MD5 加密工具类

public class MD5Encoder {    /**     * MD5加密     * @param string     * @return     * @throws Exception     */    public static String encode(String string) throws Exception {        byte[] hash = MessageDigest.getInstance("MD5").digest(string.getBytes("UTF-8"));        StringBuilder hex = new StringBuilder(hash.length * 2);        for (byte b : hash) {            if ((b & 0xFF) < 0x10) {                hex.append("0");            }            hex.append(Integer.toHexString(b & 0xFF));        }        return hex.toString();    }}