使用dom4j和XPath

野草 — Wed, 08 Mar 2006 13:32:00 GMT

配置开发包

dom4j-1.6.1.jar

jaxen-1.1-beta-6.jar�Q?/SPAN>XPath必备�Q?/SPAN>

取某一节点

Element root = (Element) document.selectSingleNode("http://root");

取某一节点的属�?/SPAN>

Attribute attribute = (Attribute) document.selectSingleNode("http://root/cell/@value");

使用�l�验

我们在做�pȝ��间交互时�Q�通常通过自定义的xml文�g�q�行数据交换。例如：�pȝ��A需要向�pȝ��B传输一�?/SPAN>xml字串的条件如下：

�pȝ��A只需填充cell节点�?/SPAN>value属性��|��我的��是将�q�段xml写成本地文�g�Q�每�ơ传输时首先��d��xml文�g�Q�再�|?/SPAN>cell节点�?/SPAN>value属性��|��然后��?/SPAN>xml对象转变成字串传�l�系�l?/SPAN>B。这��L��优点是：一�?/SPAN>systemid="Darenkou" userid="admin" default="DA" icon="0000" 是传输参敎ͼ�当有所变动时只需修改本地文�g卛_��?/SPAN>

详细例程

test.xml

��理�?/SPAN>" value=""/>

XmlTest.java

import java.io.File;

import java.io.IOException;

import java.io.StringWriter;

import java.io.UnsupportedEncodingException;

import java.util.HashMap;

import java.util.Iterator;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.Element;

import org.dom4j.io.OutputFormat;

import org.dom4j.io.SAXReader;

import org.dom4j.io.XMLWriter;

public class XmlTest {

public static String generateXml(HashMap map) {

String strXml = null;

if (map != null) {

SAXReader reader = new SAXReader();

Document document = null;

try {

document = reader.read(new File("D:/test.xml"));

} catch (DocumentException e) {

e.printStackTrace();

}

Element root = (Element) document.selectSingleNode("http://root");

root.attribute("value").setValue("分布");

Iterator iter = map.keySet().iterator();

while (iter.hasNext()) {

String key = (String) iter.next();

String value = (String) map.get(key);

Element element = root.addElement("cell").addAttribute("value",

key);

element.addElement("element").addAttribute("type", "数�?/SPAN>")

.addAttribute("name", "人数").addText(value);

}

strXml = encodeXml(document, "gb2312");

}

return strXml;

}

private static String encodeXml(Document document, String aEncode) {

// �q�行�~�码转换

StringWriter sw = new StringWriter();

OutputFormat format = OutputFormat.createPrettyPrint();

format.setEncoding(aEncode);

try {

XMLWriter writer = new XMLWriter(format);

writer.setWriter(sw);

writer.write(document);

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return sw.toString();

}

public static void main(String[] args) {

HashMap map = new HashMap();

map.put("上�v", "200");

map.put("北京", "300");

map.put("天��|", "300");

System.out.println(generateXml(map));

}

野草 2006-03-08 21:32 发表评论

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使用dom4j和XPath