有更快的方法输出PDF文件吗？

Question

这是一段将PDF文件输出到浏览器的代码,它可以更快吗？
这是在Java servlet中实现的.

private ByteArrayOutputStream getByteArrayOutputStreamFromFile(File file) throws Exception {
        BufferedInputStream bis = null;
        ByteArrayOutputStream bos = null;
        try {
            bis = new BufferedInputStream(new FileInputStream(file));
            bos = new ByteArrayOutputStream();
            byte[] byteContent = new byte[1024 * 1024];
            int len = 0;
            while ((len = bis.read(byteContent)) != -1) {
                bos.write(byteContent, 0, len);
            }
            return bos;
        } catch (Exception ex) {
            throw ex;
        } finally {
            if (bis != null) {
                bis.close();
            }
            if (bos != null) {
                bos.close();
            }
        }
    }

Answer 1

 response.setContentType("application/pdf");
 ServletContext ctx = getServletContext();
 InputStream is = ctx.getResourceAsStream("/erp.pdf");

 int read =0;
 byte[] bytes = new byte[1024];
 OutputStream os = response.getOutputStream();
 while((read = is.read(bytes)) != -1)
 {
 os.write(bytes, 0, read);
 }
 os.flush();
 os.close();

Answer 2

使用Google Guava,您可以在一行中对此进行汇总:

import com.google.common.io.Files;

private OutputStream getOutputStream(File file) throws IOException {
    return Files.newOutputStreamSupplier(file).getOutput();
}