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java StringUtil function

2007-08-06 13:39 363 查看

import java.security.MessageDigest;

public class StringUtil {

/**
* @param args
*/
public static void main(String[] args) {
  // TODO Auto-generated method stub
  //System.out.println(MD5Encode("a"));
}

private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",
   "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

/**
* 转换字节数组为16进制字串
*
* @param b
*            字节数组
* @return 16进制字串
*/

public static String byteArrayToHexString(byte[] b) {
  StringBuffer resultSb = new StringBuffer();
  for (int i = 0; i < b.length; i++) {
   resultSb.append(byteToHexString(b[i]));
  }
  return resultSb.toString();
}

private static String byteToHexString(byte b) {
  int n = b;
  if (n < 0)
   n = 256 + n;
  int d1 = n / 16;
  int d2 = n % 16;
  return hexDigits[d1] + hexDigits[d2];
}

public static String MD5Encode(String origin) {
  String resultString = null;

  try {
   resultString = new String(origin);
   MessageDigest md = MessageDigest.getInstance("MD5");
   resultString = byteArrayToHexString(md.digest(resultString
     .getBytes()));
  } catch (Exception ex) {

  }
  return resultString;
}

}

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标签： function java string exception byte import

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