byte数组和文件的相互转换

 1     /**
 2      * 获得指定文件的byte数组
 3      */
 4
 5     private byte[] getBytes(String filePath){
 6         byte[] buffer = null;
 7         try {
 8             File file = new File(filePath);
 9             FileInputStream fis = new FileInputStream(file);
10             ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
11             byte[] b = new byte[1000];
12             int n;
13             while ((n = fis.read(b)) != -1) {
14                 bos.write(b, 0, n);
15             }
16             fis.close();
17             bos.close();
18             buffer = bos.toByteArray();
19         } catch (FileNotFoundException e) {
20             e.printStackTrace();
21         } catch (IOException e) {
22             e.printStackTrace();
23         }
24         return buffer;
25     }

 1     /**
 2      * 根据byte数组，生成文件
 3      */
 4     public static void getFile(byte[] bfile, String filePath,String fileName) {
 5         BufferedOutputStream bos = null;
 6         FileOutputStream fos = null;
 7         File file = null;
 8         try {
 9             File dir = new File(filePath);
10             if(!dir.exists()&&dir.isDirectory()){//判断文件目录是否存在
11                 dir.mkdirs();
12             }
13             file = new File(filePath+"\\"+fileName);
14             fos = new FileOutputStream(file);
15             bos = new BufferedOutputStream(fos);
16             bos.write(bfile);
17         } catch (Exception e) {
18             e.printStackTrace();
19         } finally {
20             if (bos != null) {
21                 try {
22                     bos.close();
23                 } catch (IOException e1) {
24                     e1.printStackTrace();
25                 }
26             }
27             if (fos != null) {
28                 try {
29                     fos.close();
30                 } catch (IOException e1) {
31                     e1.printStackTrace();
32                 }
33             }
34         }
35     }