(1):下载erlang,原因在于RabbitMQ服务端代码是使用并发式语言erlang编写的,下载地址:http://www.erlang.org/downloads,安装完成之后创建一个名为ERLANG_HOME的环境变量,其值指向erlang的安装目录,同时将%ERLANG_HOME%\bin加入到Path中,最后打开命令行(注意以管理员身份运行),输入erl,如果出现erlang的版本信息就表示erlang语言环境安装成功;
(2):下载RabbitMQ,下载地址:http://www.rabbitmq.com/,默认的安装目录是C:\Program Files\RabbitMQ Server,这个目录中是存在空格符的,我们需要改变安装目录;
(3):安装RabbitMQ-Plugins,这个相当于是一个管理界面,方便我们在浏览器界面查看RabbitMQ各个消息队列以及exchange的工作情况,安装方法是:打开命令行(注意以管理员身份运行)cd进入rabbitmq的bin目录,输入:rabbitmq-plugins enable rabbitmq_management命令,稍等会会发现出现plugins安装成功的提示,如果在安装插件的过程中出现错误:首先在命令行输入:rabbitmq-service stop,接着输入rabbitmq-service remove,再接着输入rabbitmq-service install,接着输入rabbitmq-service start,最后重新输入rabbitmq-plugins enable rabbitmq_management;
(4):插件安装完之后,在浏览器输入http://localhost:15672进行验证,输入用户名:guest,密码:guest你就可以进入管理界面,当然用户名密码你都可以变的;
producer:消息生产者
consumer:消息消费者
virtual host:虚拟主机,在RabbitMQ中,用户只能在虚拟主机的层面上进行一些权限设置,比如我可以访问哪些队列,我可以处理哪些请求等等;
broker:消息转发者,也就是我们RabbitMQ服务端充当的功能了,那么消息是按照什么规则进行转发的呢?需要用到下面几个概念;
exchange:交换机,他是和producer直接进行打交道的,有点类似于路由器的功能,主要就是进行转发操作的呗,那么producer到底用哪个exchange进行路由呢?这个取决于routing key(路由键),每个消息都有这个键,我们也可以自己设定,其实就是一字符串;
queue:消息队列,用于存放消息,他接收exchange路由过来的消息,我们可以对队列内容进行持久化操作,那么queue到底接收那个exchange路由的消息呢?这个时候就要用到binding key(绑定键)了,绑定键会将队列和exchange进行绑定;
producer(生产者)端步骤:
(1):创建ConnectionFactory,并且设置一些参数,比如hostname,portNumber等等
(2):利用ConnectionFactory创建一个Connection连接
(3):利用Connection创建一个Channel通道
(4):创建queue并且和Channel进行绑定
(5):创建消息,并且发送到队列中
注意,在我们当前的例子中,并没有用到exchange交换机,RabbitMQ默认情况下是会创建一个空字符串名字的exchange的,如果我们没有创建自己的exchange的话,默认就是使用的这个exchange;
producer端代码:
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.MessageProperties;
public class Sender {
private final static String QUEUE_NAME = "messageQueue";
public static void main(String[] args) {
send();
}
public static void send() {
ConnectionFactory factory = null;
Connection connection = null;
Channel channel = null;
try {
factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
factory.setUsername("guest");
factory.setPassword("guest");
connection = factory.newConnection();
channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
String message = "you will receive some messages";
channel.basicPublish("", QUEUE_NAME, null, message.getBytes("UTF-8"));
for (int i = 1; i <= 3; i++) {
Thread.sleep(1000);
String meString = new String("第" + i + "条消息");
channel.basicPublish("", QUEUE_NAME, MessageProperties.PERSISTENT_TEXT_PLAIN, meString.getBytes());
System.out.println(meString);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
channel.close();
connection.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
consumer(消费者)端步骤:
(1):创建ConnectionFactory,并且设置一些参数,比如hostname,portNumber等等
(2):利用ConnectionFactory创建一个Connection连接
(3):利用Connection创建一个Channel通道
(4):将queue和Channel进行绑定,注意这里的queue名字要和前面producer创建的queue一致
(5):创建消费者Consumer来接收消息,同时将消费者和queue进行绑定
consumer端代码:
import java.io.IOException;
import com.rabbitmq.client.AMQP.BasicProperties;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Consumer;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;
public class Receiver {
private final static String QUEUE_NAME = "messageQueue";
public static void main(String[] args) {
receive();
}
public static void receive() {
ConnectionFactory factory = null;
Connection connection = null;
Channel channel = null;
try {
factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
factory.setUsername("guest");
factory.setPassword("guest");
connection = factory.newConnection();
channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
Consumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties,
byte[] body) throws IOException {
String message = new String(body, "UTF-8");
System.out.println("收到消息:" + message);
}
};
channel.basicConsume(QUEUE_NAME, true, consumer);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
Thread.sleep(30000);
channel.close();
connection.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
代码需要导入依赖包rabbit-client.jar。下载地址:http://www.rabbitmq.com/releases/rabbitmq-java-client/v3.3.4/rabbitmq-java-client-bin-3.3.4.zip
连接的代码如下:
factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
factory.setUsername("guest");
factory.setPassword("guest");
默认安装好rabbitmq就有服务(windows服务),但没有web监控(localhost:15672);
默认的端口就是5672,用户guest密码guest,但这个用户名只能在本机访问,如果要网络访问,需要做用户管理;
1、如果写错了host (如:factory.setHost(“localhost1”); )报错:
java.net.UnknownHostException: localhost1
2、如果写错了HOST的IP(如:factory.setHost(“192.168.1.10”); )无此地址, 报错:
java.net.ConnectException: Connection timed out: connect
3、如果写错端口PORT(如:factory.setPort(5678);) 报错:
java.net.ConnectException: Connection refused: connect
4、如果写错用户名或者密码,报错:
com.rabbitmq.client.AuthenticationFailureException: ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. For details see the broker logfile.