TopClient.java

import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
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.MqttMessage;
import org.eclipse.paho.client.mqttv3.MqttTopic;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;

public class TopClient extends JFrame {
	private static final long serialVersionUID = 1L;
	private JPanel panel;
	private JButton button;

	private MqttClient client;
	private String host = "tcp://192.168.21.202:1883";
	// private String host = "tcp://localhost:1883";
	/*private String userName = "dk";
	private String passWord = "dk123";*/
	private MqttTopic topic;
	private MqttMessage message;

	private String myTopic = "test/#";
	private JTextField jf;
	public TopClient() {
		this.setTitle("top"+"==="+myTopic);
		try {
			client = new MqttClient(host, "top", new MemoryPersistence());
			connect();
		} catch (Exception e) {
			e.printStackTrace();
		}

		Container container = this.getContentPane();
		panel = new JPanel();
		button = new JButton("subscribe the topic");
		button.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent ae) {
				try {
					/*MqttDeliveryToken token = topic.publish(message);
					token.waitForCompletion();
					System.out.println(token.isComplete() + "========");*/
					 client.subscribe(myTopic,2);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
		panel.add(button);
		  jf = new JTextField();
		panel.add(jf);
		jf.setText("ww33333333333333333");
		container.add(panel, "North");

	}

	private void connect() {

		MqttConnectOptions options = new MqttConnectOptions();
		options.setCleanSession(false);
		/*options.setUserName(userName);
		options.setPassword(passWord.toCharArray());*/
		// ���ó�ʱʱ��
		options.setConnectionTimeout(10);
		// ���ûỰ����ʱ��
		options.setKeepAliveInterval(20);
		try {
			client.setCallback(new MqttCallback() {

				@Override
				public void connectionLost(Throwable cause) {
					System.out.println("connectionLost-----------");
				}

				@Override
				public void deliveryComplete(IMqttDeliveryToken token) {
					System.out.println("deliveryComplete---------"
							+ token.isComplete());
				}

				@Override
				public void messageArrived(String topic, MqttMessage arg1)
						throws Exception {
					System.out.println("messageArrived----------"+arg1.toString());
					jf.setText(new String(arg1.toString().getBytes("GBK")));

				}
			});

			//topic = client.getTopic(myTopic);

			/*message = new MqttMessage();
			message.setQos(1);
			message.setRetained(false);
			System.out.println(message.isRetained() + "------ratained״̬");
			message.setPayload("��������������33".getBytes("UTF-8"));*/

			client.connect(options);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	public static void main(String[] args) {
		TopClient s = new TopClient();
		s.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		s.setSize(600, 370);
		s.setLocationRelativeTo(null);
		s.setVisible(true);
	}
}