心遠專欄

public ? void ?generateDocument()? ... {
???????? /**?*/ /**
?????????*?使用?DocumentHelper?類創建一個文檔實例。?
?????????*?DocumentHelper?是生成?XML?文檔節點的?dom4j?API?工廠類。
????????? */
????????Document?document? = ?DocumentHelper.createDocument();
???????? /**?*/ /**
?????????*?使用?addElement()?方法創建根元素?catalog?。?
?????????*?addElement()?用于向?XML?文檔中增加元素。
????????? */
????????Element?catalogElement? = ?document.addElement( " catalog " );
???????? /**?*/ /**
?????????*?在?catalog?元素中使用?addComment()?方法添加注釋“An?XML?catalog”。?
????????? */
????????catalogElement.addComment( " An?XML?catalog " );
???????? /**?*/ /**
?????????*?在?catalog?元素中使用?addElement()?方法增加?journal?元素。
????????? */
????????Element?journalElement? = ?catalogElement.addElement( " journal " );
???????? /**?*/ /**
?????????*?使用?addAttribute()?方法向?journal?元素添加?title?和?publisher?屬性。
????????? */
????????journalElement.addAttribute( " title " ,? " XML?Zone " );
????????journalElement.addAttribute( " publisher " ,? " IBM?developerWorks " );

???????? /**?*/ /**
?????????*?向?article?元素中添加?journal?元素。?
????????? */
????????Element?articleElement? = ?journalElement.addElement( " article " );
???????? /**?*/ /**
?????????*?為?article?元素增加?level?和?date?屬性。?
????????? */
????????articleElement.addAttribute( " level " ,? " Intermediate " );
????????articleElement.addAttribute( " date " ,? " December-2001 " );
???????? /**?*/ /**
?????????*?向?article?元素中增加?title?元素。?
????????? */
????????Element?titleElement? = ?articleElement.addElement( " title " );
???????? /**?*/ /**
?????????*?使用?setText()?方法設置?article?元素的文本。?
????????? */
????????titleElement.setText( " Java?configuration?with?XML?Schema " );
???????? /**?*/ /**
?????????*?在?article?元素中增加?author?元素。?
????????? */
????????Element?authorElement? = ?articleElement.addElement( " author " );
???????? /**?*/ /**
?????????*?在?author?元素中增加?firstname?元素并設置該元素的文本。?
????????? */
????????Element?firstNameElement? = ?authorElement.addElement( " firstname " );
????????firstNameElement.setText( " Macello " );
???????? /**?*/ /**
?????????*?在?author?元素中增加?lastname?元素并設置該元素的文本。?
????????? */
????????Element?lastNameElement? = ?authorElement.addElement( " lastname " );
????????lastNameElement.setText( " Vitaletti " );

???????? try ? ... {
????????????XMLWriter?output? = ? new ?XMLWriter( new ?FileWriter( new ?File(
???????????????????? " demo/catalog.xml " )));
????????????output.write(document);
????????????output.close();
????????} ? catch ?(IOException?e)? ... {
????????????e.printStackTrace();
????????}
}

<? xml?version="1.0"?encoding="UTF-8" ?>
< catalog >
<!-- An?XML?catalog -->
???? < journal? title ="XML?Zone" ?publisher ="IBM?developerWorks" >
???????? < article? level ="Intermediate" ?date ="December-2001" >
???????????? < title > Java?configuration?with?XML?Schema </ title >
???????????? < author >
???????????????? < firstname > Macello </ firstname >
???????????????? < lastname > Vitaletti </ lastname >
???????????? </ author >
???????? </ article >
???? </ journal >
</ catalog >

public ? void ?outPutInfo(String?filename) ... {
???????? try ? ... {?
????????????File?f? = ? new ?File(filename);?
????????????SAXReader?reader? = ? new ?SAXReader();?
????????????Document?doc? = ?reader.read(f);?
????????????
????????????List?list? = ?doc.selectNodes( " //article " );
????????????Iterator?iter? = ?list.iterator();
????????????
???????????? while ?(iter.hasNext())? ... {
????????????????Element?element? = ?(Element)?iter.next();
????????????????Element?nameElement? = ? null ;
????????????????Iterator?iterator? = ?element.elementIterator( " author " );
???????????????? while ?(iterator.hasNext())? ... {
????????????????????nameElement? = ?(Element)?iterator.next();
????????????????????System.out.println(nameElement.elementText( " firstname " ));
????????????????????System.out.println(nameElement.elementText( " lastname " ));
????????????????}
????????????}
????????} ? catch ?(Exception?e)? ... {?
????????????e.printStackTrace();?
????????} ?
????}

public ? void ?modifyDocument(String?filename)? ... {
???????? try ? ... {
????????????File?inputXml? = ? new ?File(filename);
????????????
????????????SAXReader?saxReader? = ? new ?SAXReader();
????????????Document?document? = ?saxReader.read(inputXml);

???????????? /**?*/ /**
?????????????*?inputXml?是從?catalog.xml?創建的?java.io.File。
?????????????*?使用?XPath?表達式從?article?元素中獲得?level?節點列表。
?????????????*?如果?level?屬性值是“Intermediate”則改為“Introductory”。?
????????????? */
????????????List?list? = ?document.selectNodes( " //article/@level " );
????????????Iterator?iter? = ?list.iterator();
???????????? while ?(iter.hasNext())? ... {
????????????????Attribute?attribute? = ?(Attribute)?iter.next();
???????????????? if ?(attribute.getValue().equals( " Intermediate " ))
????????????????????attribute.setValue( " Introductory " );
????????????}

????????????list? = ?document.selectNodes( " //article/@date " );
????????????iter? = ?list.iterator();
???????????? while ?(iter.hasNext())? ... {
????????????????Attribute?attribute? = ?(Attribute)?iter.next();
???????????????? if ?(attribute.getValue().equals( " December-2001 " ))
????????????????????attribute.setValue( " October-2002 " );

????????????}
????????????
???????????? /**?*/ /**
?????????????*?獲取?article?元素列表，從?article?元素中的?title?元素得到一個迭代器，并修改?title?元素的文本。?
????????????? */
????????????list? = ?document.selectNodes( " //article " );
????????????iter? = ?list.iterator();
???????????? while ?(iter.hasNext())? ... {
????????????????Element?element? = ?(Element)?iter.next();
????????????????Iterator?iterator? = ?element.elementIterator( " title " );
???????????????? while ?(iterator.hasNext())? ... {
????????????????????Element?titleElement? = ?(Element)?iterator.next();
???????????????????? if ?(titleElement.getText().equals(
???????????????????????????? " Java?configuration?with?XML?Schema " ))
????????????????????????titleElement
????????????????????????????????.setText( " Create?flexible?and?extensible?XML?Schema " );

????????????????}
????????????}

????????????list? = ?document.selectNodes( " //article/author " );
????????????iter? = ?list.iterator();
???????????? while ?(iter.hasNext())? ... {
????????????????Element?element? = ?(Element)?iter.next();
????????????????Iterator?iterator? = ?element.elementIterator( " firstname " );
???????????????? while ?(iterator.hasNext())? ... {
????????????????????Element?firstNameElement? = ?(Element)?iterator.next();
???????????????????? if ?(firstNameElement.getText().equals( " Marcello " ))
????????????????????????firstNameElement.setText( " Ayesha " );
????????????????}
????????????}

????????????list? = ?document.selectNodes( " //article/author " );
????????????iter? = ?list.iterator();
???????????? while ?(iter.hasNext())? ... {
????????????????Element?element? = ?(Element)?iter.next();
????????????????Iterator?iterator? = ?element.elementIterator( " lastname " );
???????????????? while ?(iterator.hasNext())? ... {
????????????????????Element?lastNameElement? = ?(Element)?iterator.next();
???????????????????? if ?(lastNameElement.getText().equals( " Vitaletti " ))
????????????????????????lastNameElement.setText( " Malik " );

????????????????}

????????????}
????????????XMLWriter?output? = ? new ?XMLWriter( new ?FileWriter( new ?File(
???????????????????? " catalog-modified.xml " )));
????????????output.write(document);
????????????output.close();
????????} ? catch ?(DocumentException?e)? ... {
????????????System.out.println(e.getMessage());
????????} ? catch ?(IOException?e)? ... {
????????????System.out.println(e.getMessage());
????????}
????}