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Analysieren einer XML-Datei mit Java SAX
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Das ist das Bild von dem Projekt nach der Erledigung
department-data.xml
<?xml version="1.0"?>
<department>
<employee>
<empNo>E01</empNo>
<empName>KING</empName>
<hireDate>17-11-1981</hireDate>
<salary>100000</salary>
</employee>
<employee>
<empNo>E02</empNo>
<empName>JONES</empName>
<hireDate>02-04-1981</hireDate>
<salary>200000</salary>
</employee>
</department>
MySaxHandler.java
package org.o7planning.tutorial.sax;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class MySaxHandler extends DefaultHandler {
boolean foundEmpNo = false;
boolean foundEmpName = false;
boolean foundHireDate = false;
boolean foundSalary = false;
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
System.out.println("---------------------------");
System.out.println("Start Element :" + qName);
if (qName.equals("empNo")) {
foundEmpNo = true;
}
if (qName.equals("empName")) {
foundEmpName = true;
}
if (qName.equals("hireDate")) {
foundHireDate = true;
}
if (qName.equalsIgnoreCase("salary")) {
foundSalary = true;
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
System.out.println("End Element :" + qName);
}
@Override
public void characters(char ch[], int start, int length)
throws SAXException {
System.out.println("characters :");
if (foundEmpNo) {
System.out.println("Emp No : " + new String(ch, start, length));
foundEmpNo = false;
}
if (foundEmpName) {
System.out.println("Emp Name : " + new String(ch, start, length));
foundEmpName = false;
}
if (foundHireDate) {
System.out.println("Hire Date : " + new String(ch, start, length));
foundHireDate = false;
}
if (foundSalary) {
System.out.println("Salary : " + new String(ch, start, length));
foundSalary = false;
}
}
}
MainReadXML.java
package org.o7planning.tutorial.sax;
import java.io.File;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.helpers.DefaultHandler;
public class MainReadXML {
public static void main(String[] args) {
try {
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser saxParser = factory.newSAXParser();
DefaultHandler handler = new MySaxHandler();
File file = new File("department-data.xml");
saxParser.parse(file, handler);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Und das ist das Ergebnis von dem Starten der Klasse MainReadXML
---------------------------
Start Element :department
characters :
---------------------------
Start Element :employee
characters :
---------------------------
Start Element :empNo
characters :
Emp No : E01
End Element :empNo
characters :
---------------------------
Start Element :empName
characters :
Emp Name : KING
End Element :empName
characters :
---------------------------
Start Element :hireDate
characters :
Hire Date : 17-11-1981
End Element :hireDate
characters :
---------------------------
Start Element :salary
characters :
Salary : 100000
End Element :salary
characters :
End Element :employee
characters :
---------------------------
Start Element :employee
characters :
---------------------------
Start Element :empNo
characters :
Emp No : E02
End Element :empNo
characters :
---------------------------
Start Element :empName
characters :
Emp Name : JONES
End Element :empName
characters :
---------------------------
Start Element :hireDate
characters :
Hire Date : 02-04-1981
End Element :hireDate
characters :
---------------------------
Start Element :salary
characters :
Salary : 200000
End Element :salary
characters :
End Element :employee
characters :
End Element :department
Jetzt erklären wir die Arbeitsweise von SAX nach dem oben erwähnten Beispiel.
