Java: writing on XML file problems -


i working on application using java , xml file save settings language..

setting.xml

<?xml version="1.0" encoding="utf-8"?> <parametre>     <param name="langue" id="1">         <val>1</val>     </param>     <param name="controle" id="2">         <val>0</val>     </param> </parametre>

this class should read , write xml file.

import java.io.file;  import javax.xml.parsers.documentbuilderfactory; import javax.xml.parsers.documentbuilder;  import org.w3c.dom.document; import org.w3c.dom.nodelist; import org.w3c.dom.node; import org.w3c.dom.element;  public class dialxmlfile {      private static boolean _initialized = false;     private static boolean _init = false;     private static document _docx,_docy;  public static void initlang() {     if(_initialized) {         return;     }      try {         file fxmlfile = new file("res/files/strings.xml");         documentbuilderfactory dbfactory = documentbuilderfactory.newinstance();         documentbuilder dbuilder = dbfactory.newdocumentbuilder();         _docx = dbuilder.parse(fxmlfile);         _docx.getdocumentelement().normalize();          _initialized = true;     } catch (exception e) {         e.printstacktrace();     } }  public static void initparam() {     if(_init) {         return;     }      try {         file fxmlfile = new file("res/files/setting.xml");         documentbuilderfactory dbfactory = documentbuilderfactory.newinstance();         documentbuilder dbuilder = dbfactory.newdocumentbuilder();         _docy = dbuilder.parse(fxmlfile);         _docy.getdocumentelement().normalize();          _init = true;     } catch (exception e) {         e.printstacktrace();     } }  public static string readlbl(string name, int lang) {     if(!_initialized) {         initlang();     }      string res = "";      try {         nodelist nlist = _docx.getelementsbytagname("lang");         node nnode = nlist.item(lang);         if (nnode.getnodetype() == node.element_node) {             element eelement = (element) nnode;             res=eelement.getelementsbytagname(name).item(0).gettextcontent();         }     } catch (exception e) {         res="$error";         e.printstacktrace();     }      return res; }  public static int readctrl() {     if(!_init) {         initparam();     }      int rs = 0;      try {         nodelist nparamlist = _docy.getelementsbytagname("param");         node nparamnode = nparamlist.item(1);         if (nparamnode.getnodetype() == node.element_node) {             element eparamelement = (element) nparamnode;             rs=integer.parseint(eparamelement.getelementsbytagname("val").item(0).gettextcontent());         }     } catch (exception e) {         e.printstacktrace();     }      return rs; }  public static int readlang() {     if(!_init) {         initparam();     }      int rs = 0;      try {         nodelist nparamlist = _docy.getelementsbytagname("param");         node nparamnode = nparamlist.item(0);         if (nparamnode.getnodetype() == node.element_node) {             element eparamelement = (element) nparamnode;             rs=integer.parseint(eparamelement.getelementsbytagname("val").item(0).gettextcontent());         }     } catch (exception e) {         e.printstacktrace();     }      return rs; }  public static void writelang(string i) {     initparam();     try {         nodelist nparamlist = _docy.getelementsbytagname("param");         node nparamnode = nparamlist.item(0);         if (nparamnode.getnodetype() == node.element_node) {             element eparamelement = (element) nparamnode;             eparamelement.getelementsbytagname("val").item(0).settextcontent(i);         }     } catch (exception e) {         e.printstacktrace();     }    }  public static void writectrl(string i) {     initparam();     try {         nodelist nparamlist = _docy.getelementsbytagname("param");         node nparamnode = nparamlist.item(1);         if (nparamnode.getnodetype() == node.element_node) {             element eparamelement = (element) nparamnode;             eparamelement.getelementsbytagname("val").item(0).settextcontent(i);         }     } catch (exception e) {         e.printstacktrace();     }        }  }

but can't write anything..! note read correctly , not give error or exception when excute. ideas or help.

your approach error prone , not scalable/customizable. if looking read in xml java code , have access values set there, recommend @ jaxb or library fasterxml jackson. let map xml files java objects , back. example, start of implementation jaxb:

@xmlrootelement @xmlaccessortype(xmlaccesstype.field) @xmltype(name = "parametre") public class parametre {     list<param> params; }  @xmltype(name = "param") public class param {     @xmlattribute(name = "required")     string name;     string value; }

you have access data through normal java objects.


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