如何将此XML解析到hashmap

Question

如何使用java库解析xml？

Answer 1

下面的程序将把所有XML分解为地图。

它首先从xml ...

构造文档

    DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
    Document doc = dBuilder.parse(new ByteArrayInputStream(XML.getBytes()));

（在这里，XML只是一个字符串常数，包含您提出的所有XML）

您可以获取文档中所有"应用程序"节点的列表...

NodeList applicationNodes = doc.getElementsByTagName("Application");

然后，您将在每个执行以下操作上迭代...

1. 获取应用程序元素的子节点
2. 找到孩子节点的名称和电子邮件
3. 将这些值放在地图中

代码

import java.io.ByteArrayInputStream;
import java.util.HashMap;
import java.util.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class Stack {
    public static void main(String[] args) throws Exception {
        DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
        Document doc = dBuilder.parse(new ByteArrayInputStream(XML.getBytes()));
        Map<String, String> map = readFromDocument(doc);
        for(Map.Entry<String, String> entry : map.entrySet()) {
            System.out.println(entry.getKey() + " = " + entry.getValue());
        }
    }
    private static Map<String, String> readFromDocument(Document doc) {
        Map<String, String> map = new HashMap<>();
        NodeList applicationNodes = doc.getElementsByTagName("Application");
        for(int k = 0; k < applicationNodes.getLength(); k++) {
            Node applicationNode = applicationNodes.item(k);
            NodeList subNodes = applicationNode.getChildNodes();
            String key = null;
            String value = null;
            for(int j = 0; j < subNodes.getLength(); j++) {
                Node node = subNodes.item(j);
                if("Name".equals(node.getNodeName())) {
                    key = node.getTextContent();
                } else if("StatusIO-Email".equals(node.getNodeName())) {
                    value = node.getTextContent();
                }
            }
            if(key == null || value == null) {
                throw new IllegalStateException("Could not find all attributes of node, key=" + key + ", value=" + value);
            }
            map.put(key, value);
        }
        return map;
    }
    private static final String XML = "<?xml version="1.0" encoding="UTF-8"?>" +
            "<Domains>" +
            "    <Domain name="Parts">" +
            "        <Applications>" +
            "            <Application>" +
            "                <Name>Paragon</Name>" +
            "                <StatusIO-Email> [e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>PartsAssistanceCenter</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>PartsPricingFeedback</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "        </Applications>" +
            "    </Domain>" +
            "    <Domain name="Admin">" +
            "        <Applications>" +
            "            <Application>" +
            "                <Name>DealerAgreementSystem</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>DealerFinancialSystem</Name>" +
            "                <StatusIO-Email> [e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>DealerPersonnelMaintencance</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>DealerWebSiteContentManagement</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "        </Applications>" +
            "    </Domain>" +
            "    <Domain name="Sales">" +
            "        <Applications>" +
            "            <Application>" +
            "                <Name>C3RemarketingProgram</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>CARFAX</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>CertificateProgram</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>CompetitorInformation</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>CustomizedDelivery</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>DE1</Name>" +
            "                <StatusIO-Email> [e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>DistributionAndLogistics</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>DistributionandLogistics-Sprinter</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>EuropeanDeliveryProgram</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>ExtendedLimitedWarranty</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>ExtendedLimitedWarrantyVans</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>F&amp;IPro</Name>" +
            "                <StatusIO-Email> [e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>FleetInfo-DealerSite</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>FleetSales-CustomerSite</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>GeographicLinesets</Name>" +
            "                <StatusIO-Email> [e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>KnownExporterSearch</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>ManheimAuctions</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>MarketSupportSystem</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>MBAdvantage</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>MBBusDevCenter</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>mbrace-ElectronicSubscriberAgreement</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>MercedesProgramInfo</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>PrepaidMaintenance</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>PrepaidMaintenanceVans</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>RDAResourceManager</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>VehicleConfigurator</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>VehicleWraps</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "        </Applications>" +
            "    </Domain>" +
            "    <Domain name="Service">" +
            "        <Applications>" +
            "            <Application>" +
            "                <Name>ASRALocal</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>MarketResearchAfterSales</Name>" +
            "                <StatusIO-Email> [e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>MOC1TabletSolutions</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>OperationsGuidelines</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>smartTekInfo</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>smartWarrantyManual</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>SeatProtection</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>ServiceandPartsSalesTools</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>SmallRepair</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>STARTekInfo</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "            <Application>" +
            "                <Name>WarrantyManual</Name>" +
            "                <StatusIO-Email>[e-mail]</StatusIO-Email>" +
            "            </Application>" +
            "        </Applications>" +
            "    </Domain>" +
            "</Domains>"; 
}

输出

MarketResearchAfterSales =  [e-mail]
WarrantyManual = [e-mail]
F&IPro =  [e-mail]
ASRALocal = [e-mail]
MarketSupportSystem = [e-mail]
ExtendedLimitedWarrantyVans = [e-mail]
CustomizedDelivery = [e-mail]
DistributionandLogistics-Sprinter = [e-mail]
MBBusDevCenter = [e-mail]
RDAResourceManager = [e-mail]
OperationsGuidelines = [e-mail]
CertificateProgram = [e-mail]
PrepaidMaintenance = [e-mail]
mbrace-ElectronicSubscriberAgreement = [e-mail]
DealerPersonnelMaintencance = [e-mail]
ServiceandPartsSalesTools = [e-mail]
MBAdvantage = [e-mail]
DealerAgreementSystem = [e-mail]
CARFAX = [e-mail]
smartWarrantyManual = [e-mail]
DealerWebSiteContentManagement = [e-mail]
MOC1TabletSolutions = [e-mail]
PartsAssistanceCenter = [e-mail]
ExtendedLimitedWarranty = [e-mail]
FleetSales-CustomerSite = [e-mail]
ManheimAuctions = [e-mail]
Paragon =  [e-mail]
MercedesProgramInfo = [e-mail]
STARTekInfo = [e-mail]
C3RemarketingProgram = [e-mail]
DE1 =  [e-mail]
EuropeanDeliveryProgram = [e-mail]
PartsPricingFeedback = [e-mail]
SmallRepair = [e-mail]
DistributionAndLogistics = [e-mail]
GeographicLinesets =  [e-mail]
SeatProtection = [e-mail]
FleetInfo-DealerSite = [e-mail]
PrepaidMaintenanceVans = [e-mail]
CompetitorInformation = [e-mail]
DealerFinancialSystem =  [e-mail]
VehicleWraps = [e-mail]
VehicleConfigurator = [e-mail]
smartTekInfo = [e-mail]
KnownExporterSearch = [e-mail]

Answer 2

一种方法可能是使用 XPath获取所有元素 Application，然后每个元素通过在getElementsByTagName返回的第一个元素上调用getTextContent()来获取标签Name和StatusIO-Email的值：

// Parse the data
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(myFile);
// Create the XPath expression
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
XPathExpression expr = xpath.compile("/Domains/Domain/Applications/Application");
// Evaluate the XPath expression to get all elements Application
NodeList nl = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
Map<String, String> map = new HashMap<>();
// For each element Application get the value of Name and StatusIO-Email
for (int i = 0; i < nl.getLength(); i++) {
    // Cast it first as an element
    Element node = (Element) nl.item(i);
    map.put(
        node.getElementsByTagName("Name").item(0).getTextContent(),   
        node.getElementsByTagName("StatusIO-Email").item(0).getTextContent()
    );
}

nb：此代码假设我们在每个元素中始终具有标签 Name和 StatusIO-Email Application，如果不是，则如果存在，则需要先检查每个标签。