MQTT客户端--基于paho实现（Java）

其他 2018-07-09 09:38:17 阅读次数: 0


2017年04月25日 10:33:16
阅读数：1356

订阅类：

  1. <!--lang:java-->
  2. package org.chisj.mqtt;
  4. import java.util.concurrent.Executors;
  5. import java.util.concurrent.ScheduledExecutorService;
  6. import java.util.concurrent.TimeUnit;
  8. import org.eclipse.paho.client.mqttv3.MqttClient;
  9. import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
  10. import org.eclipse.paho.client.mqttv3.MqttException;
  11. import org.eclipse.paho.client.mqttv3.MqttSecurityException;
  12. import org.eclipse.paho.client.mqttv3.MqttTopic;
  13. import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
  15. public class Client {
  17. //public static final String HOST = "tcp://0.0.0.0:61613";
  18. public static final String HOST = "tcp://192.168.1.100:1883";
  19. public static final String TOPIC = "webServer";
  20. private static final String clientid = "client124";
  21. private MqttClient client;
  22. private MqttConnectOptions options;
  23. private String userName = "admin";
  24. private String passWord = "password";
  26. private ScheduledExecutorService scheduler;
  28. private void start() {
  29. try {
  30. // 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
  31. client = new MqttClient(HOST, clientid, new MemoryPersistence());
  32. // MQTT的连接设置
  33. options = new MqttConnectOptions();
  34. // 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
  35. options.setCleanSession( true);
  36. // 设置连接的用户名
  37. options.setUserName(userName);
  38. // 设置连接的密码
  39. options.setPassword(passWord.toCharArray());
  40. // 设置超时时间 单位为秒
  41. options.setConnectionTimeout( 10);
  42. // 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
  43. options.setKeepAliveInterval( 20);
  44. // 设置回调
  45. client.setCallback( new PushCallback());
  46. MqttTopic topic = client.getTopic(TOPIC);
  47. //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
  48. //options.setWill(topic, "close".getBytes(), 2, true);
  50. client.connect(options);
  51. //订阅消息
  52. int[] Qos = { 1};
  53. String[] topic1 = {TOPIC};
  54. client.subscribe(topic1, Qos);
  56. } catch (Exception e) {
  57. e.printStackTrace();
  58. }
  59. }
  61. public static void main(String[] args) throws MqttException {
  62. Client client = new Client();
  63. client.start();
  64. }
  65. }

发布类：

  1. /**
  2. * @Title: Server.java
  3. * @Package org.chisj.mqtt
  4. * @Description: TODO
  5. * @author chisj [email protected]
  6. * @date 2017年4月1日
  7. */
  8. package org.chisj.mqtt;
  10. import org.eclipse.paho.client.mqttv3.MqttClient;
  11. import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
  12. import org.eclipse.paho.client.mqttv3.MqttDeliveryToken;
  13. import org.eclipse.paho.client.mqttv3.MqttException;
  14. import org.eclipse.paho.client.mqttv3.MqttMessage;
  15. import org.eclipse.paho.client.mqttv3.MqttPersistenceException;
  16. import org.eclipse.paho.client.mqttv3.MqttTopic;
  17. import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
  19. /**
  20. * ClassName: Server
  21. * @Description: TODO
  22. * @author chisj [email protected]
  23. * @date 2017年4月1日
  24. */
  25. public class Server {
  27. //public static final String HOST = "tcp://0.0.0.0:61613";tcp://192.168.1.100:1883
  28. public static final String HOST = "tcp://192.168.1.100:1883";
  29. public static final String TOPIC = "webServer";
  30. public static final String TOPIC125 = "toclient/125";
  31. private static final String clientid = "server";
  33. private MqttClient client;
  34. private MqttTopic topic;
  35. private MqttTopic topic125;
  36. private String userName = "admin";
  37. private String passWord = "password";
  39. private MqttMessage message;
  41. public Server() throws MqttException {
  42. // MemoryPersistence设置clientid的保存形式，默认为以内存保存
  43. client = new MqttClient(HOST, clientid, new MemoryPersistence());
  44. connect();
  45. }
  47. private void connect() {
  48. MqttConnectOptions options = new MqttConnectOptions();
  49. options.setCleanSession( false);
  50. options.setUserName(userName);
  51. options.setPassword(passWord.toCharArray());
  52. // 设置超时时间
  53. options.setConnectionTimeout( 10);
  54. // 设置会话心跳时间
  55. options.setKeepAliveInterval( 20);
  56. try {
  57. client.setCallback( new PushCallback());
  58. client.connect(options);
  59. topic = client.getTopic(TOPIC);
  60. topic125 = client.getTopic(TOPIC125);
  61. } catch (Exception e) {
  62. e.printStackTrace();
  63. }
  64. }
  66. public void publish(MqttTopic topic , MqttMessage message) throws MqttPersistenceException,
  67. MqttException {
  68. MqttDeliveryToken token = topic.publish(message);
  69. token.waitForCompletion();
  70. System.out.println( "message is published completely! "
  71. + token.isComplete());
  72. }
  74. public static void main(String[] args) throws MqttException {
  75. Server server = new Server();
  77. server.message = new MqttMessage();
  78. server.message.setQos( 2);
  79. server.message.setRetained( true);
  80. server.message.setPayload( "给客户端124推送的信息".getBytes());
  81. server.publish(server.topic , server.message);
  83. server.message = new MqttMessage();
  84. server.message.setQos(2);
  85. server.message.setRetained(true);
  86. server.message.setPayload("给客户端125推送的信息".getBytes());
  87. server.publish(server.topic125 , server.message);
  89. System.out.println(server.message.isRetained() + "------ratained状态");
  91. }
  92. }

回调类：

  1. /**
  2. * @Title: PushCallback.java
  3. * @Package org.chisj.mqtt
  4. * @Description: TODO
  5. * @author chisj [email protected]
  6. * @date 2017年4月1日
  7. */
  8. package org.chisj.mqtt;
  10. import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
  11. import org.eclipse.paho.client.mqttv3.MqttCallback;
  12. import org.eclipse.paho.client.mqttv3.MqttMessage;
  14. /**
  15. * 发布消息的回调类
  16. *
  17. * 必须实现MqttCallback的接口并实现对应的相关接口方法CallBack 类将实现 MqttCallBack。
  18. * 每个客户机标识都需要一个回调实例。在此示例中，构造函数传递客户机标识以另存为实例数据。
  19. * 在回调中，将它用来标识已经启动了该回调的哪个实例。
  20. * 必须在回调类中实现三个方法：
  21. *
  22. * public void messageArrived(MqttTopic topic, MqttMessage message)接收已经预订的发布。
  23. *
  24. * public void connectionLost(Throwable cause)在断开连接时调用。
  25. *
  26. * public void deliveryComplete(MqttDeliveryToken token))
  27. * 接收到已经发布的 QoS 1 或 QoS 2 消息的传递令牌时调用。
  28. * 由 MqttClient.connect 激活此回调。
  29. *
  30. */
  31. public class PushCallback implements MqttCallback {
  33. public void connectionLost(Throwable cause) {
  34. // 连接丢失后，一般在这里面进行重连
  35. System.out.println( "连接断开，可以做重连");
  36. }
  38. public void deliveryComplete(IMqttDeliveryToken token) {
  39. System.out.println( "deliveryComplete---------" + token.isComplete());
  40. }
  42. public void messageArrived(String topic, MqttMessage message) throws Exception {
  43. // subscribe后得到的消息会执行到这里面
  44. System.out.println( "接收消息主题 : " + topic);
  45. System.out.println( "接收消息Qos : " + message.getQos());
  46. System.out.println( "接收消息内容 : " + new String(message.getPayload()));
  47. }
  48. }
运行结果：



订阅类：

  1. <!--lang:java-->
  2. package org.chisj.mqtt;
  4. import java.util.concurrent.Executors;
  5. import java.util.concurrent.ScheduledExecutorService;
  6. import java.util.concurrent.TimeUnit;
  8. import org.eclipse.paho.client.mqttv3.MqttClient;
  9. import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
  10. import org.eclipse.paho.client.mqttv3.MqttException;
  11. import org.eclipse.paho.client.mqttv3.MqttSecurityException;
  12. import org.eclipse.paho.client.mqttv3.MqttTopic;
  13. import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
  15. public class Client {
  17. //public static final String HOST = "tcp://0.0.0.0:61613";
  18. public static final String HOST = "tcp://192.168.1.100:1883";
  19. public static final String TOPIC = "webServer";
  20. private static final String clientid = "client124";
  21. private MqttClient client;
  22. private MqttConnectOptions options;
  23. private String userName = "admin";
  24. private String passWord = "password";
  26. private ScheduledExecutorService scheduler;
  28. private void start() {
  29. try {
  30. // 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
  31. client = new MqttClient(HOST, clientid, new MemoryPersistence());
  32. // MQTT的连接设置
  33. options = new MqttConnectOptions();
  34. // 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
  35. options.setCleanSession( true);
  36. // 设置连接的用户名
  37. options.setUserName(userName);
  38. // 设置连接的密码
  39. options.setPassword(passWord.toCharArray());
  40. // 设置超时时间 单位为秒
  41. options.setConnectionTimeout( 10);
  42. // 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
  43. options.setKeepAliveInterval( 20);
  44. // 设置回调
  45. client.setCallback( new PushCallback());
  46. MqttTopic topic = client.getTopic(TOPIC);
  47. //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
  48. //options.setWill(topic, "close".getBytes(), 2, true);
  50. client.connect(options);
  51. //订阅消息
  52. int[] Qos = { 1};
  53. String[] topic1 = {TOPIC};
  54. client.subscribe(topic1, Qos);
  56. } catch (Exception e) {
  57. e.printStackTrace();
  58. }
  59. }
  61. public static void main(String[] args) throws MqttException {
  62. Client client = new Client();
  63. client.start();
  64. }
  65. }

发布类：

  1. /**
  2. * @Title: Server.java
  3. * @Package org.chisj.mqtt
  4. * @Description: TODO
  5. * @author chisj [email protected]
  6. * @date 2017年4月1日
  7. */
  8. package org.chisj.mqtt;
  10. import org.eclipse.paho.client.mqttv3.MqttClient;
  11. import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
  12. import org.eclipse.paho.client.mqttv3.MqttDeliveryToken;
  13. import org.eclipse.paho.client.mqttv3.MqttException;
  14. import org.eclipse.paho.client.mqttv3.MqttMessage;
  15. import org.eclipse.paho.client.mqttv3.MqttPersistenceException;
  16. import org.eclipse.paho.client.mqttv3.MqttTopic;
  17. import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
  19. /**
  20. * ClassName: Server
  21. * @Description: TODO
  22. * @author chisj [email protected]
  23. * @date 2017年4月1日
  24. */
  25. public class Server {
  27. //public static final String HOST = "tcp://0.0.0.0:61613";tcp://192.168.1.100:1883
  28. public static final String HOST = "tcp://192.168.1.100:1883";
  29. public static final String TOPIC = "webServer";
  30. public static final String TOPIC125 = "toclient/125";
  31. private static final String clientid = "server";
  33. private MqttClient client;
  34. private MqttTopic topic;
  35. private MqttTopic topic125;
  36. private String userName = "admin";
  37. private String passWord = "password";
  39. private MqttMessage message;
  41. public Server() throws MqttException {
  42. // MemoryPersistence设置clientid的保存形式，默认为以内存保存
  43. client = new MqttClient(HOST, clientid, new MemoryPersistence());
  44. connect();
  45. }
  47. private void connect() {
  48. MqttConnectOptions options = new MqttConnectOptions();
  49. options.setCleanSession( false);
  50. options.setUserName(userName);
  51. options.setPassword(passWord.toCharArray());
  52. // 设置超时时间
  53. options.setConnectionTimeout( 10);
  54. // 设置会话心跳时间
  55. options.setKeepAliveInterval( 20);
  56. try {
  57. client.setCallback( new PushCallback());
  58. client.connect(options);
  59. topic = client.getTopic(TOPIC);
  60. topic125 = client.getTopic(TOPIC125);
  61. } catch (Exception e) {
  62. e.printStackTrace();
  63. }
  64. }
  66. public void publish(MqttTopic topic , MqttMessage message) throws MqttPersistenceException,
  67. MqttException {
  68. MqttDeliveryToken token = topic.publish(message);
  69. token.waitForCompletion();
  70. System.out.println( "message is published completely! "
  71. + token.isComplete());
  72. }
  74. public static void main(String[] args) throws MqttException {
  75. Server server = new Server();
  77. server.message = new MqttMessage();
  78. server.message.setQos( 2);
  79. server.message.setRetained( true);
  80. server.message.setPayload( "给客户端124推送的信息".getBytes());
  81. server.publish(server.topic , server.message);
  83. server.message = new MqttMessage();
  84. server.message.setQos(2);
  85. server.message.setRetained(true);
  86. server.message.setPayload("给客户端125推送的信息".getBytes());
  87. server.publish(server.topic125 , server.message);
  89. System.out.println(server.message.isRetained() + "------ratained状态");
  91. }
  92. }

回调类：

  1. /**
  2. * @Title: PushCallback.java
  3. * @Package org.chisj.mqtt
  4. * @Description: TODO
  5. * @author chisj [email protected]
  6. * @date 2017年4月1日
  7. */
  8. package org.chisj.mqtt;
  10. import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
  11. import org.eclipse.paho.client.mqttv3.MqttCallback;
  12. import org.eclipse.paho.client.mqttv3.MqttMessage;
  14. /**
  15. * 发布消息的回调类
  16. *
  17. * 必须实现MqttCallback的接口并实现对应的相关接口方法CallBack 类将实现 MqttCallBack。
  18. * 每个客户机标识都需要一个回调实例。在此示例中，构造函数传递客户机标识以另存为实例数据。
  19. * 在回调中，将它用来标识已经启动了该回调的哪个实例。
  20. * 必须在回调类中实现三个方法：
  21. *
  22. * public void messageArrived(MqttTopic topic, MqttMessage message)接收已经预订的发布。
  23. *
  24. * public void connectionLost(Throwable cause)在断开连接时调用。
  25. *
  26. * public void deliveryComplete(MqttDeliveryToken token))
  27. * 接收到已经发布的 QoS 1 或 QoS 2 消息的传递令牌时调用。
  28. * 由 MqttClient.connect 激活此回调。
  29. *
  30. */
  31. public class PushCallback implements MqttCallback {
  33. public void connectionLost(Throwable cause) {
  34. // 连接丢失后，一般在这里面进行重连
  35. System.out.println( "连接断开，可以做重连");
  36. }
  38. public void deliveryComplete(IMqttDeliveryToken token) {
  39. System.out.println( "deliveryComplete---------" + token.isComplete());
  40. }
  42. public void messageArrived(String topic, MqttMessage message) throws Exception {
  43. // subscribe后得到的消息会执行到这里面
  44. System.out.println( "接收消息主题 : " + topic);
  45. System.out.println( "接收消息Qos : " + message.getQos());
  46. System.out.println( "接收消息内容 : " + new String(message.getPayload()));
  47. }
  48. }
运行结果：



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