Question

我正在使用这种方法来获取文件

@GetMapping(value = "/test", produces = MediaType.APPLICATION_PDF_VALUE)
public String test() throws FOPException, IOException { 

    SisDocuments document = documentRepository.getOne(Long.valueOf("801859"));

    documentService.constructDocumentById(document);        


    return "/connexion";
}

@Override
public void constructDocumentById(SisDocuments document) {

    try {

        File inputFile = new File("input.txt");

        File xsltfile = new File(path + "dz/sis-fop.xsl");
        FopFactory fopFactory = FopFactory.newInstance();
        FOUserAgent foUserAgent = fopFactory.newFOUserAgent();

        ByteArrayOutputStream bout = new ByteArrayOutputStream();


        OutputStream out;
        out = new java.io.FileOutputStream("employee.pdf");

        try {
            Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, out);

            TransformerFactory factory = TransformerFactory.newInstance();
            Source xslt = new StreamSource(xsltfile);
            Transformer transformer = factory.newTransformer(xslt);

            File fXmlFile = new File(path +  "dz/my-file.xml");
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
            Document doc = dBuilder.parse(fXmlFile);

            Result res = new SAXResult(fop.getDefaultHandler());

            DOMSource source = new DOMSource(doc);

            transformer.transform(source, res);



        } finally {
        }

    } catch (Exception e) {
        System.err.println(" r " + e.getMessage());
        e.printStackTrace();
    }

}

此方法是在我的项目目录中创建一个文件，而不是创建一个我要下载的文件

Answer 1

典型的方法是将文件获取为InputStream并将其写入OutputStream的{{1}}

Response

Answer 2

您的控制器方法不得返回String，实际上，它必须不返回任何内容:) 要流式传输文件，您必须直接在javax.servlet.http.HttpServletResponse - outputstream中编写内容，例如：

HttpServletResponse response;
Files.copy( yourPath, response.getOutputStream() );

从Outputstream下载PDF文件

2 个答案: