import java.security.MessageDigest;public class MD5Util {	public static String md5(String string) {		if (string == null || string.trim().length() < 1) {			return null;		}		try {			byte[] bytes = string.getBytes("iso-8859-1");			String string2 = new String(bytes, "utf-8");			return getMD5(string2.getBytes());		} catch (Exception e) {			throw new RuntimeException(e.getMessage(), e);		}	}	public static String getMD5(byte[] source) {		try {			MessageDigest md5 = MessageDigest.getInstance("MD5");			StringBuffer result = new StringBuffer();			for (byte b : md5.digest(source)) {				result.append(Integer.toHexString((b & 0xf0) >>> 4));				result.append(Integer.toHexString(b & 0x0f));			}			return result.toString();		} catch (Exception e) {			throw new RuntimeException(e.getMessage(), e);		}	}}