其目标就是将MQTT用在项目组中
接着就是项目yml文件的配置，使用properties，以葫芦画瓢就行了：
applicaiton.yml
mqtt:
username: admin
password: password
host-url: tcp://127.0.0.1:8161 # 你自己服务器的地址和端口，这个需要改
clientID: test1 # 这个改不改随意，但不同的客户端肯定不能一样
default-topic: home/garden/fountain # 默认主题
timeout: 100
keepalive: 100
# Tomcat
server:
tomcat:
uri-encoding: UTF-8
max-threads: 1000
min-spare-threads: 30
port: 8088
注意host-url，这就是你apollo的地址
来到第三步，此时就是项目内的文件：
MqttConfig文件
@Component
@ConfigurationProperties("mqtt")
@Setter
@Getter
public class MqttConfig {
@Autowired
private MqttPushClient mqttPushClient;
/**
* 用户名
*/
// @Value("username")
private String username;
/**
* 密码
*/
private String password;
/**
* 连接地址
*/
private String hostUrl;
/**
* 客户Id
*/
private String clientID;
/**
* 默认连接话题
*/
private String defaultTopic;
/**
* 超时时间
*/
private int timeout;
/**
* 保持连接数
*/
private int keepalive;
@Bean
public MqttPushClient getMqttPushClient() {
System.out.println("hostUrl: "+ hostUrl);
System.out.println("clientID: "+ clientID);
System.out.println("username: "+ username);
System.out.println("password: "+ password);
System.out.println("timeout: "+timeout);
System.out.println("keepalive: "+ keepalive);
mqttPushClient.connect(hostUrl, clientID, username, password, timeout, keepalive);
// 以/#结尾表示订阅所有以test开头的主题
mqttPushClient.subscribe(defaultTopic, 0);
return mqttPushClient;
}
}
目的就是配置所对应的消息
第四步就是发布以及订阅等功能：
MqttPushClient
@Component
public class MqttPushClient {
private static final Logger logger = LoggerFactory.getLogger(MqttPushClient.class);
@Autowired
private PushCallback pushCallback;
private static MqttClient client;
private static MqttClient getClient() {
return client;
}
private static void setClient(MqttClient client) {
MqttPushClient.client = client;
}
/**
* 客户端连接
* @param host ip+端口
* @param clientID 客户端Id
* @param username 用户名
* @param password 密码
* @param timeout 超时时间
* @param keepalive 保留数
*/
public void connect(String host, String clientID, String username, String password, int timeout, int keepalive) {
MqttClient client;
try {
client = new MqttClient(host, clientID, new MemoryPersistence());
MqttConnectOptions options = new MqttConnectOptions();
options.setCleanSession(true);
options.setUserName(username);
options.setPassword(password.toCharArray());
options.setConnectionTimeout(timeout);
options.setKeepAliveInterval(keepalive);
MqttPushClient.setClient(client);
try {
client.setCallback(pushCallback);
client.connect(options);
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 发布
* @param qos 连接方式
* @param retained 是否保留
* @param topic 主题
* @param pushMessage 消息体
*/
public void publish(int qos, boolean retained, String topic, String pushMessage) {
MqttMessage message = new MqttMessage();
message.setQos(qos);
message.setRetained(retained);
message.setPayload(pushMessage.getBytes());
MqttTopic mTopic = MqttPushClient.getClient().getTopic(topic);
if (null == mTopic) {
logger.error("topic not exist");
}
MqttDeliveryToken token;
try {
token = mTopic.publish(message);
token.waitForCompletion();
} catch (MqttPersistenceException e) {
e.printStackTrace();
} catch (MqttException e) {
e.printStackTrace();
}
}
/**
* 订阅某个主题
* @param topic 主题
* @param qos 连接方式
*/
public void subscribe(String topic, int qos) {
logger.info("开始订阅主题" + topic);
try {
MqttPushClient.getClient().subscribe(topic, qos);
} catch (MqttException e) {
e.printStackTrace();
}
}
}
订阅主题以及发布的方式等内容更多编写
最后在搞个测试看看我们的结果是否正确：
TestController
@RestController
@RequestMapping("/")
public class TestController {
@Autowired
private MqttPushClient mqttPushClient;
@GetMapping(value = "/publishTopic")
public String publishTopic() {
String topicString = "home/garden/fountain";
mqttPushClient.publish(0, false, topicString, "测试一下发布消息");
return "ok";
}
// 发送自定义消息内容（使用默认主题）
@RequestMapping("/publishTopic/{data}")
public String test1(@PathVariable("data") String data) {
