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？在创建和上传PDF之前，我曾问过similar question。

感谢。

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。”并且setFile方法需要java.io.File，GAE / J setFile（java.io.File文件，java.lang.String mimeType）不接受它。有没有我可以上传的解决方案而不存储数据。我需要java.io.File类型作为setFile（）方法的参数。我尝试过使用gaevfs（http://code.google.com/p/gaevfs/)+appengine-java-io(http://code.google.com/p/appengine-java-io/)但是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GData API for Documents。您可以找到有关API本身的信息here（特别是关于Uploading Documents的部分），this link将有助于将其设置为在Google App Engine中使用。

Answer 2

感谢Nick Johnson，我找到了在GAE / J上传PDF的方法。我不知道PdfEntry的方法setMediaSource（）。至少我发现的例子和任何代码。我已经尝试了几乎每个例子，解决方案，但最后我找到了另一个代码，同时寻找其他东西。如果其他人需要它，答案如下。大多数代码是PDF生成，取自pdfjet的样本webpage谢谢大家的帮助。

        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);

在GAE / J上创建文件并上传到Google文档

2 个答案: