java中如何操作BYTE[]

/**
  * 加入附件
  * @param String path
  * @return
  * @throws IOException
  */
 public static byte[] insertBlob( String path) throws IOException{
  byte[] buffer = new byte[1];
  buffer[0] = 1;
  InputStream in = null;
  in = new FileInputStream(path);
  byte[] b = new byte[(int) in.available()];
  in.read(b);

  return b;
  
 }
 
 /**
  * 取出包含的附件
  * @param Object obj, String path
  * @return
  * @throws SQLException
  */
 public static void writeBlobByPath(Object obj, String path) throws IOException, SQLException{

//   BLOB blob = (BLOB)obj;
   byte[] blob = (byte[])obj;
   InputStream ins = new ByteArrayInputStream(blob);
   BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(path));
   BufferedInputStream in = new BufferedInputStream(ins);
   int c;
   while ((c=in.read())!=-1) {
   out.write(c);
   }
   in.close();
   out.close();

 }