xpath用法

有如下的xml文件nodes.xml :
<library>
  <book sum="22">helloworld
  </book>
</library>

提取 "helloworld" 这个字符串 :
        String filePath = "nodes.xml";
        InputSource inputSource = new InputSource(filePath);
        XPath xpath = XPathFactory.newInstance().newXPath();
        String expression = "/library/book[@sum='22']";
        String nodes = xpath.evaluate (expression, inputSource);

参考 : xpath语法, xpath validation , easy and efficient xml

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