ZeroMQ--使用jzmq进行编程

一、环境搭建 wget http://download.zeromq.org/zeromq-2.1.7.tar.gztar -xzf zeromq-2.1.7.tar.gzcd zeromq-2.1

一、环境搭建

wget http://download.zeromq.org/zeromq-2.1.7.tar.gztar -xzf zeromq-2.1.7.tar.gzcd zeromq-2.1.7./configuremakesudo make installgit clone https://github.com/nathanmarz/jzmq.gitcd jzmq./autogen.sh./configuremakesudo make install如果没有安装libtool、libuuid-devel则需要先安装，否则安装失败yum install libtoolyum install libuuid-devel

常见问题：

出现java.lang.UnsatisfiedLinkError: /usr/local/lib/libjzmq.so.0.0.0: libzmq.so.1: cannot open shared object file: No such file or directory异常
原因是未找到zmq动态链接库。
解决方法1：export LD_LIBRARY_PATH=/usr/local/lib
解决方法2：编辑/etc/ld.so.conf文件，增加一行：/usr/local/lib。再执行sudo ldconfig命令

Exception in thread "main" java.lang.UnsatisfiedLinkError: no jzmq in java.library.path
未设置native library
在eclipse设置native library为/usr/local/lib
或在jvm增加参数
-Djava.library.path=/usr/local/lib
或在启动脚本中增加
java -Djava.library.path=/usr/local/lib

二、使用jzmq进行编程

    1.创建maven项目，pom.xml的内容参见pom.xml

      注意：jzmq的版本不能太高，建议使用2.1.0，目前storm也是使用这个版本的jzmq-2.1.0.jar

      否则报： java.lang.UnsatisfiedLinkError: org.zeromq.ZMQ$Socket.nativeInit()V

    2.编写Publisher.java,Subscriber.java,参见源代码

    Publisher.java  

package com.catt.mqtest.pubsub;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.zeromq.ZMQ;import org.zeromq.ZMQ.Context;import org.zeromq.ZMQ.Socket;public class Publisher {	// 等待10个订阅者	private static final int SUBSCRIBERS_EXPECTED = 10;	// 定义一个全局的记录器，通过LoggerFactory获取	private final static Logger log = LoggerFactory.getLogger(Publisher.class);	public static void main(String[] args) throws InterruptedException{		Context context = ZMQ.context(1);		Socket publisher = context.socket(ZMQ.PUB);		publisher.bind("tcp://*:5557");		try {			// zmq发送速度太快，在订阅者尚未与发布者建立联系时，已经开始了数据发布			Thread.sleep(1000);		} catch (InterruptedException e) {			e.printStackTrace();		}		publisher.send("send start......".getBytes(), 0);		for (int i = 0; i < 10; i++) {			publisher.send(("Hello world "+i).getBytes(), ZMQ.NOBLOCK);		}		publisher.send("send end......".getBytes(), 0);		publisher.close();		context.term();	}}

Subscriber.java

package com.catt.mqtest.pubsub;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.zeromq.ZMQ;import org.zeromq.ZMQ.Context;import org.zeromq.ZMQ.Socket;public class Subscriber {	// 定义一个全局的记录器，通过LoggerFactory获取	private final static Logger log = LoggerFactory.getLogger(Subscriber.class);	public static void main(String[] args) {		Context context = ZMQ.context(1);		Socket subscriber = context.socket(ZMQ.SUB);		subscriber.connect("tcp://192.168.230.128:5557");		subscriber.subscribe("".getBytes());		int total = 0;		while (true) {			byte[] stringValue = subscriber.recv(0);			String string = new String(stringValue);			if (string.equals("send end......")) {				break;			}			total++;			System.out.println("Received " + total + " updates. :" + string);		}		subscriber.close();		context.term();	}}

pom.xml

<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>com.catt</groupId>	<artifactId>mqtest</artifactId>	<version>0.0.1-SNAPSHOT</version>	<packaging>jar</packaging>	<name>mqtest</name>	<url>http://maven.apache.org</url>	<properties>		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>	</properties>	<dependencies>		<dependency>			<groupId>org.zeromq</groupId>			<artifactId>jzmq</artifactId>			<version>2.1.0</version>		</dependency>		<dependency>			<groupId>ch.qos.logback</groupId>			<artifactId>logback-classic</artifactId>			<version>1.1.1</version>		</dependency>		<dependency>			<groupId>junit</groupId>			<artifactId>junit</artifactId>			<version>4.10</version>			<scope>test</scope>		</dependency>	</dependencies></project>