转载自   Java 文件和byte数组转换

/** * 获得指定文件的byte数组 */  private byte[] getBytes(String filePath){  byte[] buffer = null;  try {  File file = new File(filePath);  FileInputStream fis = new FileInputStream(file);  ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);  byte[] b = new byte[1000];  int n;  while ((n = fis.read(b)) != -1) {  bos.write(b, 0, n);  }  fis.close();  bos.close();  buffer = bos.toByteArray();  } catch (FileNotFoundException e) {  e.printStackTrace();  } catch (IOException e) {  e.printStackTrace();  }  return buffer;  }/** * 根据byte数组，生成文件 */  public static void getFile(byte[] bfile, String filePath,String fileName) {  BufferedOutputStream bos = null;  FileOutputStream fos = null;  File file = null;  try {  File dir = new File(filePath);  if(!dir.exists()&&dir.isDirectory()){//判断文件目录是否存在  dir.mkdirs();  }  file = new File(filePath+"\\"+fileName);  fos = new FileOutputStream(file);  bos = new BufferedOutputStream(fos);  bos.write(bfile);  } catch (Exception e) {  e.printStackTrace();  } finally {  if (bos != null) {  try {  bos.close();  } catch (IOException e1) {  e1.printStackTrace();  }  }  if (fos != null) {  try {  fos.close();  } catch (IOException e1) {  e1.printStackTrace();  }  }  }  }