循环NodeList Java

Question

我有以下代码：

https://code.sololearn.com/c9RLoBhB7Mua

public class Program {

    public static String frontLeft1 = "";
    public static String frontLeft2 = "";

    public static String frontRight1 = "";
    public static String frontRight2 = "";

    public static String rearLeft1 = "";
    public static String rearLeft2 = "";

    public static String rearRight1 = "";
    public static String rearRight2 = "";

    public static void main(String[] args) {

        try {
        String xml = "<DiagnosticResult><REGISTRATION>123123</REGISTRATION><RESULT OBJECT=\"WHEEL_ALIGNMENT\" METHOD=\"MANUFACTURER_SPECIFIC\"><SECTION OBJECT=\"TIRE_INSPECTION\" AXLE=\"1\"><TITLE>Tire Inspection Axle 1</TITLE><MEAS OBJECT=\"TREAD_DEPTH_DISPLAY_1\" LOC=\"LEFT\"><TITLE>Tread Depth Point</TITLE><VALUE UNIT=\"mm\" RESULT=\"0\">4.491</VALUE><VALUE TYPE=\"DISP\" UNIT=\"finch\" LOWLIM1=\"2/32\" LOWLIM2=\"4/32\" RESULT=\"1\">1/32</VALUE></MEAS><MEAS OBJECT=\"TREAD_DEPTH_DISPLAY_2\" LOC=\"LEFT\"><TITLE>Tread Depth Point</TITLE><VALUE UNIT=\"mm\" RESULT=\"0\">4.491</VALUE><VALUE TYPE=\"DISP\" UNIT=\"finch\" LOWLIM1=\"2/32\" LOWLIM2=\"4/32\" RESULT=\"1\">2/32</VALUE></MEAS><MEAS OBJECT=\"TREAD_DEPTH_DISPLAY_1\" LOC=\"RIGHT\"><TITLE>Tread Depth Point</TITLE><VALUE UNIT=\"mm\" RESULT=\"0\">4.491</VALUE><VALUE TYPE=\"DISP\" UNIT=\"finch\" LOWLIM1=\"2/32\" LOWLIM2=\"4/32\" RESULT=\"1\">3/32</VALUE></MEAS><MEAS OBJECT=\"TREAD_DEPTH_DISPLAY_2\" LOC=\"RIGHT\"><TITLE>Tread Depth Point</TITLE><VALUE UNIT=\"mm\" RESULT=\"0\">4.491</VALUE><VALUE TYPE=\"DISP\" UNIT=\"finch\" LOWLIM1=\"2/32\" LOWLIM2=\"4/32\" RESULT=\"1\">4/32</VALUE></MEAS></SECTION><SECTION OBJECT=\"TIRE_INSPECTION\" AXLE=\"2\"><MEAS OBJECT=\"TREAD_DEPTH_DISPLAY_1\" LOC=\"LEFT\"><TITLE>Tread Depth Point</TITLE><VALUE UNIT=\"mm\" RESULT=\"0\">5.199</VALUE><VALUE TYPE=\"DISP\" UNIT=\"finch\" LOWLIM1=\"2/32\" LOWLIM2=\"4/32\" RESULT=\"1\">5/32</VALUE></MEAS><MEAS OBJECT=\"TREAD_DEPTH_DISPLAY_2\" LOC=\"LEFT\"><TITLE>Tread Depth Point</TITLE><VALUE UNIT=\"mm\" RESULT=\"0\">4.491</VALUE><VALUE TYPE=\"DISP\" UNIT=\"finch\" LOWLIM1=\"2/32\" LOWLIM2=\"2/32\" RESULT=\"1\">6/32</VALUE></MEAS><MEAS OBJECT=\"TREAD_DEPTH_DISPLAY_1\" LOC=\"RIGHT\"><TITLE>Tread Depth Point</TITLE><VALUE UNIT=\"mm\" RESULT=\"0\">4.491</VALUE><VALUE TYPE=\"DISP\" UNIT=\"finch\" LOWLIM1=\"2/32\" LOWLIM2=\"4/32\" RESULT=\"1\">7/32</VALUE></MEAS><MEAS OBJECT=\"TREAD_DEPTH_DISPLAY_2\" LOC=\"RIGHT\"><TITLE>Tread Depth Point</TITLE><VALUE UNIT=\"mm\" RESULT=\"0\">4.491</VALUE><VALUE TYPE=\"DISP\" UNIT=\"finch\" LOWLIM1=\"2/32\" LOWLIM2=\"1/32\" RESULT=\"1\">8/32</VALUE></MEAS></SECTION></RESULT></DiagnosticResult>";
        DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        dbFactory.setNamespaceAware(true);
        DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
        Document document = dBuilder.newDocument();
        document = dBuilder.parse(new ByteArrayInputStream(xml.getBytes()));

        NodeList nodeListMeas = document.getElementsByTagName("MEAS");
        NodeList nodeListSection = document.getElementsByTagName("SECTION");

        for (int i = 0; i < nodeListSection.getLength(); i++) {
            Element sectionElement = (Element) nodeListSection.item(i);
            if (sectionElement.getAttribute("AXLE").equals("1")) {
                for (int j = 0; j < nodeListMeas.getLength(); j++) {
                    Element measElement = (Element) nodeListMeas.item(j);
                    Node node = nodeListMeas.item(j);
                    if (measElement.getAttribute("OBJECT").equals("TREAD_DEPTH_DISPLAY_1")) {
                        NodeList childNodeList = measElement.getElementsByTagName("VALUE");
                        Element childElement = (Element) childNodeList.item(1);
                        if (measElement.getAttribute("LOC").equals("LEFT")) {
                            frontLeft1 = childElement.getTextContent();
                        } else if (measElement.getAttribute("LOC").equals("RIGHT")) {
                            frontRight1 = childElement.getTextContent();
                        }
                    }
                    if (measElement.getAttribute("OBJECT").equals("TREAD_DEPTH_DISPLAY_2")) {
                        NodeList childNodeList = measElement.getElementsByTagName("VALUE");
                        Element childElement = (Element) childNodeList.item(1);
                        if (measElement.getAttribute("LOC").equals("LEFT")) {
                            frontLeft2 = childElement.getTextContent();
                        } else if (measElement.getAttribute("LOC").equals("RIGHT")) {
                            frontRight2 = childElement.getTextContent();
                        }
                    }

                 }
            } else if (sectionElement.getAttribute("AXLE").equals("2")) {
                for (int j = 0; j < nodeListMeas.getLength(); j++) {
                    Element measElement = (Element) nodeListMeas.item(j);
                    Node node = nodeListMeas.item(j);
                    if (measElement.getAttribute("OBJECT").equals("TREAD_DEPTH_DISPLAY_1")) {
                        NodeList childNodeList = measElement.getElementsByTagName("VALUE");
                        Element childElement = (Element) childNodeList.item(1);
                        if (measElement.getAttribute("LOC").equals("LEFT")) {
                            rearLeft1 = childElement.getTextContent();
                        } else if (measElement.getAttribute("LOC").equals("RIGHT")) {
                            rearRight1 = childElement.getTextContent();
                        }
                    }
                    if (measElement.getAttribute("OBJECT").equals("TREAD_DEPTH_DISPLAY_2")) {
                        NodeList childNodeList = measElement.getElementsByTagName("VALUE");
                        Element childElement = (Element) childNodeList.item(1);
                        if (measElement.getAttribute("LOC").equals("LEFT")) {
                            rearLeft2 = childElement.getTextContent();
                        } else if (measElement.getAttribute("LOC").equals("RIGHT")) {
                            rearRight2 = childElement.getTextContent();
                        }
                    }

                }
            }
        }

        System.out.println(frontLeft1);
        System.out.println(frontLeft2);
        System.out.println(frontRight1);
        System.out.println(frontRight2);
        System.out.println(rearLeft1);
        System.out.println(rearLeft2);
        System.out.println(rearRight1);
        System.out.println(rearRight2);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

我遇到的问题是变量被覆盖了。

Output 应该是：

1/32
2/32
3/32
4/32
5/32
6/32
7/32
8/32

但现在是：

5/32
6/32
7/32
8/32
5/32
6/32
7/32
8/32

我显然在循环中遗漏了一些东西，但我无法弄清楚究竟是什么。 我在AXLE 1上进行迭代，然后我认为我在AXLE 2上做同样的事情，但看起来AXLE 2写在AXLE 1上。

XML：

<DiagnosticResult>
   <SECTION OBJECT="TIRE_INSPECTION" AXLE="1">
      <TITLE>Tire Inspection Axle 1</TITLE>
      <MEAS OBJECT="TREAD_DEPTH_DISPLAY_1" LOC="LEFT">
         <TITLE>Tread Depth Point</TITLE>
         <VALUE UNIT="mm" RESULT="0">4.491</VALUE>
         <VALUE TYPE="DISP" UNIT="finch" LOWLIM1="2/32" LOWLIM2="4/32" RESULT="1">1/32</VALUE>
      </MEAS>
      <MEAS OBJECT="TREAD_DEPTH_DISPLAY_2" LOC="LEFT">
         <TITLE>Tread Depth Point</TITLE>
         <VALUE UNIT="mm" RESULT="0">5.871</VALUE>
         <VALUE TYPE="DISP" UNIT="finch" LOWLIM1="2/32" LOWLIM2="4/32" RESULT="1">2/32</VALUE>
      </MEAS>
      <MEAS OBJECT="TREAD_DEPTH_DISPLAY_1" LOC="RIGHT">
         <TITLE>Tread Depth Point</TITLE>
         <VALUE UNIT="mm" RESULT="0">5.694</VALUE>
         <VALUE TYPE="DISP" UNIT="finch" LOWLIM1="2/32" LOWLIM2="4/32" RESULT="1">3/32</VALUE>
      </MEAS>
      <MEAS OBJECT="TREAD_DEPTH_DISPLAY_2" LOC="RIGHT">
         <TITLE>Tread Depth Point</TITLE>
         <VALUE UNIT="mm" RESULT="0">4.821</VALUE>
         <VALUE TYPE="DISP" UNIT="finch" LOWLIM1="2/32" LOWLIM2="4/32" RESULT="1">4/32</VALUE>
      </MEAS>
   </SECTION>
   <SECTION OBJECT="TIRE_INSPECTION" AXLE="2">
      <MEAS OBJECT="TREAD_DEPTH_DISPLAY_1" LOC="LEFT">
         <TITLE>Tread Depth Point</TITLE>
         <VALUE UNIT="mm" RESULT="0">5.199</VALUE>
         <VALUE TYPE="DISP" UNIT="finch" LOWLIM1="2/32" LOWLIM2="4/32" RESULT="1">5/32</VALUE>
      </MEAS>
      <MEAS OBJECT="TREAD_DEPTH_DISPLAY_2" LOC="LEFT">
         <TITLE>Tread Depth Point</TITLE>
         <VALUE UNIT="mm" RESULT="0">6.052</VALUE>
         <VALUE TYPE="DISP" UNIT="finch" LOWLIM1="2/32" LOWLIM2="4/32" RESULT="1">6/32</VALUE>
      </MEAS>
      <MEAS OBJECT="TREAD_DEPTH_DISPLAY_1" LOC="RIGHT">
         <TITLE>Tread Depth Point</TITLE>
         <VALUE UNIT="mm" RESULT="0">5.270</VALUE>
         <VALUE TYPE="DISP" UNIT="finch" LOWLIM1="2/32" LOWLIM2="4/32" RESULT="1">7/32</VALUE>
      </MEAS>
      <MEAS OBJECT="TREAD_DEPTH_DISPLAY_2" LOC="RIGHT">
         <TITLE>Tread Depth Point</TITLE>
         <VALUE UNIT="mm" RESULT="0">5.249</VALUE>
         <VALUE TYPE="DISP" UNIT="finch" LOWLIM1="2/32" LOWLIM2="4/32" RESULT="1">8/32</VALUE>
      </MEAS>
   </SECTION>
</DiagnosticResult>

Answer 1

您检索整个文档的“MEAS”标签。

    NodeList nodeListMeas = document.getElementsByTagName("MEAS");

您可以移动此行并对其进行编辑以将搜索限制为一次只搜索一个部分：

    for (int i = 0; i < nodeListSection.getLength(); i++) {
        Element sectionElement = (Element) nodeListSection.item(i);
        NodeList nodeListMeas = sectionElement.getElementsByTagName("MEAS");

Answer 2

最终，问题是需要在每个循环中执行以下操作，而不是在第 33 行之前的行（NodeList nodeListSection = document.getElementsByTagName("SECTION");）

    NodeList nodeListMeas = sectionElement.getElementsByTagName("MEAS");

另外，请注意，我仍然得到有问题的 NodeList，而是从相应的“sectionElement”得到它。