在 GAE/J 上创建文件并上传到 Google 文档

Question

是否可以在 GAE/J 上创建任何类型的文件并上传到 google 文档？我问过类似关于创建和上传 PDF 的问题。

谢谢。

更新

根据 Google Docs API “要将文档上传到服务器，您可以使用 setFile() 方法将文件附加到新的 DocumentListEntry。”。 setFile 方法需要 java.io.File，GAE/J setFile(java.io.File file, java.lang.String mimeType) 不接受该文件。有没有一种解决方案可以在不存储数据的情况下上传。我需要 java.io.File 类型作为 setFile() 方法工作的参数。我尝试过使用 gaevfs(http://code.google.com/p/gaevfs/)+appengine-java-io(http://code.google.com/p/appengine-java-io /) 但 appengine-java-io 中的 File 类型与 setFile() 方法中使用的 File 类型不匹配。

Answer 1

您想要使用文档的 GData API。您可以在此处找到有关 API 本身的信息（特别是关于上传文档）和此链接有助于将其设置为在 Google App Engine 中运行。

Answer 2

感谢 Nick Johnson，我找到了在 GAE/J 上上传 PDF 的方法。我不知道 PdfEntry 的 setMediaSource() 方法。至少是我找到的示例或任何代码。我尝试了几乎所有示例、解决方案，但最后我在寻找其他内容时找到了另一个代码。如果其他人需要它，答案如下。大部分代码是 PDF 生成，取自 pdfjet 网页 的示例，谢谢大家帮忙。

        ByteArrayOutputStream os = new ByteArrayOutputStream();
        PDF pdf = new PDF(os);
        Font f1 = new Font(pdf, "Helvetica");
        Font f2 = new Font(pdf, "Helvetica-Bold");
        Font f3 = new Font(pdf, "Helvetica-Bold");
        pdf.setTitle("Using TextColumn and Paragraph classes");
        pdf.setSubject("Examples");
        pdf.setAuthor("Innovatics Inc.");
        Page page = new Page(pdf, Letter.PORTRAIT);
        f1.setSize(12);
        f2.setSize(16);
        f3.setSize(14);
        TextColumn column = new TextColumn(f1);
        Paragraph p1 = new Paragraph();
        p1.setAlignment(Align.CENTER);
        p1.add(new TextLine(f2, "Switzerland"));
        Paragraph p2 = new Paragraph();
        p2.add(new TextLine(f2, "Introduction"));
        Paragraph p3 = new Paragraph();
        p3.setAlignment(Align.JUSTIFY);
        TextLine text = new TextLine(f2);
        text.setText("The Swiss Confederation was founded in 1291 as a defensive alliance among three cantons. In succeeding years, other localities joined the original three. The Swiss Confederation secured its independence from the Holy Roman Empire in 1499. Switzerland's sovereignty and neutrality have long been honored by the major European powers, and the country was not involved in either of the two World Wars. The political and economic integration of Europe over the past half century, as well as Switzerland's role in many UN and international organizations, has strengthened Switzerland's ties with its neighbors. However, the country did not officially become a UN member until 2002. Switzerland remains active in many UN and international organizations but retains a strong commitment to neutrality.");
        text.setFont(f1);
        p3.add(text);
        Paragraph p4 = new Paragraph();
        p4.add(new TextLine(f3, "Economy"));
        Paragraph p5 = new Paragraph();
        p5.setAlignment(Align.JUSTIFY);
        text = new TextLine(f1);
        text.setText("Switzerland is a peaceful, prosperous, and stable modern market economy with low unemployment, a highly skilled labor force, and a per capita GDP larger than that of the big Western European economies. The Swiss in recent years have brought their economic practices largely into conformity with the EU's to enhance their international competitiveness. Switzerland remains a safehaven for investors, because it has maintained a degree of bank secrecy and has kept up the franc's long-term external value. Reflecting the anemic economic conditions of Europe, GDP growth stagnated during the 2001-03 period, improved during 2004-05 to 1.8% annually and to 2.9% in 2006. Even so, unemployment has remained at less than half the EU average.");
        p5.add(text);
        Paragraph p6 = new Paragraph();
        p6.setAlignment(Align.RIGHT);
        text = new TextLine(f1);
        text.setColor(RGB.BLUE);
        text.setText("Source: The world fact book.");
        text.setURIAction("https://www.cia.gov/library/publications/the-world-factbook/geos/sz.html");
        p6.add(text);
        column.addParagraph(p1);
        column.addParagraph(p2);
        column.addParagraph(p3);
        column.addParagraph(p4);
        column.addParagraph(p5);
        column.addParagraph(p6);
        column.setPosition(90, 300);
        column.setSize(470, 100);
        column.drawOn(page);
        pdf.flush();
        docsService.setOAuthCredentials(getOAuthParams(), new OAuthHmacSha1Signer());
        URL feedUrl = new URL("https://docs.google.com/feeds/default/private/full/"+folderID+"/contents?xoauth_requestor_id="+user.getEmail());
        PdfEntry newDocument = new PdfEntry();
        newDocument.setCanEdit(true); 
        newDocument.setTitle(new PlainTextConstruct("Sample Report"));
        newDocument.setMediaSource(new MediaByteArraySource(os.toByteArray(), "application/pdf"));
        docsService.insert(feedUrl, newDocument);