Java 实现MD5

package com.feinno.common.util;

import java.security.MessageDigest;

public final class MD5Util {
 protected final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",
   "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

 public static String getMD5(String input) {
  try {
   MessageDigest md = MessageDigest.getInstance("MD5");
   return byteArrayToHexString(md.digest(input.getBytes()));
  } catch (Exception e) {
   e.printStackTrace();
  }
  return "";
 }

 protected 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();
 }

 protected 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 void main(String[] args) {
  System.out.println("40664f04f401384867f7730815ac6a12");
  System.out.println(getMD5("98:D6:BB:49:E4:02"));
  
 }

}

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