Image,File与Byte转换

从byte[]转Image

   1. private static Image createImage(byte[] imageBytes) {  
   2.     Image image = null;  
   3.     try {  
   4.         ByteArrayInputStream bais = new ByteArrayInputStream(imageBytes);  
   5.         image = new Image(null, bais);  
   6.     } catch (Exception e) {  
   7.         e.printStackTrace();  
   8.     }  
   9.     return image;  
  10. }  

从Image转byte[]

   1. public static byte[] getImageBytes(Image image) throws Exception {  
   2.     ByteArrayOutputStream baos = new ByteArrayOutputStream();  
   3.       
   4.     ImageLoader imageLoader = new ImageLoader();  
   5.     imageLoader.data = new ImageData[] { image.getImageData() };  
   6.     imageLoader.save(baos, image.type);  
   7.       
   8.     byte[] imageByteArray = baos.toByteArray();  
   9.     try {  
  10.         baos.close();  
  11.     } catch (Exception e) {  
  12.         e.printStackTrace();  
  13.     }  
  14.   
  15.     return imageByteArray;  
  16. }  

上述摘自http://lggege.iteye.com/blog/263265

从File转byte[]

    public static byte[] getBytesFromFile(File f){
        if (f == null){
            return null;
        }
        try {
            FileInputStream stream = new FileInputStream(f);
            ByteArrayOutputStream out = new ByteArrayOutputStream(1000);
            byte[] b = new byte[1000];
            int n;
            while ((n = stream.read(b)) != -1)
                out.write(b, 0, n);
            stream.close();
            out.close();
            return out.toByteArray();
        } catch (IOException e){
        }
        return null;
    }

从byte[]转file

    public static File getFileFromBytes(byte[] b, String outputFile) ...{
        BufferedOutputStream stream = null;
        File file = null;
        try ...{
            file = new File(outputFile);
            FileOutputStream fstream = new FileOutputStream(file);
            stream = new BufferedOutputStream(fstream);
            stream.write(b);
        } catch (Exception e) ...{
            e.printStackTrace();
        } finally ...{
            if (stream != null) ...{
                try ...{
                    stream.close();
                } catch (IOException e1) ...{
                    e1.printStackTrace();
                }
            }
        }
        return file;
    }

评论

1 楼 ipodao 2017-06-28  

看着不错，mark