读输入流的字节，打印显示

File file = new File("C:\\Users\\Administrator\\Desktop\\a.txt");FileInputStream fis = new FileInputStream(file);ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] buffer = new byte[file.length()];int len = 0;while((len = fis.read(buffer))!=-1){ outStream.write(buffer, 0, len); }fis.close();outStream.close();byte[] data = outStream.toByteArray();String str = new String(data);System.out.println(str);}