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java dom4j解析xml实例

2014-07-11 16:30 288 查看
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:



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