困扰我几周的dom4j无法解析xml命名空间的问题近日得以解决，如果这个问题也正在困扰你，看看下文也许能给你一些启发
xml文件----myXML.xml
代码 <?xml version="1.0" encoding="UTF-8"?> <MyXML xmlns="http://www.ttt.com/ttt-TrdInfo-1-0" xmlns:x="http://www.ttt.com/ttt/metadata.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="res286.xsd"> <Hdr> <ReqId>001</ReqId> <Tid>1002</Tid> <Cid>500</Cid> <user>cuishen</user> <Mname>supermarket</Mname> <pwd>543200210</pwd> </Hdr> <Car> <Flg>T</Flg> <Cod>ccc</Cod> <Door>kkk</Door> <mktId>b01</mktId> <Key> <KeyID>t01</KeyID> </Key> </Car> </MyXML> <script type="text/javascript">render_code();</script>
下面是用dom4j解析上面xml文件的java源文件
---ReadMyXML.java
代码 import java.io.File; import java.util.List; import java.util.Map; import java.util.HashMap; import org.dom4j.Document; import org.dom4j.Element; import org.dom4j.XPath; import org.dom4j.Attribute; import org.dom4j.io.SAXReader; import org.dom4j.DocumentException; public class ReadMyXML{ public static void main(String args[]){ File xmlFile = new File("c:/myXML.xml"); SAXReader xmlReader = new SAXReader(); try{ Document document = xmlReader.read(xmlFile); ///*测试代码 适用于读取xml的节点 HashMap xmlMap = new HashMap(); xmlMap.put("mo","http://www.ttt.com/ttt-TrdInfo-1-0"); XPath x = document.createXPath("//mo:ReqId"); x.setNamespaceURIs(xmlMap); Element valueElement = (Element)x.selectSingleNode(document); System.out.println(valueElement.getText()); //*/ }catch(DocumentException e){ e.printStackTrace(); } } } <script type="text/javascript">render_code();</script>
上面就是运用dom4j解析带命名空间的xml文件的节点的例子，只要给XPath设置默认的命名空间就行了，这个xml文件尽管定义了其他命名空间，但是没有用到它，所以不必管它，那个HashMap里的键是随便定义的字符串，值就是默认的命名空间对应的字符串。document.createXPath()里传的参数是要读取的节点的XPath，即“//”+ HashMap里的键名 + “:”+ 要读取的节点名组成的字符串，简单吧，后面怎么做我就不用说了吧^_^ 如果要读取的是xml文件里的属性该怎么办呢，不用急，看看下面的例子你就明白了，原理一样，只要在造XPath字符串的时候在属性前加个“@”就行了。
xml文件----myXML2.xml
代码 <?xml version="1.0" encoding="UTF-8"?> <MyXML xmlns="http://www.ttt.com/ttt-TrdInfo-1-0" xmlns:x="http://www.ttt.com/ttt/metadata.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="res286.xsd"> <Hdr ReqId="001" Tid="1002" Cid="500" user="cuishen" Mname="supermarket" pwd="543200210"/> <Car Flg="T" Cod="ccc" Door="kkk" mktId="b01"> <Key KeyID="t01"/> </Car> </MyXML> <script type="text/javascript">render_code();</script>
解析上面xml文件的java文件如下 ---ReadMyXML2.java
代码 import java.io.File; import java.util.List; import java.util.Map; import java.util.HashMap; import org.dom4j.Document; import org.dom4j.Element; import org.dom4j.XPath; import org.dom4j.Attribute; import org.dom4j.io.SAXReader; import org.dom4j.DocumentException; public class ReadMyXML2{ public static void main(String args[]){ File xmlFile = new File("c:/myXML2.xml"); SAXReader xmlReader = new SAXReader(); try{ Document document = xmlReader.read(xmlFile); ///*测试代码 解析xml的属性 HashMap xmlMap = new HashMap(); xmlMap.put("mo","http://www.ttt.com/ttt-TrdInfo-1-0"); XPath x = document.createXPath("//mo:Hdr/@ReqId"); x.setNamespaceURIs(xmlMap); Attribute valueAttribute = (Attribute)x.selectSingleNode(document); System.out.println(valueAttribute.getText()); //*/ }catch(DocumentException e){ e.printStackTrace(); } } } <script type="text/javascript">render_code();</script>
