这是一个很有价值的字节处理类,在我的万能表单解析程序中直接加以引用,现转载,以示对原作者的敬意。
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
/**
*这个类来自《电脑编程技巧与维护》2007合订本 实例33
* @author PC_WalkerMa
*/
public class ByteProcess {
static private final String CharSet = "0123456789ABCDEF";
public static int HexCharToNum(String ch){
ch = ch.toUpperCase();
return CharSet.indexOf(ch);
}
public static byte TwoHexCharsToByte(String chs){
int i,j;
chs = chs.toUpperCase();
if (chs.length() < 2) return -1;
i = HexCharToNum(chs.substring(0,1));
j = HexCharToNum(chs.substring(1,2));
return (byte)(i*16+j);
}
public static byte[] HexCharsToBytes(String chs){
int i, nLen;
byte bTmp;
nLen = (chs.length())/2;
byte[] bResult = new byte[nLen];
for (i=0; i<nLen; i++){
bTmp = TwoHexCharsToByte(chs.substring(i*2,(i+1)*2));
bResult[i] = bTmp;
}
return bResult;
}
public static String ByteToTwoHexChar(byte bIn) {
int i, j;
String strResult = "";
i = ((int)bIn >> 4 & 0xf);
strResult += CharSet.substring(i, i+1);
j = (int)bIn & 0xf;
strResult += CharSet.substring(j, j+1);
return strResult;
}
public static String BytesToHexChars(byte[] bIn){
int nLen;
String strResult = "";
nLen = bIn.length;
for(int i=0; i<nLen; i++){
strResult += ByteToTwoHexChar(bIn[i]);
}
return strResult;
}
public static String InsertSpaceToHexChars(String strIn){
int nLen;
String strResult = "";
nLen = strIn.length();
for(int i=0; i<nLen/2; i++){
strResult += strIn.substring(i*2, (i+1)*2) + " ";
}
return strResult;
}
public static String DeleteSpaceFromHexChars(String strIn){
int nLen;
String strTmp;;
String strResult = "";
nLen = strIn.length();
for(int i=0; i<nLen; i++){
strTmp = (String)(strIn.subSequence(i,i+1));
if(strTmp.equals(" ") == false) strResult = strResult.concat(strTmp);
}
return strResult;
}
public static byte[] GetBytesFromByteBuffer(ByteBuffer buf){
int bLen;
byte[] bResult;
bLen = buf.position();
if (bLen>0){
bResult = new byte[bLen];
buf.rewind();
buf.get(bResult, 0, bLen);
return bResult;
}
else return null;
}
public static String BytesToEnString(byte[] bIn){
String strOut = "";
try {
strOut= new String(bIn, "UTF-8");
} catch (UnsupportedEncodingException e) {}
return strOut;
}
public static byte[] EnStringToBytes(String strIn){
byte[] bOut = new byte[strIn.length()];
try {
bOut = strIn.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {}
return bOut;
}
public static byte[] StringToUnicode(String strIn){
byte[] bOut = new byte[strIn.length()*2];
try {
bOut = strIn.getBytes("UTF-16BE");
} catch (UnsupportedEncodingException e) {}
return bOut;
}
public static String StringToUnicodeHexChars(String strIn){
return (BytesToHexChars(StringToUnicode(strIn)));
}
public static String UnicodeToString(byte[] bIn) {
String strOut = "";
try {
strOut = new String(bIn, "UTF-16BE");
} catch (UnsupportedEncodingException e) {}
return strOut;
}
public static String UnicodeHexCharsToString(String strIn){
return (UnicodeToString(HexCharsToBytes(strIn)));
}
}