Question

我有以下xml：

<?xml version="1.0" encoding="UTF-8"?>
<GSP VER="3.2">
   <TM>0</TM>
   <Q>monkey pay</Q>
   <Context>
      <total_results>3</total_results>
   </Context>
   <RES EN="3" SN="1">
      <M>3</M>
      <R N="1">
         <U>link1</U>
         <T>title1</T>
         <S>snippet1</S>
      </R>
      <R N="2">
         <U>link2</U>
         <T>title2</T>
         <S>snippet2</S>
         <PageMap>
            <DataObject type="metatags">
               <Attribute name="viewport" value="width=992, maximum-scale=2.0" />
               <Attribute name="dc.subject" value="atributevalue" />
               <Attribute name="og:title" value="atributevalue" />
               <Attribute name="og:description" value="atributevalue" />
               <Attribute name="og:image" value="atributevalue" />
            </DataObject>
            <DataObject type="cse_image">
               <Attribute name="src" value="atributevalue" />
            </DataObject>
            <DataObject type="cse_thumbnail">
               <Attribute name="width" value="atributevalue" />
               <Attribute name="height" value="atributevalue" />
               <Attribute name="src" value="image2" />
            </DataObject>
         </PageMap>
      </R>
      <R N="3">
         <U>link3</U>
         <T>title3</T>
         <S>snippet3</S>
      </R>
   </RES>
</GSP>

我需要获取属性名称的值=＆＃34; src＆＃34;标签＆＃34;属性＆＃34;在＆＃34; DataObject＆＃34;内部标签，其属性类型为＆＃34; cse_thumbnail＆＃34;。

这个的xpath是： / GSP / RES / R [@ N = 2] /页映射/数据对象[@type =＆＃39; cse_thumbnail＆＃39;] /属性[@name =＆＃39; SRC＆＃39;] / @值

您知道如何在Java中使用DOMXpath提取它吗？

现在我可以使用链接，标题和片段获取所有R标记，但我无法提取PageMap值。

这就是我解析R标签的方法：

    List resultNodes = new DOMXPath("/GSP/RES/R").selectNodes(domDoc);
    Iterator nodeIter = resultNodes.iterator();
    while (nodeIter.hasNext()) {
        Object obj = nodeIter.next();
        Element elem = (Element) object;
    }

Answer 1

我不知道它为什么不起作用。标准的java实现怎么样：

XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
XPathExpression expr = xpath.compile("your path");

java DOMXpath获取属性值

1 个答案: