JAVA使用Dom4j组装、解析XML

　　dom4j是一个Java的XML API，类似于jdom，用来读写XML文件的。dom4j是一个十分优秀的JavaXML API，具有性能优异、功能强大和极其易使用的特点，同时它也是一个开放源代码的软件，可以在SourceForge上找到它。在IBM developerWorks上面还可以找到一篇文章，对主流的Java XML API进行的性能、功能和易用性的评测，所以可以知道dom4j无论在哪个方面都是非常出色的。如今可以看到越来越多的Java软件都在使用dom4j来读写XML，特别值得一提的是连Sun的JAXM也在用dom4j。这已经是必须使用的jar包， Hibernate也用它来读写配置文件。

具体操作如下：
<?xml version="1.0" encoding="UTF-8"?>
<msg>
<content>
<name>xiaohua</name>
<address>china</address>
</content>
<other>
<car>
<carCode>99999</carCode>
<carNo xmlns:jsdl="http://www.ibm.com/xmlns/prod/scheduling/1.0/jsdl"

xmlns:jsdlws="http://www.ibm.com/xmlns/prod/scheduling/1.0/jsdlws"><![CDATA[<author>xiaoming</author>]]

></carNo>
</car>
</other>
</msg>

　　/**
* 组装XML
*/
public static void CreateXML(){
Document document = DocumentHelper.createDocument();
Element rootElement = document.addElement("msg");
Element contentElement = rootElement.addElement("content");
Element verElement = contentElement.addElement("name");
verElement.addText("xiaohua");
Element addressElement = contentElement.addElement("address");
addressElement.addText("china");
Element otherElement = rootElement.addElement("other");
Element carElement = otherElement.addElement("car");
Element taxOrgCodeElement = carElement.addElement("carCode");
taxOrgCodeElement.addText("99999");
Element carNoElement = carElement.addElement("carNo");
carNoElement.addNamespace("jsdl", "http://www.ibm.com/xmlns/prod/scheduling/1.0/jsdl");
carNoElement.addNamespace("jsdlws", "http://www.ibm.com/xmlns/prod/scheduling/1.0/jsdlws");
String cdataString = "<author>xiaoming</author>";
carNoElement.addCDATA(cdataString);

//文件输出
OutputFormat outputFormat = null;
try {
String fileName = "D:\\tmp\\test.xml";
outputFormat = OutputFormat.createPrettyPrint();
outputFormat.setEncoding("UTF-8");
XMLWriter xw = new XMLWriter(new FileOutputStream(fileName),outputFormat);
outputFormat.setNewLineAfterDeclaration(false);
xw.write(document);
xw.close();
} catch (Exception e) {
System.out.println(e);
}

}

　　/**
* 读取XML
*/
public static void readXML(){
try {
String filePath = "D:\\tmp\\test.xml";
SAXReader reader = new SAXReader();
Document document = reader.read(new File(filePath));
Element msgElement = document.getRootElement();
Element contentElement = msgElement.element("content");
Element varElement = contentElement.element("name");
String name = varElement.getText();
System.out.println("名字："+name);
Element otherElement = msgElement.element("other");
Element carHeadElement = otherElement.element("car");
Element taxorgCodeElement =carHeadElement.element("carCode");
System.out.println("carCode："+taxorgCodeElement.getText());
Element carNoElemnet = carHeadElement.element("carNo");
System.out.println("carNo："+carNoElemnet.getText());
Element documents = (Element)document.selectNodes("msg/other/car/carNo").get(0);
String s = documents.getStringValue();
System.out.println("s:"+s);
Document documentt = DocumentHelper.parseText(s);
Node node = documentt.selectSingleNode("author");
System.out.println("CDATA重的内容："+node.getStringValue());
} catch (Exception e) {
System.out.println(e);
}
}