ConvertUtil.java

package com.bestapp.yikuair.utils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/***
 * ת�� MD5������
 */
public final class ConvertUtil {

	public final static char[] BToA = "0123456789abcdef".toCharArray();

	private ConvertUtil() {

	}

	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;
	}

	public static final String bytesToHexString(byte[] bArray) {
		if (bArray == null) {
			return "";
		}
		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();
	}

	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;
	}

	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));
	}

	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();
	}

	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;
	}

	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();
	}

	/**
	 * ���ַ��������
	 */
	public static byte[] byteArrXor(byte[] arr1, byte[] arr2, int len) {
		byte[] dest = new byte[len];

		if ((arr1.length < len) || (arr2.length < len)) {
			return null;
		}

		for (int i = 0; i < len; i++) {
			dest[i] = (byte) (arr1[i] ^ arr2[i]);
		}

		return dest;
	}

	public static String MD5EncodeToHex(String origin) {
		return bytesToHexString(MD5Encode(origin));
	}

	public static byte[] MD5Encode(String origin) {
		return MD5Encode(origin.getBytes());
	}

	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];
		}

	}

}