Question

我正在尝试将静态pdf（在系统上）发送到outputStream，以便显示另存为对话框。但是当打开Pdf时，只显示一个空页面：

这是应该显示对话框的代码：

    //get the pdf:
    String pathToPdf = servletContext.getRealPath("/pdfFiles/dealer.pdf");
    File pdfFile = new File (pathToPdf);

    response.setContentType("application/pdf");
    response.addHeader("Content-Disposition", "attachment; filename=dealer.pdf");
    response.setContentLength((int) pdfFile.length());

    FileInputStream fileInputStream = new FileInputStream(pdfFile);
    OutputStream responseOutputStream = response.getOutputStream();
    int bytes;
    while ((bytes = fileInputStream.read()) != -1) {
        responseOutputStream.write(bytes);
        }
    responseOutputStream.flush();
    responseOutputStream.close();

Stacktrace说明如下：

WARNING: Invalid HTML; bare lessthan sign found at line 4. Surroundings: '<
/Creator (Apache FOP Version'.
WARNING: Invalid HTML; bare lessthan sign found at line 5. Surroundings: '/Creator (Apache FOP Version 1'.
WARNING: Invalid HTML; bare lessthan sign found at line 11. Surroundings: '<
  /N 3
  /Length 11 0 R
  /F'.
WARNING: Invalid HTML; bare lessthan sign found at line 12. Surroundings: '/N 3
  /Length 11 0 R
  /Filte'.
WARNING: Invalid HTML; bare lessthan sign found at line 18. Surroundings: '?s??e???'?9???`??2?&c?tI?'.
WARNING: Invalid tag found: unexpected input while looking for attr name or '/>' at line 25. Surroundings: '?+?U?Zp'pWp?????????e?F|'.
WARNING: Invalid HTML; bare lessthan sign found at line 68. Surroundings: '<
  /Name /Im1
  /Type /XObjec'.
WARNING: Invalid HTML; bare lessthan sign found at line 69. Surroundings: '/Name /Im1
  /Type /XObject
  '.
WARNING: Invalid tag found: unexpected input while looking for attr name or '/>' at line 85. Surroundings: '??r??"?F?t??$??n{?q??O~??{?'.

有谁可以说我错过了什么或做错了什么？谢谢！

Answer 1

您应该尝试拨打

response.reset();

在设置内容类型之前。也许图书馆已经设置了标题，不同的标题会发生冲突。

Answer 2

我必须添加以下内容：

context.responseComplete();

所以完整的代码现在看起来像这样：

response.setContentType("application/pdf");
            response.setHeader("Content-Disposition", "attachment; filename=\"PdfName.pdf\"");
            response.setContentLength(outStream.size());

            OutputStream responseOutputStream = response.getOutputStream();
            outStream.writeTo(responseOutputStream);

            responseOutputStream.flush();
            responseOutputStream.close();
            context.responseComplete();

通过Servlet的OutputStream破坏pdf

2 个答案: