java中String\十六进制String\byte[]之间相互转换函数

java二进制,字节数组,字符,十六进制,BCD编码转换2007-06-07 00:17/** *//**

* 把16进制字符串转换成字节数组

* @param hex

* @return

*/

public static 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) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));

}

return result;

}

private static byte toByte(char c) {

byte b = (byte) "0123456789ABCDEF".indexOf(c);

return b;

}

/** *//**

* 把字节数组转换成16进制字符串

* @param bArray

* @return

*/

public static final String bytesToHexString(byte[] bArray) {

StringBuffer sb = new StringBuffer(bArray.length);

String sTemp;

for (int i = 0; i < bArray.length; i++) {

sTemp = Integer.toHexString(0xFF & bArray[i]);

if (sTemp.length() < 2)

sb.append(0);

sb.append(sTemp.toUpperCase());

}

return sb.toString();

}

/** *//**

* 把字节数组转换为对象

* @param bytes

* @return

* @throws IOException

* @throws ClassNotFoundException

*/

public static final Object bytesToObject(byte[] bytes) throws IOException, ClassNotFoundException {

ByteArrayInputStream in = new ByteArrayInputStream(bytes);

ObjectInputStream oi = new ObjectInputStream(in);

Object o = oi.readObject();

oi.close();

return o;

}

/** *//**

* 把可序列化对象转换成字节数组

* @param s

* @return

* @throws IOException

*/

public static final byte[] objectToBytes(Serializable s) throws IOException {

ByteArrayOutputStream out = new ByteArrayOutputStream();

ObjectOutputStream ot = new ObjectOutputStream(out);

ot.writeObject(s);

ot.flush();

ot.close();

return out.toByteArray();

}

public static final String objectToHexString(Serializable s) throws IOException{

return bytesToHexString(objectToBytes(s));

}

public static final Object hexStringToObject(String hex) throws IOException, ClassNotFoundException{

return bytesToObject(hexStringToByte(hex));

}

/** *//**

* @函数功能: BCD码转为10进制串(阿拉伯数据)

* @输入参数: BCD码

* @输出结果: 10进制串

*/

public static String bcd2Str(byte[] bytes){

StringBuffer temp=new StringBuffer(bytes.length*2);

for(int i=0;i<bytes.length;i++){

temp.append((byte)((bytes[i]& 0xf0)>>>4));

temp.append((byte)(bytes[i]& 0x0f));

}

return temp.toString().substring(0,1).equalsIgnoreCase("0")?temp.toString().substring(1):temp.toString();

}

/** *//**

* @函数功能: 10进制串转为BCD码

* @输入参数: 10进制串

* @输出结果: BCD码

*/

public static byte[] str2Bcd(String asc) {

int len = asc.length();

int mod = len % 2;

if (mod != 0) {

asc = "0" + asc;

len = asc.length();

}

byte abt[] = new byte[len];

if (len >= 2) {

len = len / 2;

}

byte bbt[] = new byte[len];

abt = asc.getBytes();

int j, k;

for (int p = 0; p < asc.length()/2; p++) {

if ( (abt[2 * p] >= '0') && (abt[2 * p] <= '9')) {

j = abt[2 * p] - '0';

} else if ( (abt[2 * p] >= 'a') && (abt[2 * p] <= 'z')) {

j = abt[2 * p] - 'a' + 0x0a;

} else {

j = abt[2 * p] - 'A' + 0x0a;

}

if ( (abt[2 * p + 1] >= '0') && (abt[2 * p + 1] <= '9')) {

k = abt[2 * p + 1] - '0';

} else if ( (abt[2 * p + 1] >= 'a') && (abt[2 * p + 1] <= 'z')) {

k = abt[2 * p + 1] - 'a' + 0x0a;

}else {

k = abt[2 * p + 1] - 'A' + 0x0a;

}

int a = (j << 4) + k;

byte b = (byte) a;

bbt[p] = b;

}

return bbt;

}

/** *//**

* @函数功能: BCD码转ASC码

* @输入参数: BCD串

* @输出结果: ASC码

*/

public static String BCD2ASC(byte[] bytes) {

StringBuffer temp = new StringBuffer(bytes.length * 2);

for (int i = 0; i < bytes.length; i++) {

int h = ((bytes[i] & 0xf0) >>> 4);

int l = (bytes[i] & 0x0f);

temp.append(BToA[h]).append( BToA[l]);

}

return temp.toString() ;

}

/** *//**

* MD5加密字符串，返回加密后的16进制字符串

* @param origin

* @return

*/

public static String MD5EncodeToHex(String origin) {

return bytesToHexString(MD5Encode(origin));

}

/** *//**

* MD5加密字符串，返回加密后的字节数组

* @param origin

* @return

*/

public static byte[] MD5Encode(String origin){

return MD5Encode(origin.getBytes());

}

/** *//**

* MD5加密字节数组，返回加密后的字节数组

* @param bytes

* @return

*/

public static byte[] MD5Encode(byte[] bytes){

MessageDigest md=null;

try {

md = MessageDigest.getInstance("MD5");

return md.digest(bytes);

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

return new byte[0];

}