这篇文章我们看看JAVA 中 MQTT 的连接配置， 先看代码：
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* Copyright 2022 Pnoker All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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package com.ruoyi.project.business.controlcenter.iot.config;
import com.ruoyi.project.business.controlcenter.iot.util.IpUtil;
import lombok.extern.slf4j.Slf4j;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.annotation.IntegrationComponentScan;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.channel.DirectChannel;
import org.springframework.integration.mqtt.core.DefaultMqttPahoClientFactory;
import org.springframework.integration.mqtt.core.MqttPahoClientFactory;
import org.springframework.integration.mqtt.inbound.MqttPahoMessageDrivenChannelAdapter;
import org.springframework.integration.mqtt.outbound.MqttPahoMessageHandler;
import org.springframework.integration.mqtt.support.DefaultPahoMessageConverter;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;
import javax.annotation.Resource;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
/**
* @author pnoker
*/
@Slf4j
@Configuration
@IntegrationComponentScan(basePackages = "com.ruoyi.project.business.controlcenter.iot")
@EnableConfigurationProperties({MqttProperties.class})
public class MqttConfig {
private static final String RANDOM_ID = IpUtil.getOneLocalIP(); //CommonConstant.SYMBOL.UNDERSCORE + RandomUtil.randomString(8);
@Resource
private MqttProperties mqttProperties;
@Bean
public MessageChannel mqttInputChannel() {
return new DirectChannel();
}
@Bean
public MessageChannel mqttOutputChannel() {
return new DirectChannel();
}
/**
* MqttPahoMessageDrivenChannelAdapter 本质上是 MessageProducer
*/
@Bean
public MqttPahoMessageDrivenChannelAdapter messageProducer(MessageChannel mqttInputChannel) throws NoSuchAlgorithmException, InvalidKeyException {
String clientId = mqttProperties.getClient() + "_sub" + RANDOM_ID;
MqttPahoMessageDrivenChannelAdapter adapter =
new MqttPahoMessageDrivenChannelAdapter(
clientId, mqttClientFactory("_sub"));
log.info("mqtt-client-sub inited , clientId : {}...", clientId);
adapter.setQos(mqttProperties.getQos());
adapter.setOutputChannel(mqttInputChannel);
adapter.setConverter(new DefaultPahoMessageConverter());
adapter.setCompletionTimeout(mqttProperties.getCompletionTimeout());
return adapter;
}
// @Bean
// @ServiceActivator(inputChannel = "mqttInputChannel")
// public MessageHandler inputbound() {
// return new MqttReceiveHander();
// // TODO 先不做收消息
// return null;
// }
@Bean
@ServiceActivator(inputChannel = "mqttOutputChannel")
public MessageHandler outbound() throws NoSuchAlgorithmException, InvalidKeyException {
String client = mqttProperties.getClient() + "_pub" + RANDOM_ID;
MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(client, mqttClientFactory("_pub"));
messageHandler.setAsync(true);
log.info("mqtt-client-pub inited , clientId : {}...", client);
return messageHandler;
}
public MqttPahoClientFactory mqttClientFactory(String suffix) throws NoSuchAlgorithmException, InvalidKeyException {
DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
factory.setConnectionOptions(getMqttConnectOptions(suffix));
return factory;
}
public MqttConnectOptions getMqttConnectOptions(String suffix) throws NoSuchAlgorithmException, InvalidKeyException {
MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();
// username & password
if (mqttProperties.getAuthType().equals(MqttProperties.AuthTypeEnum.USERNAME)) {
mqttConnectOptions.setUserName(mqttProperties.getUsername());
mqttConnectOptions.setPassword(mqttProperties.getPassword().toCharArray());
} else if (mqttProperties.getAuthType().equals(MqttProperties.AuthTypeEnum.X509)) {
// tls x509
throw new IllegalArgumentException("暂不支持的认证方式");
} else if (mqttProperties.getAuthType().equals(MqttProperties.AuthTypeEnum.ALI)) {
ConnectionOptionWrapper connectionOptionWrapper = new ConnectionOptionWrapper(mqttProperties.getInstanceId(), mqttProperties.getAccessKey(), mqttProperties.getSecretKey(), mqttProperties.getClient() + suffix + RANDOM_ID);
mqttConnectOptions = connectionOptionWrapper.getMqttConnectOptions();
}
// disable https hostname verification
mqttConnectOptions.setHttpsHostnameVerificationEnabled(false);
mqttConnectOptions.setServerURIs(new String[]{mqttProperties.getUrl()});
mqttConnectOptions.setKeepAliveInterval(mqttProperties.getKeepAlive());
return mqttConnectOptions;
}
}这里比较重要的一个地方是 getMqttConnectOptions ， 它里面主要是根据你的 MQTT 的安全策略定制相应的连接策略， 运行的时候可以稍微注意下， 如果遇到连接不上报错的地方 ， 就要检查下MQTT 的安装策略是否匹配。
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