[英]Splitting Large XML FIles Java (StAX)
I am using this code https://github.com/koen-serneels/blog/tree/master/BigXmlTest/src/main/java/be/error/bigxmltest from GitHub to split large XML files(6GB).I am starting with the basic XML File provided to understand the program. 我正在使用这段代码https://github.com/koen-serneels/blog/tree/master/BigXmlTest/src/main/java/be/error/bigxmltest来自GitHub来拆分大型XML文件(6GB)。提供基本的XML文件以了解程序。 The program outputs the header for each file that is split.
程序输出每个分割文件的标题。 I am Trying to add a Footer Element now also for each file and having some difficulties, any suggestions or advice on how to go about this would be great.
我现在也尝试为每个文件添加一个页脚元素,并且遇到一些困难,有关如何执行此操作的任何建议或建议都很好。
I have added The footer to the schema and written the code to add a footer in the "openOutputFileAndWriteHeader()" method. 我已经在模式中添加了页脚,并在“ openOutputFileAndWriteHeader()”方法中编写了添加页脚的代码。 However This adds the footer within the Content Element.
但是,这会将页脚添加到Content Element中。 Shown Below:
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;
}
Output: 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>
Name of method openOutputFileAndWriteHeader
hints that it will create new file. 方法名称
openOutputFileAndWriteHeader
暗示它将创建新文件。 It's not proper place for footer. 页脚不合适。
In BigXmlTestIteratorApi.java from line 74 you can see code: 在第74行的BigXmlTestIteratorApi.java中 ,您可以看到代码:
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: 要添加页脚,您需要在关闭文件之前添加一些内容:
writeFooter(footer);
xmlEventWriter.close();
xmlEventWriter = openOutputFileAndWriteHeader(++fileNumber);
dataRepetitions = 0;
Please note that creating instance of FooterType
for each file may be superfluous. 请注意,为每个文件创建
FooterType
实例可能是多余的。 It could be created outside loop, for example at 60 line 可以在外部循环(例如60行)上创建
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