jfinal 使用类里的方法

package demo;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import com.jfinal.core.Controller;

public class HelloController extends Controller {

    public static byte[] getKeyedDigest(byte[] buffer, byte[] key) {

        try {

            MessageDigest md5 = MessageDigest.getInstance("MD5");

            md5.update(buffer);

            return md5.digest(key);

        } catch (NoSuchAlgorithmException e) {

        }

        return null;

    }

    public static String getKeyedDigest(String strSrc, String key) {

        try {

            MessageDigest md5 = MessageDigest.getInstance("MD5");

            md5.update(strSrc.getBytes("UTF8"));

            String result="";

            byte[] temp;

            temp=md5.digest(key.getBytes("UTF8"));

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

                result+=Integer.toHexString((0x000000ff & temp[i]) | 0xffffff00).substring(6);

            }

            return result;

        } catch (NoSuchAlgorithmException e) {

            e.printStackTrace();

        }catch(Exception e)

        {

          e.printStackTrace();

        }

        return null;

    }

    /**

     * @param args

     */

    public void index() {

        String mi;

        String s = "prodid=8096&agentid=123&backurl=&returntype=2&orderid=agentid1405210000&mobilenum=13811528470&source=esales&mark=&merchantKey=111111";

        mi=HelloController.getKeyedDigest(s,"");

        renderText("mi:"+mi);

        }

}