SharedFile System Master Slave(共享文件系统)做ActiveMQ集群
WINDOWS环境下：http://www.apache.org/dyn/closer.cgi?path=/activemq/apache-activemq/5.9.0/apache-activemq-5.9.0-bin.zip下载apache-activemq-5.9.0-bin.tar，解压两次，分别命名为activemq1、activemq2，修改activemq1/conf/activemq.xml中<persistenceAdapter>标签下的<kahaDB>文件路径<directory>，修改为E:/activemq_data,详情如下：
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- START SNIPPET: example -->
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd">
<!-- Allows us to use system properties as variables in this configuration file -->
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<value>file:${activemq.conf}/credentials.properties</value>
</property>
</bean>
<!-- Allows log searching in hawtio console -->
<bean id="logQuery" class="org.fusesource.insight.log.log4j.Log4jLogQuery"
lazy-init="false" scope="singleton"
init-method="start" destroy-method="stop">
</bean>
<!--
The <broker> element is used to configure the ActiveMQ broker.
-->
<broker xmlns="http://activemq.apache.org/schema/core" brokerName="localhost" dataDirectory="${activemq.data}" useJmx="true">
<destinationPolicy>
<policyMap>
<policyEntries>
<policyEntry topic=">" producerFlowControl="false" memoryLimit="10mb">
<!-- The constantPendingMessageLimitStrategy is used to prevent
slow topic consumers to block producers and affect other consumers
by limiting the number of messages that are retained
For more information, see:
http://activemq.apache.org/slow-consumer-handling.html
-->
<!-- 分发策略 -->
<dispatchPolicy>
<!-- 按顺序分发 -->
<strictOrderDispatchPolicy/>
</dispatchPolicy>
<!-- 恢复策略-->
<subscriptionRecoveryPolicy>
<!-- 只恢复最后一个message -->
<lastImageSubscriptionRecoveryPolicy/>
</subscriptionRecoveryPolicy>
<pendingMessageLimitStrategy>
<constantPendingMessageLimitStrategy limit="1000"/>
</pendingMessageLimitStrategy>
</policyEntry>
</policyEntries>
</policyMap>
</destinationPolicy>
<!--
The managementContext is used to configure how ActiveMQ is exposed in
JMX. By default, ActiveMQ uses the MBean server that is started by
the JVM. For more information, see:
http://activemq.apache.org/jmx.html
-->
<managementContext>
<managementContext createConnector="false"/>
</managementContext>
<!--
Configure message persistence for the broker. The default persistence
mechanism is the KahaDB store (identified by the kahaDB tag).
For more information, see:
http://activemq.apache.org/persistence.html
-->
<persistenceAdapter>
<kahaDB directory="E:/activemq_data"
enableJournalDiskSyncs="false"
indexWriteBatchSize="10000"
indexCacheSize="1000"
journalMaxFileLength="32mb"
/>
</persistenceAdapter>
<!--
The systemUsage controls the maximum amount of space the broker will
use before disabling caching and/or slowing down producers. For more information, see:
http://activemq.apache.org/producer-flow-control.html
-->
<systemUsage>
<systemUsage>
<memoryUsage>
<memoryUsage percentOfJvmHeap="70" />
</memoryUsage>
<storeUsage>
<storeUsage limit="100 gb"/>
</storeUsage>
<tempUsage>
<tempUsage limit="50 gb"/>
</tempUsage>
</systemUsage>
</systemUsage>
<!--
The transport connectors expose ActiveMQ over a given protocol to
clients and other brokers. For more information, see:
http://activemq.apache.org/configuring-transports.html
-->
<transportConnectors>
<!-- DOS protection, limit concurrent connections to 1000 and frame size to 100MB -->
<transportConnector name="openwire" uri="tcp://0.0.0.0:61616?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="amqp" uri="amqp://0.0.0.0:5672?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="stomp" uri="stomp://0.0.0.0:61613?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="mqtt" uri="mqtt://0.0.0.0:1883?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="ws" uri="ws://0.0.0.0:61614?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
</transportConnectors>
<!-- destroy the spring context on shutdown to stop jetty -->
<shutdownHooks>
<bean xmlns="http://www.springframework.org/schema/beans" class="org.apache.activemq.hooks.SpringContextHook" />
</shutdownHooks>
</broker>
<!--
Enable web consoles, REST and Ajax APIs and demos
The web consoles requires by default login, you can disable this in the jetty.xml file
Take a look at ${ACTIVEMQ_HOME}/conf/jetty.xml for more details
-->
<import resource="jetty.xml"/>
</beans>
<!-- END SNIPPET: example -->
接下来修改activemq2/conf/activemq.xml中<persistenceAdapter>标签下的<kahaDB>文件路径<directory>，修改为E:/activemq_data,详情如下：
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- START SNIPPET: example -->
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd">
<!-- Allows us to use system properties as variables in this configuration file -->
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<value>file:${activemq.conf}/credentials.properties</value>
</property>
</bean>
<!-- Allows log searching in hawtio console -->
<bean id="logQuery" class="org.fusesource.insight.log.log4j.Log4jLogQuery"
lazy-init="false" scope="singleton"
init-method="start" destroy-method="stop">
</bean>
<!--
The <broker> element is used to configure the ActiveMQ broker.
-->
<broker xmlns="http://activemq.apache.org/schema/core" brokerName="localhost" dataDirectory="${activemq.data}" useJmx="true">
<destinationPolicy>
<policyMap>
<policyEntries>
<policyEntry topic=">" producerFlowControl="false" memoryLimit="10mb">
<!-- The constantPendingMessageLimitStrategy is used to prevent
slow topic consumers to block producers and affect other consumers
by limiting the number of messages that are retained
For more information, see:
http://activemq.apache.org/slow-consumer-handling.html
-->
<!-- 分发策略 -->
<dispatchPolicy>
<!-- 按顺序分发 -->
<strictOrderDispatchPolicy/>
</dispatchPolicy>
<!-- 恢复策略-->
<subscriptionRecoveryPolicy>
<!-- 只恢复最后一个message -->
<lastImageSubscriptionRecoveryPolicy/>
</subscriptionRecoveryPolicy>
<pendingMessageLimitStrategy>
<constantPendingMessageLimitStrategy limit="1000"/>
</pendingMessageLimitStrategy>
</policyEntry>
</policyEntries>
</policyMap>
</destinationPolicy>
<!--
The managementContext is used to configure how ActiveMQ is exposed in
JMX. By default, ActiveMQ uses the MBean server that is started by
the JVM. For more information, see:
http://activemq.apache.org/jmx.html
-->
<managementContext>
<managementContext createConnector="false"/>
</managementContext>
<!--
Configure message persistence for the broker. The default persistence
mechanism is the KahaDB store (identified by the kahaDB tag).
For more information, see:
http://activemq.apache.org/persistence.html
-->
<persistenceAdapter>
<kahaDB directory="E:/activemq_data"
enableJournalDiskSyncs="false"
indexWriteBatchSize="10000"
indexCacheSize="1000"
journalMaxFileLength="32mb"
/>
</persistenceAdapter>
<!--
The systemUsage controls the maximum amount of space the broker will
use before disabling caching and/or slowing down producers. For more information, see:
http://activemq.apache.org/producer-flow-control.html
-->
<systemUsage>
<systemUsage>
<memoryUsage>
<memoryUsage percentOfJvmHeap="70" />
</memoryUsage>
<storeUsage>
<storeUsage limit="100 gb"/>
</storeUsage>
<tempUsage>
<tempUsage limit="50 gb"/>
</tempUsage>
</systemUsage>
</systemUsage>
<!--
The transport connectors expose ActiveMQ over a given protocol to
clients and other brokers. For more information, see:
http://activemq.apache.org/configuring-transports.html
-->
<transportConnectors>
<!-- DOS protection, limit concurrent connections to 1000 and frame size to 100MB -->
<transportConnector name="openwire" uri="tcp://0.0.0.0:61617?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="amqp" uri="amqp://0.0.0.0:5672?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="stomp" uri="stomp://0.0.0.0:61613?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="mqtt" uri="mqtt://0.0.0.0:1883?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="ws" uri="ws://0.0.0.0:61614?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
</transportConnectors>
<!-- destroy the spring context on shutdown to stop jetty -->
<shutdownHooks>
<bean xmlns="http://www.springframework.org/schema/beans" class="org.apache.activemq.hooks.SpringContextHook" />
</shutdownHooks>
</broker>
<!--
Enable web consoles, REST and Ajax APIs and demos
The web consoles requires by default login, you can disable this in the jetty.xml file
Take a look at ${ACTIVEMQ_HOME}/conf/jetty.xml for more details
-->
<import resource="jetty.xml"/>
</beans>
<!-- END SNIPPET: example -->
修改activemq2/conf/jetty.xml中端口号port
详情如下：
<!--
Licensed to the Apache Software Foundation (ASF) under one or more contributor
license agreements. See the NOTICE file distributed with this work for additional
information regarding copyright ownership. The ASF licenses this file to You under
the Apache License, Version 2.0 (the "License"); you may not use this file except in
compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or
agreed to in writing, software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied. See the License for the specific language governing permissions and
limitations under the License.
-->
<!--
An embedded servlet engine for serving up the Admin consoles, REST and Ajax APIs and
some demos Include this file in your configuration to enable ActiveMQ web components
e.g. <import resource="jetty.xml"/>
-->
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="securityLoginService" class="org.eclipse.jetty.security.HashLoginService">
<property name="name" value="ActiveMQRealm" />
<property name="config" value="${activemq.conf}/jetty-realm.properties" />
</bean>
<bean id="securityConstraint" class="org.eclipse.jetty.util.security.Constraint">
<property name="name" value="BASIC" />
<property name="roles" value="user,admin" />
<!-- set authenticate=false to disable login -->
<property name="authenticate" value="true" />
</bean>
<bean id="adminSecurityConstraint" class="org.eclipse.jetty.util.security.Constraint">
<property name="name" value="BASIC" />
<property name="roles" value="admin" />
<!-- set authenticate=false to disable login -->
<property name="authenticate" value="true" />
</bean>
<bean id="securityConstraintMapping" class="org.eclipse.jetty.security.ConstraintMapping">
<property name="constraint" ref="securityConstraint" />
<property name="pathSpec" value="/admin/*,*.jsp" />
</bean>
<bean id="adminSecurityConstraintMapping" class="org.eclipse.jetty.security.ConstraintMapping">
<property name="constraint" ref="adminSecurityConstraint" />
<property name="pathSpec" value="*.action" />
</bean>
<bean id="securityHandler" class="org.eclipse.jetty.security.ConstraintSecurityHandler">
<property name="loginService" ref="securityLoginService" />
<property name="authenticator">
<bean class="org.eclipse.jetty.security.authentication.BasicAuthenticator" />
</property>
<property name="constraintMappings">
<list>
<ref bean="adminSecurityConstraintMapping" />
<ref bean="securityConstraintMapping" />
</list>
</property>
<property name="handler">
<bean id="sec" class="org.eclipse.jetty.server.handler.HandlerCollection">
<property name="handlers">
<list>
<bean class="org.eclipse.jetty.webapp.WebAppContext">
<property name="contextPath" value="/hawtio" />
<property name="war" value="${activemq.home}/webapps/hawtio" />
<property name="logUrlOnStart" value="true" />
</bean>
<bean class="org.eclipse.jetty.webapp.WebAppContext">
<property name="contextPath" value="/admin" />
<property name="resourceBase" value="${activemq.home}/webapps/admin" />
<property name="logUrlOnStart" value="true" />
</bean>
<bean class="org.eclipse.jetty.webapp.WebAppContext">
<property name="contextPath" value="/fileserver" />
<property name="resourceBase" value="${activemq.home}/webapps/fileserver" />
<property name="logUrlOnStart" value="true" />
<property name="parentLoaderPriority" value="true" />
</bean>
<bean class="org.eclipse.jetty.webapp.WebAppContext">
<property name="contextPath" value="/api" />
<property name="resourceBase" value="${activemq.home}/webapps/api" />
<property name="logUrlOnStart" value="true" />
</bean>
<bean class="org.eclipse.jetty.server.handler.ResourceHandler">
<property name="directoriesListed" value="false" />
<property name="welcomeFiles">
<list>
<value>index.html</value>
</list>
</property>
<property name="resourceBase" value="${activemq.home}/webapps/" />
</bean>
<bean id="defaultHandler" class="org.eclipse.jetty.server.handler.DefaultHandler">
<property name="serveIcon" value="false" />
</bean>
</list>
</property>
</bean>
</property>
</bean>
<bean id="rewrite" class="org.eclipse.jetty.rewrite.handler.RewriteHandler">
<property name="rules">
<set>
<bean class="org.eclipse.jetty.rewrite.handler.RedirectRegexRule">
<property name="regex" value="/api/jolokia(.*)"/>
<property name="replacement" value="/hawtio/jolokia$1"/>
</bean>
</set>
</property>
</bean>
<bean id="contexts" class="org.eclipse.jetty.server.handler.ContextHandlerCollection">
</bean>
<bean id="jettyPort" class="org.apache.activemq.web.WebConsolePort" init-method="start">
<!-- the default port number for the web console -->
<property name="port" value="8162"/>
</bean>
<bean id="Server" depends-on="jettyPort" class="org.eclipse.jetty.server.Server" init-method="start"
destroy-method="stop">
<property name="connectors">
<list>
<bean id="Connector" class="org.eclipse.jetty.server.nio.SelectChannelConnector">
<!-- see the jettyPort bean -->
<property name="port" value="#{systemProperties['jetty.port']}" />
</bean>
<!--
Enable this connector if you wish to use https with web console
-->
<!--
<bean id="SecureConnector" class="org.eclipse.jetty.server.ssl.SslSelectChannelConnector">
<property name="port" value="8162" />
<property name="keystore" value="file:${activemq.conf}/broker.ks" />
<property name="password" value="password" />
</bean>
-->
</list>
</property>
<property name="handler">
<bean id="handlers" class="org.eclipse.jetty.server.handler.HandlerCollection">
<property name="handlers">
<list>
<ref bean="rewrite"/>
<ref bean="contexts" />
<ref bean="securityHandler" />
</list>
</property>
</bean>
</property>
</bean>
</beans>
修改完成后进入cmd，启动E:\activemq1\bin\activemq.bat；E:\activemq2\bin\activemq.bat，下面贴出测试代码：
package activemq.test;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.DeliveryMode;
import javax.jms.Destination;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.junit.Test;
public class ActivemqTest {
@Test
public void testQueueSender() {
try {
//通过username,password,url创建连接工厂接口
ConnectionFactory factory = new ActiveMQConnectionFactory(
"system",
"manager", "failover:(tcp://localhost:61616,tcp://localhost:61617)?initialReconnectDelay=100");
//通过连接工厂创建一个新的连接接口
Connection connection = factory.createConnection();
//通过连接接口创建一个会话接口 消息应答模式：Session.AUTO_ACKNOWLEDGE
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
//会话接口创建有关主题的目标接口
Destination destination = session.createQueue("test_queue");
//会话接口再根据目标接口来创建一个消息生产者接口
MessageProducer producer = session.createProducer(destination);
producer.setDeliveryMode(DeliveryMode.PERSISTENT);
//调用会话生成一个文本消息
Message message = session.createTextMessage("发送消息：Hello ActiveMQ Text Messagedwq ！");
long time = System.currentTimeMillis();
//通过生产者接口Send将消息发布到ActiveMQ服务器
producer.send(message);
System.out.println((System.currentTimeMillis()-time) + "ms");
//关闭会话
session.close();
//关闭连接
connection.close();
} catch (Exception e) {
e.printStackTrace();
}
}
@Test
public void testQueueReceiver() {
try {
// 通过username,password,url创建连接工厂接口
ConnectionFactory factory = new ActiveMQConnectionFactory(
"system",
"manager", "failover:(tcp://localhost:61616,tcp://localhost:61617)?initialReconnectDelay=100");
// 通过连接工厂创建一个新的连接接口
Connection connection = factory.createConnection();
connection.start();
// 通过连接接口创建一个会话接口
Session session = connection.createSession(false,
Session.AUTO_ACKNOWLEDGE);
// 会话接口创建有关主题的目标接口
Destination destination = session.createQueue("test_queue");
// 会话接口再根据目标接口来创建一个消息消费者接口
MessageConsumer consumer = session.createConsumer(destination);
long time = System.currentTimeMillis();
// 消息消费者接收消息 同步消息
TextMessage message = (TextMessage) consumer.receive();
if (null != message) {
System.out.println("收到消息：" + message.getText());
}
System.out.println((System.currentTimeMillis()-time) + "ms");
// 关闭会话
session.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
linux环境与上面基本一致，只需要更改文件地址即可。
SharedFile System Master Slave(共享文件系统)做ActiveMQ集群的更多相关文章
- 【摘录】JDBC Master Slave(JDBC方式的JMS集群)
JDBC Master Slave First supported in ActiveMQ version 4.1 If you are using pure JDBC and not using t ...
- ActiveMQ集群应用
ActiveMQ集群 ActiveMQ具有强大和灵活的集群功能,但在使用的过程中会发现很多的缺点,ActiveMQ的集群方式主要由两种:Master-Slave和Broker Cluster. 1.M ...
- ActiveMQ集群(2)
ActiveMQ具有强大和灵活的集群功能,但在使用的过程中会发现很多的缺点,ActiveMQ的集群方式主要有两种:Master-Slave和Broker Cluster. 1.Master-Slave ...
- ActiveMQ Cluster (ActiveMQ 集群) 配置
构建高可用的ActiveMQ系统在生产环境中是非常重要的,对于这个apache的消息中间件实现高可用非常简单,只要在Apache ActiveMQ单点基本配置基础上做一次配置变更(如果在一台设备上部署 ...
- 使用jmeter对ActiveMQ集群性能方案进行评估--转载
原文地址:http://www.51testing.com/html/78/23978-143163.html 1.测试概要1.1 关于这篇文档中涉及的基于JMS的消息系统能为应用程序提供可靠的,高性 ...
- ActiveMQ集群支持Master/Slave模式
现在ActiveMQ, 在Failover方面有两种解决方案:Pure Master Slave和Shared File System Master Slave. 先看Pure Master ...
- 分布式ActiveMQ集群
分布式ActiveMQ集群的部署配置细节: 官方资料:http://activemq.apache.org/clustering.html 基本上看这个就足够了,本文就不具体分析配置文件了. 1.Qu ...
- 分布式ActiveMQ集群--转载
原文地址:http://shensy.iteye.com/blog/1752529 回顾总结前一段时间学习的ActiveMQ分布式集群相关的知识,分享出来希望对看到的人有所帮助. 一.分布式Activ ...
- ActiveMQ集群方案
集群方案主要为了解决系统架构中的两个关键问题:高可用和高性能.ActiveMQ服务的高可用性是指,在ActiveMQ服务性能不变.数据不丢失的前提下,确保当系统灾难出现时ActiveMQ能够持续提供消 ...
随机推荐
- Web前端工程师常去的15个技术网站
1.CSDN 网址:https://www.csdn.net/ 简介: CSDN (Chinese Software Developer Network) 创立于1999年,是中国最大的IT社区和服务 ...
- JVM 系列 ClassLoader
JVM 系列()ClassLoader 在前面一节中,主要介绍了 Class 的装载过程,Class 的装载大体上可以分为加载类.连接类和初始化 3 个阶段.本小节将主要介绍绍 Java 语言中的 C ...
- word-break:break-all; 和 word-wrap:break-word 换行
word-break:break-all; 和 word-wrap:break-word;两种写法都是让英文句子在父级宽度不够的情况下换行. 两个属性都同样是让文字换行,但存在着细微的区别,大部分时候 ...
- org.hibernate.HibernateException: /hibernate.cfg.xml not found等三个问题
初次配置hibernate在myeclipse上: 出现三个问题,怎么都不好使,比对代码,没有问题,查看路径还是没有问题: 1.org.hibernate.HibernateException: /h ...
- Vivado 常见报错
1.[Synth 8-2543] port connections cannot be mixed ordered and named 说明例化时最后一个信号添加了一个逗号. 2. 原因:报告说明有一 ...
- ArcGIS Desktop Python add-ins 共享和安装插件
1) 共享和安装插件 共享Python插件的关键是.esriaddin文件;为了获取该插件功能,其他用户只要在本机执行安装操作或通过网络引用该插件就可以. ArcGIS插件安装工具 当用户双击一个 ...
- Java文件复制删除操作合集
import java.io.*; public class FileOperate { public FileOperate() { } /** * 新建目录 * @param folderPath ...
- oracle创建新的用户 创建序列 并生成自动自增
1.用有dba权限的用户登录:sys用户 system 口令:manager 2.创建一个新用户:create user abc identified by 123456; 3.授予DBA权限: gr ...
- 图片转化为pdf（转）
方法1: 利用Adobe公司的Adobe Acrobat Professional进行转化.注意,一定是Professional版本的,Reader版本没有这个功能. 首先安装Adobe Acrob ...
- hdu 3664 1~n排列（ai>i ) 为k个数
http://acm.hdu.edu.cn/showproblem.php?pid=3664 求1~n的排列个数,使得逆序数(ai>i ) 为给定的k. dp[i][j]表示前1~i的排列中,有 ...