Post Code, XML learning 3

XML file

03. xml

<?xml version="1.0" encoding="gb2312"?><!DOCTYPE persons[    <!ELEMENT persons (person*)>    <!ELEMENT person (name,sex,age)>    <!ELEMENT name (#PCDATA)>    <!ELEMENT sex (#PCDATA)>    <!ELEMENT age (#PCDATA)>]><persons>    <person>        <name>xiaowang</name>        <sex>male</sex>        <age>27</age>    </person></persons>

Java file 1: MyHandler. java

Import org. xml. sax. helpers. defaultHandler; import org. xml. sax. SAXParseException; import org. xml. sax. SAXException; public class MyHandler extends DefaultHandler {String em = null; // general error. Generally, the validity error is public void error (SAXParseException e) throws SAXException {em = e. getMessage (); System. out. println ("general error" + em);} // critical error public void fataError (SAXParseException e) throws SAXException {em = e. getMessage (); System. out. println ("Fatal error" + em );}}

Java file 2: XMLValidate. java

Import org. w3c. dom. document; import javax. xml. parsers. *; import java. util. imports; import java. io. file; public class XMLValidate {public static void main (String [] args) {// Save the name of the XML file String File = null; try {reader = new partition (System. in); System. out. println ("input file to be checked:"); file = reader. nextLine (); // obtain the resolution factory DocumentBuilderFactory factory = DocumentBuilderFactory. newInstance (); // set the parser to support the validity check factory. setValidating (true); // create the DOM parser DocumentBuilder builder = factory. newDocumentBuilder (); // instantiate the event processor MyHandler handler = new MyHandler (); // bind the event processor builder. setErrorHandler (handler); // starts parsing the file Document document = builder. parse (new File (file); // if the returned error message is null, XML is a valid if (handler. em = null) {System. out. println ("file" + file + "is a valid XML file. ");} else {System. out. println ("file" + file + "is invalid XML file") ;}} catch (Exception e) {e. printStackTrace ();}}}

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