//org.apache.commons.io.IOUtils.toByteArray已经有实现 String filePath = "D:\\aaa.txt"; in = new FileInputStream(new File(filePath)); fileBytes =IOUtils.toByteArray(in);
java中InputStream转化为byte[]数组
原文：http://www.cnblogs.com/lxjshuju/p/6813044.html
