@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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