java中获取xml文件的某个配置节点内容方式

<?xml version="1.0" encoding="UTF-8"?>
<webapp-configs>
    <param name="IP" value="127.0.0.1"/>
    <param name="PORT" value="8070"/>
</webapp-configs>

public class WebappConfigUtil {
    private final static String CONFIG_FILE_NAME = "/webapp-config.xml";
    private Document configDocument;
    private static WebappConfigUtil instance = new WebappConfigUtil();//得到配置文件的document对象
    private WebappConfigUtil() {
        SAXReader reader = new SAXReader();//创建一个读取xml文件的对象
        try {
            configDocument = reader.read(WebappConfigUtil.class
                    .getResourceAsStream(CONFIG_FILE_NAME));//括号内：查找具有给定名称的资源 括号外：得到document对象
        } catch (DocumentException exp) {
            configDocument = DocumentHelper.createDocument();
            configDocument.addElement("webapp-configs");
        }
    }
    public static String getParameter(String name) {
        //读取wabapp-config.xml的字符串（大标签套小标签）
        String xpath = "/webapp-configs/param[@name='" + name + "']/@value";
        Node node = instance.configDocument.selectSingleNode(xpath);//找到节点
        if (node == null) {
            return "";
        }
        return node.getText();
    }
    public static void main(String[] args){
        System.out.println(WebappConfigUtil.getParameter("PORT"));
    }
}

    public static List<String> getParameterList(String name) {
        String xpath = "/webapp-configs/param[@name='" + name + "']/list/value";
        List<?> nodes = instance.configDocument.selectNodes(xpath);
        List<String> values = new ArrayList<String>();
        for (Iterator<?> iter = nodes.iterator(); iter.hasNext();) {
            Node node = (Node) iter.next();
            values.add(node.getText());
        }
        return values;
    }

        <dependency>
			<groupId>dom4j</groupId>
			<artifactId>dom4j</artifactId>
			<version>1.6.1</version>
		</dependency>

import java.util.*;
import java.util.stream.Collectors;
import org.dom4j.*;
public class XmlUtil {
    /**
     * 获取XML指定节点内容
     * @param xml xml内容
     * @param attrName 节点名称（例如：TranData.OutputData.Result）
     * @return
     * @throws Exception
     */
    public static String getXmlAttrValue(String xml,String attrName) throws Exception {
        if (null==xml||xml.equals("")||null==attrName||attrName.equals("")){
            return null;
        }
        String[] attrs = attrName.split("\\.");
        int length = attrs.length;
        String result = null;
        // 将xml格式字符串转化为DOM对象
        Document document = DocumentHelper.parseText(xml);
        // 获取根结点对象
        Element element = document.getRootElement();
        List<Element> elements = Arrays.asList(element);
        for (int i = 0; i < length; i++) {
            Map<String,Element> elementMap = elements.stream().collect(Collectors.toMap(e->e.getName(),e->e));
            if (elementMap.containsKey(attrs[i])){
                if (i==length-1){
                    result = elementMap.get(attrs[i]).asXML();
                    break;
                }else {
                    elements = elementMap.get(attrs[i]).elements();
                }
            }else {
                throw new Exception("Node does not exist:"+attrName);
            }
        }
        return result;
    }
}

    public static void main(String[] args) throws Exception {
        String xml = "<?xml version=\"1.0\" encoding=\"GBK\"?>\n" +
                "<TranData>\n" +
                "    <ClientInfo>\n" +
                "        <resultCode>0</resultCode>\n" +
                "        <resultMsg>查询成功</resultMsg>\n" +
                "        <transDate>2023-08-30</transDate>\n" +
                "    </ClientInfo>\n" +
                "    <InputData>\n" +
                "        <PolicyNum>321052800581541</PolicyNum>\n" +
                "    </InputData>\n" +
                "    <OutputData>\n" +
                "        <Result>\n" +
                "            <SubPolBackFee>111.52</SubPolBackFee>\n" +
                "            <InceptContValue>0</InceptContValue>\n" +
                "            <OtherDeduct>1430.48</OtherDeduct>\n" +
                "            <AccountChg>0</AccountChg>\n" +
                "            <CashValue>1542.00</CashValue>\n" +
                "            <BankCode>103</BankCode>\n" +
                "            <BankCodeName>中国农业银行</BankCodeName>\n" +
                "            <BankAccNo>6228480320236711910</BankAccNo>\n" +
                "            <AccName>快快快</AccName>\n" +
                "            <SumPrem>1542</SumPrem>\n" +
                "            <SumAmnt>100000</SumAmnt>\n" +
                "            <PayCount>1</PayCount>\n" +
                "            <LiveInsuaccMoney>0.0</LiveInsuaccMoney>\n" +
                "            <BonusInsuaccMoney>0.0</BonusInsuaccMoney>\n" +
                "            <LoanAmnt></LoanAmnt>\n" +
                "            <LoanInterest></LoanInterest>\n" +
                "        </Result>\n" +
                "    </OutputData>\n" +
                "</TranData>\n";
        String result = getXmlAttrValue(xml,"TranData.OutputData.Result.BankCodeName");
        System.out.println(result);
    }