java dom4j解析xml实例

java利用dom4j解析xml 需要的jar包： 
dom4j官方网站在 http://www.dom4j.org/ 
下载dom4j-1.6.1.zip 
解开后有两个包,仅操作XML文档的话把dom4j-1.6.1.jar加入工程就可以了,如果需要使用XPath的话还需要加入包jaxen-1.1-beta-7.jar(如果不导入这个架包程序可以执行出结果，但最后会报异常) 
将相关jar包引入后，实际解析操作如下： 

1.要解析的xml文件data.xml：

<?xml version="1.0" encoding="UTF-8"?> 
<ReturnInfo> 
<userlist> 
<item index="1" level="60" nickname="凄惨的老生" country="金" 
weiwang="136929" /> 
<item index="2" level="85" nickname="哭泣的至尊宝" country="金" 
weiwang="97490" /> 
<item index="3" level="85" nickname="老公" country="金" 
weiwang="91103" /> 
<item index="4" level="78" nickname="冉闵" country="金" 
weiwang="82828" /> 
<item index="5" level="55" nickname="erggh" country="金" 
weiwang="77440" /> 
<item index="6" level="60" nickname="孤峰" country="金" 
weiwang="67821" /> 
<item index="7" level="60" nickname="乱世" country="金" 
weiwang="67675" /> 
<item index="8" level="62" nickname="叛逆之神" country="金" 
weiwang="61839" /> 
<item index="9" level="60" nickname="双乔主人" country="金" 
weiwang="61647" /> 
<item index="10" level="60" nickname="视觉效果" country="金" 
weiwang="50200" /> 
<item index="11" level="60" nickname="鬼鬼" country="金" 
weiwang="49537" /> 
<item index="12" level="59" nickname="狂龙在天" country="金" 
weiwang="46687" /> 
<item index="13" level="60" nickname="小子" country="金" 
weiwang="46152" /> 
<item index="14" level="52" nickname="zzy" country="金" 
weiwang="39017" /> 
<item index="15" level="53" nickname="ycf" country="金" 
weiwang="30333" /> 
<item index="16" level="52" nickname="无界之魂" country="金" 
weiwang="20294" /> 
<item index="17" level="42" nickname="刀锋狼" country="金" 
weiwang="18842" /> 
<item index="18" level="60" nickname="mnbvc" country="金" 
weiwang="18102" /> 
<item index="19" level="41" nickname="赢政" country="金" 
weiwang="16331" /> 
<item index="20" level="52" nickname="徐匡胤" country="金" 
weiwang="16156" /> 
</userlist> 
</ReturnInfo> 

2、具体解析程序如下： 

package demo4;

import java.io.File;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class TestJava {
	public static void main(String args[]) throws DocumentException {
		SAXReader reader = new SAXReader();
		Document document = reader.read(new File("D:/data.xml"));
		Element rootElm = document.getRootElement();
		Element root1Elm = rootElm.element("userlist");
		List nodes = root1Elm.elements("item");
		for (Iterator it = nodes.iterator(); it.hasNext();) {
			Element elm = (Element) it.next();
			System.out.println("index:" + elm.attributeValue("index")
					+ " level:" + elm.attributeValue("level") + " nickname:"
					+ elm.attributeValue("nickname") + " country:"
					+ elm.attributeValue("country") + " weiwang:"
					+ elm.attributeValue("weiwang"));
		}
		try {
			Document doc = reader.read(new File("D:/data.xml"));
			List projects = doc.selectNodes("ReturnInfo/userlist/item");
			Iterator it = projects.iterator();
			while (it.hasNext()) {
				Element elm = (Element) it.next();
				System.out.println("index:" + elm.attributeValue("index")
						+ " level:" + elm.attributeValue("level")
						+ " nickname:" + elm.attributeValue("nickname")
						+ " country:" + elm.attributeValue("country")
						+ " weiwang:" + elm.attributeValue("weiwang"));
			}

		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

}

3、运行结果如下图所示：

<1>、jaxen-1.1-beta-7.jar架包导入后不报异常，正常得到结果：

<2>、jaxen-1.1-beta-7.jar架包不导入后报异常，但也能得到结果：