kxml2 and J2ME

[nadiuska]

Hello. I am working with kxml2 in order to modify a xml document. My aim is to add some new fields when pressing a command button of my MIDLET.
I got taking the data from the file and display it on my MIDLET. However, i dont know how to modify the content of the xml document from my midlet.

I will aprecciate some code examples that could help me to solve this.

Thanks in advance

nadiuska

[honest_success]

Hello. I am working with kxml2 in order to modify a xml document. My aim is to add some new fields when pressing a command button of my MIDLET.
I got taking the data from the file and display it on my MIDLET. However, i dont know how to modify the content of the xml document from my midlet.

I will aprecciate some code examples that could help me to solve this.

Thanks in advance

nadiuska

Hi there will be some methods to add xml element in it. Did you read this article

[senthil_k]

Hi,
please try this:
Document doc = new Document();
XmlSerializer serializer = new KXmlSerializer();
StringWriter writer = new StringWriter();
serializer.setOutput(writer);
doc.write(serializer);

Element element = doc.getRootElement();
element.setName("ROOT");
Element childElement = doc.createElement(null, "CHILD_ELEMENT");

element.addChild(Node.ELEMENT, CHILD_ELEMENT);
Regards
Senthil

[nadiuska]

Thanks a lot for your replies. However i had some problems with them.

<senthil_k> StringWriter is not available in J2ME,at least in java.io.StringWriter.

<honest_success> good examples,but they do not show how to modify the data from the xml file.

The fact is that i know how to make a file in J2ME,as follows:

try{

FileConnection fc = (FileConnection) Connector.open(path,Connector.READ_WRITE);
if (!fc.exists())
fc.create();

OutputStream os = fc.openOutputStream();
String xmlText="any text...";
byte data[]=xmlTest.getBytes();
os.write(data);
fc.close();

}
catch(Exception e){
e.printStackTrace();
}
And i also know how to serialize a document with KXML2,as follows:

Document doc = new Document();
doc.setEncoding("ISO-8859-1");
XmlSerializer serializer = new KXmlSerializer();
Element listaRepartos = doc.createElement("","ListaRepartos");
listaRepartos.setAttribute(null,"id","1");
doc.addChild(Node.ELEMENT, listaRepartos);
...
StringWriter is the problem,as it is not available in J2ME
/*StringWriter writer=new StringWriter();
serializer.setOutput(writer);
doc.write(serializer);
*/

But i do not know how to link both of them!

Thanks for the help

[grahamhughes]

Hmmm... I haven't used KXML for years... but how about:

Document doc = new Document();

// more code...

OutputStream out = fc.openOutputStream();
OutputStreamWriter writer = new OutputStreamWriter(out);
try {
    XmlSerializer serializer = new KXmlSerializer();
    serializer.setOutput(writer);
    doc.write(serializer);
} finally {
    writer.close();
} 

Any help?

Cheers,
Graham.

[nadiuska]

Thank u very much. However,i get a NullPointerException in OutputStream os. This is the code:

try{
String path="file:///C:/Data/Images/";
FileConnection fc = (FileConnection) Connector.open(path+"oleola.xml", Connector.READ_WRITE);
if (!fc.exists())
fc.create();
OutputStream os = fc.openOutputStream(); //HERE NULL POINTEREXCEPTION
writer = new OutputStreamWriter(os);
serializer.setOutput(writer);
doc.write(serializer);
}
finally {
writer.close();
}

Thanks

[nadiuska]

My mistake.It has worked! I forgot deleting wrong code that i had before.

I put the entire code so that other developers can use it.

try {

//Create the XML Document structure
Document doc = new Document();
doc.setEncoding("ISO-8859-1");

XmlSerializer serializer = new KXmlSerializer();

Element principal = doc.createElement("","ListaRepartos");
listaRepartos.setAttribute(null,"id","1");
doc.addChild(Node.ELEMENT, principal);

//Create the output file which will be located in path
OutputStreamWriter writer=null;
FileConnection fc=null;
try{
String path="file:///C:/Data/Images/";
fc = (FileConnection) Connector.open(path+"oleola.xml", Connector.READ_WRITE);
if (!fc.exists())
fc.create();
OutputStream os = fc.openOutputStream();
writer = new OutputStreamWriter(os);
serializer.setOutput(writer);
doc.write(serializer);
}
finally {
writer.close();
fc.close();
}

}
catch (Exception exception) {
exception.printStackTrace();

}

Thanks guys!!

[dave33]

Thanks for your sample !
It's helping me a lot !

By any chance, do you know how to write line breaks using your method ?

[bhanuj]

My mistake.It has worked! I forgot deleting wrong code that i had before.

I put the entire code so that other developers can use it.

try {

//Create the XML Document structure
Document doc = new Document();
doc.setEncoding("ISO-8859-1");

XmlSerializer serializer = new KXmlSerializer();

Element principal = doc.createElement("","ListaRepartos");
listaRepartos.setAttribute(null,"id","1");
doc.addChild(Node.ELEMENT, principal);

//Create the output file which will be located in path
OutputStreamWriter writer=null;
FileConnection fc=null;
try{
String path="file:///C:/Data/Images/";
fc = (FileConnection) Connector.open(path+"oleola.xml", Connector.READ_WRITE);
if (!fc.exists())
fc.create();
OutputStream os = fc.openOutputStream();
writer = new OutputStreamWriter(os);
serializer.setOutput(writer);
doc.write(serializer);
}
finally {
writer.close();
fc.close();
}

}
catch (Exception exception) {
exception.printStackTrace();

}

Thanks guys!!

Thanks a lot..it is helping me