RocketMQ 入门

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只介绍入门使用，不说明原理。

一、需要linux系统，

JDK1.7+

rocketmq http://download.csdn.net/detail/zhangscheng922/9873034

二、配置JAVA_HOME

在 /etc/profile 文件中添加如下，路径需按实际情况

export JAVA_HOME=/usr/local/java
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

三、由于是测试，需要修改RocketMq的JVM参数。默认需要4G内存，修改 bin目下runserver.sh和runbrocker.sh为如下

JAVA_OPT="${JAVA_OPT} -server -Xms512m -Xmx512m -Xmn512 -XX:PermSize=128m -XX:MaxPermSize=320m"

四、启动namesvr和brocker

# nohup sh mqnamesrv &

# nohup sh mqbroker -n "192.168.137.100:9876" -c ../conf/2m-noslave/broker-a.properties>broker.out &

192.168.137.100:9876 ip地址为虚拟机ip,端口9876为默认的。其它nohup命令详解可参考 http://www.cnblogs.com/zq-inlook/p/3577003.html

启动完成后使用jps命令查看 namesrv和brocker是否都已启动。

五、关闭namesrv和brocker

#sh mqshutdown namesrv

#sh mqshutdown broker

六、示例代码（java）

需要rocketmq的jar包，可以去阿里的maven库下一个

生产者

public class Producer {public static void main(String[] args) throws MQClientException, RemotingException, MQBrokerException, InterruptedException {DefaultMQProducer producer=new DefaultMQProducer("group");producer.setNamesrvAddr("192.168.137.200:9876");producer.start();Message msg=null;for (int i = 0; i < 100; i++) {msg=new Message("orders",("orders"+i).getBytes());SendResult result = producer.send(msg);System.out.println(msg);System.out.println(result);Thread.sleep(500);}}}

消费者

public class PushConsumer {public static void main(String[] args) throws MQClientException {DefaultMQPushConsumer consumer=new DefaultMQPushConsumer("consumer");consumer.setNamesrvAddr("192.168.137.200:9876");//开始订阅指定topic和tag的消息consumer.subscribe("orders", null);//设置从什么位置开始读取消息consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);//注册监听器consumer.registerMessageListener(new MessageListenerConcurrently() {@Overridepublic ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> list, ConsumeConcurrentlyContext arg1) {MessageExt msg = list.get(0);System.out.println(new String(msg.getBody()));return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;}});//开始消费consumer.start();}}

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