java ImageIO 无法将缓冲图像写入文件
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ImageIO is unable to write buffered image to file
提问by JAVAGeek
I am having some problem in writing bufferedimage to jpgfile.
in my method , i am getting a bufferedimageas parameter which i need to write in a file-
我在将缓冲图像写入jpg文件时遇到了一些问题。在我的方法中，我得到一个bufferedimage作为参数，我需要将其写入文件-
here is what i am doing :
这是我在做什么：
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();
}
}
here is what gets printed by buff.toString():
这是打印的内容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
program runs fine without any exception, but the generated jpg file size is 0 bytes
程序运行正常，没有任何异常，但生成的jpg文件大小为 0 bytes
i tried writing image without using ImageIO :
我尝试在不使用 ImageIO 的情况下编写图像：
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;
}
And this works absolutely fine.
这绝对有效。
Why it is not working with ImageIO ?
为什么它不适用于 ImageIO ？
回答by cklab
Remove the .from your format name.
.从格式名称中删除。
ImageIO.write(buff, "jpg", new File(savePath));
