java - 使用流避免临时文件

Question

我正在尝试使用 Apache Library FOP 创建 PDF 文档。它运行良好，但我必须创建一个临时文件来存储中间文件(test.fop)。

这是我的功能:

@RequestMapping(value = "/pdf")
public void showPdfReport(OutputStream pdfOutStream) throws Exception
{
    // Setup
    FopFactory fopFactory = FopFactory.newInstance();
    TransformerFactory factory = TransformerFactory.newInstance();

    // Transformation XML to XML-FO
    StreamSource xsltSource = new StreamSource(servletContext.getResourceAsStream("resources/xsl/pdfTemplate.fo"));
    Transformer transformer = factory.newTransformer(xsltSource);
    OutputStream fopOutStream = new BufferedOutputStream(new FileOutputStream(new File(
            "C:/Temp/tests/test.fop")));
    StreamSource xmlSource = new StreamSource(servletContext.getResourceAsStream("resources/xsl/test.xml"));
    StreamResult fopResult = new StreamResult(fopOutStream);
    transformer.transform(xmlSource, fopResult);

    //  Transformation XSL-FO to PDF
    Source fopSrc = new StreamSource(new File("C:/Temp/tests/test.fop"));
    Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, pdfOutStream);
    Result res = new SAXResult(fop.getDefaultHandler());
    transformer = factory.newTransformer();
    transformer.transform(fopSrc, res);
}

是否可以将 test.fop 存储在流或任何缓冲区中而不是文件中？

Answer 1

有一个 example FOP 网站对此进行了准确解释。从 XSLT 转换发出的 SAX 事件直接送入 FOP。文件或内存中没有缓冲。