fusesource版本：mqtt-client-1.10.jar
下载地址：https://github.com/fusesource/mqtt-client
fusesource提供三种方式实现发布消息的方式：
1.采用阻塞式的连接的（BlockingConnection）
2.采用回调式的连接 （CallbackConnection）
3.采用Future样式的连接（FutureConnection）
其中，回调API是最复杂的也是性能最好的，
另外两种均是对回调API的封装。 我们下面就简单介绍一下回调API的使用方法。
1.客户端实现：
package com.ctfo.mqtt.client.demo.fusesource;
import java.net.URISyntaxException;
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;
/**
* 采用Future模式 订阅主题
*/
public class MQTTFutureClient {
private final static String CONNECTION_STRING = "tcp://192.168.13.240:1883";
private final static boolean CLEAN_START = true;
private final static short KEEP_ALIVE = 30;// 低耗网络，但是又需要及时获取数据，心跳30s
private final static String CLIENT_ID = "client";
public static Topic[] topics = {
new Topic("mqtt/aaa", QoS.EXACTLY_ONCE),
new Topic("mqtt/bbb", QoS.AT_LEAST_ONCE),
new Topic("mqtt/ccc", QoS.AT_MOST_ONCE) };
public final static long RECONNECTION_ATTEMPT_MAX = 6;
public final static long RECONNECTION_DELAY = 2000;
public final static int SEND_BUFFER_SIZE = 2 * 1024 * 1024;// 发送最大缓冲为2M
public static void main(String[] args) {
// 创建MQTT对象
MQTT mqtt = new MQTT();
try {
// 设置mqtt broker的ip和端口
mqtt.setHost(CONNECTION_STRING);
// 连接前清空会话信息
mqtt.setCleanSession(CLEAN_START);
// 设置重新连接的次数
mqtt.setReconnectAttemptsMax(RECONNECTION_ATTEMPT_MAX);
// 设置重连的间隔时间
mqtt.setReconnectDelay(RECONNECTION_DELAY);
// 设置心跳时间
mqtt.setKeepAlive(KEEP_ALIVE);
// 设置缓冲的大小
mqtt.setSendBufferSize(SEND_BUFFER_SIZE);
//设置客户端id
mqtt.setClientId(CLIENT_ID);
// 获取mqtt的连接对象BlockingConnection
final FutureConnection connection = mqtt.futureConnection();
connection.connect();
connection.subscribe(topics);
while (true) {
Future<Message> futrueMessage = connection.receive();
Message message = futrueMessage.await();
System.out.println("MQTTFutureClient.Receive Message " + "Topic Title :" + message.getTopic() + " context :"
+ String.valueOf(message.getPayloadBuffer()));
}
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
}
}
}
2.服务端实现：
package com.ctfo.mqtt.client.demo.fusesource;
import java.net.URISyntaxException;
import org.fusesource.hawtbuf.Buffer;
import org.fusesource.hawtbuf.UTF8Buffer;
import org.fusesource.hawtdispatch.Dispatch;
import org.fusesource.mqtt.client.Callback;
import org.fusesource.mqtt.client.CallbackConnection;
import org.fusesource.mqtt.client.FutureConnection;
import org.fusesource.mqtt.client.Listener;
import org.fusesource.mqtt.client.MQTT;
import org.fusesource.mqtt.client.QoS;
import org.fusesource.mqtt.client.Topic;
import org.fusesource.mqtt.client.Tracer;
import org.fusesource.mqtt.codec.MQTTFrame;
/**
* 采用Future模式 发布主题
*
*/
public class MQTTFutureServer {
private final static String CONNECTION_STRING = "tcp://192.168.13.240:1883";
private final static boolean CLEAN_START = true;
private final static String CLIENT_ID = "server";
private final static short KEEP_ALIVE = 30;// 低耗网络，但是又需要及时获取数据，心跳30s
public static Topic[] topics = {
new Topic("mqtt/aaa", QoS.EXACTLY_ONCE),
new Topic("mqtt/bbb", QoS.AT_LEAST_ONCE),
new Topic("mqtt/ccc", QoS.AT_MOST_ONCE)};
public final static long RECONNECTION_ATTEMPT_MAX=6;
public final static long RECONNECTION_DELAY=2000;
public final static int SEND_BUFFER_SIZE=2*1024*1024;//发送最大缓冲为2M
public static void main(String[] args) {
MQTT mqtt = new MQTT();
try {
//==MQTT设置说明
//设置服务端的ip
mqtt.setHost(CONNECTION_STRING);
//连接前清空会话信息 ,若设为false，MQTT服务器将持久化客户端会话的主体订阅和ACK位置，默认为true
mqtt.setCleanSession(CLEAN_START);
//设置心跳时间 ,定义客户端传来消息的最大时间间隔秒数，服务器可以据此判断与客户端的连接是否已经断开，从而避免TCP/IP超时的长时间等待
mqtt.setKeepAlive(KEEP_ALIVE);
//设置客户端id,用于设置客户端会话的ID。在setCleanSession(false);被调用时，MQTT服务器利用该ID获得相应的会话。
//此ID应少于23个字符，默认根据本机地址、端口和时间自动生成
mqtt.setClientId(CLIENT_ID);
//服务器认证用户名
//mqtt.setUserName("admin");
//服务器认证密码
//mqtt.setPassword("admin");
/*
//设置“遗嘱”消息的内容，默认是长度为零的消息
mqtt.setWillMessage("willMessage");
//设置“遗嘱”消息的QoS，默认为QoS.ATMOSTONCE
mqtt.setWillQos(QoS.AT_LEAST_ONCE);
//若想要在发布“遗嘱”消息时拥有retain选项，则为true
mqtt.setWillRetain(true);
//设置“遗嘱”消息的话题，若客户端与服务器之间的连接意外中断，服务器将发布客户端的“遗嘱”消息
mqtt.setWillTopic("willTopic");
*/
//==失败重连接设置说明
//设置重新连接的次数 ,客户端已经连接到服务器，但因某种原因连接断开时的最大重试次数，超出该次数客户端将返回错误。-1意为无重试上限，默认为-1
mqtt.setReconnectAttemptsMax(RECONNECTION_ATTEMPT_MAX);
//设置重连的间隔时间 ,首次重连接间隔毫秒数，默认为10ms
mqtt.setReconnectDelay(RECONNECTION_DELAY);
//客户端首次连接到服务器时，连接的最大重试次数，超出该次数客户端将返回错误。-1意为无重试上限，默认为-1
//mqtt.setConnectAttemptsMax(10L);
//重连接间隔毫秒数，默认为30000ms
//mqtt.setReconnectDelayMax(30000L);
//设置重连接指数回归。设置为1则停用指数回归，默认为2
//mqtt.setReconnectBackOffMultiplier(2);
//== Socket设置说明
//设置socket接收缓冲区大小，默认为65536（64k）
//mqtt.setReceiveBufferSize(65536);
//设置socket发送缓冲区大小，默认为65536（64k）
mqtt.setSendBufferSize(SEND_BUFFER_SIZE);
////设置发送数据包头的流量类型或服务类型字段，默认为8，意为吞吐量最大化传输
mqtt.setTrafficClass(8);
//==带宽限制设置说明
mqtt.setMaxReadRate(0);//设置连接的最大接收速率，单位为bytes/s。默认为0，即无限制
mqtt.setMaxWriteRate(0);//设置连接的最大发送速率，单位为bytes/s。默认为0，即无限制
//==选择消息分发队列
//若没有调用方法setDispatchQueue，客户端将为连接新建一个队列。如果想实现多个连接使用公用的队列，显式地指定队列是一个非常方便的实现方法
//mqtt.setDispatchQueue(Dispatch.createQueue("mqtt/aaa"));
//==设置跟踪器
/* mqtt.setTracer(new Tracer(){
@Override
public void onReceive(MQTTFrame frame) {
System.out.println("recv: "+frame);
}
@Override
public void onSend(MQTTFrame frame) {
System.out.println("send: "+frame);
}
@Override
public void debug(String message, Object... args) {
System.out.println(String.format("debug: "+message, args));
}
});*/
//使用Future创建连接
final FutureConnection connection= mqtt.futureConnection();
connection.connect();
int count=1;
while(true){
count++;
// 用于发布消息，目前手机段不需要向服务端发送消息
//主题的内容
String message="Hello "+count+" MQTT...";
String topic = "mqtt/bbb";
connection.publish(topic, message.getBytes(), QoS.AT_LEAST_ONCE,
false);
System.out.println("MQTTFutureServer.publish Message "+"Topic Title :"+topic+" context :"+message);
}
//使用回调式API
/* final CallbackConnection callbackConnection=mqtt.callbackConnection();
//连接监听
callbackConnection.listener(new Listener() {
//接收订阅话题发布的消息
@Override
public void onPublish(UTF8Buffer topic, Buffer body, Runnable ack) {
System.out.println("=============receive msg================"+new String(body.toByteArray()));
ack.run();
}
//连接失败
@Override
public void onFailure(Throwable value) {
System.out.println("===========connect failure===========");
callbackConnection.disconnect(null);
}
//连接断开
@Override
public void onDisconnected() {
System.out.println("====mqtt disconnected=====");
}
//连接成功
@Override
public void onConnected() {
System.out.println("====mqtt connected=====");
}
});
//连接
callbackConnection.connect(new Callback<Void>() {
//连接失败
public void onFailure(Throwable value) {
System.out.println("============连接失败："+value.getLocalizedMessage()+"============");
}
// 连接成功
public void onSuccess(Void v) {
//订阅主题
Topic[] topics = {new Topic("mqtt/bbb", QoS.AT_LEAST_ONCE)};
callbackConnection.subscribe(topics, new Callback<byte[]>() {
//订阅主题成功
public void onSuccess(byte[] qoses) {
System.out.println("========订阅成功=======");
}
//订阅主题失败
public void onFailure(Throwable value) {
System.out.println("========订阅失败=======");
callbackConnection.disconnect(null);
}
});
//发布消息
callbackConnection.publish("mqtt/bbb", ("Hello ").getBytes(), QoS.AT_LEAST_ONCE, true, new Callback<Void>() {
public void onSuccess(Void v) {
System.out.println("===========消息发布成功============");
}
public void onFailure(Throwable value) {
System.out.println("========消息发布失败=======");
callbackConnection.disconnect(null);
}
});
}
});
*/
} catch (URISyntaxException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
}