如何使用java将一个XML文件拆分成多个XML文件 [英] how to split an XML file into multiple XML files using java

问题描述

我是第一次在 Java 中使用 XML 文件，我需要一些帮助.我正在尝试使用 Java 将一个 XML 文件拆分为多个 XML 文件

I'm using XML files in Java for the first time and i need some help. I am trying to split an XML file to multiple XML files using Java

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<products>
    <product>
        <description>Sony 54.6" (Diag) Xbr Hx929 Internet Tv</description>
        <gtin>00027242816657</gtin>
        <price>2999.99</price>
        <orderId>2343</orderId>
        <supplier>Sony</supplier>
    </product>
    <product>
        <description>Apple iPad 2 with Wi-Fi 16GB - iOS 5 - Black
        </description>
        <gtin>00885909464517</gtin>
        <price>399.0</price>
        <orderId>2343</orderId>
        <supplier>Apple</supplier>
    </product>
    <product>
        <description>Sony NWZ-E464 8GB E Series Walkman Video MP3 Player Blue
        </description>
        <gtin>00027242831438</gtin>
        <price>91.99</price>
        <orderId>2343</orderId>
        <supplier>Sony</supplier>
    </product>
    <product>
        <description>Apple MacBook Air A 11.6" Mac OS X v10.7 Lion MacBook
        </description>
        <gtin>00885909464043</gtin>
        <price>1149.0</price>
        <orderId>2344</orderId>
        <supplier>Apple</supplier>
    </product>
    <product>
        <description>Panasonic TC-L47E50 47" Smart TV Viera E50 Series LED
            HDTV</description>
        <gtin>00885170076471</gtin>
        <price>999.99</price>
        <orderId>2344</orderId>
        <supplier>Panasonic</supplier>
    </product>
</products>

我正在尝试获取三个 XML 文档，例如:

and I'm trying to get three XML documents like:

 <?xml version="1.0" encoding="UTF-8"?>
<products>
        <product>
            <description>Sony 54.6" (Diag) Xbr Hx929 Internet Tv</description>
            <gtin>00027242816657</gtin>
            <price currency="USD">2999.99</price>
            <orderid>2343</orderid>
        </product>
        <product>
            <description>Sony NWZ-E464 8GB E Series Walkman Video MP3 Player Blue</description>
            <gtin>00027242831438</gtin>
            <price currency="USD">91.99</price>
            <orderid>2343</orderid>
        </product>
</products>

每个供应商一个.我怎样才能收到它?对此的任何帮助都会很棒.

one for each supplier. How can I receive it? Any help on this will be great.

推荐答案

确保将inputFile"中的路径更改为您的文件以及输出部分:

Make sure you change the path in "inputFile" to your file and also the output part:

StreamResult result = new StreamResult(new File("C:\xmls\" + supplier.trim() + ".xml"));

这是您的代码.

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class ExtractXml
{
    /**
     * @param args
     */
    public static void main(String[] args) throws Exception
    {
        String inputFile = "resources/products.xml";

        File xmlFile = new File(inputFile);
        DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
        Document doc = dBuilder.parse(xmlFile);

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        factory.setNamespaceAware(true); // never forget this!

        XPathFactory xfactory = XPathFactory.newInstance();
        XPath xpath = xfactory.newXPath();
        XPathExpression allProductsExpression = xpath.compile("//product/supplier/text()");
        NodeList productNodes = (NodeList) allProductsExpression.evaluate(doc, XPathConstants.NODESET);

        //Save all the products
        List<String> suppliers = new ArrayList<String>();
        for (int i=0; i<productNodes.getLength(); ++i)
        {
            Node productName = productNodes.item(i);

            System.out.println(productName.getTextContent());
            suppliers.add(productName.getTextContent());
        }

        //Now we create the split XMLs

        for (String supplier : suppliers)
        {
            String xpathQuery = "/products/product[supplier='" + supplier + "']";

            xpath = xfactory.newXPath();
            XPathExpression query = xpath.compile(xpathQuery);
            NodeList productNodesFiltered = (NodeList) query.evaluate(doc, XPathConstants.NODESET);

            System.out.println("Found " + productNodesFiltered.getLength() + 
                               " product(s) for supplier " + supplier);

            //We store the new XML file in supplierName.xml e.g. Sony.xml
            Document suppXml = dBuilder.newDocument();

            //we have to recreate the root node <products>
            Element root = suppXml.createElement("products"); 
            suppXml.appendChild(root);
            for (int i=0; i<productNodesFiltered.getLength(); ++i)
            {
                Node productNode = productNodesFiltered.item(i);

                //we append a product (cloned) to the new file
                Node clonedNode = productNode.cloneNode(true);
                suppXml.adoptNode(clonedNode); //We adopt the orphan :)
                root.appendChild(clonedNode);
            }

            //At the end, we save the file XML on disk
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            DOMSource source = new DOMSource(suppXml);

            StreamResult result =  new StreamResult(new File("resources/" + supplier.trim() + ".xml"));
            transformer.transform(source, result);

            System.out.println("Done for " + supplier);
        }
    }

}

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