Java Spring MVC 在浏览器中显示 PDF

如何强制浏览器显示 pdf 而不是下载？ 这是控制器

 @RequestMapping(value = "/preview.pdf", method = RequestMethod.GET)
protected String preivewSection(      
    HttpServletRequest request,
        HttpSession httpSession,
    HttpServletResponse response) {
    try {
        byte[] documentInBytes = getDocument();         
        response.setHeader("Content-Disposition", "inline; filename=\"report.pdf\"");
        response.setDateHeader("Expires", -1);
        response.setContentType("application/pdf");
        response.setContentLength(documentInBytes.length);
        response.getOutputStream().write(documentInBytes);
    } catch (Exception ioe) {
    } finally {
    }
    return null;
}

如果删除此行，pdf 将在浏览器中打开。

response.setHeader("Content-Disposition", "inline; filename=\"report.pdf\"");