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, 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();     }    }   }  }