Unable to write back the content of XML

[Tyagi Ashish]

Hello I am trying to break-up big xml into small, I am using StAX, but I am not able to write back the content to the new file. Program is creating empty file

Please find my code

import java.io.File;
import java.io.FileReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stax.StAXSource;
import javax.xml.transform.stream.StreamResult;

public class Demo {

public static void main(String[] args) throws Exception {
XMLInputFactory xif = XMLInputFactory.newInstance();
XMLStreamReader xsr = xif.createXMLStreamReader(new FileReader("input.xml"));
xsr.nextTag(); // Advance to statements element

TransformerFactory tf = TransformerFactory.newInstance();
Transformer t = tf.newTransformer();
while(xsr.nextTag() == XMLStreamConstants.START_ELEMENT) {
File file = new File("out/" + xsr.getAttributeValue(null, "account") + ".xml");
t.setOutputProperty(OutputKeys.INDENT, "yes");
t.transform(new StAXSource(xsr), new StreamResult(file));

}
}

}





the input file contain

<statements>
<statement account="123">
</statement>
<statement account="456">
</statement>
</statements>



Please help me as soon as possible

[Paul Clapham]

Your input is not well-formed XML. I'm surprised you aren't getting exceptions thrown. Or perhaps you are but are ignoring them?

[Tyagi Ashish]

Could you please help me How can I achieve that, thanks

[Paul Clapham]

How can you achieve what? Making that XML well-formed? Not ignoring exceptions? Your question is not clear.

[Tyagi Ashish]

I am new with this thing but I have to implement this. I have tried with following XML as well but that is not working

<?xml version="1.0" encoding="UTF-8"?>
<statements>
<statement account="123">
Ashish
</statement>
<statement account="456">
Mohan
</statement>
</statements>


Could you please correct my code and provide the sample well-formed XML so that I can run and test that. I would really appreciate your help brother

[Tyagi Ashish]

Infact my original requirement said split the xml file into N small files where you provide N at run time, please let me know if you have code for that. You can use any of the sample XML you want. Thank you so much

[g tsuji]

Your original code in post #1 should work for that specific xml. Your real code may not, can't say.

[Tyagi Ashish]

I am honestly saying, the code is running without exception and it is creating file as well but those files are empty and I am not sure how to fix that. Could you guys check if I have to add some more line in the code or I would have to import any jar file

[g tsuji]

I am honestly saying, your original code in post #1 is working for that specific xml and it is creating the corresponding files with the requisite content.

[Tyagi Ashish]

ok so here I have modified the code for debug prospective and got the following exception

Code:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stax.StAXSource;
import javax.xml.transform.stream.StreamResult;

public class Demo {

    public static void main(String[] args) throws FileNotFoundException, XMLStreamException, TransformerConfigurationException   {
    	int i=0;
        XMLInputFactory xif = XMLInputFactory.newInstance();
        XMLStreamReader xsr = xif.createXMLStreamReader(new FileReader("input.xml"));
        xsr.nextTag(); // Advance to statements element

        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer t = tf.newTransformer();
        while(xsr.nextTag() == XMLStreamConstants.START_ELEMENT) {
        	File file = new File("out/" +( i++) + ".xml");
            t.setOutputProperty(OutputKeys.INDENT, "yes");
            System.out.println("The Source is "+xsr.getLocalName()+" and the content is "+xsr.getElementText());
//            System.out.println("The Content is "+xsr.getElementText());
            try {
				t.transform(new StAXSource(xsr), new StreamResult(file));
			} catch (TransformerException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}  
        }
    }

}

Content of Input.xml:
<?xml version="1.0" encoding="iso-8859-1"?>
<import>
<dkoffer>Ashish</dkoffer>
<dkoffer>mohan</dkoffer>
<dkoffer>raj</dkoffer>
</import>

Exception:
The Source is dkoffer and the content is Ashish
Exception in thread "main" java.lang.IllegalStateException: XMLStreamReader must be in the START_DOCUMENT or START_ELEMENT state.
at javax.xml.transform.stax.StAXSource.<init>(Unknown Source)
at Demo.main(Demo.java:32)


Can you explain why it is not fetching the content of rest of the two element. Thanks !!!

[g tsuji]

You choose to use StAX cursor api, you cannot move the cursor all the time and it cannot move back neither, that's its characteristic for efficiency which happens to be not coincide with yours.

[1] For splitting output

import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileReader; 
import javax.xml.stream.XMLInputFactory; 
import javax.xml.stream.XMLStreamConstants; 
import javax.xml.stream.XMLStreamException; 
import javax.xml.stream.XMLStreamReader; 
import javax.xml.transform.OutputKeys; 
import javax.xml.transform.Transformer; 
import javax.xml.transform.TransformerConfigurationException; 
import javax.xml.transform.TransformerException; 
import javax.xml.transform.TransformerFactory; 
import javax.xml.transform.stax.StAXSource; 
import javax.xml.transform.stream.StreamResult; 

public class Demo { 

public static void main(String[] args) throws FileNotFoundException, XMLStreamException, TransformerConfigurationException { 
int i=0; 
XMLInputFactory xif = XMLInputFactory.newInstance(); 
XMLStreamReader xsr = xif.createXMLStreamReader(new FileReader("input.xml")); 
xsr.nextTag(); // Advance to statements element 

TransformerFactory tf = TransformerFactory.newInstance(); 
Transformer t = tf.newTransformer(); 
t.setOutputProperty(OutputKeys.INDENT, "yes");   //moved up
while(xsr.nextTag() == XMLStreamConstants.START_ELEMENT) { 
File file = new File("out/" +( i++) + ".xml"); 
//t.setOutputProperty(OutputKeys.INDENT, "yes"); //moved up for better clarity
//you cannot move the cursor all the time
//System.out.println("The Source is "+xsr.getLocalName()+" and the content is "+xsr.getElementText()); 
// System.out.println("The Content is "+xsr.getElementText()); 
try { 
t.transform(new StAXSource(xsr), new StreamResult(file)); 
} catch (TransformerException e) { 
// TODO Auto-generated catch block 
e.printStackTrace(); 
} 
}
}

}

[2] If you want inspecting element text, don't rely on the output code lines.

import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileReader; 
import javax.xml.stream.XMLInputFactory; 
import javax.xml.stream.XMLStreamConstants; 
import javax.xml.stream.XMLStreamException; 
import javax.xml.stream.XMLStreamReader; 
import javax.xml.transform.OutputKeys; 
import javax.xml.transform.Transformer; 
import javax.xml.transform.TransformerConfigurationException; 
import javax.xml.transform.TransformerException; 
import javax.xml.transform.TransformerFactory; 
import javax.xml.transform.stax.StAXSource; 
import javax.xml.transform.stream.StreamResult; 

public class Demo { 

public static void main(String[] args) throws FileNotFoundException, XMLStreamException, TransformerConfigurationException { 
//int i=0; 
XMLInputFactory xif = XMLInputFactory.newInstance(); 
XMLStreamReader xsr = xif.createXMLStreamReader(new FileReader("input.xml")); 
xsr.nextTag(); // Advance to statements element 

TransformerFactory tf = TransformerFactory.newInstance(); 
Transformer t = tf.newTransformer(); 
t.setOutputProperty(OutputKeys.INDENT, "yes");   //moved up
while(xsr.nextTag() == XMLStreamConstants.START_ELEMENT) { 
//File file = new File("out/" +( i++) + ".xml"); 
//t.setOutputProperty(OutputKeys.INDENT, "yes"); //moved up for better clarity
//you cannot move the cursor all the time even for element's text
String s=xsr.getElementText();    //you move the cursor once and stop
System.out.println("The Source is "+xsr.getLocalName()+" and the content is "+s); 
System.out.println("The Content is "+s); 
//and then you don't do this because the cursor is no longer at START_ELEMENT
/*
try { 
t.transform(new StAXSource(xsr), new StreamResult(file)); 
} catch (TransformerException e) { 
// TODO Auto-generated catch block 
e.printStackTrace(); 
} 
*/
}
}

}

[Tyagi Ashish]

Do I need to import any special jar for execution of [1] splitting the output (for ex. xalan.jar, jaxp-api.jar).

Now I am having following exception after adding (xalan.jar)
javax.xml.transform.TransformerException: Can't transform a Source of type javax.xml.transform.stax.StAXSource
at org.apache.xalan.transformer.TransformerIdentityImpl.transform(Unknown Source)
at Demo2.main(Demo2.java:32)
Exception in thread "main" javax.xml.stream.XMLStreamException: A non-whitespace event found while calling nextTag.
at com.ibm.xml.xlxp.api.stax.msg.StAXMessageProvider.throwXMLStreamException(StAXMessageProvider.java:59)
at com.ibm.xml.xlxp.api.stax.XMLStreamReaderImpl.nextTag(XMLStreamReaderImpl.java:667)
at com.ibm.xml.xlxp.api.stax.XMLInputFactoryImpl$XMLStreamReaderProxy.nextTag(XMLInputFactoryImpl.java:197)
at Demo2.main(Demo2.java:28)

[g tsuji]

If you're running jdk1.6, StAX should be included in its runtime jar, hence, no need to add anything special to the empty classpath to run. If it is below 1.6, you may need a separate download of stax: stax-1.2.0.jar for the latest RI, and included it in the classpath. But I would then be surprised on what basis you said in post #1 to have run the code without error?!