import java.security.MessageDigest;

public class MD5Tools {

    /**

     * 将字符串进行md5加密

     */

    public static String create(String str) {

        MessageDigest md = null;

        try {

            md = MessageDigest.getInstance("MD5");

        } catch (Exception e) {

            System.out.println(e.toString());

            e.printStackTrace();

            return "";

        }

        char[] charArray = str.toCharArray();

        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++)

            byteArray[i] = (byte) charArray[i];

        byte[] md5Bytes = md.digest(byteArray);

        StringBuffer hexValue = new StringBuffer();

        for (int i = 0; i < md5Bytes.length; i++) {

            int val = ((int) md5Bytes[i]) & 0xff;

            if (val < 16)

                hexValue.append("0");

            hexValue.append(Integer.toHexString(val));

        }

        return hexValue.toString();

    }

}