Java中byte[]、String、Hex字符串等转换的方法

/*输入一个byte和byte[]合并为byte[]*/ public byte[] byteMerger(byte byte_1, byte[] byte_2) {  byte[] byte_3 = new byte[1 + byte_2.length];  byte_3[0] = byte_1;  System.arraycopy(byte_2, 0, byte_3, 1, byte_2.length);  return byte_3;  } /*输入一个byte[]和byte[]合并为byte[]*/ public byte[] byteMerger(byte[] byte_1, byte[] byte_2) {  byte[] byte_3 = new byte[1 + byte_2.length];  byte_3[0] = byte_1;  System.arraycopy(byte_2, 0, byte_3, byte_1.length, byte_2.length);  return byte_3;  } /*输入一个string（16进制的字符hex eg：ff）输出为16进制的byte[]，注意输入为小写的hex字符串*/ public byte[] hexStringToByte(String hex) {  int len = (hex.length() / 2);  byte[] result = new byte[len];  char[] achar = hex.toCharArray();  for (int i = 0; i < len; i++) {   int pos = i * 2;   result[i] = (byte) (charToByte(achar[pos]) << 4 | charToByte(achar[pos + 1]));  }  //System.out.println(Arrays.toString(result));  return result;  }  private byte charToByte(char c) {  //return (byte) "0123456789ABCDEF".indexOf(c);  return (byte) "0123456789abcdef".indexOf(c);  } /*输入10进制数字字符串，输出hex字符串（2位,eg: f 则输出 0f）*/ String value= "100"; int parseInt = Integer.parseInt(value, 10); String hexString = Integer.toHexString(parseInt);   if (hexString.length() < 2) {   hexString = '0' + hexString;   }   header = header + hexString;  } /*输入16进制byte[]输出16进制字符串*/  public static String byteArrayToHexStr(byte[] byteArray) {  if (byteArray == null) {   return null;  }  char[] hexArray = "0123456789ABCDEF".toCharArray();  char[] hexChars = new char[byteArray.length * 2];  for (int j = 0; j < byteArray.length; j++) {   int v = byteArray[j] & 0xFF;   hexChars[j * 2] = hexArray[v >>> 4];   hexChars[j * 2 + 1] = hexArray[v & 0x0F];  }  return new String(hexChars);  } 

let str = "http%3A%2F%2Fxxxxxxxx%2Findex.php%2Fxxxxxxx%2FMember%2Fregister%3Frecommend_id%3D11442%26id%3D87"; function replaceStr(str){  str = str.replace(/%3A/g, ":");  str = str.replace(/%2F/g, "/");  str = str.replace(/%3F/g, "?");  str = str.replace(/%3D/g, "=");  str = str.replace(/%26/g, "&");  str = str.replace(/%2B/g, "+");  str = str.replace(/%20/g, " ");  str = str.replace(/%23/g, "#");  return str; } console.log(replaceStr(str));