java取得指定数据的sha-1校验码

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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());    }}

}

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