@socket来通讯485转网络

通过socket来通讯485转网络

这是一个通过socket来通讯硬件的方法,抓取硬件传来的数据进行输入,并且实时数据传输。第一次写博客直接就放代码了。

创建DatagramSocket对象

static String responseMsg = ""; private String sendAndReceive(String ip, int port, String msg) {     try {         //创建客户端的DatagramSocket对象，不必传入地址和对象         client = new DatagramSocket();         byte[] sendBytes = hexStrToBytes(msg.replaceAll(" ", ""));         System.out.println();         //封装要发送目标的地址         InetAddress address = InetAddress.getByName(ip);         //封装要发送的DatagramPacket的对象，由于要发送到目的主机，所以要加上地址和端口号         DatagramPacket sendPacket = new DatagramPacket(sendBytes,sendBytes.length,address,port);          try {             //发送数据             client.send(sendPacket);         }catch (Exception e){             e.printStackTrace();         }         System.out.println("数据发送成功:" + msg);                  byte[] responseBytes = new byte[1024];         //创建响应信息的DatagramPacket对象         DatagramPacket responsePacket = new DatagramPacket(responseBytes,1024);         try {             //等待响应信息，同服务端一样，客户端也会在这一步阻塞，直到收到一个数据包             client.receive(responsePacket);             //client.send(responsePacket);         }catch (Exception e){             e.printStackTrace();         }         System.out.println("数据读取成功:" + msg);          //解析数据包内容         responseMsg = bytesToHexString(responsePacket.getData(),responsePacket.getLength());     }catch (Exception e){         e.printStackTrace();     }finally {         //关闭客户端         if(client != null){             client.close();             client = null;         } 

转16进制

因为我这边的传感器只接收16进制的所以我要转一下

 private byte[] hexStrToBytes(String hexStr) {    if(null == hexStr || "".equals(hexStr)) {   return null;  }  if(0 != hexStr.length() % 2) {   hexStr = "0" + hexStr;  }  char[] chars = hexStr.toCharArray();  int len = chars.length/2;  byte[] bytes = new byte[len];  for (int i = 0; i < len; i++) {   int x = i * 2;   bytes[i] = (byte)Integer.parseInt(String.valueOf(new char[]{chars[x], chars[x+1]}), 16);     }  return bytes; } private String bytesToHexString(byte[] bytes, int length) {  if(null == bytes || bytes.length < length) {   return null;  }  StringBuffer sb = new StringBuffer();  for (int i = 0; i < length; i++) {   String strHex = Integer.toHexString(bytes[i]);   if(strHex.length() > 3) {    sb.append(strHex.substring(6));   } else {    if(strHex.length() < 2) {     sb.append("0" + strHex);    } else {     sb.append(strHex);    }   }  }  return sb.toString(); } 

发送指令

因为我这个需要给传感器发送一个指令,传感器才会返回数据
String msg = “e0 05 07 02 4b”;,这个指令是商家给的

   UDPClient client = new UDPClient();     String msg = "e0 05 07 02 4b";     System.out.println("发送命令：" + msg);     String sendAndReceive="as";     sendAndReceive = client.sendAndReceive("192.168.0.189",6000, msg);     System.out.println(sendAndReceive);         //湿度     String humidity = responseMsg.substring(6,10);     BigInteger bigint=new BigInteger(humidity, 16);     int intValue = bigint.intValue();     System.out.println("湿度:"+intValue/10.0+"%RH");               //温度     String  temperature = responseMsg.substring(10,14);     BigInteger bigint1=new BigInteger(temperature, 16);       int intValue1 = bigint1.intValue();     System.out.println("温度:"+intValue1/10.0+"℃");    } 

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