Java IO 字节流计数有关问题

InputStream in = new FileInputStream(file);BufferedReader br = new BufferedReader(new InputStreamReader(in, "UTF-8"));long count = 0;                String line = br.readLine();                while (line != null) {                    count += line.getBytes("UTF-8").length;                    count += 1;    // Add \r's length                    System.out.println(Thread.currentThread() + "  " + line);                    System.out.println(" count:" + count);                    line = br.readLine();                }

InputStream in = new FileInputStream(file);System.out.println(in.available());