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java中獲取xml文件的某個(gè)配置節(jié)點(diǎn)內(nèi)容方式

更新時(shí)間：2023年06月17日 10:19:04 作者：我不想成禿頭

這篇文章主要介紹了java中獲取xml文件的某個(gè)配置節(jié)點(diǎn)內(nèi)容方式，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

java獲取xml文件的某個(gè)配置節(jié)點(diǎn)內(nèi)容

如果想要直接獲取webconfig.xml里面某個(gè)配置文件的節(jié)點(diǎn)的內(nèi)容，如何優(yōu)雅的實(shí)現(xiàn)？

例如有個(gè)xml文件如下：

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

如何獲取PORT的value是多少呢？

下面是代碼：

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對(duì)象
?? ?private WebappConfigUtil() {
?? ??? ?SAXReader reader = new SAXReader();//創(chuàng)建一個(gè)讀取xml文件的對(duì)象
?? ??? ?try {
?? ??? ??? ?configDocument = reader.read(WebappConfigUtil.class
?? ??? ??? ??? ??? ?.getResourceAsStream(CONFIG_FILE_NAME));//括號(hào)內(nèi)：查找具有給定名稱的資源 括號(hào)外：得到document對(duì)象
?? ??? ?} catch (DocumentException exp) {
?? ??? ??? ?configDocument = DocumentHelper.createDocument();
?? ??? ??? ?configDocument.addElement("webapp-configs");
?? ??? ?}
?? ?}
?? ?public static String getParameter(String name) {
?? ??? ?//讀取wabapp-config.xml的字符串（大標(biāo)簽套小標(biāo)簽）
?? ??? ?String xpath = "/webapp-configs/param[@name='" + name + "']/@value";
?? ??? ?Node node = instance.configDocument.selectSingleNode(xpath);//找到節(jié)點(diǎn)
?? ??? ?if (node == null) {
?? ??? ??? ?return "";
?? ??? ?}
?? ??? ?return node.getText();
?? ?}
?? ?public static void main(String[] args){
?? ??? ?System.out.println(WebappConfigUtil.getParameter("PORT"));
?? ?}
}

如果想獲取參數(shù)為name的所有節(jié)點(diǎn)的list，那么

?? ?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;
?? ?}

java根據(jù)xml節(jié)點(diǎn)地址獲取指定節(jié)點(diǎn)內(nèi)容

備好幾個(gè)前同事問過怎么獲取xml指定節(jié)點(diǎn)內(nèi)容后，終于決定寫個(gè)工具類

maven依賴包

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

XmlUtil

import java.util.*;
import java.util.stream.Collectors;
import org.dom4j.*;
public class XmlUtil {
    /**
     * 獲取XML指定節(jié)點(diǎn)內(nèi)容
     * @param xml xml內(nèi)容
     * @param attrName 節(jié)點(diǎn)名稱（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;
        // 將xml格式字符串轉(zhuǎn)化為DOM對(duì)象
        Document document = DocumentHelper.parseText(xml);
        // 獲取根結(jié)點(diǎn)對(duì)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;
    }
}

測(cè)試代碼

    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>查詢成功</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>中國(guó)農(nóng)業(yè)銀行</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);
    }

測(cè)試結(jié)果輸出