java中String\十六进制String\byte[]之间相互转换函数和MD5加密

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];   
    }