Java中文件与字节数组转换

注:来源于JavaEye

 

文件转化为字节数组:

http://www.javaeye.com/topic/304980

 

/** * 文件转化为字节数组 * * @param file * @return */ public static byte[] getBytesFromFile(File file) { byte[] ret = null; try { if (file == null) { // log.error("helper:the file is null!"); return null; } FileInputStream in = new FileInputStream(file); ByteArrayOutputStream out = new ByteArrayOutputStream(4096); byte[] b = new byte[4096]; int n; while ((n = in.read(b)) != -1) { out.write(b, 0, n); } in.close(); out.close(); ret = out.toByteArray(); } catch (IOException e) { // log.error("helper:get bytes from file process error!"); e.printStackTrace(); } return ret; }

 

 

字节数组转化为文件

http://www.javaeye.com/topic/304982

 

/** * 把字节数组保存为一个文件 * * @param b * @param outputFile * @return */ public static File getFileFromBytes(byte[] b, String outputFile) { File ret = null; BufferedOutputStream stream = null; try { ret = new File(outputFile); FileOutputStream fstream = new FileOutputStream(ret); stream = new BufferedOutputStream(fstream); stream.write(b); } catch (Exception e) { // log.error("helper:get file from byte process error!"); e.printStackTrace(); } finally { if (stream != null) { try { stream.close(); } catch (IOException e) { // log.error("helper:get file from byte process error!"); e.printStackTrace(); } } } return ret; }