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| package mms.tools;
import getfiles.GetCounter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Text;
//For jdk1.5 with built in xerces parser
//import com.sun.org.apache.xml.internal.serialize.OutputFormat;
//import com.sun.org.apache.xml.internal.serialize.XMLSerializer;
//For JDK 1.3 or JDK 1.4 with xerces 2.7.1
import org.apache.xml.serialize.XMLSerializer;
import org.apache.xml.serialize.OutputFormat;
public class WriteMsg2 {
//No generics
Document dom;
public WriteMsg2() {
//Get a DOM object
createDocument();
}
/**
* Using JAXP in implementation independent manner create a document object
* using which we create a xml tree in memory
*/
private void createDocument() {
//get an instance of factory
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
//get an instance of builder
DocumentBuilder db = dbf.newDocumentBuilder();
//create an instance of DOM
dom = db.newDocument();
}catch(ParserConfigurationException pce) {
//dump it
System.out.println("Error while trying to instantiate DocumentBuilder " + pce);
System.exit(1);
}
}
/**
* The real workhorse which creates the XML structure
*/
private void createDOMTree(String user,String subject,String content,int priority){
//create the root element <Messages>
Element rootEle = dom.createElement("Messages");
dom.appendChild(rootEle);
//create <Messages> element and attach it to root
Element messagesEle = createMessageElement(user,subject,content,priority);
rootEle.appendChild(messagesEle);
}
/**
* Helper method which creates a XML element <Message>
* @param The message for which we need to create an xml representation
* @return XML element snippet representing a message
*/
private Element createMessageElement(String user,String subject,String content,int priority){
String MESSAGE = "MSG";
Element messageEle = dom.createElement("Message");
//create user element and user text node and attach it to bookElement
Element idEle = dom.createElement("ID");
GetCounter cnt = new GetCounter();
int CNT_CNT = cnt.addCounter(MESSAGE, true);
Text idText = dom.createTextNode(CNT_CNT+"");
idEle.appendChild(idText);
messageEle.appendChild(idEle);
//create user element and user text node and attach it to bookElement
Element authEle = dom.createElement("USER");
Text authText = dom.createTextNode(user);
authEle.appendChild(authText);
messageEle.appendChild(authEle);
//create subject element and subject text node and attach it to bookElement
Element titleEle = dom.createElement("SUBJECT");
Text titleText = dom.createTextNode(subject);
titleEle.appendChild(titleText);
messageEle.appendChild(titleEle);
//create content element and content text node and attach it to bookElement
Element contentEle = dom.createElement("CONTENT");
Text contentText = dom.createTextNode(content);
contentEle.appendChild(contentText);
messageEle.appendChild(contentEle);
//create priority element and priority text node and attach it to bookElement
Element priorityEle = dom.createElement("PRIORITY");
Text priorityText = dom.createTextNode(priority+"");
priorityEle.appendChild(priorityText);
messageEle.appendChild(priorityEle);
return messageEle;
}
/**
* This method uses Xerces specific classes
* prints the XML document to file.
*/
private void printToFile(){
try
{
//print
OutputFormat format = new OutputFormat(dom);
format.setIndenting(true);
//to generate output to console use this serializer
//XMLSerializer serializer = new XMLSerializer(System.out, format);
//to generate a file output use fileoutputstream instead of system.out
XMLSerializer serializer = new XMLSerializer(
new FileOutputStream(new File("messages.xml")), format);
serializer.serialize(dom);
} catch(IOException ie) {
ie.printStackTrace();
}
}
public void wMsg(String user,String subject,String content,int priority) {
//create an instance
WriteMsg2 xce = new WriteMsg2();
//run
System.out.println("Started .. ");
createDOMTree(user,subject,content,priority);
printToFile();
System.out.println("Generated file successfully.");
}
} |
Ajouter des éléments à un document XML
) ce que je voudrais c'est le modifier pour ne plus écraser le fichier mais bien seulement ajouter l'enregistrement passé en parametre....
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