MQTT通讯及服务器的搭建
1. 首先从http://activemq.apache.org/apollo/download.html官网上下载windows对应的apollo版本，本文下载的是apache-apollo-1.7.1-windows-distro.zip 版本。windows的版本为win10，JDK版本1.8。
2.解压到C:\apache-apollo下，此时会多出一个apache-apollo-1.7.1文件夹。
3.然后以管理员的身份运行cmd，进入到如下目录C:\apache-apollo\apache-apollo-1.7.1\bin，如下图所示：
4.然后就是要创建broker，这里是创建在C:\apache-apollo\broker
的目录下，执行如下命令：apollo create myapolloC:\apache-apollo\broker
5.broker创建成功的提示如下图所示：
6.创建完broker之后就是要运行apollo，进入C:\apache-apollo\broker\bin目录下，执行如下命令：apollo-brokerrun
7.apollo运行成功的提示，如下图所示：
8.最后打开浏览器，输入网址http://127.0.0.1:61680/，即可看到如下页面，默认
账号：admin 密码：password
9.登录成功之后的页面，控制台页面如下图所示：
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.MqttPersistenceException;
import org.eclipse.paho.client.mqttv3.MqttTopic;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
publicclass MqttServerTest {
publicstaticfinal String HOST = "tcp://127.0.0.1:61613";
publicstaticfinal String TOPIC = "toclient/124";
publicstaticfinal String TOPIC125 = "toclient/125";
privatestaticfinal String clientid = "server-id-0";
private MqttClient client;
private MqttTopic topic;
private MqttTopic topic125;
private String userName = "admin";
private String passWord = "password";
private MqttMessage message;
public MqttServerTest() throws MqttException {
// MemoryPersistence设置clientid的保存形式，默认为以内存保存
client = new MqttClient(HOST, clientid, newMemoryPersistence());
connect();
}
privatevoid connect() {
MqttConnectOptions options = new MqttConnectOptions();
options.setCleanSession(false);
options.setUserName(userName);
options.setPassword(passWord.toCharArray());
// 设置超时时间
options.setConnectionTimeout(10);
// 设置会话心跳时间
options.setKeepAliveInterval(20);
try {
client.setCallback(new PushCallBack());
client.connect(options);
topic = client.getTopic(TOPIC);
topic125 = client.getTopic(TOPIC125);
} catch (Exception e) {
e.printStackTrace();
}
}
publicvoid publish(MqttTopic topic, MqttMessage message)
throws MqttPersistenceException, MqttException {
MqttDeliveryToken token = topic.publish(message);
token.waitForCompletion();
System.out.println("message ispublished completely! "
+ token.isComplete());
}
publicstaticvoid main(String[] args) throws MqttException {
MqttServerTest server = new MqttServerTest();
server.message = new MqttMessage();
server.message.setQos(2);
server.message.setRetained(true);
server.message.setPayload("给客户端124推送的信息".getBytes());
server.publish(server.topic, server.message);
server.message = new MqttMessage();
server.message.setQos(2);
server.message.setRetained(true);
server.message.setPayload("给客户端125推送的信息".getBytes());
server.publish(server.topic125, server.message);
System.out.println(server.message.isRetained() + "------ratained状态");
}
}
importjava.util.concurrent.ScheduledExecutorService;
importorg.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
importorg.eclipse.paho.client.mqttv3.MqttException;
importorg.eclipse.paho.client.mqttv3.MqttTopic;
importorg.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
public class MqttClientTest {
publicstatic final String HOST = "tcp://127.0.0.1:61613";
publicstatic final String TOPIC = "toclient/124";
privatestatic final String clientid = "client124";
privateMqttClient client;
privateMqttConnectOptions options;
privateString userName = "admin";
privateString passWord = "password";
privateScheduledExecutorService scheduler;
privatevoid start() {
try{
//host为主机名，clientid即连接MQTT的客户端ID，一般以唯一标识符表示，MemoryPersistence设置clientid的保存形式，默认为以内存保存
client= new MqttClient(HOST, clientid, new MemoryPersistence());
//MQTT的连接设置
options= new MqttConnectOptions();
//设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录，这里设置为true表示每次连接到服务器都以新的身份连接
options.setCleanSession(true);
//设置连接的用户名
options.setUserName(userName);
//设置连接的密码
options.setPassword(passWord.toCharArray());
//设置超时时间 单位为秒
options.setConnectionTimeout(10);
//设置会话心跳时间 单位为秒 服务器会每隔1.5*20秒的时间向客户端发送个消息判断客户端是否在线，但这个方法并没有重连的机制
options.setKeepAliveInterval(20);
//设置回调
client.setCallback(newPushCallBack());
MqttTopictopic = client.getTopic(TOPIC);
//setWill方法，如果项目中需要知道客户端是否掉线可以调用该方法。设置最终端口的通知消息
options.setWill(topic,"close".getBytes(), 2, true);
client.connect(options);
//订阅消息
int[]Qos = { 1 };
String[]topic1 = { TOPIC };
client.subscribe(topic1,Qos);
}catch (Exception e) {
e.printStackTrace();
}
}
publicstatic void main(String[] args) throws MqttException {
MqttClientTestclient = new MqttClientTest();
client.start();
}
}
importorg.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
importorg.eclipse.paho.client.mqttv3.MqttCallback;
importorg.eclipse.paho.client.mqttv3.MqttMessage;
public class PushCallBack implementsMqttCallback{
publicvoid connectionLost(Throwable cause) {
//连接丢失后，一般在这里面进行重连
System.out.println("连接断开，可以做重连");
}
publicvoid deliveryComplete(IMqttDeliveryToken token) {
System.out.println("deliveryComplete---------"+ token.isComplete());
}
publicvoid messageArrived(String topic, MqttMessage message)
throwsException {
//subscribe后得到的消息会执行到这里面
System.out.println("接收消息主题 : " + topic);
System.out.println("接收消息Qos : " + message.getQos());
System.out.println("接收消息内容 : " + new String(message.getPayload()));
}
}
1. 客户端和服务端的demo代码中的userName和passWord为apollo服务器的登录账号和密码
2. Host地址根据自己所需要的连接方式选择
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