How do I append a node to an existing XML file in java

Question

public static void addALLToXML Collection lt Server gt  svr  throws IOException        ParserConfigurationException  TransformerException       DocumentBuilderFactory documentBuilderFactory   DocumentBuilderFactory          newInstance        DocumentBuilder documentBuilder   documentBuilderFactory          newDocumentBuilder        Document document   documentBuilder newDocument            Root Element     Element rootElement   document createElement  Servers        document appendChild rootElement        for  Server i   svr                   server elements         Element server   document createElement  server            rootElement appendChild server            Element name   document createElement  name            name appendChild document createTextNode i getName              server appendChild name            Element port   document createElement  port            port appendChild document createTextNode Integer toString i getPort               server appendChild port              TransformerFactory transformerFactory   TransformerFactory newInstance        Transformer transformer   transformerFactory newTransformer        DOMSource source   new DOMSource document        StreamResult result   new StreamResult   home user server xml        transformer transform source  result       This is the function I need help with   public static void addNodeToXML String nameIn  String portIn        throws ParserConfigurationException  SAXException  IOException       DocumentBuilderFactory documentBuilderFactory   DocumentBuilderFactory              newInstance        DocumentBuilder documentBuilder   documentBuilderFactory              newDocumentBuilder            parse existing file to DOM        Document document   documentBuilder              parse new File   home user server xml             Root Element     Element rootElement   document createElement  Servers        document appendChild rootElement           server elements     Element server   document createElement  server        rootElement appendChild server        Element name   document createElement  name        name appendChild document createTextNode nameIn        server appendChild name        Element port   document createElement  port        port appendChild document createTextNode portIn        server appendChild port       Original    lt Servers gt    lt server gt     lt name gt something lt  name gt     lt port gt port lt  port gt    lt  server gt    lt  Servers gt    Wanted    lt Servers gt      lt server gt      lt name gt something lt  name gt      lt port gt port lt  port gt     lt  server gt     lt server gt      lt name gt something lt  name gt      lt port gt port lt  port gt     lt  server gt   lt Servers gt

User · Answer

You can parse the existing XML file into DOM and append new elements to the DOM  Very similar to what you did with creating brand new XML  I am assuming you do not have to worry about duplicate server  If you do have to worry about that  you will have to go through the  elements in the DOM to check for duplicates   DocumentBuilderFactory documentBuilderFactory   DocumentBuilderFactory newInstance    DocumentBuilder documentBuilder   documentBuilderFactory newDocumentBuilder        parse existing file to DOM    Document document   documentBuilder parse new File  exisgint xml file      Element root   document getDocumentElement     for  Server newServer   Collection lt Server gt  bunchOfNewServers     Element server   Document createElement  server         create and setup the server node        root appendChild server         use whatever method to output DOM to XML  for example  using transformer like you did

User · Answer

If you need to insert node element in some specific place   you can to do next steps   Divide original xml into two parts Append your new node element as child to first first the first part should ended with element after wich you wanna add your element   Append second part to the new document    It is simple algorithm but should works

User · Answer

You could use DOM4j doing that

User · Answer

To append a new data element just do this     Document doc   docBuilder parse is           Node root doc getFirstChild    Element newserver doc createElement  new server    root appendChild newserver     easy      is  is an InputStream object  rest is similar to your code    tried it just now

User · Answer

The following complete example will read an existing server xml file from the current directory  append a new Server and re-write the file to server xml  It does not work without an existing  xml file  so you will need to modify the code to handle that case   import java util    import javax xml transform    import javax xml transform stream    import javax xml transform dom    import org w3c dom    import javax xml parsers     public class AddXmlNode       public static void main String   args  throws Exception            DocumentBuilderFactory documentBuilderFactory   DocumentBuilderFactory newInstance            DocumentBuilder documentBuilder   documentBuilderFactory newDocumentBuilder            Document document   documentBuilder parse  server xml            Element root   document getDocumentElement             Collection lt Server gt  servers   new ArrayList lt Server gt             servers add new Server              for  Server server   servers                   server elements             Element newServer   document createElement  server                 Element name   document createElement  name                name appendChild document createTextNode server getName                  newServer appendChild name                Element port   document createElement  port                port appendChild document createTextNode Integer toString server getPort                   newServer appendChild port                root appendChild newServer                      DOMSource source   new DOMSource document            TransformerFactory transformerFactory   TransformerFactory newInstance            Transformer transformer   transformerFactory newTransformer            StreamResult result   new StreamResult  server xml            transformer transform source  result              public static class Server           public String getName     return  foo             public Integer getPort     return 12345              Example server xml file    lt  xml version  1 0  encoding  UTF-8  standalone  yes   gt   lt Servers gt     lt server gt       lt name gt something lt  name gt       lt port gt port lt  port gt     lt  server gt   lt  Servers gt    The main change to your code is not creating a new  root  element  The above example just uses the current root node from the existing server xml and then just appends a new Server element and re-writes the file

[java] How do I append a node to an existing XML file in java

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