java取得指定數據的sha-1校驗碼

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import com.sun.org.apache.xml.internal.security.utils.Base64;

public class getsha1
{
public static void main(String[] args)
{
if (0 == args.length)
{
System.out.println(“usage: “);
System.out.println(“java getsha1 xxxx.xx”);
return;
}

    try
    {
        MessageDigest md = MessageDigest.getInstance("sha-1");
        FileInputStream in = new FileInputStream(args[0]);

        byte[] buff = new byte[1024];
        int readed = -1;
        while ((readed = in.read(buff)) > 0)
        {
            for (int i = 0; i < readed; i++)
                md.update(buff[i]);
        }
        in.close();

        System.out.println("Name: " + args[0]);
        System.out.println("SHA1-Digest: " + Base64.encode((md.digest())));
    }
    catch (NoSuchAlgorithmException e)
    {
        System.out.println(e.toString());
    }
    catch (FileNotFoundException e)
    {
        System.out.println(e.toString());
    }
    catch (Exception e)
    {
        System.out.println(e.toString());
    }
}

}