I've searched but couldn't find what I need.
I need to open a XML file stored on FTP, then I have to list all nodes and insert a new one.
Look at the following XML example.
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>data2</loc>
<priority>1.0</priority>
</url>
<url>
<loc>data1</loc>
<priority>1.0</priority>
</url>
</urlset>
I am retrieving the file:
String filename = "test.xml";
String server = "...";
int port = 21;
String user = "...";
String pass = "...";
FTPClient ftpClient = new FTPClient();
ftpClient.connect(server, port);
ftpClient.login(user, pass);
ftpClient.enterLocalPassiveMode();
/*filePath deve ser o ftp?*/
FileOutputStream fos = new FileOutputStream(filename);
ftpClient.retrieveFile("folder/" + filename, fos);
Now, I would like to append another XML node inside this file, getting the following result for example: What means that I want to append before the 1st element of the XML -> n.insertBefore(NODE, n.getFirstChild()); Then save it on FTP again.
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>data3 - NEW DATA</loc>
<priority>1.0</priority>
</url>
<url>
<loc>data2</loc>
<priority>1.0</priority>
</url>
<url>
<loc>data1</loc>
<priority>1.0</priority>
</url>
</urlset>
I know that it is possible to do downloading the file, opening, appending and then uploading it. But in my case I can't do that. I must append the file instead overwritte it.
I can do this on LOCAL file stored as the following.
public class XMLWriter {
/*
* @param args the command line arguments
*/
public static void main(String[] args) throws Exception
{
MethodWrite2();
}
public static void MethodWrite2() throws org.xml.sax.SAXException, TransformerException, IOException, ParserConfigurationException
{
String filePath = "teste.xml";
File xmlFile = new File(filePath);
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder;
dBuilder = dbFactory.newDocumentBuilder();
Document doc;
doc = dBuilder.parse(xmlFile);
doc.getDocumentElement().normalize();
Node n = doc.getElementsByTagName("urlset").item(0);
ContadorDeNosXml(doc); // count Node numbers and print the content of an attribute of each node
/*cria uma lista de especiais a serem adicionados no XML*/
List<NovoEspecial> listaDeNovosEspeciais = new ArrayList<NovoEspecial>();
/*loop para adicionar um novo especial a lista de novos especiais que serão adicionados no XML*/
/*necessário correção -> OBS nr: (1)*/
for (int i = 0 ; i <= 10; i++)
{
/*pra cada 1, cria uma instancia e adiciona a lista de novos especiais a serem adicionados no XML*/
NovoEspecial novoEspecial = new NovoEspecial("data", Integer.toString(i));
listaDeNovosEspeciais.add(novoEspecial);
}
/*pra cada item da lista de novos especiais a serem adicionados no XML*/
for(NovoEspecial novoEspecial : listaDeNovosEspeciais)
{
Element urlTag = CreateXmlNode(doc, novoEspecial);
// INSERE NO INICIO/ANTES DO PRIMEIRO ELEMENTO, DESSA FORMA FICANDO DO MAIS NOVO PARA O MAIS ANTIGO
n.insertBefore(urlTag, n.getFirstChild());
}
doc.getDocumentElement().normalize();
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
//SETA IDENTAÇÃO NO PADRAO DO XML.APACHE COM 4 ESPAÇOS
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
DOMSource domSource = new DOMSource(doc);
StreamResult streamResult = new StreamResult(filePath);
transformer.transform(domSource, streamResult);
} //MethodWrite2
public static Element CreateXmlNode(Document doc, NovoEspecial novoEspecial)
{
// CRIA A TAG URL
Element urlTag = doc.createElement("url");
// CRIA A TAG LOC E ESCREVE DENTRO DELA O LINK DO NOVO ESPECIAL
Element loc = doc.createElement("loc");
loc.appendChild(doc.createTextNode(novoEspecial.getUrl()));
//CRIA A TAG PRIORITY E ESCREVE DENTRO DELA O VALOR ATRIBUIDO
Element priority = doc.createElement("priority");
priority.appendChild(doc.createTextNode( novoEspecial.getPriority()));
// ADICIONA AS TAGS PRIORITY E LOC DENTRO DA TAG URL
urlTag.appendChild(loc);
urlTag.appendChild(priority);
return urlTag;
}
public static void ContadorDeNosXml(Document doc)
{
NodeList nodeLst = doc.getElementsByTagName("url");
List<NovoEspecial> listaDeNovosEspeciais = new ArrayList<NovoEspecial>();
System.out.println(nodeLst.getLength());
for(int i =0; i < nodeLst.getLength(); i++)
{
Node locNode = doc.getElementsByTagName("loc").item(i);
Node priorityNode = doc.getElementsByTagName("priority").item(i);
NovoEspecial novoEspecial = new NovoEspecial(locNode.getTextContent(), priorityNode.getTextContent());
System.out.println("ContadorDeNosXml URL = " + novoEspecial.getUrl() );
System.out.println("ContadorDeNosXml Priority = " + novoEspecial.getPriority());
}
}
}
public class NovoEspecial
{
private String url;
private String priority;
//constructor
protected NovoEspecial(String url, String priority)
{
setUrl(url);
setPriority(priority);
}
//getters
public String getUrl()
{
return url;
}
public String getPriority()
{
return priority;
}
//setters
private void setUrl(String url)
{
this.url = url;
}
private void setPriority(String priority)
{
this.priority = priority;
}
}
Thanks for the help.
Searchs:
How can I write to a remote file using Apache Commons Net?
How do I append a node to an existing XML file in java
