ImageIO 生成的 JPEG 图像可以在 Windows 文件资源管理器以及 safari 网络浏览器上正确查看，但在 FireFox 中，重新采样的图像会被剪裁。
如何使用 ImageIO 而不破坏重新采样？
代码应该调整图像大小并保持纵横比，并进行 jpeg 压缩，将其转换为可以写入套接字的字节 [] 数组。
我的一些代码。在此代码片段中，我尝试添加 Jui 库，但仍然存在同样的问题。
public static BufferedImage imageistream;
public void Resample(String child,double width,double height) throws Exception, InvalidFileStructureException, InvalidImageIndexException, UnsupportedTypeException, MissingParameterException, WrongParameterException
{
String imagePath = "";
if(this.is_mac_unix == true)
{
imagePath = this.path+"/"+child;
}
else
{
imagePath = this.path+"\\"+child;
}
PixelImage bmp = null;
try {
bmp = ToolkitLoader.loadViaToolkitOrCodecs(imagePath, true, null);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Resample resample = new Resample();
resample.setInputImage(bmp);
double fixedRatio = width/height;
if(((double)bmp.getWidth()/bmp.getHeight()) >= fixedRatio)
{
resample.setSize((int)width,(int)(bmp.getHeight()/(bmp.getWidth()/width)));
}
else
{
resample.setSize((int)width,(int)(bmp.getWidth()/(bmp.getHeight()/height)));
}
resample.setFilter(Resample.FILTER_TYPE_LANCZOS3);
resample.process();
PixelImage scaledImage = resample.getOutputImage();
Processor.imageistream = ImageCreator.convertToAwtBufferedImage(scaledImage);
bmp = null;
Runtime rt = Runtime.getRuntime();
rt.gc();
}
...
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
ImageIO.write(Processor.imageistream, "jpg", baos);
// ImageIO.write(Processor.imageistream, "png", baos); Works!
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
byte bytes[] = baos.toByteArray();
ByteArrayInputStream is = new ByteArrayInputStream(bytes);
OutputStream os = (OutputStream)obj[1];
OutputStreamWriter writer = (OutputStreamWriter)obj[0];
byte[] buf= new byte[4096];
int c;
try {
while (true) {
c= is.read(buf);
if (c<= 0) break;
os.write(buf, 0, c);
}
writer.close();
os.close();
is.close();
最佳答案
我已经成功使用:
BufferedImage bufferedImage = ImageIO.read(..);
Image img = bufferedImage.getScaledInstance(..);
BufferedImage result = // transform Image to BufferedImage
ImageIO.write(result, "image/jpeg", response.getOutputStream());
转换只是将图像的内容写入新的BufferedImage
关于java - 使用 java imageIO 重新采样时 jpeg 被损坏，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2213681/