Producer.java

/**
 * Copyright (C) 2010-2013 Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.rocketmq.example.simple;

import com.alibaba.rocketmq.client.exception.MQClientException;
import com.alibaba.rocketmq.client.producer.DefaultMQProducer;
import com.alibaba.rocketmq.client.producer.SendResult;
import com.alibaba.rocketmq.common.message.Message;


public class Producer {
    public static void main(String[] args) throws MQClientException, InterruptedException {
        /**
         * 一个应用创建一个Producer，由应用来维护此对象，可以设置为全局对象或者单例<br>
         * 注意：ProducerGroupName需要由应用来保证唯一<br>
         * ProducerGroup这个概念发送普通的消息时，作用不大，但是发送分布式事务消息时，比较关键，
         * 因为服务器会回查这个Group下的任意一个Producer
         */
        DefaultMQProducer producer = new DefaultMQProducer("ProducerGroupName");

        /**
         * Producer对象在使用之前必须要调用start初始化，初始化一次即可<br>
         * 注意：切记不可以在每次发送消息时，都调用start方法
         */
        producer.start();

        /**
         * 下面这段代码表明一个Producer对象可以发送多个topic，多个tag的消息。
         * 注意：send方法是同步调用，只要不抛异常就标识成功。但是发送成功也可会有多种状态，<br>
         * 例如消息写入Master成功，但是Slave不成功，这种情况消息属于成功，但是对于个别应用如果对消息可靠性要求极高，<br>
         * 需要对这种情况做处理。另外，消息可能会存在发送失败的情况，失败重试由应用来处理。
         */
        try {
            {
                Message msg = new Message("TopicTest1",// topic
                    "TagA",// tag
                    "OrderID001",// key
                    ("Hello MetaQ").getBytes());// body
                SendResult sendResult = producer.send(msg);
                System.out.println(sendResult);
            }

            {
                Message msg = new Message("TopicTest2",// topic
                    "TagB",// tag
                    "OrderID0034",// key
                    ("Hello MetaQ").getBytes());// body
                SendResult sendResult = producer.send(msg);
                System.out.println(sendResult);
            }

            {
                Message msg = new Message("TopicTest3",// topic
                    "TagC",// tag
                    "OrderID061",// key
                    ("Hello MetaQ").getBytes());// body
                SendResult sendResult = producer.send(msg);
                System.out.println(sendResult);
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }

        /**
         * 应用退出时，要调用shutdown来清理资源，关闭网络连接，从MetaQ服务器上注销自己
         * 注意：我们建议应用在JBOSS、Tomcat等容器的退出钩子里调用shutdown方法
         */
        producer.shutdown();
    }
}