I got "java.lang.NullPointerException" when I try to parse an XML and the XML is not complete.
Here the code
import java.io.File;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class Read {
public static void main(String[] args) {
String tableName = "myTable";
String query = ("select * FROM " + tableName);
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
java.sql.Connection conn = DriverManager
.getConnection("jdbc:sqlserver://localhost:1433;databaseName=myDatabase;user=myUser;password=myPassword");
Statement state = conn.createStatement();
ResultSet result = state.executeQuery(query);
ResultSetMetaData resultMeta = result.getMetaData();
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
int cpt=1;
String [][]d ;
d = new String [1000][1000];
d[0][0]= new String("test");
d[0][1]=new String ("test");
while(result.next()){
for(int i = 1; i <= resultMeta.getColumnCount(); i++)
{
if( result.getString(i)== null)
{ d[cpt][i]= new String(" ");}
else
{ String res =result.getString(i);
d[cpt][i]= new String (res);
}
}
cpt=cpt+1;
}
//Element Table Name
Document doc = docBuilder.newDocument();
Element p_tableName = doc.createElement(tableName);
doc.appendChild(p_tableName);
for(int j=1;j<= 15;j++)
{
Element p_object = doc.createElement("Object");
p_tableName.appendChild(p_object);
for(int i=1;i <= resultMeta.getColumnCount() ;i++)
{
Element nomChamps = doc.createElement(resultMeta.getColumnName(i));
nomChamps.appendChild(doc.createTextNode(d[j][i]));
p_object.appendChild(nomChamps);
}
}
Transformer tf = TransformerFactory.newInstance().newTransformer();
//Format XML
tf.setOutputProperty(OutputKeys.INDENT, "yes");
tf.setOutputProperty(OutputKeys.METHOD, "xml");
tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
tf.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
DOMSource source = new DOMSource(doc);
StreamResult res = new StreamResult(new File("D:\\test/file2.xml"));
**//I've got a problem whit this next line;**
**tf.transform(source, res);**
System.out.println("ACTION COMPLETE !!");
result.close();
state.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
With "tf.transform(source, res)" the xml is created but not finished and I've got an error, but if I delete this line the error leave and my XML is not created.
Thx for helping
You can use an error listener to manage this, something like this:
tf.setErrorListener(new ErrorListener() {
#Override
public void warning(TransformerException exception) throws TransformerException {
exception.printStackTrace();
}
#Override
public void error(TransformerException exception) throws TransformerException {
exception.printStackTrace();
}
#Override
public void fatalError(TransformerException exception) throws TransformerException {
exception.printStackTrace();
}
} );
Related
I am converting CSV file to XML , it is converting but not getting desired structured output .
My java Code :-
public static void main(String[] args){
List<String> headers=new ArrayList<String>(5);
File file=new File("C:/Users/Admin/Desktop/data.csv");
BufferedReader reader=null;
try {
DocumentBuilderFactory domFactory =DocumentBuilderFactory.newInstance();
DocumentBuilder domBuilder=domFactory.newDocumentBuilder();
Document newDoc=domBuilder.newDocument();
// Root element
Element rootElement=newDoc.createElement("root");
newDoc.appendChild(rootElement);
reader = new BufferedReader(new FileReader(file));
int line=0;
String text=null;
while ((text=reader.readLine())!=null) {
StringTokenizer st=new StringTokenizer(text, "?", false);
String[] rowValues=new String[st.countTokens()];
int index=0;
while (st.hasMoreTokens()) {
String next=st.nextToken();
rowValues[index++]=next;
}
//String[] rowValues = text.split(",");
if (line == 0) { // Header row
for (String col:rowValues) {
headers.add(col);
Element rowElement=newDoc.createElement("header");
rootElement.appendChild(rowElement);
for (int col1=0;col1<headers.size();col1++) {
String header = headers.get(col1);
String value = null;
if (col1<rowValues.length) {
value=rowValues[col1];
} else {
// ?? Default value
value=" ";
}
rowElement.setTextContent(value);
System.out.println(headers+" "+value);
}
}} else { // Data row
Element rowElement=newDoc.createElement("row");
rootElement.appendChild(rowElement);
for (int col=0;col<headers.size();col++) {
String header = headers.get(col);
String value = null;
if (col<rowValues.length) {
value=rowValues[col];
} else {
// ?? Default value
value=" ";
}
rowElement.setTextContent(value);
System.out.println(header+" "+value);
}
}
line++;
}
try {
TransformerFactory tranFactory = TransformerFactory.newInstance();
Transformer aTransformer = tranFactory.newTransformer();
aTransformer.setOutputProperty(OutputKeys.INDENT, "yes");
aTransformer.setOutputProperty(OutputKeys.METHOD, "xml");
aTransformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
Source src = new DOMSource(newDoc);
Result result = new StreamResult(new File("C:/Users/Admin/Desktop/data.xml"));
aTransformer.transform(src, result);
System.out.println("File creation successfully!");
} catch (Exception exp) {
exp.printStackTrace();
} finally {
try {
} catch (Exception e1) {
}
try {
} catch (Exception e1) {
}
}
} catch (Exception e1) {
e1.printStackTrace();
}
}
This is my CSV file:-
Symbol,Open,High,Low,Last Traded Price,Change
"NIFTY 50","9,645.90","9,650.65","9,600.95","9,609.30","-5.70"
"RELIANCE","1,390.00","1,414.20","1,389.00","1,407.55","26.50"
"BPCL","647.70","665.00","645.95","660.10","10.75"
"ADANIPORTS","368.50","373.80","368.00","372.25","4.25"
"ONGC","159.50","161.75","159.35","160.80","1.70"
And this is the output I am getting:-
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<root>
<header>Symbol,Open,High,Low,Last Traded Price,Change</header>
<row>"NIFTY 50","9,645.90","9,650.65","9,600.95","9,609.30","-5.70"</row>
<row>"RELIANCE","1,390.00","1,414.20","1,389.00","1,407.55","26.50"</row>
<row>"BPCL","647.70","665.00","645.95","660.10","10.75"</row>
<row>"ADANIPORTS","368.50","373.80","368.00","372.25","4.25"</row>
<row>"ONGC","159.50","161.75","159.35","160.80","1.70"</row>
</root>
Suggest me where am I going wrong ? I tried according to me , but getting confuse where in header and row section should I make changes.
ADDED :-
Expected output
<root>
<header>symbol</header>
<row>NIFTY 50</row>
<row>RELIANCE</row>
<row>BPCL></row>
.
.
<header>Open</header>
<row>9,645.90</row>
<row>1,390.00</row>
.
.
</root>
For your reference:
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVParser;
import org.apache.commons.csv.CSVRecord;
import org.apache.commons.csv.QuoteMode;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class CsvToXml {
public static void main(String[] args) {
File inputFile = new File("C:/Users/Admin/Desktop/data.csv");
CSVParser inParser = null;
Document newDoc = null;
try {
inParser = CSVParser.parse(inputFile, StandardCharsets.UTF_8,
CSVFormat.EXCEL.withHeader().withQuoteMode(QuoteMode.NON_NUMERIC));
DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder domBuilder = domFactory.newDocumentBuilder();
newDoc = domBuilder.newDocument();
// Root element
Element rootElement = newDoc.createElement("root");
newDoc.appendChild(rootElement);
List<CSVRecord> records = inParser.getRecords();
for (String key : inParser.getHeaderMap().keySet()) {
Element rowElement = newDoc.createElement("header");
rootElement.appendChild(rowElement);
rowElement.setTextContent(key);
for (CSVRecord record : records) {
rowElement = newDoc.createElement("row");
rootElement.appendChild(rowElement);
rowElement.setTextContent(record.get(key));
}
}
TransformerFactory tranFactory = TransformerFactory.newInstance();
Transformer aTransformer = tranFactory.newTransformer();
aTransformer.setOutputProperty(OutputKeys.INDENT, "yes");
aTransformer.setOutputProperty(OutputKeys.METHOD, "xml");
aTransformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
Source src = new DOMSource(newDoc);
Result result = new StreamResult(new File("C:/Users/Admin/Desktop/data.xml"));
aTransformer.transform(src, result);
System.out.println("File creation successfully!");
} catch (Exception e) {
e.printStackTrace();
} finally {
if (inParser != null) {
try {
inParser.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
This is using Apache Commons CSV.
I have the following source XML file named customers.xml:
<?xml version="1.0" encoding="utf-8"?>
<p:CustomerElement xmlns:p="http://www.dog.com/customer" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:schemaLocation="http://www.dog.com/customer Customer.xsd">
<Customer>
<Sender>
<transmitDate>2016-02-21T00:00:00</transmitDate>
<transmitter>Dog ETL v2.0</transmitter>
<dealerCode><![CDATA[P020]]></dealerCode>
<DMSSystem><![CDATA[DBS]]></DMSSystem>
<DMSReleaseNumber><![CDATA[5.0]]></DMSReleaseNumber>
</Sender>
<Identifier>
<updateInd><![CDATA[A]]></updateInd>
<dealerCustNumber><![CDATA[AMADOR]]></dealerCustNumber>
<dealerCustName><![CDATA[AMADOR COMPUTERS]]></dealerCustName>
<phoneNumber><![CDATA[800 111 4444]]></phoneNumber>
<faxNumber><![CDATA[780 111 4444]]></faxNumber>
<email xsi:nil="true" />
<customerType><![CDATA[R]]></customerType>
<activeCustomerInd>false</activeCustomerInd>
<parentCustomerNumber xsi:nil="true" />
<primaryStoreNumber><![CDATA[00]]></primaryStoreNumber>
<preferredLanguage><![CDATA[ENG]]></preferredLanguage>
<dealerDateInSystem>2000-01-11T00:00:00</dealerDateInSystem>
<dealerLastUpdatedDate>2015-02-05T00:00:00</dealerLastUpdatedDate>
</Identifier>
<Location>
<address2><![CDATA[ACCOUNT FLAGGED FOR DELETION]]></address2>
<address3><![CDATA[AS PER BILL FEB AA/15]]></address3>
<city><![CDATA[CHICAGO]]></city>
<postalCode><![CDATA[Q5S 1E5]]></postalCode>
<state><![CDATA[AB]]></state>
<country><![CDATA[CA]]></country>
<location><![CDATA[FLAGGED FOR DELETION]]></location>
<addressType><![CDATA[M]]></addressType>
</Location>
<Division>
<divisionCode><![CDATA[G]]></divisionCode>
<divisionName><![CDATA[CAR]]></divisionName>
<IndustryCode>
<industryCode><![CDATA[AQ99]]></industryCode>
<primaryIndustryCodeInd>true</primaryIndustryCodeInd>
</IndustryCode>
<SalesRep>
<number><![CDATA[XXX]]></number>
<name><![CDATA[KILL ACCOUNT IN PROCESS]]></name>
<type><![CDATA[M]]></type>
<par>0</par>
<email xsi:nil="true" />
<phoneNumber><![CDATA[000 000 0000]]></phoneNumber>
</SalesRep>
</Division>
</Customer>
<Customer>
<Sender>
<transmitDate>2016-02-21T00:00:00</transmitDate>
<transmitter>Dog ETL v2.0</transmitter>
<dealerCode><![CDATA[P000]]></dealerCode>
<DMSSystem><![CDATA[DBS]]></DMSSystem>
<DMSReleaseNumber><![CDATA[5.0]]></DMSReleaseNumber>
</Sender>
<Identifier>
<updateInd><![CDATA[A]]></updateInd>
<dealerCustNumber><![CDATA[UU20888]]></dealerCustNumber>
<dealerCustName><![CDATA[ ADVERTISING AND PR]]></dealerCustName>
<phoneNumber xsi:nil="true" />
<faxNumber xsi:nil="true" />
<email xsi:nil="true" />
<customerType><![CDATA[I]]></customerType>
<activeCustomerInd>true</activeCustomerInd>
<parentCustomerNumber xsi:nil="true" />
<primaryStoreNumber><![CDATA[M2]]></primaryStoreNumber>
<preferredLanguage><![CDATA[ENG]]></preferredLanguage>
<dealerDateInSystem>2015-11-18T00:00:00</dealerDateInSystem>
<dealerLastUpdatedDate>2015-11-19T00:00:00</dealerLastUpdatedDate>
</Identifier>
<Location>
<address2><![CDATA[EQUIP]]></address2>
<city><![CDATA[ADER]]></city>
<country><![CDATA[CA]]></country>
<addressType><![CDATA[M]]></addressType>
</Location>
<Division>
<divisionCode><![CDATA[A]]></divisionCode>
<divisionName><![CDATA[AGRO]]></divisionName>
<IndustryCode>
<industryCode><![CDATA[EQ00]]></industryCode>
<primaryIndustryCodeInd>true</primaryIndustryCodeInd>
</IndustryCode>
</Division>
</Customer>
</p:CustomerElement>
I have the following java code, which parses customers.xml into individual "Customer" entities, and then attempts to convert each of them into an AVRO format:
package com.dogsoft.data.xmltoavro;
import java.io.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import jdk.nashorn.internal.runtime.regexp.joni.constants.NodeType;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import org.apache.avro.Protocol;
import org.apache.avro.Schema;
import org.apache.avro.file.DataFileReader;
import org.apache.avro.file.DataFileWriter;
import org.apache.avro.generic.GenericArray;
import org.apache.avro.generic.GenericData;
import org.apache.avro.generic.GenericDatumReader;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.io.DatumReader;
import org.apache.avro.io.DatumWriter;
import org.apache.avro.specific.SpecificDatumWriter;
import org.apache.avro.util.Utf8;
import org.w3c.dom.*;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Pattern;
public class ParseXmlFile {
private static Protocol protocol;
public static void xmlToAvro(File xmlFile, File avroFile) throws IOException, SAXException {
try {
InputStream stream = new FileInputStream("/tmp/xml.avsc");
if (stream == null) throw new IllegalStateException("Classpath should include xml.avsc");
protocol = Protocol.parse(stream);
} catch (IOException e) {
throw new RuntimeException(e);
}
Schema schema = protocol.getType("Element");
Document doc = parse(xmlFile);
DatumWriter<GenericRecord> datumWriter = new SpecificDatumWriter<>(schema);
try (DataFileWriter<GenericRecord> fileWriter = new DataFileWriter<>(datumWriter)) {
fileWriter.create(schema, avroFile);
Object docElement = doc.getDocumentElement();
fileWriter.append(wrapElement(doc.getDocumentElement()));
}
}
private static GenericData.Record wrapElement(Element el) {
GenericData.Record record = new GenericData.Record(protocol.getType("Element"));
record.put("name", el.getNodeName());
NamedNodeMap attributeNodes = el.getAttributes();
List<GenericData.Record> attrRecords = new ArrayList<>();
for (int i = 0; i < attributeNodes.getLength(); i++) {
Attr attr = (Attr) attributeNodes.item(i);
attrRecords.add(wrapAttr(attr));
}
record.put("attributes", attrRecords);
List<Object> childArray = new ArrayList<>();
NodeList childNodes = el.getChildNodes();
for (int i = 0; i < childNodes.getLength(); i++) {
Node node = childNodes.item(i);
Object nt = node.getNodeType();
if (node.getNodeType() == Node.ELEMENT_NODE)
childArray.add(wrapElement((Element) node));
if (node.getNodeType() == Node.TEXT_NODE)
childArray.add(node.getTextContent());
}
record.put("children", childArray);
return record;
}
private static GenericData.Record wrapAttr(Attr attr) {
GenericData.Record record = new GenericData.Record(protocol.getType("Attribute"));
record.put("name", attr.getName());
record.put("value", attr.getValue());
return record;
}
private static Document parse(File file) throws IOException, SAXException {
try {
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
return builder.parse(file);
} catch (ParserConfigurationException e) {
throw new RuntimeException(e);
}
}
public static void avroToXml(File avroFile, File xmlFile) throws IOException {
try {
InputStream stream = new FileInputStream("/tmp/xml.avsc");
if (stream == null) throw new IllegalStateException("Classpath should include xml.avsc");
protocol = Protocol.parse(stream);
} catch (IOException e) {
throw new RuntimeException(e);
}
DatumReader<GenericRecord> datumReader = new GenericDatumReader<>(protocol.getType("Element"));
DataFileReader<GenericRecord> dataFileReader = new DataFileReader<>(avroFile, datumReader);
GenericRecord record = dataFileReader.next();
Document doc;
try {
doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
} catch (ParserConfigurationException e) {
throw new RuntimeException(e);
}
Element el = unwrapElement(record, doc);
doc.appendChild(el);
saveDocument(doc, xmlFile);
}
private static Element unwrapElement(GenericRecord record, Document doc) {
String name = "" + record.get("name");
Element el = doc.createElement(name);
#SuppressWarnings("unchecked")
GenericArray<GenericRecord> attrArray = (GenericArray<GenericRecord>) record.get("attributes");
for (GenericRecord attrRecord : attrArray)
el.setAttributeNode(unwrapAttr(attrRecord, doc));
#SuppressWarnings("unchecked")
GenericArray<Object> childArray = (GenericArray<Object>) record.get("children");
for (Object childObj : childArray) {
if (childObj instanceof GenericRecord)
el.appendChild(unwrapElement((GenericRecord) childObj, doc));
if (childObj instanceof Utf8)
el.appendChild(doc.createTextNode("" + childObj));
}
return el;
}
private static Attr unwrapAttr(GenericRecord record, Document doc) {
Attr attr = doc.createAttribute("" + record.get("name"));
attr.setValue("" + record.get("value"));
return attr;
}
private static void saveDocument(Document doc, File file) {
try {
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.transform(new DOMSource(doc), new StreamResult(file));
} catch (TransformerException e) {
throw new RuntimeException(e);
}
}
public static void main(String[] args)
{
Object nodeObject = null;
Node myNode = null;
Transformer transformer = null;
try
{
try {
transformer =
TransformerFactory.newInstance().newTransformer();
} catch (TransformerConfigurationException e) {
e.printStackTrace();
}
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse("/tmp/customers.xml");
System.out.printf("Version = %s%n", doc.getXmlVersion());
System.out.printf("Encoding = %s%n", doc.getXmlEncoding());
System.out.printf("Standalone = %b%n%n", doc.getXmlStandalone());
if (doc.hasChildNodes())
{
int customerNumber = 0;
NodeList nl = doc.getDocumentElement().getChildNodes();
for (int i = 0; i < nl.getLength(); i++) {
Node node = nl.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
System.out.println(node.toString());
customerNumber++;
File avroFile = new File("/tmp/customer" + customerNumber + ".avro");
File xmlFile = new File("/tmp/customer" + customerNumber + ".xml");
File xmlFile1 = new File("/tmp/customer" + customerNumber + "-foo.xml");
try {
transformer.transform(
new DOMSource(node), new StreamResult(xmlFile));
File outputFile = new File("/tmp/customer" + customerNumber + ".avro");
xmlToAvro(xmlFile, outputFile);
} catch (TransformerException e) {
e.printStackTrace();
}
}
}
}
}
catch (IOException ioe)
{
System.err.println("IOE: " + ioe);
}
catch (SAXException saxe)
{
System.err.println("SAXE: " + saxe);
}
catch (FactoryConfigurationError fce)
{
System.err.println("FCE: " + fce);
}
catch (ParserConfigurationException pce)
{
System.err.println("PCE: " + pce);
}
}
}
This code works overall, but it ignores any content, which is enclosed into
![CDATA[
tag. As it happens, most of the actual useful data in the customers.xml files is enclosed into these tags.
Is there a way to modify this code, to make it not ignore the CDATA contents?
Instead of hand-writing parser code, you might want to split the problem in two parts: first, bind XML into POJO (using JAXB or Jackson XML module); and then write POJO as Avro (using Apache Avro lib, or Jackson Avro module). All you need for that would be POJO definition that matches expected structure for data as XML and Avro. Result should be less code, and basically specifying what needs to happen and now how to do it.
This is my first post on Stack, so if there is something wrong, be patient ...
Ok, my question is how can I write an XML attribute with value. The result would be something like this:
<GroupAttribute>
<Attribute name = "Color"> Pink </Attribute>
.....
</GroupAttribute>
I tried this:
Element attribute = doc.createElement ("attribute");
groupAttribute.appendChild (attribute);
attribute.setAttribute ("attributeType" p.attributeColor);
groupAttribute.appendChild (getCompanyElements (doc, attribute, "attribute", p.attributeColor));
But it does not work.. the result is:
<GroupAttribute>
<Attribute> Pink </Attribute>
.....
</GroupAttribute>
the setAttribute is missing ...
What am I doing wrong?
Here the code:
import com.opencsv.*;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
*
* #author Mike
*/
public class prueba {
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
List<Producto> prods = new ArrayList<Producto>();
try {
CSVReader reader;
reader = new CSVReader(new FileReader("C:\\Temp\\feeds\\Product_Prueba.csv"), ';');
String[] nextLine;
try {
while ((nextLine = reader.readNext()) != null) {
// nextLine[] is an array of values from the line
//System.out.println(Arrays.toString(nextLine));
//Lee
Producto p;
p = new Producto();
p.attributeColor = "Pink";
prods.add(p);
}
} catch (IOException ex) {
Logger.getLogger(prueba.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (FileNotFoundException ex) {
Logger.getLogger(prueba.class.getName()).log(Level.SEVERE, null, ex);
}
xeraXML(prods);
}
static void xeraXML(List<Producto> ps) {
DocumentBuilderFactory icFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder icBuilder;
try {
icBuilder = icFactory.newDocumentBuilder();
Document doc = icBuilder.newDocument();
Element mainRootElement = doc.createElement("productRequest");
doc.appendChild(mainRootElement);
for (Iterator<Producto> i = ps.iterator(); i.hasNext();) {
Producto p;
p = i.next();
mainRootElement.appendChild(getProductElement(doc, p));
}
// output DOM XML to console
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
DOMSource source = new DOMSource(doc);
StreamResult console = new StreamResult(System.out);
//StreamResult out = new StreamResult("C:\\Temp\\results\\resultado.xml");
transformer.transform(source, console);
//transformer.transform(source, out);
} catch (Exception e) {
e.printStackTrace();
}
}
private static Element getProductElement(Document doc /*String localizedFor,*/, Producto p) {
Element groupAttribute = doc.createElement("groupAttribute");
Element attribute = doc.createElement("attribute");
groupAttribute.appendChild(attribute);
attribute.setAttribute("attributeType", p.attributeColor);
groupAttribute.appendChild(getElements(doc, attribute, "attribute", p.attributeColor));
return groupAttribute;
}
private static Node getElements(Document doc, Element element, String name, String value) {
Element node = doc.createElement(name);
node.appendChild(doc.createTextNode(value));
return node;
}
}
And here the Producto class:
public class Producto {
public String attributeColor;
}
I just wanted to add the comment but am writing it as an answer since I don't have that privilege yet. I was looking to add the attribute to the xml node and I came across this post.
dependency = dom.createElement("dependency");
dependency.setAttribute("type", "value");
dependencies.appendChild(dependency);
I added the child after setting the attribute.
From a Webserver request i get an XML Response,which contains my needed data.
it looks like (excerpt):
<ctc:BasePrice>
<cgc:PriceAmount amountCurrencyID="EUR">18.75</cbc:PriceAmount>
<cgc:BaseQuantity quantityUnitCode="EA">1</cbc:BaseQuantity>
</ctc:BasePrice>
<ctc:BasePrice>
<cgc:PriceAmount amountCurrencyID="EUR">18.25</cbc:PriceAmount>
<cgc:BaseQuantity quantityUnitCode="EA">1</cbc:BaseQuantity>
<cgc:MinimumQuantity quantityUnitCode="EA">3</cbc:MinimumQuantity>
<ctc:BasePrice>
What i need is the first "PriceAmount" value,which could be a different price then the second.
But how can i make sure to retrieve the correct one,by "telling" the parser he should take the element which does not contain the "MinimumQuantity" Field and distinguish them ?
I read a lot in Sax etc but could find an idea how to implement a "logic" for that.
Maybe someone ran into similar problem.Thanks in advance for every hint.
You could use xpath for this. The expression "//*[local-name()='MinimumQuantity']/../*[local-name()='PriceAmount']" should return what you want. eg
import java.io.ByteArrayInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class XpathParser {
public static void main(String[] args) {
try {
String xml = "<root>"
+ "<ctc:BasePrice>"
+ "<cgc:PriceAmount amountCurrencyID=\"EUR\">18.75</cgc:PriceAmount>"
+ "<cgc:BaseQuantity quantityUnitCode=\"EA\">1</cgc:BaseQuantity>"
+ "</ctc:BasePrice>"
+ "<ctc:BasePrice>"
+ "<cgc:PriceAmount amountCurrencyID=\"EUR\">18.25</cgc:PriceAmount>"
+ "<cgc:BaseQuantity quantityUnitCode=\"EA\">1</cgc:BaseQuantity>"
+ "<cgc:MinimumQuantity quantityUnitCode=\"EA\">3</cgc:MinimumQuantity>"
+ "</ctc:BasePrice>"
+ "</root>";
InputStream xmlStream = new ByteArrayInputStream(xml.getBytes());
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = builderFactory.newDocumentBuilder();
Document xmlDocument = builder.parse(xmlStream);
XPath xPath = XPathFactory.newInstance().newXPath();
String expression = "//*[local-name() = 'BasePrice' and not(descendant::*[local-name() = 'MinimumQuantity'])]/*[local-name()='PriceAmount']";
NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET);
for (int i = 0; i < nodeList.getLength(); i++) {
System.out.println(nodeList.item(i).getFirstChild().getNodeValue());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (XPathExpressionException e) {
e.printStackTrace();
}
}
}
Dom Parser way
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class DomParser{
public static void main(String[] args) {
try {
String xml = "<root>"
+ "<ctc:BasePrice>"
+ "<cgc:PriceAmount amountCurrencyID=\"EUR\">18.75</cgc:PriceAmount>"
+ "<cgc:BaseQuantity quantityUnitCode=\"EA\">1</cgc:BaseQuantity>"
+ "</ctc:BasePrice>"
+ "<ctc:BasePrice>"
+ "<cgc:PriceAmount amountCurrencyID=\"EUR\">18.25</cgc:PriceAmount>"
+ "<cgc:BaseQuantity quantityUnitCode=\"EA\">1</cgc:BaseQuantity>"
+ "<cgc:MinimumQuantity quantityUnitCode=\"EA\">3</cgc:MinimumQuantity>"
+ "</ctc:BasePrice>"
+ "</root>";
InputStream xmlStream = new ByteArrayInputStream(xml.getBytes());
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = builderFactory.newDocumentBuilder();
Document xmlDocument = builder.parse(xmlStream);
xmlDocument.getDocumentElement().normalize();
NodeList nList = xmlDocument.getElementsByTagName("ctc:BasePrice");
for (int temp = 0; temp < nList.getLength(); temp++) {
Node nNode = nList.item(temp);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
if(eElement.getElementsByTagName("cgc:MinimumQuantity").getLength() == 0){
System.out.println(eElement.getElementsByTagName("cgc:PriceAmount").item(0).getTextContent());
}
}
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
From the given XML String, i have to update End Date value .
Even though I'm updating the xml in updateNodeValue() method, my final output xml is same as the input xml.
Can someone tell me what is the mistake in this code
import java.io.StringReader;
import java.io.StringWriter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
public class MyClass{
static String strXml = "<INFO><BeginDate>2013-12-02</BeginDate><EndDate>2014-01-31</EndDate></INFO>";
public static void main(String[] args) throws Exception {
System.out.println(strXml);
Document doc = StringToDocument(strXml);
updateNodeValue(doc);
String newxml = DocumentToString(doc);
System.out.println(newxml);
}
public static void updateNodeValue(Document doc) {
Node rootNode = doc.getFirstChild();
NodeList list = rootNode.getChildNodes();
for (int i = 0; i < list.getLength(); i++) {
Element element = (Element) list.item(i);
Node node = list.item(i);
if ("EndDate".equals(node.getNodeName())) {
element.setNodeValue("2013-12-12");
return;
}
}
}
public static String DocumentToString(Document doc) throws Exception {
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
StringWriter writer = new StringWriter();
transformer.transform(new DOMSource(doc), new StreamResult(writer));
String output = writer.getBuffer().toString();
return output;
}
public static Document StringToDocument(String strXml) throws Exception {
Document doc = null;
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
StringReader strReader = new StringReader(strXml);
InputSource is = new InputSource(strReader);
doc = (Document) builder.parse(is);
} catch (Exception e) {
e.printStackTrace();
throw e;
}
return doc;
}
}
Useelement.setTextContent(...) in your updateNodeValue method.
The method you should use is not setNodeValue() but setTextContent()
See http://docs.oracle.com/javase/1.5.0/docs/api/org/w3c/dom/Node.html#setNodeValue(java.lang.String)