MD5Helper MD5加密

package com.sd.sdactivity.utils;
import java.security.MessageDigest;
public class MD5Helper {
   public static String encrypt(String str) {
    try {
    MessageDigest m = MessageDigest.getInstance("MD5");
        m.update(str.getBytes("UTF8"));
      byte s[] = m.digest();
      StringBuilder result = new StringBuilder();
       for (byte value : s) {
   result.append(Integer.toHexString((0x000000FF & value) | 0xFFFFFF00)
                 .substring(6));
        }
        return result.toString();
      } catch (Exception e) {

   e.printStackTrace();

            return "";

        }

    }

}