例1:
/**
*使用DOM4J 创建XML文档并输入带控制台
* @author YZB
*/
publicclass Dom4jTest {
publicstaticvoid main(String[] args) {
// 构造Document对象
Document doc=DocumentHelper.createDocument();
// 一个XML处理指令
doc.addProcessingInstruction("xml-stylesheet"," type='text/xsl' href='student.xsl'");
Element root=doc.addElement("students");
//创建跟节点
//Element root=DocumentHelper.createElement("students");
//doc.setRootElement(root);//注意:用这种方法会把先前添加的处理指令清除掉,但在JDOM中不会清除
//添加节点对象
Element eltstu1=root.addElement("student");
Element eltname1=eltstu1.addElement("name");
Element eltage1=eltstu1.addElement("age");
eltname1.setText("张三");
eltage1.setText("27");
Element eltstu2=root.addElement("student");
Element eltname2=eltstu2.addElement("name");
Element eltage2=eltstu2.addElement("age");
eltname2.setText("张三");
eltage2.setText("27");
//创建输出格式对象
OutputFormat outfmt=new OutputFormat(" ",true,"gb2312");
XMLWriter xmlwriter=null;
try {
//创建输入流
//PrintWriter pw=new PrintWriter(System.out);
//doc.write(pw);
xmlwriter=new XMLWriter(new FileWriter("Dom4jstudent.xml"),outfmt);
xmlwriter.write(doc);
} catch (IOException e) {
e.printStackTrace();
}finally{
//pw.close();
try {
xmlwriter.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
例2:
* 使用访问者模式遍历文档树。根据不同的节点进行不同的操作
* 访问者模式通常用于处理对象树结构,树中的每一个节点对象都可以接受一个访问者对象,
* 节点对象向访问者对象传递自身,而访问者对象则反过来调用节点对象的操作
publicclass VisitorTest {
SAXReader saxReader=new SAXReader();
try {
Document doc=saxReader.read(new File("student.xml"));
doc.accept(new MyVisitor());
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
publicclass MyVisitor extends VisitorSupport{
@Override
publicvoid visit(Attribute node) {
System.out.println("Attribute:"+node.getName()+"="+node.getValue());
}
publicvoid visit(Element node) {
if(node.isTextOnly()){
System.out.println("Element"+node.getName()+" "+node.getText());
}else{
System.out.println("----------"+node.getName()+"----------");
publicvoid visit(ProcessingInstruction node) {
System.out.println("PI:"+node.getTarget()+" "+node.getText());
例3:
* dom4j基于事件的处理,不用解析完文档,在处理,
* 边解析边处理
*
publicclass ElementHandler {
SAXReader saxReader=new SAXReader();
saxReader.addHandler("/students/student",new StudentHandler());
saxReader.read(new File("student.xml"));
} catch (DocumentException e) {
// TODO Auto-generated catch block
publicclass StudentHandler implements ElementHandler {
@Override
publicvoid onStart(ElementPath arg0) {
Element elt=arg0.getCurrent();//返回当前元素
System.out.println("Found studen:t"+elt.attributeValue("id"));//这将返回sn属性的值
arg0.addHandler("name",new NameHander());//创建一个处理程序元素的对象
publicvoid onEnd(ElementPath arg0) {
arg0.removeHandler("name");
//ElementHandler接口定义了一个处理程序元素的对象
publicclass NameHander implements ElementHandler {
publicvoid onStart(ElementPath arg0) {
System.out.println(arg0.getPath());//这将返回路径
publicvoid onEnd(ElementPath arg0) {
Element elt=arg0.getCurrent();
System.out.println(elt.getName()+":"+elt.getText());
}
原文链接:https://www.f2er.com/xml/300452.html