java - How to export JTree data as XML file by using JDOM -


i have jtree , need save each child level element save xml, tried using below code implement it, gives errors converting numeric data of xml document,

error message :

exception in thread "awt-eventqueue-0" org.jdom2.illegalnameexception: name "1001" not legal jdom/xml elements: xml name '1001' cannot begin character "1".     @ org.jdom2.element.setname(element.java:227)     @ org.jdom2.element.<init>(element.java:161)     @ org.jdom2.element.<init>(element.java:173)

error pointed to, element el = new element(node.tostring());

what may cause error?

// save xml file has been modified.     private void savemsg(treemodel model) {                  filefilter filter = new filenameextensionfilter("xml files (*.xml)","xml");             filechooser.addchoosablefilefilter(filter);             filechooser.setcurrentdirectory(new file(""));             filechooser.setdialogtitle("save xml file");                          if (filechooser.showsavedialog(frame) == jfilechooser.approve_option){                 //file file = filechooser.getselectedfile();                 treemodel tmodel = xmltree.getmodel();                               int childcount = tmodel.getchildcount(tmodel.getroot());                 logger.info("messages sent : " + childcount);                  for(int i=0; i<childcount; i++){                     // go through each xml messages.                     jtree2xml(tmodel.getchild(tmodel.getroot(), i));                  }                                }            } // end of save xml file.         private void jtree2xml(object node) {                        document doc = new document();                       element root = createtree(doc, xmltree.getmodel(), node);                            doc.addcontent(root);                        xmloutputter out = new xmloutputter(format.getprettyformat());                           try {                 out.output(doc, system.out);                 out.output(doc, new filewriter(file));                 system.out.println("saved xml file...");             } catch (ioexception e) {                 e.printstacktrace();                 logger.error("xml file saving error : ");             }     } // end of method.        // read through document's elements.     private static element createtree(document doc, treemodel model, object node) {                  **element el = new element(node.tostring());**                   (int = 0; < model.getchildcount(node); i++) {                        object child = model.getchild(node, i);             el.addcontent(createtree(doc, model, child));                    } // end of while loop.         return el;     }

the message jdom clear. element name cannot start character '1'. comes xml spec http://www.w3.org/tr/2004/rec-xml11-20040204/#nt-namestartchar

you should use fixed name element, , put jtree node tostring in attribute.

 <jtreenode value="1001"/>

rolfl


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