ImageIO无法将缓冲的图像写入文件

Question

我在将bufferedimage写入jpg文件时遇到了一些问题.在我的方法中,我得到一个bufferedimage参数,我需要在文件中写入 -

这就是我在做的事情:

public boolean writeToFile(BufferedImage buff,String savePath) {

        try {

            System.out.println(buff.toString());
            ImageIO.write(buff, ".jpg", new File(savePath));
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        } 
   }

这是印刷品buff.toString():

BufferedImage@8046f4: type = 1 DirectColorModel: rmask=ff0000 gmask=ff00 bmask=ff amask=0 IntegerInterleavedRaster: width = 1024 height = 172 #Bands = 3 xOff = 0 yOff = 0 dataOffset[0] 0

程序运行正常,没有任何异常,但生成的jpg文件大小是 0 bytes

我尝试不使用ImageIO写图像:

public boolean writeToFile(BufferedImage buff,String savePath) {



        try {

            System.out.println("got image : " + buff.toString());
            Iterator iter = ImageIO.getImageWritersByFormatName("jpeg");
            ImageWriter writer = (ImageWriter)iter.next();
            ImageWriteParam iwp = writer.getDefaultWriteParam();


            iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
            iwp.setCompressionQuality(.5f); 


            File file = new File(savePath);
            FileImageOutputStream output = new FileImageOutputStream(file);
            writer.setOutput(output);
            IIOImage image = new IIOImage(buff, null, null);
            writer.write(null, image, iwp);
            writer.dispose();

            return true;
        } catch (Exception e) {
             e.printStackTrace();
        }

        return false;
    }

这个工作绝对没问题.

为何不使用ImageIO？

Answer 1

.从格式名称中删除.

ImageIO.write(buff, "jpg", new File(savePath));