Question

我需要读取xml文档内容并使用xpath

读取键值对

document.xml中

<?xml version="1.0" encoding="UTF-8"?>
<Disposition-Config>
    <LOB>
        <lob_pair key = "0" value = "N/A"/>
    </LOB>
    <SourceCode>
        <sourcecode_pair key = "0" value = "N/A"/>
    </SourceCode>
    <TerminationCode>
        <terminationcode_pair key = "0" value = "N/A"/>
    </TerminationCode>
</Disposition-Config>

jsp scriplet

<%
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();

try {
    out.println(request.getRealPath("/WEB-INF/disposition.xml"));
    Document doc = db.parse(new File(request.getRealPath("/WEB-INF/document.xml")));
    out.println(doc);
    String  lobExpression = "/Disposition-Config/LOB/lob_pair";
    String  sourceCodeExpression = "/Disposition-Config/SourceCode/sourcecode_pair";
    String  terminationCodeExpression = "/Disposition-Config/TerminationCode/terminationcode_pair";
    CMETabReader cmeTabReader = new CMETabReader();
    /* class to retrieve key value from xml */
    cmeTabReader.getDispositionValues(doc, lobExpression);
} catch(Exception e) {
    out.print(e);
    e.printStackTrace();
}

%>

但是当我尝试使用

打印xml文档时

<% out.println(doc) %>

它的印刷品如

 [#document: null]

任何建议???

Answer 1

public static void main(String[] arg){
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    factory.setNamespaceAware(true);
    DocumentBuilder builder;
    try {
        builder = factory.newDocumentBuilder();
        Document doc = builder.parse("book.xml");
        XPathFactory xfactory = XPathFactory.newInstance();
        XPath xpath = xfactory.newXPath();
        XPathExpression expr = xpath.compile("//lob_pair//@value");
        String result = (String)expr.evaluate(doc, XPathConstants.STRING);          
        System.out.println(result);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

您可以使用此在线解析器http://chris.photobooks.com/xml/default.htm

测试您的xpath表达式

Answer 2

只需改变你的文档，如

文档doc = db.parse（“http://l.h.:8087/rootfilename/xmlfilename.xml”）;

l表示local和h = host;

使用jsp读取xml文档

2 个答案: