JAVA中文件与Byte数组相互转换的方法

　　JAVA中文件与Byte数组相互转换的方法，如下：

 public class FileUtil {

     //将文件转换成Byte数组
     public static byte[] getBytesByFile(String pathStr) {
         File file = new File(pathStr);
         try {
             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();
             byte[] data = bos.toByteArray();
             bos.close();
             return data;
         } catch (Exception e) {
             e.printStackTrace();
         }
         return null;
     }

     //将Byte数组转换成文件
     public static void getFileByBytes(byte[] bytes, 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(bytes);
         } catch (Exception e) {
             e.printStackTrace();
         } finally {
             if (bos != null) {
                 try {
                     bos.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
             if (fos != null) {
                 try {
                     fos.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
     }
 }