l 删除

<!--
< mbean code ="org.jboss.security.plugins.SecurityConfig"
name ="jboss.security:service=SecurityConfig" >
< attribute name ="LoginConfig" >jboss.security:service=XMLLoginConfig </ attribute >
</ mbean >
< mbean code ="org.jboss.security.auth.login.XMLLoginConfig"
name ="jboss.security:service=XMLLoginConfig" >
< attribute name ="ConfigResource" >login-config.xml </ attribute >
</ mbean >

l 编辑 server/slim/deploy/jbossweb-tomcatxx.sar/META-INF/jboss-service.xml 并注释掉这些片段:

和

<!—
< depends optional-attribute-name ="SecurityManagerService"
proxy-type ="attribute" >jboss.security:service=JaasSecurityManager
</ depends >
-->

l 也移除/注释:

< mbean code ="org.jboss.security.plugins.JaasSecurityManagerService"
name ="jboss.security:service=JaasSecurityManager" >
< attribute name ="SecurityManagerClassName" >
org.jboss.security.plugins.JaasSecurityManager
</ attribute >
< attribute name ="DefaultCacheTimeout" >1800 </ attribute >
< attribute name ="DefaultCacheResolution" >60 </ attribute >
</ mbean >

l 如果你使用JBossMQ，你将需要从server/slim/deploy/jms/jbossmq-destinations-service.xml文件的所有测试 queues/topics中删掉任何一个 (优先的)或者注释掉他们的安全性信息. 如果你选择保持示例topics/queues增加如下注释:

< mbean code ="org.jboss.mq.server.jmx.Topic"
name ="jboss.mq.destination:service=Topic,name=testTopic" >
< depends optional-attribute-name ="DestinationManager" >jboss.mq:service=DestinationManager </ depends >
<!—-
< depends optional-attribute-name ="SecurityManager" >
jboss.mq:service=SecurityManager </ depends >
< attribute name ="SecurityConf" >
< security >
< role name ="guest" read ="true" write ="true" />
< role name ="publisher" read ="true" write ="true" create ="false" />
< role name ="durpublisher" read ="true" write ="true" create ="true" />
</ security >
</ attribute >
-->
</ mbean >
< mbean code ="org.jboss.mq.server.jmx.Topic"
name ="jboss.mq.destination:service=Topic,name=testTopic" >
< depends optional-attribute-name ="DestinationManager" >jboss.mq:service=DestinationManager </ depends >

</ mbean >
< mbean code ="org.jboss.mq.server.jmx.Topic"
name ="jboss.mq.destination:service=Topic,name=testDurableTopic" >
< depends optional-attribute-name ="DestinationManager" >jboss.mq:service=DestinationManager </ depends >

</ mbean >
< mbean code ="org.jboss.mq.server.jmx.Queue"

name ="jboss.mq.destination:service=Queue,name=testQueue" >

< depends optional-attribute-name ="DestinationManager" >jboss.mq:service=DestinationManager </ depends >


</ mbean >

l 如果使用JBossMQ ，你也需要编辑server/slim/deploy/jms/jbossmq-service.xml 和变更 InterceptorLoader? XML 片段，像下面这样:

< mbean code ="org.jboss.mq.server.jmx.InterceptorLoader" name ="jboss.mq:service=TracingInterceptor" >
< attribute name ="InterceptorClass" >org.jboss.mq.server.TracingInterceptor </ attribute >
< depends optional-attribute-name ="NextInterceptor" >jboss.mq:service=DestinationManager </ depends >

</ mbean >

l 你也需要注释或者删除(从server/slim/deploy/jms/jbossmq-service.xml文件):

<!—
< mbean code ="org.jboss.mq.security.SecurityManager" name ="jboss.mq:service=SecurityManager" >
< attribute name ="DefaultSecurityConfig" >
< security >
< role name ="guest" read ="true" write ="true" create ="true" />
</ security >
</ attribute >
< attribute name ="SecurityDomain" >java:/jaas/jbossmq </ attribute >
< depends optional-attribute-name ="NextInterceptor" >jboss.mq:service=DestinationManager </ depends >
</ mbean >
-->

l 修改死亡信队列项(server/slim/deploy/jms/jbossmq-service.xml) 注释掉安全源:

<!—死亡信队列-->
< mbean code ="org.jboss.mq.server.jmx.Queue"
name ="jboss.mq.destination:service=Queue,name=DLQ" >
< depends optional-attribute-name ="DestinationManager" >jboss.mq:service=DestinationManager </ depends >

</ mbean >

l 在 server/slim/deploy/jms/jms-ds.xml文件中修改JmsXA 项如下:

< tx-connection-factory >
< jndi-name >JmsXA </ jndi-name >
< xa-transaction />
< adapter-display-name >JMS Adapter </ adapter-display-name >
< config-property name ="SessionDefaultType" type ="java.lang.String" >javax.jms.Topic </ config-property >
< config-property name ="JmsProviderAdapterJNDI" type ="java.lang.String" >java:/DefaultJMSProvider </ config-property >
< max-pool-size >20 </ max-pool-size >

</ tx-connection-factory >

l 如果使用JBoss 4, also do this 2 things:

l 在 conf/login-config.xml文件中, 注释下面的:

<!—测试jca框架的安全域
     < application-policy name = "HsqlDbRealm" >
        < authentication >
           < login-module code = "org.jboss.resource.security.ConfiguredIdentityLoginModule"
             flag = "required" >
              < module-option name = "principal" >sa </ module-option >
              < module-option name = "userName" >sa </ module-option >
              < module-option name = "password" > </ module-option >
              < module-option name = "managedConnectionFactoryName" >      jboss.jca:service=LocalTxCM,name=DefaultDS              </ module-option >
           </ login-module >
        </ authentication >
     </ application-policy >
     < application-policy name = "JmsXARealm" >
        < authentication >
           < login-module code = "org.jboss.resource.security.ConfiguredIdentityLoginModule"
             flag = "required" >
              < module-option name = "principal" >guest </ module-option >
              < module-option name = "userName" >guest </ module-option >
              < module-option name = "password" >guest </ module-option >
              < module-option name = "managedConnectionFactoryName" >            jboss.jca:service=TxCM,name=JmsXA
              </ module-option >
           </ login-module >
        </ authentication >
</ application-policy >
-->

l 和在deploy/hsqldb-ds.xml文件中注释:

如果你不使用池请求（Pooled Invoker）If you are not using the (见调优章节，也也许想使用池请求) 然后:

l 使用vi打开 server/slim/conf/jboss-service.xml 文件

l 删掉:

如果你不希望使用 BeanShell deployer

l 使用vi打开 server/slim/conf/jboss-service.xml 文件

l 删除或者注释

< mbean code ="org.jboss.varia.deployment.BeanShellSubDeployer"
name ="jboss.scripts:service=BSHDeployer" >
</ mbean >

l 删除 server/slim/bsh* (bsh-deployer.jar, bsh-1.3.0.jar)

如果你不使用热部署文件到server/slim/deploy 文件夹，而从外部重启JBoss:

l 使用vi打开 server/slim/conf/jboss-service.xml 文件

l 改变这个 XML的片段:

<!—热部署/反部署归档文件的mbean. -->
< mbean code ="org.jboss.deployment.scanner.URLDeploymentScanner"
name ="jboss.deployment:type=DeploymentScanner,flavor=URL" >

...

< attribute name ="ScanPeriod" >5000 </ attribute >

...

</ mbean >

改为(加入):

< mbean code ="org.jboss.deployment.scanner.URLDeploymentScanner"
name ="jboss.deployment:type=DeploymentScanner,flavor=URL" >

...

< attribute name ="ScanPeriod" >5000 </ attribute >

< attribute name ="ScanEnabled" >False </ attribute >

...

</ mbean >

l 就这个性能透视而言，看其他建议的调整章节

如果你不使用集群

l 最好的方法就是从"default"配置启动，而不是使用"all"配置启动. 然后从"all"配置里带来的一些各种服务，你在"default"配置里没有使用.

l 如果你必须从“all”配置启动:

o 移除 server/slim/farm

o 移除server/slim/deploy-hasingleton

o 移除server/slim/deploy/cluster-service.xml

o 移除server/slim/deploy/tc5-cluster-service.xml (或者在4.0.4或者以前的版本上的server/slim/deploy/tc5-cluster.sar)

o 移除server/slim/deploy/deploy.last/farm-service.xml

o 移除server/slim/deploy/deploy-hasingleton-service.xml

o 进入到 server/slim/deploy/jms 文件夹, 删除它的内容,并从server/default/deploy/jms文件夹复制他们到这里.

o 编辑 server/slim/deploy/jbossweb-tomcat55.sar/META-INF
/jboss-service.xml 移除下面的片段:

< depends >jboss.cache:service=TomcatClusteringCache </ depends >

如果你不使用分布式（集群）web会话（sessions）

l 移除 server/slim/deploy/tc5-cluster-service.xml (或者在4.0.4或者以前的版本上的server/slim/deploy/tc5-cluster.sar)

l 编辑 server/slim/deploy/jbossweb-tomcat55.sar/META-INF/jboss-service.xml 移除这个片段:

<depends>jboss.cache:service=TomcatClusteringCache</depends>

如果你不使用Farm服务 (复制部署)

l 移除server/slim/farm

l 移除server/slim/deploy/deploy.last/farm-service.xml

JBoss AS的调优与瘦身就翻译完了，翻译的不好，请谅解。还有就是这也只是看看，到底用途和状况怎么样，还需要具体的实践工作。

本文转自xudayu 51CTO博客，原文链接：http://blog.51cto.com/xudayu/77054，如需转载请自行联系原作者