Question

在运行命名空间时，我有一个小的测试文件。如果我删除命名空间这两项工作我是否在使用巨大的代码做错了什么？

已更改为删除无法使用的代码

    try {
        //without namespace works
        VTDGen vtdGen = new VTDGen();
        vtdGen.parseFile("test.xml", false);
        VTDNav vtdNav = vtdGen.getNav();
        AutoPilot autoPilot = new AutoPilot(vtdNav);
        autoPilot.selectXPath("//Receiver/Identifier");
        autoPilot.evalXPath();
        System.out.println("Stand===>" + vtdNav.getXPathStringVal() + " ===>");
    } catch(IndexOutOfBoundsException e) {
        e.printStackTrace();
    }

    try {
        //with namespace doesn't work
        VTDGen vtdGen = new VTDGen();
        vtdGen.parseFile("test.xml", true);
        VTDNav vtdNav = vtdGen.getNav();
        AutoPilot autoPilot = new AutoPilot(vtdNav);
        autoPilot.declareXPathNameSpace("x", "http://test/namespaces/ssfgf");
        autoPilot.selectXPath("//x:Receiver/Identifier");
        int index = autoPilot.evalXPath();
        System.out.println("Stand NS ===>" + vtdNav.toString(index) + " ===>");
    } catch(IndexOutOfBoundsException e) {
        e.printStackTrace();
    }

    try {
        //without namespace doesn't work
        VTDGenHuge vg = new VTDGenHuge();
        vg.parseFile("test.xml", false);
        VTDNavHuge vn = vg.getNav();
        AutoPilotHuge ap = new AutoPilotHuge(vn);
        ap.selectXPath("//Receiver/Identifier");
        ap.evalXPath();
        System.out.println("Huge ===> " + vn.toString(vn.getText()) + " ===>");
    } catch(IndexOutOfBoundsException e) {
        e.printStackTrace();
    }

    try {
        //with namespace doesn't work
        VTDGenHuge vg = new VTDGenHuge();
        vg.parseFile("test.xml", true);
        VTDNavHuge vn = vg.getNav();
        AutoPilotHuge ap = new AutoPilotHuge(vn);
        ap.declareXPathNameSpace("x", "http://test/namespaces/ssfgf");
        ap.selectXPath("//Receiver/Identifier");
        ap.evalXPath();
        System.out.println("Huge NS ===> " + vn.toString(vn.getText()) + " ===>");
    } catch(IndexOutOfBoundsException e) {
        e.printStackTrace();
    }

对于巨大的代码和带有NS的标准，我得到java.lang.IndexOutOfBoundsException

这是一个样本XML，遗憾的是无法显示真正的xml

<x:TestDocument xmlns:x="http://test/namespaces/ssfgf" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://test/namespaces/ssfgf">
    <x:TestHeader>
        <x:Type></x:Type>
        <x:Scopes>
            <x:Scope>
                <x:Identifier>Context</x:Identifier>
                <x:Type>CaseId</x:Type>
                <x:InstanceIdentifier>case1</x:InstanceIdentifier>
                <x:Business>
                    <x:Name>businessnane1</x:Name>
                </x:Business>
            </x:Scope>
            <x:Scope>
                <x:Identifier>Context</x:Identifier>
                <x:InstanceIdentifier>test1</x:InstanceIdentifier>
                <x:Type>TestId</x:Type>
            </x:Scope>
            <x:Scope>
                <x:Identifier>Context</x:Identifier>
                <x:InstanceIdentifier>other1</x:InstanceIdentifier>
                <x:Type>OtherId</x:Type>
            </x:Scope>
        </x:Scopes>
        <x:Receiver>
            <x:Identifier>testreceiverid</x:Identifier>
        </x:Receiver>
        <x:DocumentIdentification>
            <x:Type>type1</x:Type>
            <x:Identifier>id1</x:Identifier>
            <x:TypeVersion>version1</x:TypeVersion>
        </x:DocumentIdentification>
    </x:TestHeader>
    <x:TestBody attribute1="attribute1" attribute2="attribute2">
        <TestingData>testingdata1</TestingData>
    </x:TestBody>
</x:TestDocument>

Answer 1

由于一些问题，你得到了例外：一些是您的代码，另一些是扩展的VTD-xml。

首先，你没有使用VTD的第二个代码段开启名称空间感知。

你也没有设置名称空间绑定权..

  ap.declareXPathNameSpace("x", "http://test/namespaces/ssfgf");

第三，getText（）返回-1，导致异常。

最后，// test将不匹配任何节点...所以getText（）肯定会返回-1。

VTD-XML大数据xPathExpression不使用名称空间

1 个答案: