【精简】解析xml文件解决多个同名标签问题 hutool

一、测试XML报文用例

<?xml version="1.0" encoding="UTF-8"?>
<TEST>
    <PUB>
        <TransSource>ERP</TransSource>
        <TransCode>DsbrRpl</TransCode>
        <TransSeq>202204081043</TransSeq>
        <Version>1.0</Version>
    </PUB>
    <IN>
        <RD>
            <ReqSeqID>TEST1202201250001</ReqSeqID>
            <RdSeq>TEST00001</RdSeq>
            <Reserved1>保留字段1</Reserved1>
            <Reserved2>保留字段2</Reserved2>
            <Reserved3>保留字段3</Reserved3>
        </RD>
        <RD>
            <ReqSeqID>TEST1202201250002</ReqSeqID>
            <RdSeq>TEST00002</RdSeq>
            <Reserved1>保留字段1</Reserved1>
            <Reserved2>保留字段2</Reserved2>
            <Reserved3>保留字段3</Reserved3>
        </RD>
    </IN>
</TEST>

二、使用代码获取 TEST1202201250002这个值

        Document document = null;
        try {
            document = XmlUtil.readXML(message);	//message为xml报文
        }catch (Exception e){
            throw new LunaBusinessException("请检查报文格式是否合规");
        }
        String xpath = "//TEST/IN/RD[2]/ReqSeqID";	//RD[2]  代表去匹配第二组RD的同名标签  其他层级的同名标签匹配同理，此处涉及的知识点，请搜索 xpath表达式
        String elemValue = XmlUtil.getByXPath(xpath, document, XPathConstants.STRING).toString();