dom4j读取配置数据

数据库、文件目录等都以下面方式配置，用dom4j解析之...

<domain>
        <branch>
              <key>variable</key>
              <value>the value</value> 
        </branch>
</domain>

所依赖的jar包：
dom4j-1.6.1.jar和jaxen-1.1-beta-6.jar
如果不引入jaxen-1.1-beta-6.jar，在使用XPath获取节点获取时会引起下面的异常

Exception in thread "main" java.lang.NoClassDefFoundError: org/jaxen/JaxenException
at org.dom4j.DocumentFactory.createXPath(DocumentFactory.java:230)
at org.dom4j.tree.AbstractNode.createXPath(AbstractNode.java:207)
at org.dom4j.tree.AbstractNode.selectNodes(AbstractNode.java:164)

...

xml配置文件

	<!-- FTP目录配置 caoxh 20101126 -->
	<FtpPathConfig>
	
		<!-- 工单根目录 -->
		<KeyValueMapping>
			<Key>Root_cwmp</Key>
			<Value>/opt/adsl/cwmp</Value>
		</KeyValueMapping>

	</FtpPathConfig>

代码不解释

import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;

public class FtpFileReader {

	private static final String configFileName = "config.xml";

	public static String getVariable8Map(String domain, String branch,
			String variable) {
		
		String retValue = "";
		
		try {
			Map keyValueMap = getKeyValueMap("//"+domain+"/"+branch);
			
			if(keyValueMap!=null){
				retValue = (String) keyValueMap.get(variable);
			}
			
		} catch (DocumentException e) {
			e.printStackTrace();
		}
		
		return retValue;
	}

	public static Map getKeyValueMap(String xPath)  throws DocumentException{

		Map keyValueMap = new HashMap();

		InputStream ins = FtpFileReader.class.getResourceAsStream("/"+ configFileName);
		SAXReader reader = new SAXReader();
		Document doc = reader.read(ins);
		
		List list = doc.selectNodes(xPath);
		
		for (Iterator it = list.iterator(); it.hasNext();) {
			Node keyValueMappingConfig = (Node) it.next();
			Node keyNode = keyValueMappingConfig.selectSingleNode("Key");
			Node valueNode = keyValueMappingConfig.selectSingleNode("Value");
			String key = keyNode.getText();
			String value = valueNode.getText();
			
			keyValueMap.put(key, value);
		}
		
		return keyValueMap;
	}
	

	public static void main(String[] args) {
		
		String valule = getVariable8Map("FtpPathConfig","KeyValueMapping","Root_cwmp");
		
		System.out.println("from config.xml:"+valule);

	}
}