内容处置附件无效-在屏幕上打印位

response.setHeader(\"Content-Disposition\", \"attachment;filename=file.pdf\");

%PDF-1.4 28 0 obj << /Type /XObject /Subtype /Image /Filter /DCTDecode /Length 7746 /Width 200 /Height 123 /BitsPerComponent 8 /ColorSpace /DeviceRGB >>...(cut)

try {
    URL fileUrl = new URL(\"file:///\" + filePath);
    URLConnection connection = fileUrl.openConnection();
    inputStream = connection.getInputStream();
    int fileLength = connection.getContentLength();
    byte[] outputStreamBytes = new byte[100000];
    response.setContentType(\"application/pdf\");
    response.setHeader(\"Content-Disposition\", \"attachment;filename=file.pdf\");
    response.setContentLength(fileLength);
    outputStream = response.getOutputStream();
    int iR;
    while ((iR = inputStream.read(outputStreamBytes)) > 0) {
        outputStream.write(outputStreamBytes, 0, iR);
    }

    return null;
} catch (MalformedURLException e) {
    logger.debug(\"service\", \"An error occured while creating URL object for url: \"
        + filePath);
    response.sendError(HttpServletResponse.SC_NOT_FOUND);
    return null;
} catch (IOException e) {
    logger.debug(\"service\", \"An error occured while opening connection for url: \"
        + filePath);
    response.sendError(HttpServletResponse.SC_NOT_FOUND);
    return null;
} finally {
    if (outputStream != null) {
        outputStream.close();
    }
    if (inputStream != null) {
        inputStream.close();
    }
    inputStream.close();
}
return null;