dom4j中添加节点,修改节点,删除节点

public class Dom4jDemo {

public Dom4jDemo() {

}

/**

* 建立一个XML文档,文档名由输入参数决定

* @param filename 需建立的文件名

* @return 返回操作结果, 0表失败, 1表成功

*/

public int createXMLFile(String filename){

/** 返回操作结果, 0表失败, 1表成功 */

int returnValue = 0;

/** 建立document对象 */

Document document = DocumentHelper.createDocument();

/** 建立XML文档的根books */

Element booksElement = document.addElement("books");

/** 加入一行注释 */

booksElement.addComment("This is a test for dom4j, holen, 2004.9.11");

/** 加入第一个book节点 */

Element bookElement = booksElement.addElement("book");

/** 加入show参数内容 */

bookElement.addAttribute("show","yes");

/** 加入title节点 */

Element titleElement = bookElement.addElement("title");

/** 为title设置内容 */

titleElement.setText("Dom4j Tutorials");



/** 类似的完成后两个book */

bookElement = booksElement.addElement("book");

bookElement.addAttribute("show","yes");

titleElement = bookElement.addElement("title");

titleElement.setText("Lucene Studing");

bookElement = booksElement.addElement("book");

bookElement.addAttribute("show","no");

titleElement = bookElement.addElement("title");

titleElement.setText("Lucene in Action");



/** 加入owner节点 */

Element ownerElement = booksElement.addElement("owner");

ownerElement.setText("O'Reilly");



try{

/** 将document中的内容写入文件中 */
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding( "UTF-8");

XMLWriter writer = new XMLWriter(new FileOutputStream(new File(filename)),format);

writer.write(document);

writer.close();

/** 执行成功,需返回1 */

returnValue = 1;

}catch(Exception ex){

ex.printStackTrace();

}



return returnValue;

}



/**

* 修改XML文件中内容,并另存为一个新文件

* 重点掌握dom4j中如何添加节点,修改节点,删除节点

* @param filename 修改对象文件

* @param newfilename 修改后另存为该文件

* @return 返回操作结果, 0表失败, 1表成功

*/

public static int ModiXMLFile(String filename,String newfilename,ItemVo itemvo){

int returnValue = 0;

try{

SAXReader saxReader = new SAXReader();

Document document = saxReader.read(new File(filename));

/** 修改内容之三: 若title内容为Dom4j Tutorials,则删除该节点 */

List list = document.selectNodes("/bcaster/item/@id");
Iterator iter = list.iterator();
int length=0;
while(iter.hasNext()){
Attribute attribute = (Attribute)iter.next();
if(attribute.getValue().equals(itemvo.getId()))
{
length=attribute.getParent().attributes().size();
if(length>2){
attribute.getParent().attribute(0).setValue(itemvo.getItem_url());
attribute.getParent().attribute(1).setValue(itemvo.getLink());
attribute.getParent().attribute(2).setValue(itemvo.getId());
}else
{
document.getRootElement().remove(attribute.getParent());
Element emp1Element = DocumentHelper.createElement("item");
emp1Element.addAttribute("item_url", itemvo.getItem_url());
emp1Element.addAttribute("link", itemvo.getLink());
emp1Element.addAttribute("id", itemvo.getId());
emp1Element.addAttribute("titleName", itemvo.getTitleName());
document.getRootElement().add(emp1Element);
}
}

}

try{

/** 将document中的内容写入文件中 */
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding( "UTF-8");

XMLWriter writer = new XMLWriter(new FileOutputStream(new File(newfilename)),format);

writer.write(document);

writer.close();

/** 执行成功,需返回1 */
Dom4jDemo.formatXMLFile(newfilename);

returnValue = 1;

}catch(Exception ex){

ex.printStackTrace();

}



}catch(Exception ex){

ex.printStackTrace();

}

return returnValue;

}


/******
* 更新xml文件中的属性
* @param filename
* @param newfilename
* @param itemvo
* @return
* xml文件 ,节点位置 使用xPath比如://book[@type='society'],节点名称, 节点新值
* @return 返回操作结果, 0表失败, 1表成功
*/
public static int updateXMLFileAttribute(String filePathAndName,String newfilePathAndName,String noteXPath,String[] attributeName,String[] attributeValue)
{
try {
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(new File(filePathAndName));

//获取节点位置
Element noteElement=(Element)document.selectSingleNode(noteXPath);

if(attributeName!=null && attributeValue!=null && attributeName.length == attributeValue.length)
{
for(int j=0;j<attributeName.length;j++)
{
Attribute attribute = noteElement.attribute(attributeName[j]);
//System.out.print("属性名:"+attribute.getName()+" 属性值:"+attribute.getValue());
//移除属性
if(attribute!=null)
{
noteElement.remove(attribute);
noteElement.addAttribute(attributeName[j], attributeValue[j]);
}
}

}

/** 将document中的内容写入文件中 */
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding( "UTF-8");

XMLWriter writer = new XMLWriter(new FileOutputStream(new File(newfilePathAndName)),format);

writer.write(document);

writer.close();

/** 执行成功,需返回1 */
Dom4jDemo.formatXMLFile(newfilePathAndName);

return 1;


} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return 0;
}




public static int deleteXMLFile(String filename,String newfilename,ItemVo itemvo){

int returnValue = 0;

try{

SAXReader saxReader = new SAXReader();

Document document = saxReader.read(new File(filename));

/** 修改内容之三: 若title内容为Dom4j Tutorials,则删除该节点 */

List list = document.selectNodes("/bcaster/item/@id");
Iterator iter = list.iterator();
while(iter.hasNext()){
Attribute attribute = (Attribute)iter.next();
if(attribute.getValue().equals(itemvo.getId())){
document.getRootElement().remove(attribute.getParent());
}

}
try{

/** 将document中的内容写入文件中 */
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding( "UTF-8");
XMLWriter writer = new XMLWriter(new FileOutputStream(new File(newfilename)),format);
writer.write(document);

writer.close();

/** 执行成功,需返回1 */
Dom4jDemo.formatXMLFile(filename);

returnValue = 1;

}catch(Exception ex){

ex.printStackTrace();

}



}catch(Exception ex){

ex.printStackTrace();

}

return returnValue;

}
public static int addXMLFile(String filename,String newfilename,ItemVo itemvo){

int returnValue = 0;

try{

SAXReader saxReader = new SAXReader();

Document document = saxReader.read(new File(filename));

// 添加员工节点 "employee"
Element emp1Element = DocumentHelper.createElement("item");
emp1Element.addAttribute("item_url", itemvo.getItem_url());
emp1Element.addAttribute("link", itemvo.getLink());
emp1Element.addAttribute("id", itemvo.getId());
emp1Element.addAttribute("titleName", itemvo.getTitleName());
document.getRootElement().add(emp1Element);

try{

/** 将document中的内容写入文件中 */
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding( "UTF-8");
XMLWriter writer = new XMLWriter( new FileOutputStream(new File(newfilename)),format);

writer.write(document);

writer.close();

/** 执行成功,需返回1 */
Dom4jDemo.formatXMLFile(filename);

returnValue = 1;

}catch(Exception ex){

ex.printStackTrace();

}



}catch(Exception ex){

ex.printStackTrace();

}

return returnValue;

}
public static List loadItemList(String filename){

List list=new ArrayList();

try{

SAXReader saxReader = new SAXReader();

Document document = saxReader.read(new File(filename));

List xmllist= document.selectNodes("/bcaster/item");
for (int i = 0, n = xmllist.size(); i < n; i++)

{
ItemVo itemvo=new ItemVo();

DefaultElement itemElement = (DefaultElement) xmllist.get(i);
String item_url = itemElement.attributeValue("item_url");
String link = itemElement.attributeValue("link");
String id = itemElement.attributeValue("id");
String titleName = itemElement.attributeValue("titleName");

itemvo.setId(id);
itemvo.setItem_url(item_url);
itemvo.setLink(link);
itemvo.setTitleName(titleName);
list.add(itemvo);

// System.out.println(item_url + "===========" + link);

}


}catch(Exception ex){

ex.printStackTrace();

}

return list;

}



/**

* 格式化XML文档,并解决中文问题

* @param filename

* @return

*/

public static int formatXMLFile(String filename){

int returnValue = 0;

try{

SAXReader saxReader = new SAXReader();

Document document = saxReader.read(new File(filename));

XMLWriter output = null;

/** 格式化输出,类型IE浏览一样 */

OutputFormat format = OutputFormat.createPrettyPrint();

/** 指定XML字符集编码 */

format.setEncoding("UTF-8");

output = new XMLWriter(new FileOutputStream(new File(filename)),format);

output.write(document);

output.close();

/** 执行成功,需返回1 */

returnValue = 1;

}catch(Exception ex){

ex.printStackTrace();

}

return returnValue;

}

}