rabbitmq - java client lib一二事

由于不可抗因素， 需要给对接方撸一个client的demo。基于比较老的jdk。

所幸找到了这里：http://www.rabbitmq.com/releases/rabbitmq-java-client

干脆拿第一版1.4.0开撸，以下demo：

import java.io.IOException;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.MessageProperties;
import com.rabbitmq.client.ConnectionParameters;

public class NewTask {

  private static final String TASK_QUEUE_NAME = "your_xxx_queue";

  public static void main(String[] argv)
                      throws java.io.IOException {
    String hostName ="your.domain.name";
    int portNumber = 5672;//AMQP.PROTOCOL.PORT
    int ticket =  0;
    ConnectionParameters params = new ConnectionParameters();
    params.setUsername("username_xxx");
    params.setPassword("password_xxx");
    params.setVirtualHost("virutalhost_xxxx");
    params.setRequestedHeartbeat(0);//TODO:
    ConnectionFactory factory = new ConnectionFactory(params);
    Connection connection = factory.newConnection(hostName, portNumber);

    Channel channel = connection.createChannel();

    channel.queueDeclare(ticket,TASK_QUEUE_NAME, false, true, false, false, null);
    /*
    queueDeclare(int ticket,
                                  java.lang.String queue,
                                  boolean passive,
                                  boolean durable,
                                  boolean exclusive,
                                  boolean autoDelete,
                                  java.util.Map<java.lang.String,java.lang.Object> arguments)
    */

    String message = "hello";

    //http://www.rabbitmq.com/releases/rabbitmq-java-client/v1.4.0/rabbitmq-java-client-javadoc-1.4.0/com/rabbitmq/client/Channel.html#basicPublish
    channel.basicPublish(ticket, "", TASK_QUEUE_NAME,
            MessageProperties.PERSISTENT_TEXT_PLAIN,
            message.getBytes());
    System.out.println(" [x] Sent '" + message + "'");
    int closeCode = 200;
    String closeMessage="job done.";
    channel.close(closeCode, closeMessage);
    connection.close();
  }
  //...
}

基本是看着api文档改的，不同版本的api还真是出入不小（特别httpclient_xxx.jar)，还好rabbitmq的java client差异不太大。

有两疑问：

1. ticket干嘛的：

貌似官方的faq里面有提到：http://rabbitmq.1065348.n5.nabble.com/What-is-ticket-object-and-how-does-it-get-created-td11931.html

意思初期的不太成熟的一个安全措施的想法， 后面给砍了。 传0即可。

2. closecode 

默认的close函数用了默认的closecode ,和closemessage。

https://www.rabbitmq.com/releases/rabbitmq-java-client/current-javadoc/com/rabbitmq/client/Connection.html#close--

因此低版本中，需要显示的传这两个参数就好了：

closecode:200, 参考：https://www.rabbitmq.com/releases/rabbitmq-java-client/current-javadoc/constant-values.html#com.rabbitmq.client.AMQP.REPLY_SUCCESS

closemessage: 'OK'

来源（为了更好的排版阅读）:http://www.cnblogs.com/Tommy-Yu/p/6402672.html