查询XML文档(Query XML Document)

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小牛编辑
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2023-12-01

例子 (Demo Example)

这是我们需要查询滚动号码的输入文本文件:393 -

<?xml version = "1.0"?>
<class>
   <student rollno = "393">
      <firstname>Dinkar</firstname>
      <lastname>Kad</lastname>
      <nickname>Dinkar</nickname>
      <marks>85</marks>
   </student>
   <student rollno = "493">
      <firstname>Vineet</firstname>
      <lastname>Gupta</lastname>
      <nickname>Vinni</nickname>
      <marks>95</marks>
   </student>
   <student rollno = "593">
      <firstname>Jasvir</firstname>
      <lastname>Singh</lastname>
      <nickname>Jazz</nickname>
      <marks>90</marks>
   </student>
</class>

UserHandler.java

package cn.xnip.xml;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class UserHandler extends DefaultHandler {
   boolean bFirstName = false;
   boolean bLastName = false;
   boolean bNickName = false;
   boolean bMarks = false;
   String rollNo = null;
   @Override
   public void startElement(String uri, 
      String localName, String qName, Attributes attributes) throws SAXException {
      if (qName.equalsIgnoreCase("student")) {
         rollNo = attributes.getValue("rollno");
      }
      if(("393").equals(rollNo) && qName.equalsIgnoreCase("student")){
         System.out.println("Start Element :" + qName);      
      }       
      if (qName.equalsIgnoreCase("firstname")) {
         bFirstName = true;
      } else if (qName.equalsIgnoreCase("lastname")) {
         bLastName = true;
      } else if (qName.equalsIgnoreCase("nickname")) {
         bNickName = true;
      } else if (qName.equalsIgnoreCase("marks")) {
         bMarks = true;
      }
   }
   @Override
   public void endElement(String uri, String localName, String qName) throws SAXException {
      if (qName.equalsIgnoreCase("student")) {
         if(("393").equals(rollNo) 
            && qName.equalsIgnoreCase("student"))
            System.out.println("End Element :" + qName);
      }
   }
   @Override
   public void characters(char ch[], int start, int length) throws SAXException {
      if (bFirstName && ("393").equals(rollNo)) {
         //age element, set Employee age
         System.out.println("First Name: " + new String(ch, start, length));
         bFirstName = false;
      } else if (bLastName && ("393").equals(rollNo)) {
         System.out.println("Last Name: " + new String(ch, start, length));
         bLastName = false;
      } else if (bNickName && ("393").equals(rollNo)) {
         System.out.println("Nick Name: " + new String(ch, start, length));
         bNickName = false;
      } else if (bMarks && ("393").equals(rollNo)) {
         System.out.println("Marks: " + new String(ch, start, length));
         bMarks = false;
      }
   }
}

SAXQueryDemo.java

package cn.xnip.xml;
import java.io.File;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class SAXQueryDemo {
   public static void main(String[] args){
      try {	
         File inputFile = new File("input.txt");
         SAXParserFactory factory = SAXParserFactory.newInstance();
         SAXParser saxParser = factory.newSAXParser();
         UserHandler userhandler = new UserHandler();
         saxParser.parse(inputFile, userhandler);     
      } catch (Exception e) {
         e.printStackTrace();
      }
   }   
}
class UserHandler extends DefaultHandler {
   boolean bFirstName = false;
   boolean bLastName = false;
   boolean bNickName = false;
   boolean bMarks = false;
   String rollNo = null;
   @Override
   public void startElement(String uri, 
      String localName, String qName, Attributes attributes) throws SAXException {
      if (qName.equalsIgnoreCase("student")) {
         rollNo = attributes.getValue("rollno");
      }
      if(("393").equals(rollNo) &&
         qName.equalsIgnoreCase("student")){
         System.out.println("Start Element :" + qName);      
      }       
      if (qName.equalsIgnoreCase("firstname")) {
         bFirstName = true;
      } else if (qName.equalsIgnoreCase("lastname")) {
         bLastName = true;
      } else if (qName.equalsIgnoreCase("nickname")) {
         bNickName = true;
      } else if (qName.equalsIgnoreCase("marks")) {
         bMarks = true;
      }
   }
   @Override
   public void endElement(String uri, 
      String localName, String qName) throws SAXException {
      if (qName.equalsIgnoreCase("student")) {
         if(("393").equals(rollNo) 
            && qName.equalsIgnoreCase("student"))
            System.out.println("End Element :" + qName);
      }
   }
   @Override
   public void characters(char ch[], int start, int length) throws SAXException {
      if (bFirstName && ("393").equals(rollNo)) {
         //age element, set Employee age
         System.out.println("First Name: " + new String(ch, start, length));
         bFirstName = false;
      } else if (bLastName && ("393").equals(rollNo)) {
         System.out.println("Last Name: " + new String(ch, start, length));
         bLastName = false;
      } else if (bNickName && ("393").equals(rollNo)) {
         System.out.println("Nick Name: " + new String(ch, start, length));
         bNickName = false;
      } else if (bMarks && ("393").equals(rollNo)) {
         System.out.println("Marks: " + new String(ch, start, length));
         bMarks = false;
      }
   }
}

上述程序将产生以下结果 -

Start Element :student
First Name: Dinkar
Last Name: Kad
Nick Name: Dinkar
Marks: 85
End Element :student