mqtt java客户端(eclipse paho)简单使用、调试记录
简单使用
v3客户端
Map<String,Integer> topics = new HashMap<String,Integer>();
MqttClient mqttClient = new MqttClient("tcp://192.168.0.2:1883",MqttClient.generateClientId());
MqttConnectOptions options = new MqttConnectOptions();
options.setAutomaticReconnect(true);
//该类型是重连重新订阅的必要类，使用普通Callback没有connectComplete方法
mqttClient.setCallback(new MqttCallbackExtended() {
@Override
public void connectComplete(boolean reconnect, String serverURI) {
System.out.println("连接成功");
if(reconnect){
topics.forEach((k,v)->{
try {
mqttClient.subscribe(k,v);
} catch (MqttException e) {
System.err.println(e.getMessage());
e.printStackTrace();
}
});
System.out.println("重连成功");
}
}
@Override
public void connectionLost(Throwable cause) {
System.out.println("连接丢失");
}
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
System.out.println("消息到达"+topic+":"+new String(message.getPayload()));
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
System.out.println("消息投递成功");
}
});
mqttClient.connect(options);
topics.put("test/003",1);
mqttClient.subscribe("test/003",1);
v5客户端
Map<String,Integer> topicsMap = new HashMap<>();
String serverURI = "tcp://192.168.0.2:1883";
String clientId = UUID.randomUUID().toString();
MqttClient client = new MqttClient(serverURI, clientId, new MemoryPersistence());
MqttConnectionOptions options = new MqttConnectionOptionsBuilder()
//自动重连，由于paho机制，需要在重连回调中重新订阅之前的topic
.automaticReconnect(true)
//遗嘱消息
// .will("/will",new MqttMessage(client.getClientId().getBytes()))
.connectionTimeout(10)
.cleanStart(false)
.keepAliveInterval(20)
.build();
client.connect(options);
//回调处理
client.setCallback(new MqttCallback() {
/**
* 断连回调
*/
@Override
public void disconnected(MqttDisconnectResponse disconnectResponse) {
System.out.println("Disconnected");
}
/**
* 异常发生回调
*/
@Override
public void mqttErrorOccurred(MqttException exception) {
System.out.println("mqttErrorOccurred");
}
/**
* 接收消息回调
*/
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
System.out.println("messageArrived");
}
/**
* 发送消息回调
*/
@Override
public void deliveryComplete(IMqttToken token) {
System.out.println("deliveryComplete");
}
/**
* 连接完成时回调
*/
@Override
public void connectComplete(boolean reconnect, String serverURI) {
// 连接完成时，重新订阅所有缓存的Topic
if (reconnect) {
topicsMap.forEach((topic, qos) -> {
try {
client.subscribe(topic, qos);
System.out.println("Resubscribed to topic: " + topic + " with QoS: " + qos);
} catch (MqttException e) {
System.err.println("Failed to resubscribe to topic: " + topic);
e.printStackTrace();
}
});
}
System.out.println("Connected to " + serverURI);
}
@Override
public void authPacketArrived(int reasonCode, MqttProperties properties) {
System.out.println("authPacketArrived");
}
});
topicsMap.put("test/001", 1);
topicsMap.put("test/002", 2);
client.subscribe(new MqttSubscription[]{new MqttSubscription("test/001")});
client.subscribe("test/002",2);
调试
在依赖中找到jsr47min.properties文件，将该文件复制到项目下，使用-Djava.util.logging.config.file=/xxx(绝对值路径)启动
修改日志级别以及将日志输出到console中：
# Properties file which configures the operation of the JDK logging facility.
#
# The configuration in this file is the suggesgted configuration
# for collecting trace for helping debug problems related to the
# Paho MQTT client. It configures trace to be continuosly collected
# in memory with minimal impact on performance.
#
# When the push trigger (by default a Severe level message) or a
# specific request is made to "push" the in memory trace then it
# is "pushed" to the configured target handler. By default
# this is the standard java.util.logging.FileHandler. The Paho Debug
# class can be used to push the memory trace to its target
#
# To enable trace either:
# - use this properties file as is and set the logging facility up
# to use it by configuring the util logging system property e.g.
#
# >java -Djava.util.logging.config.file=<location>\jsr47min.properties
#
# - This contents of this file can also be merged with another
# java.util.logging config file to ensure provide wider logging
# and trace including Paho trace
# Global logging properties.
# ------------------------------------------
# The set of handlers to be loaded upon startup.
# Comma-separated list of class names.
# - Root handlers are not enabled by default - just handlers on the Paho packages.
#handlers=java.util.logging.MemoryHandler,java.util.logging.FileHandler, java.util.logging.ConsoleHandler
# Default global logging level.
# Loggers and Handlers may override this level
# 设置日志级别 所有消息都打印
.level=ALL
# Loggers
# ------------------------------------------
# A memoryhandler is attached to the paho packages
# and the level specified to collected all trace related
# to paho packages. This will override any root/global
# level handlers if set.
org.eclipse.paho.mqttv5.client.handlers=java.util.logging.MemoryHandler
org.eclipse.paho.mqttv5.client.level=ALL
# It is possible to set more granular trace on a per class basis e.g.
#org.eclipse.paho.mqttv5.client.internal.ClientComms.level=ALL
# Handlers
# -----------------------------------------
# Note: the target handler that is associated with the MemoryHandler is not a root handler
# and hence not returned when getting the handlers from root. It appears accessing
# target handler programatically is not possible as target is a private variable in
# class MemoryHandler
java.util.logging.MemoryHandler.level=ALL
java.util.logging.MemoryHandler.size=10000
java.util.logging.MemoryHandler.push=ALL
#java.util.logging.MemoryHandler.target=java.util.logging.FileHandler
# 设置console输出
java.util.logging.MemoryHandler.target=java.util.logging.ConsoleHandler
#输出到文件
# --- FileHandler ---
# Override of global logging level
#java.util.logging.FileHandler.level=ALL
# Naming style for the output file:
# (The output file is placed in the directory
# defined by the "user.home" System property.)
# See java.util.logging for more options
#java.util.logging.FileHandler.pattern=%h/ibm/paho/trace/paho%u.log
#java.util.logging.FileHandler.pattern=logs/paho/trace/paho%u.log
# Limiting size of output file in bytes:
#java.util.logging.FileHandler.limit=200000
# Number of output files to cycle through, by appending an
# integer to the base file name:
#java.util.logging.FileHandler.count=3
# Style of output (Simple or XML):
#java.util.logging.FileHandler.formatter=org.eclipse.paho.mqttv5.client.logging.SimpleLogFormatter
# --- ConsoleHandler ---
# Override of global logging level
java.util.logging.ConsoleHandler.level=ALL
#java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter
# 日志格式化器
java.util.logging.ConsoleHandler.formatter=org.eclipse.paho.mqttv5.client.logging.SimpleLogFormatter
浙公网安备 33010602011771号