RocketMQ简单实例搭建
1、安装RocketMQ（在Linux环境下，我用的是Centos6.5）
安装RocketMQ需要jdk1.6以上, maven,git环境，以上环境自行百度命令安装。
git clone https://github.com/alibaba/RocketMQ.git ##从github上下载RocketMQ开源项目
cd RocketMQ ##进入文件夹
sh install.sh ##开始安装
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安装完之后可以看到下图这样：其中可以看到一个符号链接devenv如红框所示
然后
cd devenv/bin ##进入链接的目录下的bin目录
nohup sh mqnamesrv -n "121.42.179.195:9876" & ##配置nameserver，121.42.179.195是本机ip，也就是服务器外网地址
nohup sh mqbroker -n "121.42.179.195:9876" & ##配置broker，121.42.179.195同上
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之后
cat nohup.out
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在输出的最低端，可以看到红框中的两句话则说明nameserver和broker启动成功。
如果服务器内存不够，你就会启动失败，可以修改runbroker.sh脚本（mqbroker文件中通过runbroker.sh脚本调用Broker的主函数com.alibaba.rocketmq.broker.BrokerStartup启动Broker）的JAVA_OPT参数
vi runbroker.sh
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我阿里云内存小，我就改成这样
JAVA_OPT="${JAVA_OPT} -server -Xms128m -Xmx128m -Xmn128m -XX:PermSize=128m -XX:MaxPermSize=128m"
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2、编写Consumer和Producer测试类
首先需要的jar包如下：
<?xml version="1.0" encoding="UTF-8"?>
<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>groupId</groupId>
<artifactId>RocketMQ</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
<name>RocketMQTest</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>com.alibaba.rocketmq</groupId>
<artifactId>rocketmq-client</artifactId>
<version>3.0.10</version>
</dependency>
<dependency>
<groupId>com.alibaba.rocketmq</groupId>
<artifactId>rocketmq-all</artifactId>
<version>3.0.10</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
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Consumer类：
public class Consumer {
public static void main(String[] args) throws MQClientException {
DefaultMQPushConsumer consumer = new DefaultMQPushConsumer(
"rmq-group");
consumer.setNamesrvAddr("121.42.179.195:9876");
consumer.setInstanceName("consumer");
consumer.subscribe("TopicA-test", "TagA");
consumer.registerMessageListener(new MessageListenerConcurrently() {
@Override
public ConsumeConcurrentlyStatus consumeMessage(
List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
for (MessageExt msg : msgs) {
System.out.println(new String(msg.getBody()));
}
return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
}
});
consumer.start();
System.out.println("Consumer Started.");
}
}
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Producer类：
public class Producer {
public static void main(String[] args) throws MQClientException {
DefaultMQProducer producer = new DefaultMQProducer("rmq-group");
producer.setNamesrvAddr("121.42.179.195:9876");
producer.setInstanceName("producer");
producer.start();
try {
for (int i = 0; i < 10; i++) {
Thread.sleep(1000); //每秒发送一次MQ
Message msg = new Message("TopicA-test",// topic
"TagA",// tag
(new Date() + "Hello RocketMQ ,QuickStart" + i)
.getBytes()// body
);
SendResult sendResult = producer.send(msg);
}
} catch (Exception e) {
e.printStackTrace();
}
producer.shutdown();
}
}
之后分别启动，Consumer效果如下
这里需要注意，
默认情况下，一台服务器只能启动一个Producer或Consumer实例，所以如果需要在一台服务器启动多个实例，需要设置实例的名称，如要再建一个producer：
producer.setNamesrvAddr(“121.42.179.195:9876”);
producer.setInstanceName(“Producer2”);
原文：https://blog.csdn.net/coffeesweet/article/details/52451860
