"# Java\u901a\u8fc7MQTT\u63a5\u5165\u793a\u4f8b\n\n> 2024-04-07 | 2024-04-07\n> https:\/\/www.modbus.cn\/en\/docs\/java-tong-guo-mqtt-jie-ru-shi-li\n\n---\n\n**\u8bf4\u660e\uff1a**\n\n\u672c\u6587\u4e2d\u4f7f\u7528\u7684\u4ee3\u7801\u4e3a\u6837\u4f8b\u4ee3\u7801\uff0c\u4ec5\u7528\u4e8e\u4f53\u9a8c\u5e73\u53f0\u901a\u4fe1\u529f\u80fd\uff0c\u5982\u9700\u8fdb\u884c\u5546\u7528\uff0c\u53ef\u4ee5\u53c2\u8003\u8d44\u6e90\u83b7\u53d6\u83b7\u53d6\u5bf9\u5e94\u8bed\u8a00\u7684IoT Device SDK\u8fdb\u884c\u96c6\u6210\u3002\n\n### \u524d\u63d0\u6761\u4ef6\n\n- \u5df2\u5728\u7ba1\u7406\u63a7\u5236\u53f0\u83b7\u53d6\u8bbe\u5907\u63a5\u5165\u5730\u5740\u3002\u83b7\u53d6\u5730\u5740\u7684\u64cd\u4f5c\u6b65\u9aa4\uff0c\u8bf7\u53c2\u8003\u5e73\u53f0\u5bf9\u63a5\u4fe1\u606f\u3002\n\n- \u5df2\u5728\u7ba1\u7406\u63a7\u5236\u53f0\u521b\u5efa\u4ea7\u54c1\u548c\u8bbe\u5907\u3002\u521b\u5efa\u4ea7\u54c1\u548c\u8bbe\u5907\u7684\u5177\u4f53\u64cd\u4f5c\u7ec6\u8282\uff0c\u8bf7\u53c2\u8003\u521b\u5efa\u4ea7\u54c1\u3001\u6ce8\u518c\u5355\u4e2a\u8bbe\u5907\u6216\u6279\u91cf\u6ce8\u518c\u8bbe\u5907\u3002\n\n### \u51c6\u5907\u5de5\u4f5c\n\n\u5b89\u88c5**IntelliJ IDEA**\n\n- \u8bbf\u95ee[IntelliJ IDEA\u5b98\u7f51](https:\/\/www.jetbrains.com\/idea\/)\uff0c\u9009\u62e9\u5408\u9002\u7cfb\u7edf\u7684\u7248\u672c\u4e0b\u8f7d\u3002\uff08\u672c\u6587\u4ee5windows 64-bit\u7cfb\u7edfIntelliJ IDEA 2019.2.3 Ultimate\u4e3a\u4f8b\uff09\u3002\n\n- \u4e0b\u8f7d\u5b8c\u6210\u540e\uff0c\u8fd0\u884c\u5b89\u88c5\u6587\u4ef6\uff0c\u6839\u636e\u754c\u9762\u63d0\u793a\u5b89\u88c5\u3002\n\n#### \u5bfc\u5165\u4ee3\u7801\u6837\u4f8b\n\n- \u4e0b\u8f7dJAVA\u6837\u4f8b\u3002\n\n\u94fe\u63a5\uff1a[https:\/\/pan.baidu.com\/s\/1JtQsONuIX8y7r0VpIepA5w?pwd=zne7](https:\/\/pan.baidu.com\/s\/1JtQsONuIX8y7r0VpIepA5w?pwd=zne7)\n\n\u63d0\u53d6\u7801\uff1azne7\n\n- \u6253\u5f00IDEA\u5f00\u53d1\u8005\u5de5\u5177\uff0c\u5355\u51fb\u201c Import Project\u201d\u3002\n\n- \u9009\u62e9\u6b65\u9aa4[1](https:\/\/support.huaweicloud.com\/devg-iothub\/iot_02_2128.html#ZH-CN_TOPIC_0240834905__li111122321211)\u4e2d\u4e0b\u8f7d\u7684\u6837\u4f8b\uff0c\u7136\u540e\u6839\u636e\u754c\u9762\u63d0\u793a\uff0c\u5355\u51fb\u201cnext\u201d\u3002\n\n- \u5b8c\u6210\u4ee3\u7801\u5bfc\u5165\u3002\n\n#### \u5efa\u7acb\u8fde\u63a5\n\n\u8bbe\u5907\u6216\u7f51\u5173\u5728\u63a5\u5165\u7269\u8054\u7f51\u5e73\u53f0\u65f6\u9996\u5148\u9700\u8981\u548c\u5e73\u53f0\u5efa\u7acb\u8fde\u63a5\uff0c\u4ece\u800c\u5c06\u8bbe\u5907\u6216\u7f51\u5173\u4e0e\u5e73\u53f0\u8fdb\u884c\u5173\u8054\u3002\u5f00\u53d1\u8005\u901a\u8fc7\u4f20\u5165\u8bbe\u5907\u4fe1\u606f\uff0c\u5c06\u8bbe\u5907\u6216\u7f51\u5173\u8fde\u63a5\u5230\u7269\u8054\u7f51\u5e73\u53f0\u3002\n\nMQTT\u57fa\u672c\u4fe1\u606f\n\n**Topic****\u6743\u9650****\u8bf4\u660e**Broker Addressiot.modbus.cnMQTT\u5730\u5740Broker Port1883MQTT\u7aef\u53e3\u53f7Client ID4QR8TZ9ThuL4G\u8bbe\u5907\u53f7SN(\u8bf7\u66ff\u6362\u4e3a\u81ea\u5df1\u7684\uff09\n\nMQTT\u8d26\u53f7\u5bc6\u7801\n\n**Topic****\u6743\u9650****\u8bf4\u660e**User Nameceshi\u7528\u6237\u8d26\u6237Password123456\u7528\u6237\u5bc6\u7801\n\n- \u5728\u5efa\u7acb\u8fde\u63a5\u4e4b\u524d\uff0c\u5148\u4fee\u6539\u4ee5\u4e0b\u53c2\u6570\uff1a\n\n```\n\/\/ MQTT \u670d\u52a1\u5668\u5730\u5740\nprivate static final String MQTT_BROKER = "tcp:\/\/iot.modbus.cn:1883"; MQTT\u5730\u5740\/\u7aef\u53e3\u53f7\n\n\/\/ MQTT \u5ba2\u6237\u7aef ID\nprivate static final String MQTT_CLIENT_ID = "4QR8TZ9ThuL4G";  \/\/\u8bbe\u5907\u53f7SN\u7801\n\n\/\/ MQTT \u7528\u6237\u540d\nprivate static final String MQTT_USERNAME = "ceshi";\n\n\/\/ MQTT \u5bc6\u7801\nprivate static final String MQTT_PASSWORD = "Abc123456";\n\n\/\/ \u8ba2\u9605\u7684\u4e3b\u9898\nprivate static final String MQTT_TOPIC_SUBSCRIBE = "\/server\/coo\/4QR8TZ9ThuL4G";\n\n\/\/ \u53d1\u5e03\u7684\u4e3b\u9898\nprivate static final String MQTT_TOPIC_PUBLISH = "\/dev\/coo\/4QR8TZ9ThuL4G";\n```\n\n- MQTT_BROKER\u4e3a\u7269\u8054\u7f51\u5e73\u53f0\u7684\u8bbe\u5907\u5bf9\u63a5\u5730\u5740\uff0c\u53ef\u53c2\u8003\u5e73\u53f0\u5bf9\u63a5\u4fe1\u606f\u83b7\u53d6\uff08\u83b7\u53d6\u7684\u662f\u57df\u540d\u4fe1\u606f\uff0c\u53ef\u901a\u8fc7\u5728cmd\u547d\u4ee4\u6846\u4e2d\u6267\u884c\u201cping \u57df\u540d\u201d\uff0c\u83b7\u53d6IP\u5730\u5740\uff09\u3002\n\n- MQTT_CLIENT_ID\u4e3a\u8bbe\u5907\u53f7SN\uff0c\u5728\u6210\u529f\u6dfb\u52a0\u8bbe\u5907\u540e\u83b7\u53d6\u3002\n\n- \u4fee\u6539\u5b8c1\u4e2d\u7684\u53c2\u6570\u540e\u5c31\u53ef\u4f7f\u7528MqttClient\u5efa\u7acb\u8fde\u63a5\u4e86\u3002\n\n- \u8fde\u63a5\u6210\u529f\u540e\uff0c\u8bbe\u5907\u663e\u793a\u5728\u7ebf\u3002\n\n\u5907\u6ce8\uff1a\u4ece\u8bbe\u5907\u5730\u5740\u662fsensor_device_id \uff0c\u5bc4\u5b58\u5668\u662fport_id\uff0c\u6570\u636e\u6570\u503c\u662fSdata \uff0c\u5177\u4f53\u7a0d\u540e\u6709\u5177\u4f53\u8bf4\u660e\u3002\n\n\u4f7f\u7528MQTT\u901a\u8baf\u534f\u8bae\uff0c\u4e0b\u9762\u7684\u5c5e\u6027\u540d\u79f0\uff0cModbus\u529f\u80fd\u7801\uff0c\u6570\u636e\u683c\u5f0f\uff0c\u6570\u636e\u987a\u5e8f\u4e0d\u4f1a\u5f71\u54cd\u6700\u7ec8\u6570\u636e\uff0c\u968f\u4fbf\u9009\u62e9\u5c31\u53ef\u4ee5!\n\n## MQTT \u4e3b\u9898\u4e00\u89c8\n\nModbus\u7269\u8054\u7f51\u5e73\u53f0 \u4f5c\u4e3a\u7269\u8054\u7f51 PaaS \u4e91\u5e73\u53f0\uff0c\u5bf9\u8bbe\u5907 MQTT \u63a5\u5165\u63d0\u4f9b\u4e86\u5185\u7f6e\u7684\u8bbf\u95ee\u534f\u8bae\u89c4\u8303\uff0c\u8ba9\u8bbe\u5907\u548c\u4e91\u5e73\u53f0\u7684\u6d88\u606f\u901a\u4fe1\u66f4\u52a0\u6709\u7ae0\u53ef\u5faa\uff0c\u5927\u5927\u7b80\u5316\u4e86\u7269\u8054\u7f51\u9879\u76ee\u7684\u5f00\u53d1\u96be\u5ea6\uff0c\u7f29\u77ed\u4e86\u4ea7\u54c1\u7684\u5f00\u53d1\u5468\u671f\u3002\n\n\u4e0d\u540c\u4e8e\u666e\u901a\u7684 MQTT \u4f7f\u7528\u65b9\u5f0f\uff0c\u6211\u4eec\u63d0\u4f9b\u4e86\u6807\u51c6\u7684\u5185\u7f6e\u4e3b\u9898\uff0c\u8fd9\u8db3\u4ee5\u5b9e\u73b0\u7edd\u5927\u591a\u6570\u7684\u7269\u8054\u7f51\u5e94\u7528\u573a\u666f\u3002\n\n**Topic****\u6743\u9650****\u8bf4\u660e**\/dev\/coo\/4QR8TZ9ThuL4G**\u53d1\u5e03**\u4e0a\u884c\u901a\u4fe1\uff1a\u8bbe\u5907\u901a\u8fc7\u8be5Topic\u5411\u7269\u8054\u7f51\u5e73\u53f0\u53d1\u9001\u6d88\u606f\u3002\/server\/coo\/4QR8TZ9ThuL4G**\u8ba2\u9605**\u4e0b\u884c\u901a\u4fe1\uff1a\u8bbe\u5907\u901a\u8fc7\u8ba2\u9605\u8be5Topic\uff0c\u83b7\u53d6\u4ece\u7269\u8054\u7f51\u5e73\u53f0\u4e0b\u53d1\u7684\u6d88\u606f\u3002\n\n4QR8TZ9ThuL4G\u4e3a\u793a\u4f8b\u8bbe\u5907\u53f7SN\uff0c\u8bf7\u66ff\u6362\u4e3a\u81ea\u5df1\u7684\uff01\n\n### **\u4e0a\u884c\u901a\u4fe1**\n\nTopic\uff1a**\/dev\/coo\/**4QR8TZ9ThuL4G \u8bbe\u5907\u53f7SN(\u8bf7\u66ff\u6362\u4e3a\u81ea\u5df1\u7684\uff09\n\n```\n        \/\/ \u8fde\u63a5\u5230 MQTT \u670d\u52a1\u5668\n        mqttClient.connect(options);\n\n        \/\/ \u8ba2\u9605\u4e3b\u9898\n        mqttClient.subscribe(MQTT_TOPIC_SUBSCRIBE);\n\n        \/\/ \u521b\u5efa\u6d88\u606f\n        MqttMessage message = new MqttMessage();\n        message.setPayload("[{"sensor_device_id": 1, "port_id": 1, "sdata": 66}]".getBytes());\n\n        \/\/ \u53d1\u5e03\u6d88\u606f\n        mqttClient.publish(MQTT_TOPIC_PUBLISH, message);\n```\n\n\u5907\u6ce8\uff1a\u4ece\u8bbe\u5907\u5730\u5740\u662fsensor_device_id \uff0c\u5bc4\u5b58\u5668\u662fport_id\uff0c\u6570\u636e\u6570\u503c\u662fSdata\n\n### **\u4e0b\u884c\u901a\u4fe1**\n\nTopic\uff1a**\/server\/coo\/**4QR8TZ9ThuL4G \u8bbe\u5907\u53f7SN(\u8bf7\u66ff\u6362\u4e3a\u81ea\u5df1\u7684\uff09\n\n```\nSystem.out.println("\u8bbe\u5907ID: " + sensor_device_id + ", \u7aef\u53e3ID: " + port_id + ", \u6570\u636e: " + sdata);\n```\n\n\u5907\u6ce8\uff1a\u4ece\u8bbe\u5907\u5730\u5740\u662fsensor_device_id \uff0c\u5bc4\u5b58\u5668\u662fport_id\uff0c\u6570\u636e\u6570\u503c\u662fSdata\n\n## \u5b8c\u6574\u4ee3\u7801\uff1a\n\n```\nimport org.eclipse.paho.client.mqttv3.*;\nimport org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;\nimport org.json.JSONArray;\nimport org.json.JSONObject;\n\npublic class MqttDemo {\n    \/\/ MQTT \u670d\u52a1\u5668\u5730\u5740\n    private static final String MQTT_BROKER = "tcp:\/\/iot.modbus.cn:1883";\n\n    \/\/ MQTT \u5ba2\u6237\u7aef ID\n    private static final String MQTT_CLIENT_ID = "4QR8TZ9ThuL4G";\n\n    \/\/ MQTT \u7528\u6237\u540d\n    private static final String MQTT_USERNAME = "ceshi";\n\n    \/\/ MQTT \u5bc6\u7801\n    private static final String MQTT_PASSWORD = "Abc123456";\n\n    \/\/ \u8ba2\u9605\u7684\u4e3b\u9898\n    private static final String MQTT_TOPIC_SUBSCRIBE = "\/server\/coo\/4QR8TZ9ThuL4G";\n\n    \/\/ \u53d1\u5e03\u7684\u4e3b\u9898\n    private static final String MQTT_TOPIC_PUBLISH = "\/dev\/coo\/4QR8TZ9ThuL4G";\n\n    \/\/ \u5fc3\u8df3\u95f4\u9694\uff0c\u5355\u4f4d\u4e3a\u79d2\n    private static final int MQTT_KEEP_ALIVE_INTERVAL = 60;\n\n    public static void main(String[] args) throws MqttException {\n        \/\/ \u521b\u5efa MQTT \u5ba2\u6237\u7aef\n        MqttClient mqttClient = new MqttClient(MQTT_BROKER, MQTT_CLIENT_ID, new MemoryPersistence());\n\n        \/\/ \u8bbe\u7f6e MQTT \u8fde\u63a5\u9009\u9879\n        MqttConnectOptions options = new MqttConnectOptions();\n        options.setUserName(MQTT_USERNAME);\n        options.setPassword(MQTT_PASSWORD.toCharArray());\n        options.setCleanSession(true);\n        options.setKeepAliveInterval(MQTT_KEEP_ALIVE_INTERVAL);\n\n        \/\/ \u8bbe\u7f6e\u56de\u8c03\n        mqttClient.setCallback(new MqttCallback() {\n            @Override\n            public void connectionLost(Throwable cause) {\n                System.out.println("\u8fde\u63a5\u65ad\u5f00");\n            }\n\n            @Override\n            public void messageArrived(String topic, MqttMessage message) throws Exception {\n                System.out.println("\u6536\u5230\u6d88\u606f\u3002\u4e3b\u9898: " + topic);\n                System.out.println("\u6d88\u606f: " + new String(message.getPayload()));\n\n                \/\/ \u5c06\u6d88\u606f\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\n                String msg = new String(message.getPayload());\n\n                \/\/ \u4f7f\u7528 JSON \u5de5\u5177\u89e3\u6790\u5b57\u7b26\u4e32\n                JSONArray jsonArray = new JSONArray(msg);\n\n                for (int i = 0; i < jsonArray.length(); i++) {\n                    JSONObject jsonObject = jsonArray.getJSONObject(i);\n                    int sensor_device_id = jsonObject.getInt("sensor_device_id");\n                    int port_id = jsonObject.getInt("port_id");\n                    int sdata = jsonObject.getInt("sdata");\n\n                    \/\/ \u5728\u8fd9\u91cc\u4f60\u53ef\u4ee5\u5904\u7406\u63a5\u6536\u5230\u7684\u6570\u636e\n                    System.out.println("\u8bbe\u5907ID: " + sensor_device_id + ", \u7aef\u53e3ID: " + port_id + ", \u6570\u636e: " + sdata);\n                }\n            }\n\n            @Override\n            public void deliveryComplete(IMqttDeliveryToken token) {\n                System.out.println("\u6d88\u606f\u53d1\u5e03\u5b8c\u6210");\n            }\n        });\n\n        \/\/ \u8fde\u63a5\u5230 MQTT \u670d\u52a1\u5668\n        mqttClient.connect(options);\n\n        \/\/ \u8ba2\u9605\u4e3b\u9898\n        mqttClient.subscribe(MQTT_TOPIC_SUBSCRIBE);\n\n        \/\/ \u521b\u5efa\u6d88\u606f\n        MqttMessage message = new MqttMessage();\n        message.setPayload("[{"sensor_device_id": 1, "port_id": 1, "sdata": 66}]".getBytes());\n\n        \/\/ \u53d1\u5e03\u6d88\u606f\n        mqttClient.publish(MQTT_TOPIC_PUBLISH, message);\n    }\n}\n\n```\n\n---\n*modbus.cn*\n"