byte数组与File文件之间的转换

ゝ一世哀愁。 2024-03-27 11:22 112阅读 0赞

提供了一个工具类，保存下来让有需要的人参考：

> public class FileUtil \{  
> /\*\*  
> \* file转byte  
> \*/  
> public static byte\[\] file2byte(File file)\{  
> byte\[\] buffer = null;  
> try\{  
> FileInputStream fis = new FileInputStream(file);  
> ByteArrayOutputStream bos = new ByteArrayOutputStream();  
> byte\[\] b = new byte\[1024\];  
> 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;  
> \}  
>   
> /\*\*  
> \* byte 转file  
> \*/  
> public static File byte2File(byte\[\] buf, String filePath, String fileName)\{  
> BufferedOutputStream bos = null;  
> FileOutputStream fos = null;  
> File file = null;  
> try\{  
> File dir = new File(filePath);  
> if (!dir.exists() && dir.isDirectory())\{  
> dir.mkdirs();  
> \}  
> file = new File(filePath + File.separator + fileName);  
> fos = new FileOutputStream(file);  
> bos = new BufferedOutputStream(fos);  
> bos.write(buf);  
> \}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();  
> \}  
> \}  
> \}  
> return file;  
> \}  
> /\*\*  
> \* multipartFile转File  
> \*\*/  
> public static File multipartFile2File(MultipartFile multipartFile)\{  
> File file = null;  
> if (multipartFile != null)\{  
> try \{  
> file=File.createTempFile("tmp", null);  
> multipartFile.transferTo(file);  
> System.gc();  
> file.deleteOnExit();  
> \}catch (Exception e)\{  
> e.printStackTrace();  
> log.warn("multipartFile转File发生异常："+e);  
> \}  
> \}  
> return file;  
> \}  
> \}