JAVA十六进制数据接收与传输

一、十六进制转换工具类

主要包含十六进制字符串转ASCII，ASCII转十六进制字符串以及十六进制字符串转Byte数组等方法：

 /**
  * Created by wly on 2018/4/17.
  */
 public class HexConvert {

 public static String  convertStringToHex(String str){

     char[] chars = str.toCharArray();

     StringBuffer hex = new StringBuffer();
     for(int i = 0; i < chars.length; i++){
         hex.append(Integer.toHexString((int)chars[i]));
     }

     return hex.toString();
 }

 public static String convertHexToString(String hex){

     StringBuilder sb = new StringBuilder();
     StringBuilder sb2 = new StringBuilder();

     for( int i=0; i<hex.length()-1; i+=2 ){

         String s = hex.substring(i, (i + 2));
         int decimal = Integer.parseInt(s, 16);
         sb.append((char)decimal);
         sb2.append(decimal);
     }

     return sb.toString();
 }
 public static byte[] hexStringToBytes(String hexString) {
     if (hexString == null || hexString.equals("")) {
         return null;
     }
     // toUpperCase将字符串中的所有字符转换为大写
     hexString = hexString.toUpperCase();
     int length = hexString.length() / 2;
     // toCharArray将此字符串转换为一个新的字符数组。
     char[] hexChars = hexString.toCharArray();
     byte[] d = new byte[length];
     for (int i = 0; i < length; i++) {
         int pos = i * 2;
         d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
     }
     return d;
 }
 //返回匹配字符
 private static byte charToByte(char c) {
     return (byte) "0123456789ABCDEF".indexOf(c);
 }

 //将字节数组转换为short类型，即统计字符串长度
 public static short bytes2Short2(byte[] b) {
     short i = (short) (((b[1] & 0xff) << 8) | b[0] & 0xff);
     return i;
 }
 //将字节数组转换为16进制字符串
 public static String BinaryToHexString(byte[] bytes) {
     String hexStr = "0123456789ABCDEF";
     String result = "";
     String hex = "";
     for (byte b : bytes) {
         hex = String.valueOf(hexStr.charAt((b & 0xF0) >> 4));
         hex += String.valueOf(hexStr.charAt(b & 0x0F));
         result += hex + " ";
     }
     return result;
 }

 public static void main(String[] args) {

     System.out.println("======ASCII码转换为16进制======");
     String str = "*00007VERSION\\n1$";
     System.out.println("字符串: " + str);
     String hex = HexConvert.convertStringToHex(str);
     System.out.println("====转换为16进制=====" + hex);

     System.out.println("======16进制转换为ASCII======");
     System.out.println("Hex : " + hex);
     System.out.println("ASCII : " + HexConvert.convertHexToString(hex));

     byte[] bytes = HexConvert.hexStringToBytes( hex );

     System.out.println(HexConvert.BinaryToHexString( bytes ));
 }
 }

二、接收数据

 public class UdpReceiverThread {

 public static void main(String[] args) throws Exception {
 // 定义一个接收端，并且指定了接收的端口号
 DatagramSocket socket = new DatagramSocket(6070);

 while (true) {
     byte[] buf = new byte[1024*5];
     // 解析数据包
     DatagramPacket packet = new DatagramPacket(buf, buf.length);

     socket.receive(packet);

     String ip = packet.getAddress().getHostAddress();

     buf = packet.getData();

     //将字节数组转换为16进制字符串
     String hexString = HexConvert.BinaryToHexString( buf );//含有空格，如：2A 30 30 30 30 37 56 45 52 53 49 4F 4E 5C 6E 31 24 

     hexString =  hexString.replace( " ","" );//去除空格

     String asc = HexConvert.convertHexToString( hexString );//转为ASCII,如：*00007VERSION\n1$

     System.out.println("收到 " + ip + " 发来的消息：" + asc);

 }

 }
 }

三、发送数据

 public class UDPSenderThread {

 public static void main(String[] args) throws Exception {
 DatagramSocket socket = new DatagramSocket();

 String serial = "*00007VERSION\\n1$";//串口字符串

 String hex = HexConvert.convertStringToHex(serial);//转化为十六进制字符串：2a303030303756455253494f4e5c6e3124

 byte[] buf = HexConvert.hexStringToBytes( hex );//将十六进制字符串转为字节数组

 //将数据打包
 DatagramPacket packet = new DatagramPacket(buf, buf.length, InetAddress.getByName("192.168.11.139"), 6070);

 socket.send(packet);

 socket.close();

 }
 }

转载自坏菠萝

原文链接：https://blog.csdn.net/abcwanglinyong/article/details/79978061