基于EMQX以切分消息方式发送文件

1、引入jar包如下：

1> mqtt-client-1.16-SNAPSHOT.jar
2> hawtbuf-1.11.jar
3> hawtdispatch-1.22.jar
4> hawtdispatch-transport-1.22.jar

2、代码如下：

package com.cnd.poc;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;
import java.net.URLEncoder;

import org.fusesource.mqtt.client.Future;
import org.fusesource.mqtt.client.FutureConnection;
import org.fusesource.mqtt.client.MQTT;
import org.fusesource.mqtt.client.Message;
import org.fusesource.mqtt.client.QoS;
import org.fusesource.mqtt.client.Topic;

public class TestMqttClientFuture {

	private static String EMQX_Cluster_URL = "mqttpoc.yourcompany.com";

	private static int EMQX_Cluster_Broker_Port = 1883;

	private static String EMQX_Cluster_Access_UserName = "can_do";

	private static String EMQX_Cluster_Access_Password = "passw0rd";

	private static String EMQX_Cluster_Topic_Name = "YourTm/01012345678";

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		MQTT mqtt = new MQTT();
		try {
			mqtt.setHost(EMQX_Cluster_URL, EMQX_Cluster_Broker_Port);
			mqtt.setUserName(EMQX_Cluster_Access_UserName);
			mqtt.setPassword(EMQX_Cluster_Access_Password);

		} catch (URISyntaxException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		FutureConnection connection = mqtt.futureConnection();

		boolean isFuture = true;

		Future<Void> f1 = connection.connect();
		try {
			f1.await();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		Future<byte[]> f2 = connection.subscribe(new Topic[] { new Topic(EMQX_Cluster_Topic_Name, QoS.AT_LEAST_ONCE) });
		try {
			byte[] qoses = f2.await();

		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		// We can start future receive..
		Future<Message> receive = connection.receive();
		// how to retrieve message from future object

		// send the message..
		// send file with byte[] in splitted message
		boolean isSendFileMsg = false;
		if (isSendFileMsg) {
			Future<Void> f3 = connection.publish(EMQX_Cluster_Topic_Name, "Hello can_do 24".getBytes(),
					QoS.EXACTLY_ONCE, false);

			// Then the receive will get the message.
			Message message = null;
			try {
				message = receive.await();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			message.ack();

			System.out.print("=message is:=" + new String(message.getPayload()) + "=end=");
		}

		String fileName = "E:\\to_removed\\20190610\\test_mqtt_file_transfer_del.txt";

		int permFragmentSize = 64;

		boolean isDelFileAfterSent = false;

		sendFileInByteArray(connection, fileName, permFragmentSize, isDelFileAfterSent);

		if (!isFuture) {
			Future<Void> f4 = connection.disconnect();
			try {
				f4.await();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

	/**
	 * send file with byte array
	 */
	public static boolean sendFileInByteArray(FutureConnection paramConn, String paramFileAbsPath,
			int paramPermFragmentSize, boolean delWhenFinished) {
		boolean isSendSuccessful = false;

		File file = new File(paramFileAbsPath);

		InputStream in = null;

		int PER_FRAGMENT_SIZE = paramPermFragmentSize;

		try {
			String encodedName = URLEncoder.encode(file.getName(), "UTF-8");
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		try {
			byte[] block = new byte[PER_FRAGMENT_SIZE];
			int byteread = 0;
			in = new FileInputStream(paramFileAbsPath);

			int i = 0;
			while ((byteread = in.read(block)) != -1) {
				i++;
				paramConn.publish(EMQX_Cluster_Topic_Name, block, QoS.EXACTLY_ONCE, false);
				// Note:you need to clear byte[] after every time sent
				// This statement is vip
				block = new byte[PER_FRAGMENT_SIZE];
			}
			System.out.println("=i is:=" + i + "=end=");

			isSendSuccessful = true;
		} catch (Exception e1) {
			e1.printStackTrace();

			if (in != null)
				try {
					in.close();
				} catch (IOException localIOException) {
				}
		} finally {
			if (in != null)
				try {
					in.close();
				} catch (IOException localIOException1) {
				}
		}
		if (isSendSuccessful) {
			if (delWhenFinished) {
				String strFileReadme = file.getName().split("\\[_]")[0];
				File tmpFile = new File(file.getParent() + File.separator + strFileReadme);
				if (tmpFile.exists()) {
					tmpFile.delete();
				}
				file.delete();
			}
		}
		return isSendSuccessful;
	}

}