Exploring the JSR 173 stream API for XML in the Java class library reference to the original technology of the implementation framework
JSR 173 is a standard API of Java, which is used to process XML documents.It contains a reference implementation framework for operating XML streams.This framework uses Java's streaming mode, allowing developers to read and write XML documents efficiently.
The reference implementation framework in JSR 173 is mainly composed of the following core interfaces:
1. XMLSTREAMREADER: This interface is used to read the XML document from the XML stream.Developers can read and analyze the elements of XML documents with this interface in line by line, which is very efficient when processing large XML documents.
Below is a simple sample code using XMLSTREAMREADER to read XML documents:
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
public class XMLStreamReaderExample {
public static void main(String[] args) {
try {
XMLInputFactory factory = XMLInputFactory.newInstance();
XMLStreamReader reader = factory.createXMLStreamReader(new FileInputStream("example.xml"));
// Read the XML document on a row
while (reader.hasNext()) {
int event = reader.next();
// Treatment according to the type of event
switch (event) {
case XMLStreamReader.START_ELEMENT:
System.out.println("Start Element: " + reader.getLocalName());
break;
case XMLStreamReader.END_ELEMENT:
System.out.println("End Element: " + reader.getLocalName());
break;
case XMLStreamReader.CHARACTERS:
System.out.println("Text: " + reader.getText());
break;
}
}
reader.close();
} catch (FileNotFoundException | XMLStreamException e) {
e.printStackTrace();
}
}
}
2. XMLSTREAMWRITER: The interface is used to write XML data into the XML stream.Developers can use this interface to create XML documents, write elements and attributes.
Below is a simple sample code written to write XML documents using XMLSTREAMWRITER:
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import java.io.FileOutputStream;
import java.io.IOException;
public class XMLStreamWriterExample {
public static void main(String[] args) {
try {
XMLOutputFactory factory = XMLOutputFactory.newInstance();
XMLStreamWriter writer = factory.createXMLStreamWriter(new FileOutputStream("example.xml"));
// Create XML documents
writer.writeStartDocument();
// Write into elements and attributes
writer.writeStartElement("book");
writer.writeAttribute("id", "1");
writer.writeCharacters("Java Programming");
writer.writeEndElement();
// End XML document
writer.writeEndDocument();
writer.flush();
writer.close();
} catch (IOException | XMLStreamException e) {
e.printStackTrace();
}
}
}
Using the JSR 173 stream API, developers can flexibly process XML documents, read and write data efficiently, making the processing of XML simple and convenient.
