dom4j的用法

package xml;


import java.io.FileWriter;


import java.io.IOException;


import java.util.Iterator;




import org.dom4j.Document;


import org.dom4j.DocumentException;


import org.dom4j.DocumentHelper;


import org.dom4j.Element;


import org.dom4j.io.OutputFormat;


import org.dom4j.io.SAXReader;


import org.dom4j.io.XMLWriter;






public class TestXML ...{


//创建XML文档




public static Document createDocument() ...{


Document document = DocumentHelper.createDocument();


Element root = document.addElement( "root" );




Element author1 = root.addElement( "author" )


.addAttribute( "name", "James" )


.addAttribute( "location", "UK" )


.addText( "James Strachan" );




Element author2 = root.addElement( "author" )


.addAttribute( "name", "Bob" )


.addAttribute( "location", "US" )


.addText( "Bob McWhirter" );




return document;


}


//将文档内容输出到文件或控制台




public static void write(Document document) throws IOException ...{




// lets write to a file


XMLWriter writer = new XMLWriter(


new FileWriter( "output.xml" )


);


writer.write( document );


writer.close();






// Pretty print the document to System.out


OutputFormat format = OutputFormat.createPrettyPrint();


writer = new XMLWriter( System.out, format );


writer.write( document );




// Compact format to System.out


format = OutputFormat.createCompactFormat();


writer = new XMLWriter( System.out, format );


writer.write( document );


}


//解析XML文件成Document ,url为文件路径




public static Document parse(String url) throws DocumentException ...{


SAXReader reader = new SAXReader();


Document document = reader.read(url);


return document;


}


//read Docment内容




public static void read(Document document) throws DocumentException ...{




Element root = document.getRootElement();




// 从XML的根结点开始遍历




for ( Iterator i = root.elementIterator(); i.hasNext(); ) ...{


Element element = (Element) i.next();


System.out.println(element.getName()+":"+element.getText());


}






/**//* // iterate through child elements of root with element name "foo"


for ( Iterator i = root.elementIterator( "foo" ); i.hasNext(); ) {


Element foo = (Element) i.next();


// do something


}




// iterate through attributes of root


for ( Iterator i = root.attributeIterator(); i.hasNext(); ) {


Attribute attribute = (Attribute) i.next();


// do something


}*/


}




//将document转化为String




public static String XmlToString(Document document)...{


return document.asXML();


}




//将document转化为String




public static Document StringToDocument(String text)...{




try ...{


return DocumentHelper.parseText(text);




} catch (DocumentException e) ...{


// TODO Auto-generated catch block


e.printStackTrace();


return null;


}


}




public static void main(String[] args) throws IOException, DocumentException ...{


// write(parse("E:/WebService/XFire/example/XFire/output.xml"));


String str="<?xml version='1.0' encoding='utf-16'?> "+


"<CurrentWeather>"+


"<Location>Shanghai / Hongqiao, China (ZSSS) 31-10N 121-26E 3M</Location>"+


"<Time>Aug 22, 2007 - 09:00 PM EDT / 2007.08.23 0100 UTC</Time>"+


"<Wind> from the ESE (110 degrees) at 7 MPH (6 KT) (direction variable):0</Wind>"+


"<Visibility> 4 mile(s):0</Visibility>"+


"<SkyConditions> mostly clear</SkyConditions>"+


"<Temperature> 87 F (31 C)</Temperature>"+


"<DewPoint> 78 F (26 C)</DewPoint>"+


"<RelativeHumidity> 74%</RelativeHumidity>"+


"<Pressure> 29.77 in. Hg (1008 hPa)</Pressure>"+


"<Status>Success</Status>"+


"</CurrentWeather>";


write(StringToDocument(str));


}


}



SAX解析xml

1、使用绝对路径

// 解析XML文件成Document ,url为文件路径
SAXReader reader = new SAXReader();
Document document = null;

String xmlFilePath = "d:/serialComm.xml";

document = reader.read(xmlFilePath);
InitSMSCat.log.info("串口配置文件的目录："+xmlFilePath);

if(document == null)
{
InitSMSCat.log.info("配置文件serialComm.xml读取发生错误！！！");
throw new Exception("配置文件serialComm.xml读取发生错误！！！");

}
// read Docment内容
Element root = document.getRootElement();

// 从XML的根结点开始遍历
for (Iterator i = root.elementIterator(); i.hasNext();)
{
Element element = (Element) i.next();
if(element.getName().equals("comm")) comm = element.getText();
}

2、使用环境变量

// 解析XML文件成Document ,url为文件路径
SAXReader reader = new SAXReader();
Document document = null;

InitSMSCat.log.info("环境变量SMS_HOME = "+System.getenv("SMS_HOME"));

String xmlFilePath = "";
if(Utility.getOsName().equals("windows"))
xmlFilePath = System.getenv("SMS_HOME")+"";
if(Utility.getOsName().equals("linux"))
xmlFilePath = (System.getenv("SMS_HOME")+"/config/serialComm.xml").replace("\\", "/");

document = reader.read(xmlFilePath);
InitSMSCat.log.info("串口配置文件的目录："+xmlFilePath);

if(document == null)
{
InitSMSCat.log.info("配置文件serialComm.xml读取发生错误！！！");
throw new Exception("配置文件serialComm.xml读取发生错误！！！");

}
// read Docment内容
Element root = document.getRootElement();

// 从XML的根结点开始遍历
for (Iterator i = root.elementIterator(); i.hasNext();)
{
Element element = (Element) i.next();
if(element.getName().equals("comm")) comm = element.getText();
}

3、读取jar包中的xml文件

// 解析XML文件成Document ,url为文件路径
SAXReader reader = new SAXReader();
Document document = null;

document = reader.read(this.getClass().getResourceAsStream("/serialComm.xml"));
if(document == null)
{
InitSMSCat.log.info("配置文件serialComm.xml读取发生错误！！！");
throw new Exception("配置文件serialComm.xml读取发生错误！！！");

}
// read Docment内容
Element root = document.getRootElement();

// 从XML的根结点开始遍历
for (Iterator i = root.elementIterator(); i.hasNext();)
{
Element element = (Element) i.next();
if(element.getName().equals("comm")) comm = element.getText();
}