Android Open Source - JiangHomeStyle_Android_Phone M D5 Tools

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License

The source code is released under:

Apache License

Java Source Code

package com.cidesign.jianghomestylephone.tools;
/*from  w w  w  .  j  a v  a2 s .co  m*/
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Tools
{
  /**
   * ??????????????????????????????? 16 ???????????,apache?????????????????????????????????
   */
  protected static char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

  protected static MessageDigest messagedigest = null;

  static
  {
    try
    {
      messagedigest = MessageDigest.getInstance("MD5");
    }
    catch (NoSuchAlgorithmException nsaex)
    {
      System.err.println(MD5Tools.class.getName() + "?????????MessageDigest?????MD5Util??");
      nsaex.printStackTrace();
    }
  }

  /**
   * ???????????md5????
   * 
   * @param s
   * @return
   */
  public static String getMD5String(String s)
  {
    return getMD5String(s.getBytes());
  }

  /**
   * ??????????md5??????????????????md5???????
   * 
   * @param password
   *            ??????????
   * @param md5PwdStr
   *            ?????md5?????
   * @return
   */
  public static boolean checkPassword(String password, String md5PwdStr)
  {
    String s = getMD5String(password);
    return s.equals(md5PwdStr);
  }

  /**
   * ?????????md5????
   * 
   * @param file
   * @return
   * @throws IOException
   */
  public static String getFileMD5String(File file) throws IOException
  {
    InputStream fis;
    fis = new FileInputStream(file);
    byte[] buffer = new byte[1024];
    int numRead = 0;
    while ((numRead = fis.read(buffer)) > 0)
    {
      messagedigest.update(buffer, 0, numRead);
    }
    fis.close();
    return bufferToHex(messagedigest.digest());
  }

  /**
   * JDK1.4????????MappedByteBuffer?????????update?????????????????????????MappedByteBuffer??
   * ????????? FileChannel.map ???????MappedByteBuffer ?????????????????????? ?????
   * FileChannel.close ???????????????????????FileChannel?????????? unmap ???????
   * ???????????????????????
   * 
   * ????????
   * 
   * @param file
   * @return
   * @throws IOException
   */
  public static String getFileMD5String_old(File file) throws IOException
  {
    FileInputStream in = new FileInputStream(file);
    FileChannel ch = in.getChannel();
    MappedByteBuffer byteBuffer = ch.map(FileChannel.MapMode.READ_ONLY, 0, file.length());
    messagedigest.update(byteBuffer);
    return bufferToHex(messagedigest.digest());
  }

  public static String getMD5String(byte[] bytes)
  {
    messagedigest.update(bytes);
    return bufferToHex(messagedigest.digest());
  }

  private static String bufferToHex(byte bytes[])
  {
    return bufferToHex(bytes, 0, bytes.length);
  }

  private static String bufferToHex(byte bytes[], int m, int n)
  {
    StringBuffer stringbuffer = new StringBuffer(2 * n);
    int k = m + n;
    for (int l = m; l < k; l++)
    {
      appendHexPair(bytes[l], stringbuffer);
    }
    return stringbuffer.toString();
  }

  private static void appendHexPair(byte bt, StringBuffer stringbuffer)
  {
    char c0 = hexDigits[(bt & 0xf0) >> 4];// ??????? 4 ??????????, >>>
                        // ???????????????????????,????????????????????
    char c1 = hexDigits[bt & 0xf];// ??????? 4 ??????????
    stringbuffer.append(c0);
    stringbuffer.append(c1);
  }
}

Java Source Code List

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