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]; 
    } 

 

 

评论

1 楼 wly20110420 2016-05-10  

很详细，谢谢分享！