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     }