Activemq-.xml
1.加载properties配置参数。下面加载是访问broker的身份信息，即用户名和密码

    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"><property name="locations"><value>file:${activemq.conf}/credentials.properties</value></property></bean>

2.配置broker.同时brokerName必须唯一

<broker xmlns="http://activemq.apache.org/schema/core"  brokerName="amq-broker" useJmx="true">

3.destination(即queue/topic)的策略
<destinationPolicy></destinationPolicy>

4.限制所有的queue和topic的内存大小；是否开启生产者的流程控制。

<policyEntry queue=">" producerFlowControl="true" memoryLimit="5mb"/>
<policyEntry topic=">" producerFlowControl="true" memoryLimit="5mb">

5.topic类型的分发策略。即一个topic生产的主题，严格按照产生的顺序被消费者接收。并且每个消费者接收的顺序都一样。

<dispatchPolicy><strictOrderDispatchPolicy/>
</dispatchPolicy>

strictOrderDispatchPolicy:严格按照产生的顺序被消费；
simpleDispatchPolicy:
roundRobinDispatchPolicy:
priorityNetworkDispatchPolicy:
priorityDispatchPolicy:

6.topic订阅发现的策略。

 <subscriptionRecoveryPolicy><lastImageSubscriptionRecoveryPolicy/></subscriptionRecoveryPolicy>

7.是否暴露JMX接口。

 <managementContext><managementContext createConnector="false"/></managementContext>

8.broker集群

<networkConnectors><networkConnector uri="static:(tcp://localhost:61616)" duplex="true"/>
</networkConnectors>

9.broker中的消息存储方式

 <persistenceAdapter><kahaDB directory="${activemq.data}/static-broker2/kahadb" /></persistenceAdapter>

10.activeMQ对服务器的资源分配

   <systemUsage><systemUsage><memoryUsage><memoryUsage limit="20 mb"/></memoryUsage><storeUsage><storeUsage limit="1 gb" name="foo"/></storeUsage><tempUsage><tempUsage limit="100 mb"/></tempUsage></systemUsage></systemUsage>

11.本activeMQ服务对外的协议以及端口

  <transportConnectors><transportConnector name="openwire" uri="tcp://localhost:61616" discoveryUri="multicast://default"/><transportConnector name="ssl" uri="ssl://localhost:61617"/><transportConnector name="stomp" uri="stomp://localhost:61613"/><transportConnector name="ws" uri="ws://localhost:61614/" /></transportConnectors>

12.ssl访问上下文

 <sslContext><sslContext keyStore="file:${activemq.conf}/broker.ks"keyStorePassword="password" trustStore="file:${activemq.conf}/broker.ts"trustStorePassword="password"/></sslContext>

13.activeMQ关闭时习销毁spring context

 <shutdownHooks><bean xmlns="http://www.springframework.org/schema/beans" class="org.apache.activemq.hooks.SpringContextHook" /></shutdownHooks>

14.安全身份设置

    <plugins><simpleAuthenticationPlugin><users><authenticationUser username="system" password="${activemq.password}"groups="users,admins"/><authenticationUser username="user" password="${guest.password}"groups="users"/><authenticationUser username="guest" password="${guest.password}" groups="guests"/></users></simpleAuthenticationPlugin><authorizationPlugin><map><authorizationMap><authorizationEntries><authorizationEntry queue=">" read="admins" write="admins" admin="admins" /><authorizationEntry queue="USERS.>" read="users" write="users" admin="users" /><authorizationEntry queue="GUEST.>" read="guests" write="guests,users" admin="guests,users" /><authorizationEntry queue="TEST.Q" read="guests" write="guests" /><authorizationEntry topic=">" read="admins" write="admins" admin="admins" /><authorizationEntry topic="USERS.>" read="users" write="users" admin="users" /><authorizationEntry topic="GUEST.>" read="guests" write="guests,users" admin="guests,users" /><authorizationEntry topic="ActiveMQ.Advisory.>" read="guests,users" write="guests,users" admin="guests,users"/></authorizationEntries></authorizationMap></map></authorizationPlugin></plugins>