dom4j建立,修改,格式化输出XML文档

怎么用dom4j建立,修改,格式化输出XML文档?请教以下，谢谢

** 加入owner节点 */
Element ownerElement = booksElement.addElement("owner");
ownerElement.setText("O'Reilly");

try{

XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)));
writer.write(document);
writer.close();

returnValue = 1;
}catch(Exception ex){
ex.printStackTrace();
}

return returnValue;
}


public int ModiXMLFile(String filename,String newfilename){
int returnValue = 0;
try{
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(new File(filename));


List list = document.selectNodes("/books/book/@show" );
Iterator iter = list.iterator();
while(iter.hasNext()){
Attribute attribute = (Attribute)iter.next();
if(attribute.getValue().equals("yes")){
attribute.setValue("no");
}
}

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