我正在构建一个小型图像缩放工具,用户首先将图像上传到网页,并在提交该表单时显示放大的图像以供保存。但是,当用户发送请求使用不同的宽度和高度参数对同一图像进行缩放时,问题就出现了。在这种情况下,我在 servlet 中设置的内容处置 header 似乎不起作用,第二个请求后的图像仅使用 servlet 的类名发送,而不是我在内容处置中提到的文件名和扩展名标题。
response.setContentType("image/jpeg");
response.setHeader("Content-disposition","inline;filename="+filename);
我也尝试在编写器本身中对其进行硬编码,但我使用的那个似乎没有任何文件名参数
private void doDownload(HttpServletResponse resp, BufferedImage bump,
InputStream filecontent) throws IOException {
//http://stackoverflow.com/questions/9340569/jpeg-image-with-wrong-colors
OutputStream out = resp.getOutputStream();
Iterator<ImageWriter> iter = ImageIO
.getImageWritersByMIMEType("image/jpeg");
ImageWriter writer = iter.next();
ImageWriteParam iwp = writer.getDefaultWriteParam();
iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
iwp.setCompressionQuality(1);
ImageOutputStream imgOut = new MemoryCacheImageOutputStream(out);
writer.setOutput(imgOut);
IIOImage image = new IIOImage(bump, null, null);
writer.write(null, image, iwp);
out.flush();
out.close();
writer.dispose();
}
有什么方法可以在将图像写入输出流时设置图像的文件名?
最佳答案
在此类中声明一个静态整数变量。
private static int fileno=0;
private void doDownload(HttpServletResponse resp, BufferedImage bump,
InputStream filecontent) throws IOException {
Iterator iter = ImageIO.getImageWritersByFormatName("jpeg");
ImageWriter writer = (ImageWriter)iter.next();
ImageWriteParam iwp = writer.getDefaultWriteParam();
iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
iwp.setCompressionQuality(1);
String OUTPUTFILE = "C:/Users/Harish/Desktop/jpegFile"+fileno++;
File file = new File(OUTPUTFILE);
//Your fileName will be jpegFile0; and next time jpegFile1 and so on.
FileImageOutputStream imgOut = new FileImageOutputStream(file);
writer.setOutput(imgOut);
IIOImage image = new IIOImage(bump, null, null);
writer.write(null, image, iwp);
writer.dispose();
}
关于java - 内容 - 处置 header 无法正常工作,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13953004/