MD5Encoder加密支持utf-8

 import java.security.MessageDigest;

 public class MD5Encoder {

     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();
     }
 }