Interpret the original JSR 173 stream API for XML reference framework technology in the Java class library

JSR 173 Stream API FOR XML Reference Technology Original Technology -Interpretation and Example introduction: The JSR 173 stream API For XML reference implementation framework in the JAVA class library is a technology used to process XML data.This article will interpret the technical principles of the framework and provide some Java code examples to help readers better understand. 1. What is JSR 173 stream API for XML reference framework? JSR 173 defines a set of Java API for processing XML data.The JSR 173 framework is divided into two main parts: xmlReader and xmleventwriter.The XMLREADER class is used to read the data of XML documents, while the Xmleventwriter class is used to write XML data. 2. Examples of the XMLREADER class The XmlReader class provides many methods to analyze and read the contents of XML documents.Below is a simple example, showing how to use the XMLREADER class to read the elements and attributes in the XML document. 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 XMLReaderExample { public static void main(String[] args) { try { // Create a XMLINPUTFACTORY object XMLInputFactory inputFactory = XMLInputFactory.newInstance(); // Create a XMLSTREAMREADER object XMLStreamReader reader = inputFactory.createXMLStreamReader(new FileInputStream("example.xml")); // Read the contents of the XML document while (reader.hasNext()) { int event = reader.next(); // Treatment of different types of events switch (event) { case XMLStreamReader.START_ELEMENT: System.out.println("Start Element: " + reader.getLocalName()); // Get the attribute for (int i = 0; i < reader.getAttributeCount(); i++) { System.out.println("Attribute: " + reader.getAttributeLocalName(i) + " = " + reader.getAttributeValue(i)); } break; case XMLStreamReader.END_ELEMENT: System.out.println("End Element: " + reader.getLocalName()); break; case XMLStreamReader.CHARACTERS: // Treat the text node if (reader.getText().trim().length() > 0) { System.out.println("Text: " + reader.getText()); } break; } } // Close XMLSTREAMREADER object reader.close(); } catch (XMLStreamException | FileNotFoundException e) { e.printStackTrace(); } } } In the above example, we use the XML document named "Example.xml" with XMLSTREAMREADER objects.By using the XMLREADER class method, such as next () and getlocalName (), we can obtain different elements and attributes in XML documents and processed as needed. 3. Example of the use of XMLEVENTWRITER class The Xmleventwriter class is used to write XML data into the output stream or file.Below is a simple example, showing how to use the XmleventWriter class to generate a simple XML document. import javax.xml.stream.XMLEventFactory; import javax.xml.stream.XMLEventWriter; import javax.xml.stream.XMLOutputFactory; import javax.xml.stream.XMLStreamException; import javax.xml.stream.events.*; import java.io.FileOutputStream; import java.io.OutputStream; public class XMLEventWriterExample { public static void main(String[] args) { try { // Create a XMLOUTPUTFACTORY object XMLOutputFactory outputFactory = XMLOutputFactory.newInstance(); // Create a XMLEVENTWRITER object OutputStream outputStream = new FileOutputStream("output.xml"); XMLEventWriter writer = outputFactory.createXMLEventWriter(outputStream); // Create a XMLEVENTFACTORY object XMLEventFactory eventFactory = XMLEventFactory.newInstance(); // Create the start label of the XML document StartDocument startDocument = eventFactory.createStartDocument(); writer.add(startDocument); writer.add(eventFactory.createStartElement("", "", "root")); // Create a attribute Attribute attribute = eventFactory.createAttribute("attribute", "value"); // Create an element StartElement element = eventFactory.createStartElement("", "", "element", attribute.iterator(), null); writer.add(element); // Create a text node Characters text = eventFactory.createCharacters("This is a text node"); writer.add(text); // Create the end of the element EndElement endElement = eventFactory.createEndElement("", "", "element"); writer.add(endElement); // Create the end of the XML document writer.add(eventFactory.createEndElement("", "", "root")); writer.add(eventFactory.createEndDocument()); // Close Xmleventwriter object writer.close(); } catch (XMLStreamException e) { e.printStackTrace(); } catch (FileNotFoundException e) { e.printStackTrace(); } } } In the above example, we use the XMLEVENTWRITER object to write XML data into a file named "Output.xml".By using the method of XMLEVENTFACTORY class, such as CreateStartelement () and CreateCharas (), we can generate various parts of the XML document, and use the ADD () method of xmleventwriter to add them to XML.Finally, we close the Xmleventwriter object to complete the generation of XML documents. in conclusion: This article interprets the reference framework of the JSR 173 stream API for XML in the JAVA library.Through the use of examples of XMLreader and XMLEVENTWRITER class, readers can better understand and use this framework to process XML data.It is hoped that this article can provide readers with detailed information about the technical principles and instances of the JSR 173 framework.