common_helper/src/main/java/com/xiongyingqi/util/MD5Helper.java
public static String encrypt(String message, String encode, boolean toUpperCase) {
        MessageDigest messageDigest = null;

        try {
            messageDigest = MessageDigest.getInstance("MD5");
            messageDigest.reset();
            messageDigest.update(message.getBytes(encode));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        byte[] byteArray = messageDigest.digest();

        StringBuffer md5StrBuff = new StringBuffer();

        for (int i = 0; i < byteArray.length; i++) {
            if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) {
                md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
            } else {
                String hex = Integer.toHexString(0xFF & byteArray[i]);
                if (toUpperCase) {
                    hex = hex.toUpperCase();
                }
                md5StrBuff.append(hex);
            }
        }
        return md5StrBuff.toString();
    }
public static String encrypt(String message, String encode, boolean toUpperCase) {
        MessageDigest messageDigest = null;

        try {
            messageDigest = MessageDigest.getInstance("MD5");
            messageDigest.reset();
            messageDigest.update(message.getBytes(encode));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        byte[] byteArray = messageDigest.digest();

        StringBuffer md5StrBuff = new StringBuffer();

        for (int i = 0; i < byteArray.length; i++) {
            if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) {
                md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
            } else {
                String hex = Integer.toHexString(0xFF & byteArray[i]);
                if (toUpperCase) {
                    hex = hex.toUpperCase();
                }
                md5StrBuff.append(hex);
            }
        }
        return md5StrBuff.toString();
    }
MD5 加密 <br>
2013-11-4 下午6:33:06

@param message     要加密的内容
@param encode      message的编码方式
@param toUpperCase 是否转换成大写
@return 加密后的信息