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我正在使用来自 GitHub 的代码https://github.com/koen-serneels/blog/tree/master/BigXmlTest/src/main/java/be/error/bigxmltest来拆分大型 XML 文件（6GB）。我开始使用提供的基本 XML 文件来理解程序。程序为每个拆分的文件输出标题。我现在也正在尝试为每个文件添加页脚元素并且遇到一些困难，任何关于如何进行此操作的建议或建议都会很棒。

我已将页脚添加到架构中，并编写了代码以在“openOutputFileAndWriteHeader()”方法中添加页脚。但是，这会在内容元素中添加页脚。如下图所示：

private XMLEventWriter openOutputFileAndWriteHeader(int fileNumber) throws Exception
{

    XMLEventFactory xmlEventFactory = XMLEventFactory.newInstance();
    XMLOutputFactory xmlOutputFactory = XMLOutputFactory.newInstance();
    xmlOutputFactory.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, true);
    XMLEventWriter writer = xmlOutputFactory.createXMLEventWriter(new FileOutputStream(new File("C:\\Users\\thamm\\Desktop\\SplitFiles\\File_" + fileNumber + ".xml")));

    writer.setDefaultNamespace(DOCUMENT_NS);
    writer.add(xmlEventFactory.createStartDocument());

    writer.add(xmlEventFactory.createStartElement(new QName(DOCUMENT_NS, ROOT_ELEMENT), null, null));

    HeaderType header = objectFactory.createHeaderType();
    header.setSomeHeaderElement("List of Employees");
    marshaller.marshal(new JAXBElement<HeaderType>(new QName(DOCUMENT_NS, HEADER_ELEMENT, ""), HeaderType.class, 
                    HeaderType.class, header), writer);

    writer.add(new StartElementEvent(new QName(DOCUMENT_NS, CONTENT_ELEMENT)));

    FooterType footer = objectFactory.createFooterType();
    footer.setSomeFooterElement("Footer");
    marshaller.marshal(new JAXBElement<FooterType>(new QName(DOCUMENT_NS, FOOTER_ELEMENT,""), FooterType.class, 
                      FooterType.class, footer), writer);

    return writer;
}

输出：

<?xml version='1.0' encoding='UTF-8'?>
<BigXmlTest xmlns="http://www.sidero.ie/bigxmltest">
    <Header>
        <SomeHeaderElement>List of Employees</SomeHeaderElement>
    </Header>
    <Content>
        <Footer>
            <SomeFooterElement>Footer</SomeFooterElement>
        </Footer>
        <Data>Data4</Data>
        <Data>Data5</Data>
        <Data>Data6</Data>
    </Content>
</BigXmlTest>
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1 回答 1

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Name of method openOutputFileAndWriteHeader hints that it will create new file. It's not proper place for footer.

In BigXmlTestIteratorApi.java from line 74 you can see code:

xmlEventWriter.close(); // Also closes any open Element(s) and the document
xmlEventWriter = openOutputFileAndWriteHeader(++fileNumber); // Continue with next file
dataRepetitions = 0;

To add footer, you need add something before closing file:

writeFooter(footer);
xmlEventWriter.close(); 
xmlEventWriter = openOutputFileAndWriteHeader(++fileNumber);
dataRepetitions = 0;

Please note that creating instance of FooterType for each file may be superfluous. It could be created outside loop, for example at 60 line

于 2017-03-30T11:24:34.753 回答