JAVA Class Library JSR 173 Stream API FOR XML Reference The technical principles of the implementation of the implementation framework
JSR 173 Stream API FOR XML Reference Technical Principles of the Implementation Framework
JSR 173 (Java Specification Request 173) is a standard interface used to process XML documents in the Java class library.The JSR 173 stream API for XML reference framework is a implementation of this standard.This article will introduce the technical principles of this framework.
The main goal of the JSR 173 stream API for XML reference framework is to provide an efficient, flexible and easy -to -use framework for processing, writing and operation of the read, writing and operation of XML documents.It can easily analyze and generate XML documents through a standardized API.
The core of this framework is XMLSTREAMREADER and XMLSTREAMWRITER interface.The XMLSTREAMREADER interface provides a streaming way to analyze the XML document, so that developers can read XML content one by one and access and process these data according to the labeled hierarchical structure.XMLSTREAMWRITER interface allows developers to generate XML documents in a streaming manner, and can write XML marks and corresponding contents one by one.
The technical principles of this framework can be divided into the following aspects:
1. parser (Parser): This framework uses event -based parsers.The parser scan the content of the XML document and trigger the corresponding event when encountering a specific XML mark.XmlstreamReader provides specific methods to access and process XML data based on the event type.
Below is a simple example of using XMLSTREAMREADER to analyze XML documents:
XMLInputFactory factory = XMLInputFactory.newInstance();
XMLStreamReader reader = factory.createXMLStreamReader(new FileInputStream("example.xml"));
while (reader.hasNext()) {
int event = reader.next();
if (event == XMLStreamConstants.START_ELEMENT) {
System.out.println("Start Element: " + reader.getLocalName());
} else if (event == XMLStreamConstants.CHARACTERS) {
System.out.println("Character Data: " + reader.getText());
} else if (event == XMLStreamConstants.END_ELEMENT) {
System.out.println("End Element: " + reader.getLocalName());
}
}
reader.close();
2. encoder: XMLSTREAMWRITER interface allows developers to generate XML documents in a streamlined manner.Developers can use the method provided by the interface to write the XML mark and corresponding content.The encoder encodes these data into XML format and outputs it to the specified target.
Below is a simple example of generating XML documents using XMLSTREAMWRITER:
XMLOutputFactory factory = XMLOutputFactory.newInstance();
XMLStreamWriter writer = factory.createXMLStreamWriter(new FileOutputStream("example.xml"));
writer.writeStartDocument();
writer.writeStartElement("root");
writer.writeStartElement("child");
writer.writeCharacters("Hello World!");
writer.writeEndElement();
writer.writeEndElement();
writer.writeEndDocument();
writer.close();
3. Factory: In order to create XMLSTREAMREADER and XMLSTREAMWRITER objects, the framework uses XMLINPUTFACTORY and XMLOUTPUTFACTORY factory.These factories provide a standardized way to create parser and encoder, as well as configuration of their behavior and attributes.
Summarize:
The reference framework of the JSR 173 stream API for XML is a implementation of the standard interface used to process XML documents in the Java class library.It provides an efficient, flexible and easy -to -use method to analyze and generate XML documents through XMLSTREAMREADER and XMLSTREAMWRITER interfaces.The technical principles of this framework include event -based parsing, encoder and factory.Developers can use this framework to process and operate XML data.
It is hoped that this article will help understand the technical principles of the JSR 173 stream API for XML reference to the implementation of the implementation framework.
