XML 读取包含特定值的子项 -Java

Question

我在获取某些特定元素时遇到问题，我有一个 xml 文件，该文件的根节点 "problem" 包含子节点 "solutions"。在解决方案中，我的标签名称 "cost" 的值为 505.9208295302417，我想获取此子项中包含 505.9208295302417 的所有元素。到目前为止我所做的就是我只想要这个特定子元素而不是其他元素的所有节点。下面是 xml 和 java 代码。

      <problem>    
      <solution>
      <cost>505.9214355631349</cost>
                   <routes>
                        <route>
                             <driverId>noDriver</driverId>
                             <vehicleId>1_1</vehicleId>
                             <start>0.0</start>
                             <act type="service">
                                  <serviceId>5 </serviceId>
                                  <arrTime>109.9819741964403</arrTime>
                                  <endTime>119.9819741964403</endTime>
                             </act>
                             <end>229.9639483928806</end>
                        </route>
                        <route>
                             <driverId>noDriver</driverId>
                             <vehicleId>3_1</vehicleId>
                             <start>0.0</start>
                             <act type="service">
                                  <serviceId>2 </serviceId>
                                  <arrTime>109.98268205388193</arrTime>
                                  <endTime>119.98268205388193</endTime>
                             </act>
                             <act type="service">
                                  <serviceId>1 </serviceId>
                                  <arrTime>119.98357684436793</arrTime>
                                  <endTime>129.98357684436792</endTime>
                             </act>
                             <act type="service">
                                  <serviceId>3 </serviceId>
                                  <arrTime>129.98449911991617</arrTime>
                                  <endTime>139.98449911991617</endTime>
                             </act>
                             <act type="service">
                                  <serviceId>4 </serviceId>
                                  <arrTime>139.98539391040217</arrTime>
                                  <endTime>149.98539391040217</endTime>
                             </act>
                             <end>259.9672978232725</end>
                        </route>
                   </routes>
              </solution>
              <solution>
                   <cost>505.9208295302417</cost>
                   <routes>
                        <route>
                             <driverId>noDriver</driverId>
                             <vehicleId>1_1</vehicleId>
                             <start>0.0</start>
                             <act type="service">
                                  <serviceId>5 </serviceId>
                                  <arrTime>109.9819741964403</arrTime>
                                  <endTime>119.9819741964403</endTime>
                             </act>
                             <end>229.9639483928806</end>
                        </route>
                        <route>
                             <driverId>noDriver</driverId>
                             <vehicleId>3_1</vehicleId>
                             <start>0.0</start>
                             <act type="service">
                                  <serviceId>4 </serviceId>
                                  <arrTime>109.98190391287031</arrTime>
                                  <endTime>119.98190391287031</endTime>
                             </act>
                             <act type="service">
                                  <serviceId>2 </serviceId>
                                  <arrTime>119.98282618841856</arrTime>
                                  <endTime>129.98282618841856</endTime>
                             </act>
                             <act type="service">
                                  <serviceId>1 </serviceId>
                                  <arrTime>129.98372097890456</arrTime>
                                  <endTime>139.98372097890456</endTime>
                             </act>
                             <act type="service">
                                  <serviceId>3 </serviceId>
                                  <arrTime>139.9846432544528</arrTime>
                                  <endTime>149.9846432544528</endTime>
                             </act>
                             <end>259.9668316441239</end>
                        </route>
                   </routes>
              </solution>
</problem>

for (int temp = 0; temp < nList.getLength(); temp++) {
    Node nNode = nList.item(temp);
    System.out.println("\nCurrent Element :" + nNode.getNodeName());
    if (nNode.getNodeType() == Node.ELEMENT_NODE) {
        Element eElement = (Element) nNode;
        //System.out.println("route : "
                          // + eElement.getAttribute("id"));
        System.out.println("DriverId : "
                           + eElement.getElementsByTagName("driverId")
                             .item(0).getTextContent());
        System.out.println("vehicleId : "
                           + eElement.getElementsByTagName("vehicleId")
                             .item(0).getTextContent());

                NodeList optionList = eElement.getElementsByTagName("act");
    for (int j = 0; j < optionList.getLength(); ++j)
    {
        Element option = (Element) optionList.item(j);
        for(int k =0;k<1;++k){
        String optionText = option.getTextContent();
       address.add(optionText.replaceAll("[^A-Za-z]"," "));
        System.out.println("Citizen :"+optionText.replaceAll("[^A-Za-z]"," "));}
        ;


    }
             System.out.println("cost : "
                           + eElement.getElementsByTagName("end")
                             .item(0).getTextContent());
    }
}
} catch (Exception e) {
e.printStackTrace();
}

***更新***在这里我设法得到了我想要的，但是有一个问题，对于公民我只有第一个 "act" 标签我需要获得所有标签值

import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 *
 * @author HP
 */
public class JavaApplication39 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        try {
            int totalVehicle;
            totalVehicle = 2;
            File fXmlFile = new File("C:/Users/HP/Desktop/solution.xml");
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
            Document doc = dBuilder.parse(fXmlFile);
            doc.getDocumentElement().normalize();
            Double requiredCost = 505.9208295302417;
            System.out.println("Root element :" + doc.getDocumentElement().getNodeName());
            // NodeList nList = doc.getElementsByTagName("route");
            System.out.println("----------------------------");
            NodeList nodeList = doc.getElementsByTagName("solution");
            for (int i = 0; i < nodeList.getLength(); i++) {

                Node solutionNode = nodeList.item(i);

                if (solutionNode.getNodeType() == Node.ELEMENT_NODE) {
                    Element solutionElement = (Element) solutionNode;
                    Node costNode = solutionElement.getElementsByTagName("cost").item(0);
                    Node route = solutionElement.getElementsByTagName("routes").item(0);
                    // if correct cost, proceed to parse further
                    Double costValue = Double.valueOf(costNode.getTextContent());
                    if (Double.compare(requiredCost, costValue) == 0) {
                        System.out.println("working");
                        // there you go, found the node with the cost 505.9208295302417
                        // now just parse all the node elements you need here

                        System.out.println("cost : "
                                + solutionElement.getElementsByTagName("cost")
                                        .item(0).getTextContent());
                        for (int h = 0; h < totalVehicle; h++) {
                            System.out.println("DriverId : "
                                    + solutionElement.getElementsByTagName("driverId")
                                            .item(h).getTextContent().toString());
                            System.out.println("vehicleId : "
                                    + solutionElement.getElementsByTagName("vehicleId")
                                            .item(h).getTextContent());

                            System.out.println("citizen: "
                                    + solutionElement.getElementsByTagName("act")
                                            .item(h).getTextContent());


                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        //System.out.println(address.get(1)); 
    }

}

Answer 1

是我一个人，还是我没有在您的代码中看到任何比较？检查节点是否具有您需要的成本？您可以循环遍历解决方案节点（正如您正在做的那样），一旦找到正确的成本值，就从该节点解析您需要的所有元素。

示例代码：

NodeList nodeList = doc.getElementsByTagName("solution");
Double requiredCost = 505.9208295302417;
for (int i = 0; i < nodeList.getLength(); i++) {

    Node solutionNode = nodeList.item(i);

    if (solutionNode.getNodeType() == Node.ELEMENT_NODE) {
        Element solutionElement = (Element) solutionNode;
        Node costNode = solutionElement.getElementsByTagName("cost").item(0);

        // if correct cost, proceed to parse further
        Double costValue = Double.valueOf(costNode.getTextContent());
        if (Double.compare(requiredCost, costValue) == 0) {

            // there you go, found the node with the cost 505.9208295302417
            // now just parse all the node elements you need here
        }
    }
}

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