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java ´úÂë
public static String byteToString(byte b) {   
byte high, low;   
byte maskHigh = (byte)0xf0;   
byte maskLow = 0x0f;   
  
high = (byte)((b & maskHigh) >> 4);   
low = (byte)(b & maskLow);   
  
StringBuffer buf = new StringBuffer();   
buf.append(findHex(high));   
buf.append(findHex(low));   
  
return buf.toString();   
}   
  
private static char findHex(byte b) {   
int t = new Byte(b).intValue();   
t = t < 0 ? t + 16 : t;   
  
if ((0 <= t) &&(t <= 9)) {   
return (char)(t + '0');   
}   
  
return (char)(t-10+'A');   
}   
  
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java ´úÂë
public static int stringToByte(String in, byte[] b) throws Exception {   
if (b.length < in.length() / 2) {   
throw new Exception("byte array too small");   
}   
  
int j=0;   
StringBuffer buf = new StringBuffer(2);   
for (int i=0; i
buf.insert(0, in.charAt(i));   
buf.insert(1, in.charAt(i+1));   
int t = Integer.parseInt(buf.toString(),16);