Output XML data to console with SAX parser in Java
Description
The following code shows how to output XML data to console with SAX parser.
Example
import java.io.StringReader;
// ww w . j a v a 2s . c om
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.XMLReader;
public class Main {
public static void main(String[] argv) throws Exception {
SAXParserFactory spf = SAXParserFactory.newInstance();
XMLReader reader = null;
SAXParser parser = spf.newSAXParser();
reader = parser.getXMLReader();
reader.setContentHandler(new MyContentHandler());
StringReader sr = new StringReader("<tag></tag>");
//InputSource is = new InputSource("xmlFileName.xml");
InputSource is = new InputSource(sr);
reader.parse(is);
}
}
class MyContentHandler implements ContentHandler {
private Locator locator;
/**
* The name and of the SAX document and the current location within the
* document.
*/
public void setDocumentLocator(Locator locator) {
this.locator = locator;
System.out.println("-" + locator.getLineNumber() + "---Document ID: "
+ locator.getSystemId());
}
/** The parsing of a document has started.. */
public void startDocument() {
System.out.println("-" + locator.getLineNumber()
+ "---Document parse started");
}
/** The parsing of a document has completed.. */
public void endDocument() {
System.out.println("-" + locator.getLineNumber()
+ "---Document parse ended");
}
/** The start of a namespace scope */
public void startPrefixMapping(String prefix, String uri) {
System.out.println("-" + locator.getLineNumber()
+ "---Namespace scope begins");
System.out.println(" " + prefix + "=\"" + uri + "\"");
}
/** The end of a namespace scope */
public void endPrefixMapping(String prefix) {
System.out.println("-" + locator.getLineNumber()
+ "---Namespace scope ends");
System.out.println(" " + prefix);
}
/** The opening tag of an element. */
public void startElement(String namespaceURI, String localName,
String qName, Attributes atts) {
System.out.println("-" + locator.getLineNumber()
+ "---Opening tag of an element");
System.out.println(" Namespace: " + namespaceURI);
System.out.println(" Local name: " + localName);
System.out.println(" Qualified name: " + qName);
for (int i = 0; i < atts.getLength(); i++) {
System.out.println(" Attribute: " + atts.getQName(i) + "=\""
+ atts.getValue(i) + "\"");
}
}
/** The closing tag of an element. */
public void endElement(String namespaceURI, String localName, String qName) {
System.out.println("-" + locator.getLineNumber()
+ "---Closing tag of an element");
System.out.println(" Namespace: " + namespaceURI);
System.out.println(" Local name: " + localName);
System.out.println(" Qualified name: " + qName);
}
/** Character data. */
public void characters(char[] ch, int start, int length) {
System.out.println("-" + locator.getLineNumber() + "---Character data");
showCharacters(ch, start, length);
}
/** Ignorable whitespace character data. */
public void ignorableWhitespace(char[] ch, int start, int length) {
System.out.println("-" + locator.getLineNumber() + "---Whitespace");
showCharacters(ch, start, length);
}
/** Processing Instruction */
public void processingInstruction(String target, String data) {
System.out.println("-" + locator.getLineNumber()
+ "---Processing Instruction");
System.out.println(" Target: " + target);
System.out.println(" Data: " + data);
}
/** A skipped entity. */
public void skippedEntity(String name) {
System.out.println("-" + locator.getLineNumber() + "---Skipped Entity");
System.out.println(" Name: " + name);
}
/**
* Internal method to format arrays of characters so the special whitespace
* characters will show.
*/
public void showCharacters(char[] ch, int start, int length) {
System.out.print(" \"");
for (int i = start; i < start + length; i++)
switch (ch[i]) {
case '\n':
System.out.print("\\n");
break;
case '\r':
System.out.print("\\r");
break;
case '\t':
System.out.print("\\t");
break;
default:
System.out.print(ch[i]);
break;
}
System.out.println("\"");
}
}
The code above generates the following result.