通过Servlet读pdf文件

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        response.setContentType("application/pdf");        InputStream in = this.getServletContext().getResourceAsStream("/WEB-INF/note.pdf");        OutputStream out = response.getOutputStream();        byte[] buffer = new byte[1024];        int length = -1;        while((length = in.read(buffer)) != -1 ) {            out.write(buffer, 0, length);        }    }