java 文件和byte互转的实例

/** 
  * 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,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(); 
    } 
   } 
  } 
 }