java实现MD5和SHA1加密

public class EncodeUtils {
	private static final String[] hexDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

	/**
	 * 
	 * @param b
	 * @return
	 */
	private static String bytesToHexString(byte[] b) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			int n = b[i];
			if (n < 0) {
				n += 256;
			}
			int d1 = n / 16;
			int d2 = n % 16;
			resultSb.append(hexDigits[d1] + hexDigits[d2]);
		}
		return resultSb.toString();
	}

	/**
	 * MD5加密
	 * 
	 * @param origin
	 * @param charsetname
	 * @return
	 */
	public static String MD5Encode(String origin, String charsetname) {
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			if ((charsetname == null) || ("".equals(charsetname))) {
				return bytesToHexString(md.digest(origin.getBytes()));
			} else {
				return bytesToHexString(md.digest(origin.getBytes(charsetname)));
			}
		} catch (Exception localException) {
		}
		return null;
	}

	/**
	 * sha1加密
	 * 
	 * @param origin
	 * @param charsetname
	 * @return
	 */
	public static String SHA1Encode(String origin, String charsetname) {
		try {
			MessageDigest sha1 = MessageDigest.getInstance("SHA1");
			if ((charsetname == null) || ("".equals(charsetname))) {
				return bytesToHexString(sha1.digest(origin.getBytes()));
			} else {
				return bytesToHexString(sha1.digest(origin.getBytes(charsetname)));
			}
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}
}