java¼ÆËãÎļþºÍ×Ö·û´®µÄmd5Âë
import java.io.File;
import java.io.FileInputStream;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5Util
{
private static char md5Chars[] =
{ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
'e', 'f' };
private static MessageDigest messagedigest;
/*»ñÈ¡Ò»¸öÎļþµÄmd5Âë */
public static String getFileMD5String(File file) throws Exception
{
messagedigest = MessageDigest.getInstance("MD5");
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());
}
/*»ñÈ¡Ò»¸ö×Ö·û´®µÄmd5Âë */
public static String getStringMD5String(String str) throws Exception
{
messagedigest = MessageDigest.getInstance("MD5");
messagedigest.update(str.getBytes());
return bufferToHex(messagedigest.digest());
}
/*ÑéÖ¤Ò»¸ö×Ö·û´®ºÍÒ»¸öMD5ÂëÊÇ·ñÏàµÈ */
public static boolean check(String str,String md5) throws Exception
{
if(getStringMD5String(str).equals(md5))
return true;
else
return false;
}
/*ÑéÖ¤Ò»¸öÎļþºÍÒ»¸öMD5ÂëÊÇ·ñÏàµÈ */
public static boolean check(File f,String md5) throws Exception
{
if(getFileMD5String(f).equals(md5))
return true;
else
return false;
}
private static String bufferToHex(byte bytes[])
{
return bufferToHex(bytes, 0, bytes.length);
}
private static String bufferToHex(byte b
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