在这个系列之前的文章里，我们介绍了Iotdb的LSM，以及Iot中的最佳实践，这次我们看看如何将mqtt和Iotdb整合起来。下面我们开始：
iotdb in docker
首先，做一个测试环境，我现在越发喜欢docker 和 WSL 了，除了吃点硬盘，内存和CPU资源以外，没有什么缺点了......
run in docker
直接把该开的端口都打开，只是测试环境，我就没再挂目录。
docker run -d -p 6667:6667 -p 31999:31999 -p 8181:8181 -p 5555:5555 -p 1883:1883 apache/iotdb
等待一会，执行 docker ps 查看是否成功了
➜ ~ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
ad9b18f8bff3 apache/iotdb "/iotdb/sbin/start-s…" 2 hours ago Up 2 hours 0.0.0.0:1883->1883/tcp, :::1883->1883/tcp, 0.0.0.0:5555->5555/tcp, :::5555->5555/tcp, 0.0.0.0:6667->6667/tcp, :::6667->6667/tcp, 0.0.0.0:8181->8181/tcp, :::
初步的iotdb in docker 环境，我们就搞好了。接下来，开启mqtt服务。
开启 Mqtt 服务
进入iotdb的docker docker exec -it ad9b18f8bff3 /bin/bash
编辑配置文件vi iotdb/conf/iotdb-engine.properties
开启服务，根据自己的需要，配置ip和端口等。
代码语言：javascript复制####################
### MQTT Broker Configuration
####################
# whether to enable the mqtt service.
enable_mqtt_service=false # 修改成 true ， 代表开启 mqtt服务
# the mqtt service binding host.
mqtt_host=0.0.0.0 # ip
# the mqtt service binding port.
mqtt_port=1883 # 端口
# the handler pool size for handing the mqtt messages.
mqtt_handler_pool_size=1
# the mqtt message payload formatter.
mqtt_payload_formatter=json # 数据格式
# max length of mqtt message in byte
mqtt_max_message_size=1048576重启服务，如果不会，就重启docker镜像。
iotdb 基础操作
- 启动服务:
sbin/start-client.shroot@ad9b18f8bff3:/iotdb/sbin# ./start-cli.sh --------------------- Starting IoTDB Cli --------------------- _____ _________ ______ ______ |_ _| | _ _ ||_ _ `.|_ _ | | .--.|_/ | | _| | | `. | |_) | | | / .'` | | | | | | | __'. _| |_| __. | _| |_ _| |_.' /_| |__) | |_____|'.__.' |_____| |______.'|_______/ version 0.11.1 IoTDB> login successfully - 退出CLI:
quit或exit - 停止服务：
$sbin/stop-server.sh - 设置一个存储组到IOTDB，名为root :
IoTDB> SET STORAGE GROUP TO root - 查看当前IOTDB的存储组 ：
IoTDB> SHOW STORAGE GROUPIoTDB> SHOW STORAGE GROUP ------------- |storage group| ------------- | root.test| ------------- Total line number = 1 It costs 0.127s - 查看系统中存在的所有时间序列 ：
IoTDB> SHOW TIMESERIESIoTDB> show timeseries ------------------------------- ----- ------------- -------- -------- ----------- ---- ---------- | timeseries|alias|storage group|dataType|encoding|compression|tags|attributes| ------------------------------- ----- ------------- -------- -------- ----------- ---- ---------- |root.test.wf01.wt01.temperature| null| root.test| FLOAT| GORILLA| SNAPPY|null| null| | root.test.wf01.wt01.status| null| root.test| BOOLEAN| RLE| SNAPPY|null| null| | root.test.wf01.wt01.hardware| null| root.test| TEXT| PLAIN| SNAPPY|null| null| ------------------------------- ----- ------------- -------- -------- ----------- ---- ---------- Total line number = 3 It costs 0.009s - 查看系统中存在的特定时间序列:
SHOW TIMESERIES root.test.wf01.wt01.statusIoTDB> SHOW TIMESERIES root.test.wf01.wt01.status -------------------------- ----- ------------- -------- -------- ----------- ---- ---------- | timeseries|alias|storage group|dataType|encoding|compression|tags|attributes| -------------------------- ----- ------------- -------- -------- ----------- ---- ---------- |root.test.wf01.wt01.status| null| root.test| BOOLEAN| RLE| SNAPPY|null| null| -------------------------- ----- ------------- -------- -------- ----------- ---- ---------- Total line number = 1 It costs 0.003s - 插入数据
INSERT INTO root.test.wf01.wt01(timestamp,status,temperature) values(200,false,20.71)IoTDB> INSERT INTO root.test.wf01.wt01(timestamp,status,temperature) values(200,false,20.71) Msg: The statement is executed successfully. - 查看数据:
select * from root.test;IoTDB> select * from root.test; ------------------------ ------------------------------- -------------------------- ---------------------------- | Time|root.test.wf01.wt01.temperature|root.test.wf01.wt01.status|root.test.wf01.wt01.hardware| ------------------------ ------------------------------- -------------------------- ---------------------------- |2021-01-20T02:00:00.000Z| 21.2| true| hello| ------------------------ ------------------------------- -------------------------- ---------------------------- Total line number = 1 It costs 0.077s - 查看设备：
show devicesIoTDB> show devices ------------------- | devices| ------------------- |root.test.wf01.wt01| ------------------- Total line number = 1 It costs 0.002s
mqtt to iotdb
代码
构建一个实体对象，用于存储
代码语言：javascript复制package wang.datahub.iotdb;
import com.google.gson.Gson;
import java.util.List;
public class IotdbVO {
private String device;
private long timestamp = System.currentTimeMillis();
private List<String> measurements;
private List<Object> values;
public String getDevice() {
return device;
}
public void setDevice(String device) {
this.device = device;
}
public long getTimestamp() {
return timestamp;
}
public void setTimestamp(long timestamp) {
this.timestamp = timestamp;
}
public List<String> getMeasurements() {
return measurements;
}
public void setMeasurements(List<String> measurements) {
this.measurements = measurements;
}
public List<Object> getValues() {
return values;
}
public void setValues(List<Object> values) {
this.values = values;
}
public String toJson(){
Gson g = new Gson();
String jsonData = g.toJson(this);
return jsonData;
}
@Override
public String toString() {
return "IotdbVO{"
"device='" device '''
", timestamp=" timestamp
", measurements=" measurements
", values=" values
'}';
}
}使用祖传的代码来模拟数据发射到iotdb，这里直接将mqtt的主机和端口，配置到前文所修改的iotdb的mqtt服务上，就大功告成了。
代码语言：javascript复制package wang.datahub.iotdb;
import org.fusesource.mqtt.client.BlockingConnection;
import org.fusesource.mqtt.client.MQTT;
import org.fusesource.mqtt.client.QoS;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
public class EmmitToIotdb {
public static void main(String[] args) {
String[] hardwares = new String[]{
"a1",
"b1",
"b2",
"c3",
"d1",
"f5"
};
int count = 1000;
for(int i = 0; i < count ;i ){
IotdbVO iotdbVO = new IotdbVO();
iotdbVO.setDevice("root.test.wf01.wt01");
List<String> measurements = new ArrayList<>();
List<Object> values = new ArrayList<>();
measurements.add("temperature");
measurements.add("status");
measurements.add("hardware");
Random r = new Random();
values.add(r.nextInt(40));
values.add(r.nextBoolean());
values.add(hardwares[r.nextInt(hardwares.length)]);
iotdbVO.setMeasurements(measurements);
iotdbVO.setValues(values);
emmitToIotdb(iotdbVO);
}
}
public static void emmitToIotdb(IotdbVO content){
try {
MQTT mqtt = new MQTT();
mqtt.setHost("127.0.0.1", 1883);
mqtt.setUserName("root");
mqtt.setPassword("root");
BlockingConnection connection = mqtt.blockingConnection();
connection.connect();
String payload = content.toJson();
connection.publish(content.getDevice(),payload.getBytes(), QoS.AT_LEAST_ONCE,false);
connection.disconnect();
} catch (Exception e){
e.printStackTrace();
}
}
}执行结果
iotdb，功能还是相当强大的，也非常有意思，希望本篇文章对你有所帮助，也非常欢迎您来与我交流。
