dom4j中使用xpath解析带命名空间的xml文件,取不到节点的解决办法
使用 DOM4J 的xpath 非常方便，但是,直接使用xpath 取带命名空间的xm文件，会出现取不到节点的问题.具体问题如下
<message id="oNVls-26" to="[email protected]" from="[email protected]/Smack" type="chat"> <subject>zscasvgsadg</subject> <body>sdvgsdvsaddzsfbnzsdfbvdas</body> <thread>0pMmg6</thread> <ext xmlns="infoair:obcs:msg:ext"> <identify>1306663476453admin38</identify> <sendType>NOR</sendType> <awokeTime>60</awokeTime> <x xmlns="infoair:obcs:msg:source" var="130666347645334345"/></ext> </message>
如果想取
identify的值：使用xpathexpression:“/message/ext/identify”将不能取到值
取x的属性值：使用xpathexpression:“/message/ext/identify/x/@var“;也不能取到xvar的属性值
那么该怎么做了，直接上代码：public static MessageNode getNode1(String msg)
throws DocumentException
{
SAXReader reader = new SAXReader();
Document document = reader.read(new StringReader(msg));
XPath xPath = document.createXPath("/message/a:ext/a:identify");
Map<String, String> names = new HashMap<String, String>();
names.put("a", "infoair:obcs:msg:ext");
MessageNode messageNode = new MessageNode();
xPath.setNamespaceURIs(names);
Node node = xPath.selectSingleNode(document);
messageNode.setIdentify(node.getText());
xPath = document.createXPath("/message/a:ext/b:x/@var");
names.put("b", "infoair:obcs:msg:source");
xPath.setNamespaceURIs(names);
node = xPath.selectSingleNode(document);
messageNode.setParentId(node.getText());
return messageNode;
}names.put("a", "infoair:obcs:msg:ext");只要 xpath 选择时，加上命名空间就行了
"a"表示前缀，"infoair:obcs:msg:ext"表示命名空间。
具体原因，请见：
XML 命名空间以及它们如何影响 XPath 和 XSLT (Extreme XML)相关推荐
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