Java：保存上传的png图像
当我保存用户上传的 png 文件时遇到问题。它失去了透明度。这是我保存它的方法。
ServletFileUpload upload = new ServletFileUpload(factory);
ProgressListenerImpl listener = new ProgressListenerImpl();
UploadProgressBar uop = new UploadProgressBar(listener);
List<FileItem> fileItemsList = upload.parseRequest(request);
for(FileItem fi : fileItemsList) {
///get name etc.
File fNew= new File(fileLocation, justName);
fi.write(fNew);
}
它设置了黑色背景。还有其他方法可以将其另存为 png 吗？
I am having issue when i save a png file uploaded by user . It loses its transparency . Here is how I save it .
ServletFileUpload upload = new ServletFileUpload(factory);
ProgressListenerImpl listener = new ProgressListenerImpl();
UploadProgressBar uop = new UploadProgressBar(listener);
List<FileItem> fileItemsList = upload.parseRequest(request);
for(FileItem fi : fileItemsList) {
///get name etc.
File fNew= new File(fileLocation, justName);
fi.write(fNew);
}
it puts a black background . Any other way to save it as png ?
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如果您要在服务器端创建 BufferedImage，请确保将其创建为支持 alpha 通道的类型，例如
Paul
If you're creating a BufferedImage on the server side, make sure you create it as a type that supports the alpha channel, e.g.
Paul