Writing Dom tree from JAXP
Once I build a DOM tree, how can I write the xml to a string or a file using
the JAXP API. Given any particular Parser implementation, I have been able
to find methods that allow me to write the xml. However, from the java api
(JAXP), there doesn't seem to be a mechanism for doing this. Please
advise...
regards,
todd
Hi Todd,
You can't write XML out using JAXP 1.0 -- that feature is not included in
the API.
But you can use the XML serialization package that is included in the
built-in parser and the bundled Apache Xerces parser. Check out the
weblogic.apache.xml.serialize, org.apache.xml.serialize packages. The
javadocs are at
http://www.weblogic.com/docs60/xerces/org/apache/xml/serialize/package-summa
ry.html
Cheers,
-Todd
"Todd Singleton" <[email protected]> wrote in message
news:3a2d5bdb$[email protected]..
Once I build a DOM tree, how can I write the xml to a string or a fileusing
the JAXP API. Given any particular Parser implementation, I have beenable
to find methods that allow me to write the xml. However, from the javaapi
(JAXP), there doesn't seem to be a mechanism for doing this. Please
advise...
regards,
todd
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Hi,
I have created a DOM tree from scratch and would like to unparse the DOM tree and write the XML to a file, but how do I do that?
Does anybody got code examples that do this?
All help are very appreciated!
/DanielThank you very much for the hint! Unfortunaly I still got problem to get it work though.
I made a little piece of test code to try it but during the execution of the "Transformer.transform(source,result)" method I gets an "org.w3c.dom.DOMException".
Does anybody see what that problem might be cause of by exmining the code below?
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Here is my little piece of test code:
try{
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i used this code to create a new document:
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try {
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TransformerFactory transformerFactory =
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Hi,
I'm trying to generate an XML file from a DOM tree that I obtained from another XML file with the Xerces library. I used the following operation :
public static void writeXmlFile(Document doc, String filename) {
try {
Source source = new DOMSource(doc);
File file = new File(filename);
Result result = new StreamResult(file);
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Thanks for your answer,
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Hello,
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<?xml version="1.0" encoding="UTF-8"?>
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<ProductLine Number="1">
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How to modify a node value in a DOM tree?
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// ==================================
DOMParser theParser = new DOMParser();
theParser.setValidationMode(false);
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on idle
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if application "Safari" is not running then
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return
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another example:
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Note a double space between single digits (1 2 3 4) and a single space between double digits (10 12 14 16) is required for a match as per the table format:
Any full line:
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Hello,
I build a DOM tree in my applet.
Then I transform it to XML String.
But since the JRE 1.4.2_05 it doesn't work.
These lines failed because these variables became final:
org.apache.xalan.serialize.CharInfo.XML_ENTITIES_RESOURCE = getClass().getResource("XMLEntities.res").toString();
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DocumentBuilder builder = domFactory.newDocumentBuilder();
Document domXML = builder.newDocument();
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Thanks...
java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.apache.xalan.serialize.SerializerFactory.getSerializer(Unknown Source)
at org.apache.xalan.transformer.TransformerIdentityImpl.createResultContentHandler(Unknown Source)
at org.apache.xalan.transformer.TransformerIdentityImpl.transform(Unknown Source)
at matrix.CreateMtrx.SaveDoc(CreateMtrx.java:434)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at thinlet.Thinlet.invokeImpl(Unknown Source)
at thinlet.Thinlet.invoke(Unknown Source)
at thinlet.Thinlet.handleMouseEvent(Unknown Source)
at thinlet.Thinlet.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.RuntimeException: The resource [ XMLEntities.res ] could not load: java.net.MalformedURLException: no protocol: XMLEntities.res
XMLEntities.res java.net.MalformedURLException: no protocol: XMLEntities.res
at org.apache.xalan.serialize.CharInfo.<init>(Unknown Source)
at org.apache.xalan.serialize.SerializerToXML.<clinit>(Unknown Source)
... 28 more -
Schema validation error when validating dom tree in memory
Hello folks,
I have the following problem:
I construct a xml-file via the DOM API and before writing to file, I want to validate the DOM tree against a existing schema file.
But I always receive following error:
In line 0 of buffer:
LSX-00006: No default namespace for "conf_file"
Validation failed, error 6
Here's what the xml file looks like:
<conf_file xmlns="http://www.sun.com/gridware/configuration_file_format" >
<conf_version>0</conf_version>
<conf_entry>
<param>test</param>
<value>0</value>
</conf_entry>
</conf_file>
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Do you know what I doing wrong ?
Thanks ...
HartiIt is a bug.
-
XML Parser for Java v2. Applying XSLT to DOM tree
I encountered pretty weird behavior of XML Parser for Java v2.
While applying XSLT to XML document created in memory using DOM
interface I couldn't access element attributes. For example,
given the XML document:
<root>
<Item ID="00001">Value of Item 00001</Item>
<Item ID="00002">Value of Item 00002</Item>
</root>
and XSLT:
<xsl:template match="/">
<HTML>
<HEAD>
<TITLE>XSLT Test</TITLE>
</HEAD>
<BODY>
<xsl:for-each select="/Error">
<H1>Error</H1><xsl:value-of select="."/>
</xsl:for-each>
<TABLE border="0" cellspacing="0" cellpadding="2">
<TBODY>
<xsl:for-each select="/root">
<TR>
<TH style="background-color:khaki">
<xsl:text>Attribute</xsl:text>
</TH>
<TH style="background-color:khaki">
<xsl:text>Value</xsl:text>
</TH>
</TR>
<xsl:for-each select="Item">
<TR>
<TD><xsl:value-of select="@ID"/></TD>
<TD><xsl:value-of select="."/></TD>
</TR>
</xsl:for-each>
</xsl:for-each>
</TBODY>
</TABLE>
</BODY>
</HTML>
</xsl:template>
If I build DOM tree by parsing XML file the resulting HTML
document after applying XSLT will display
Attribute Value
00001 Value of Item 00001
00002 Value of Item 00002
But if I build DOM tree using following code:
XMLDocument xDoc = new XMLDocument();
Element root = xDoc.createElement( "root" );
xDoc.appendChild( root );
Element elem = xDoc.createElement( "Item" );
elem.setAttribute( "ID", "00001" );
root.appendChild( elem ).
appendChild( xDoc.createTextNode( "Value of Item 00001" ) );
elem = xDoc.createElement( "Item" );
elem.setAttribute( "ID", "00002" );
root.appendChild( elem )
.appendChild( xDoc.createTextNode( "Value of Item 00002" ) );
the same XSLT will produce the following HTML output:
Attribute Value
Value of Item 00001
Value of Item 00002
So the value for the ID attribute is not displayed. At the same
time I can access this attribute using DOM interface. For
example, following code
NodeList nList = xDoc.getElementsByTagName( "Item" );
Element e;
for( int i = 0; i < nList.getLength(); i++ )
e = (Element)nList.item( i );
System.out.println( "ID: " + e.getAttribute( "ID" ) );
produces an output
ID: 00001
ID: 00002
Here is the code for applying XSLT to DOM tree:
DOMParser parser = new DOMParser();
parser.parse( new FileInputStream( "test.xsl" ) );
XMLDocument xsldoc = parser.getDocument();
XSLStylesheet xsl = new XSLStylesheet( xsldoc, createURL( "" ) );
XMLDocument out = new XMLDocument();
out.appendChild( new XSLProcessor().processXSL(xsl, xDoc) );
out.print( new FileOutputStream( "test.html" ) );
Andrei Filimonov
nullWe are not getting what you're getting on Solaris. See the
following:
Script started on Tue Jun 22 18:53:56 1999
Processing /view/test/vobs/oracore3/.ndeprodrc.csh
Processing /private/.nderc.csh
[test] > cat bruno.xml
<my_grandpa age="88">
<my_dad age="66">
<me age="44">
<my_son age="22">
</my_son>
</me>
</my_dad>
</my_grandpa>
[test] > cat bruno.xsl
<?xml version="1.0"?>
<!-- Identity transformation -->
<xsl:stylesheet xmlns:xsl="http://www.w3.org/XSL/Transform/1.0">
<xsl:template match="me">
<xsl:value-of select="my_son/@age"/>
<xsl:value-of select="@age"/>
<xsl:value-of select="../@age"/>
<xsl:value-of select="../../@age"/>
</xsl:template>
</xsl:stylesheet>
[test] > java XSLSample bruno.xsl bruno.xml
<root>
22446688
</root>
[test] > exit
script done on Tue Jun 22 18:54:22 1999
What platform are you on and does your stylesheet and xml doc
match ours?
Oracle XML Team
http://technet.oracle.com
Oracle Technology Network
Bruno Bontempi (guest) wrote:
: I had a similar problem in accessing element attributes from
an
: XSLT sheet.
: It seems like the processor correctly accesses element
attributes
: in the context node, but does not retrieve values of
attributes
: outside the context node.
: For example, for an XML document like:
: <my_grandpa age="88">
: <my_dad age="66">
: <me age="44">
: <my_son age="22">
: </my_son>
: </me>
: </my_dad>
: </my_grandpa>
: and an XSL stylesheet like:
: <xsl:template match="me">
: <xsl:value-of select="my_son/@age"/>
: <xsl:value-of select="@age"/>
: <xsl:value-of select="../@age"/>
: <xsl:value-of select="../../@age"/>
: </xsl:template>
: I expect an output like:
: 22446688
: but all I get is
: 44
: I am also using Jim Clark's XT, which is returning the
expected
: result.
: Thanks in advance for your help,
: Bruno.
: Andrei Filimonov (guest) wrote:
: : I encountered pretty weird behavior of XML Parser for Java
v2.
: : While applying XSLT to XML document created in memory using
DOM
: : interface I couldn't access element attributes. For example,
: : given the XML document:
: : <root>
: : <Item ID="00001">Value of Item 00001</Item>
: : <Item ID="00002">Value of Item 00002</Item>
: : </root>
: : and XSLT:
: : <xsl:template match="/">
: : <HTML>
: : <HEAD>
: : <TITLE>XSLT Test</TITLE>
: : </HEAD>
: : <BODY>
: : <xsl:for-each select="/Error">
: : <H1>Error</H1><xsl:value-of select="."/>
: : </xsl:for-each>
: : <TABLE border="0" cellspacing="0" cellpadding="2">
: : <TBODY>
: : <xsl:for-each select="/root">
: : <TR>
: : <TH style="background-color:khaki">
: : <xsl:text>Attribute</xsl:text>
: : </TH>
: : <TH style="background-color:khaki">
: : <xsl:text>Value</xsl:text>
: : </TH>
: : </TR>
: : <xsl:for-each select="Item">
: : <TR>
: : <TD><xsl:value-of select="@ID"/></TD>
: : <TD><xsl:value-of select="."/></TD>
: : </TR>
: : </xsl:for-each>
: : </xsl:for-each>
: : </TBODY>
: : </TABLE>
: : </BODY>
: : </HTML>
: : </xsl:template>
: : If I build DOM tree by parsing XML file the resulting HTML
: : document after applying XSLT will display
: : Attribute Value
: : 00001 Value of Item 00001
: : 00002 Value of Item 00002
: : But if I build DOM tree using following code:
: : XMLDocument xDoc = new XMLDocument();
: : Element root = xDoc.createElement( "root" );
: : xDoc.appendChild( root );
: : Element elem = xDoc.createElement( "Item" );
: : elem.setAttribute( "ID", "00001" );
: : root.appendChild( elem ).
: : appendChild( xDoc.createTextNode( "Value of Item
00001" )
: : elem = xDoc.createElement( "Item" );
: : elem.setAttribute( "ID", "00002" );
: : root.appendChild( elem )
: : .appendChild( xDoc.createTextNode( "Value of Item
00002" )
: : the same XSLT will produce the following HTML output:
: : Attribute Value
: : Value of Item 00001
: : Value of Item 00002
: : So the value for the ID attribute is not displayed. At the
same
: : time I can access this attribute using DOM interface. For
: : example, following code
: : NodeList nList = xDoc.getElementsByTagName( "Item" );
: : Element e;
: : for( int i = 0; i < nList.getLength(); i++ )
: : e = (Element)nList.item( i );
: : System.out.println( "ID: " + e.getAttribute( "ID" ) );
: : produces an output
: : ID: 00001
: : ID: 00002
: : Here is the code for applying XSLT to DOM tree:
: : DOMParser parser = new DOMParser();
: : parser.parse( new FileInputStream( "test.xsl" ) );
: : XMLDocument xsldoc = parser.getDocument();
: : XSLStylesheet xsl = new XSLStylesheet( xsldoc, createURL
: : XMLDocument out = new XMLDocument();
: : out.appendChild( new XSLProcessor().processXSL(xsl, xDoc) );
: : out.print( new FileOutputStream( "test.html" ) );
: : Andrei Filimonov
null -
Serialization of DOM Tree+calling POST method in servlet
Hi all,
I am trying to serialize a DOM tree and send it from an applet to a servlet..I am having difficulty in calling the post method of the servlet..can anyone please tell me how the POST method in the servlet is called from the applet...I am using the code as seen on the forum for calling the POST method as below:
URL url = new URL("http://localhost:8080/3awebapp/updateservlet");
HttpURLConnection con = (HttpURLConnection)url.openConnection();
con.setUseCaches(false);
con.setRequestProperty("Content-Type","application/octet-stream");
System.out.println("Connected");
con.setDoOutput(true);
con.setRequestMethod("POST");
System.out.println("do output called");
con.setDoInput(true);
System.out.println("do Input called");
ObjectOutputStream objout = new ObjectOutputStream(con.getOutputStream());
yet the post method in the servlet does not seem to be called....
another problem I had was trying to serialize a DOM document and send it to the servlet. I am using the following code to write the DOM document on an output stream..would this work:
OutputFormat format = new OutputFormat(document);
XMLSerializer serializer = new XMLSerializer( objout, format );
System.out.println("XML Serializer Started");
DOMSerializer newSerializer=serializer.asDOMSerializer();
newSerializer.serialize( document );
objout.flush();
objout.close();
...since the doPost method of the servlet is not being called I do not whether the above code would be sent to the servlet..
Any advice on the above two matters would be highly appreciated..
Fenilperhaps my piece of code may help You - relevant parts marked //<--,
but I have a problem when reading my object - which is a serialized DomTree :
Variant 1 : sending XML-data as string will arrive as should be, but parser says org.xml.sax.SAXParseException (missing root-element)
Variant 2 : readObject says java.io.OptionalDataException, but the DomTree will be parsed and displayed
-- snipp --
import java.io.InputStream;
import org.w3c.dom.Document;
import java.net.*;
import com.oreilly.servlet.HttpMessage; //<--
import java.util.*;
import java.io.ObjectInputStream;
myApplet :
try {
URL url = new URL(getCodeBase(),"../../xml/FetchDocument");
HttpMessage msg = new HttpMessage(url);
Properties props = new Properties();
props.put("InputFeldName","FeldWert");
InputStream in = msg.sendGetMessage(props);
//<-- alt : sendPostMessage
ObjectInputStream result = new ObjectInputStream(in);
try {
Object obj = result.readObject();
myServlet :
public void doGet(HttpServletRequest req,HttpServletResponse res)
throws ServletException, IOException {
TreeCreator currentTree = new TreeCreator();
ObjectOutputStream out = new ObjectOutputStream(res.getOutputStream());
-- variant 1 :
out.writeObject(currentTree.skillOutputString());
out.flush();
out.close();
-- variant 2 :
OutputFormat( TreeCreator.cdi ); //Serialize DOM
OutputFormat format = new OutputFormat( currentTree.getCDI() ); format.setEncoding("ISO-8859-1");
XMLSerializer serial = new XMLSerializer( out, format );
serial.asDOMSerializer(); // As a DOM Serializer
serial.serialize( currentTree.getCDI().getDocumentElement() );
serial.endDocument();
out.flush();
out.close(); -
Error when I replaced the DOM parcer with JAXP
I replaced the DOM parcer with JAXP ....
We moved from DOM parcer �import org.apache.xerces.parsers.DOMParser;� to JAXP.
Here is my code:
// Step 1: create a DocumentBuilderFactory and setNamespaceAware
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
// Step 2: create a DocumentBuilder
DocumentBuilder db = dbf.newDocumentBuilder();
// Step 3: parse the input file to get a Document object
Document doc = db.parse(location);
root = doc.getDocumentElement();
root.normalize();
AND when we run stress test after a while we start getting error
java.lang.NullPointerException
at org.apache.xerces.dom.DeepNodeListImpl.nextMatchingElementAfter(Unknown Source)
at org.apache.xerces.dom.DeepNodeListImpl.item(Unknown Source)
at org.apache.xerces.dom.DeepNodeListImpl.getLength(Unknown Source)
at com.xxx.yyy.WfStartTasksXmlDAO.getActionPerformed(Unknown Source)
at com.xxx.yyy.WfStartTasksXmlDAO.getAction(Unknown Source)
- Any idea why we are getting this error. Is this server (Linux) problem? or JAXP?
Message was edited by:
TamerBashaThis is happening because JAXP is not thread safe. need to synchronize bracket or use thread safe parser.
-
How i can store a DOM Tree to XML file
I want to insert a xml documet into another another xml document and then store it.
for this i have parsed a xml document using com.sun.xml.parser and got its domtree in document doc1 by builder.getDocument(). After that i parsed another xml document and got it's domtree in document doc2 by builder.getDocument().
now i created a Document type doc . I create dom tree in doc that contains all the nodes of doc1 and insert the doc2 at a position . If i m printing this doc i got the required document. Now i want to store this doc into a xml file. so i paas thid doc and filename in which i want to store it into a function
public static void writeXmlToFile(String filename, Document document)
try
// Prepare the DOM document for writing
Source source = new DOMSource(document);
// Prepare the output file
File file = new File(filename);
Result result = new StreamResult(file);
// Write the DOM document to the file
// Get Transformer
Transformer xformer = TransformerFactory.newInstance().newTransformer();
// Write to a file
xformer.transform(source, result);
catch (TransformerConfigurationException e)
System.out.println("TransformerConfigurationException: " + e);
catch (TransformerException e)
System.out.println("TransformerException: " + e);
but i m getting following error
Exception in thread "main" java.lang.AbstractMethodError: com.sun.xml.tree.ElementNode.getNamespacesURI()Ljava/lang/String;
at com.sun.apache.xalan.internal.xsltc.trax.DOM2TO.parse(Unknown Source)
at com.sun.apache.xalan.internal.xsltc.trax.DOM2TO.parse(Unknown Source)
at com.sun.apache.xalan.internal.xsltc.trax.DOM2TO.parse(Unknown Source)
at com.sun.apache.xalan.internal.xsltc.trax.TranformerImpl.transformIdentity(Unknown Source)
at com.sun.apache.xalan.internal.xsltc.trax.TranformerImpl.transformIdentity(Unknown Source)
at com.sun.apache.xalan.internal.xsltc.trax.TranformerImpl.transformIdentity(Unknown Source)thanks for the reply
i m able to do my job using
import javax.xml.parsers.*;
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder1 = factory.newDocumentBuilder();
doc = builder1.parse(uri);
when i want to covert this doc into an xml file by passing this doc in the function below then it is ok..
public static void writeXmlToFile(String filename, Document document)
try
// Prepare the DOM document for writing
Source source = new DOMSource(document);
// Prepare the output file
File file = new File(filename);
Result result = new StreamResult(file);
// Write the DOM document to the file
// Get Transformer
Transformer xformer = TransformerFactory.newInstance().newTransformer();
// Write to a file
xformer.transform(source, result);
catch (TransformerConfigurationException e)
System.out.println("TransformerConfigurationException: " + e);
catch (TransformerException e)
System.out.println("TransformerException: " + e);
but i want to use com.sun.xml.parser like
import com.sun.xml.parser.*;
import com.sun.xml.tree.XmlDocumentBuilder;
XmlDocumentBuilder builder = new XmlDocumentBuilder();
Parser parser = new com.sun.xml.parser.Parser();
parser.setDocumentHandler(builder);
builder.setParser(parser);
builder.setDisableNamespaces(false);
parser.parse(uri);
doc = builder.getDocument();
when i m trying to store this doc into an xml file by passing this doc into funtion writeXmlToFile( filename, doc) then the errors occur (that i hav told in the first post)
plz help..
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