JavaEE_SAX

最新推荐文章于 2021-02-27 19:56:19 发布

IparhanGeek

最新推荐文章于 2021-02-27 19:56:19 发布

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本文介绍了SAX解析器的基本概念及其在Java环境中的使用方法。详细讲解了SAX解析器的主要接口，包括ContentHandler、DTDHandler、EntityResolver、ErrorHandler及DefaultHandler，并提供了示例代码展示如何创建和配置XMLReader。

There are knowledge about SAX with parser JavaEE.

1.SAX (Simple API for Xml) Its a greate parser about JavaEE and XML.

2. SupInterface : org.xml.sax

!1. ContentHandler : this is etends SAX packge

              void startDocument()
              void endDocument()
              void startElement(String uri, String localName, String qName, Attributes atts)
              void endElement(String uri, String localName, String qName)
              void characters(char&#91; &#93; ch, int start, int length)

   !2.DTDHandler:      this is in SAX packge too , about all DTD in xml

             void startDocumevoid notationDecl(String name, String publicId, String systemId) nt()
             void unparsedEntityDecl(String name, String publicId, String systemId, String notationName)

!3.EntityResolver: body serach of xml

             public InputSource resolveEntity(String publicId, String systemId)

!4.ErrorHandler : hander exception when happend problem.

          void error(SAXParseException exception)
          void fatalError(SAXParseException exception)
          void warning(SAXParseException exception)

!5. DefaultHandler : its implements other four interface , so i support this interface to use in project.

         import org.xml.sax.*;
         import org.xml.sax.helpers.DefaultHandler;
         public class TestDefaultHandler extends DefaultHandler{
         public void startDocument() throws SAXException{
         System.out.println(""); }
         public void endDocument() throws SAXException{
         System.out.println("解析完成！"); }
         public void startElement(String uri, String localName, String qName,
         Attributes atts) throws SAXException {
         System.out.println("："+qName);
         }
         public void endElement(String uri, String localName, String qName)
         throws SAXException{
         System.out.println("对"+qName+"的");
      }
}

!6.XMLReader : its the must be interface in SAX2 in xml java.

<span style="font-size:14px;">        import org.xml.sax.*;
        import org.xml.sax.helpers.*;
        public class TestXMLReader{
        public TestXMLReader(){
          try{
        XMLReader reader = XMLReaderFactory.createXMLReader(
        "org.apache.xerces.parsers.SAXParser");
          System.out.println("Success");
       //MyContentHandler implements ContentHandleri interface 的类
       reader.setContentHandler(new MyContentHandler());
       reader.setDTDHandler(new MyDTDHandler());
       //对test.xml
          reader.parse("test.xml");
           System.out.println("");
       }catch(SAXException e){e.printStackTrace();}</span>
   }
}

NOTE :
1. create XMLReader from default system
XMLReader reader = XMLReaderFactory.createXMLReader();

2.create XMl Reader

XMLReader reader = XMLReaderFactory.createXMLReader(

"org.apache.xerces.parsers.SAXParser");

3.create SAX Parser

SAXParserFactory spFactory = SAXParserFactory.newInstance();

SAXParser sParser = spFactory.newSAXParser();

Iparhan_Java 2016-6-23 GoodLuck!