小GUI程序，使用SAX解析XML并显示，guisax,import java.

小GUI程序，使用SAX解析XML并显示，guisax,import java.

import java.io.*;import java.awt.*;import java.awt.event.*;import org.xml.sax.*;import com.sun.xml.parser.*;import org.xml.sax.helpers.*;/** * XmlView1 - a small AWT GUI program that illustrates use * of the javasoft SAX implementation.  Note that this * little program cannot parse any XML file that specifies * a DTD, because SAX is very fussy about DTD URIs. * XmlView2 is more sophisticated, and can handle XML files * that have DTDs. */public class XmlView1 extends Frame implements ActionListener {    List contents;    Label caption;    TextField filename;    Button goButton;    /**     * Constructor - create the AWT GUI     */    public XmlView1() {   super("XmlView1");   contents = new List();   caption = new Label("XML file:");   filename = new TextField();   goButton = new Button("PARSE");   Panel topPanel = new Panel();   topPanel.setLayout(new BorderLayout(2,2));   topPanel.add("West",caption);   topPanel.add("Center",filename);   topPanel.add("East", goButton);   add("North", topPanel);   add("Center", contents);   setSize(400,500);   goButton.addActionListener(this);    }    /**     * This class is a SAX listener that accepts the parse     * events during parsing.     */    public class ListingHandler extends HandlerBase {   int depth = 0;   int count = 0;   private String indent(String t) {       StringBuffer s = new StringBuffer(depth + t.length());       for(int i = 0; i < depth; i++) s.append("    ");       s.append(t);       return s.toString();   }   public void characters(char [] ch, int start, int length) {       String s = indent("CHARS" + length + ": ");       s += new String(ch, start, length);       contents.add(s);   }   public void endDocument() {       depth -= 1;       String s = indent("EndDocument");       contents.add(s);   }   public void endElement(String name) {       depth -= 1;       String s = indent("EndElement: ");       s += name;       contents.add(s);   }   public void warning(SAXParseException e) {       depth -= 1;       String s = indent("Warning! ");       s += e.toString();       contents.add(s);   }   public void error(SAXParseException e) {       depth -= 1;       String s = indent("ERROR! ");       s += e.toString();       contents.add(s);   }   public void fatalError(SAXParseException e) {       depth = 0;       String s = indent("FATAL ERROR!!! ");       s += e.toString();       contents.add(s);   }   public void processingInstruction(String target, String data) {       String s = indent("ProcInstr: ");       s += target;       s += "/";       s += data;       contents.add(s);   }   public void startDocument() {       depth = 0;       String s = "StartDocument";       contents.add(s);       depth += 1;       count += 1;   }   public void startElement(String name, AttributeList alist) {       String s = indent("StartElement: ");       s += name;       contents.add(s);       depth += 3;       doAttributeList(alist);       depth -= 3;       depth += 1;       count += 1;   }   private void doAttributeList(AttributeList a) {       int i;       String s;       for(i = 0; i < a.getLength(); i++) {      s = indent("Attribute: ");      s += a.getName(i);      s += "=";      s += a.getValue(i);      contents.add(s);       }   }    }    /**     * Start the parsing when the user tells us to do so.     */    public void actionPerformed(ActionEvent e) {   String fn = filename.getText();   FileInputStream fis;   try {       fis = new FileInputStream(fn);   }   catch (IOException ex2) {       System.out.println("Bad file: " + fn);       return;   }   System.out.println("Creating InputSource...");   InputSource is = new InputSource(fis);   System.out.println("Creating and configuring Parser...");   com.sun.xml.parser.Parser myparser = new com.sun.xml.parser.Parser();   myparser.setFastStandalone(true);   org.xml.sax.Parser p = myparser;   ListingHandler lh = new ListingHandler();   p.setDocumentHandler(lh);   p.setErrorHandler(lh);   System.out.println("Clearing list..");   contents.removeAll();   try {       System.out.println("Parsing..");       p.parse(is);       System.out.println("Done, " + lh.count + " elements parsed.");   }   catch (Exception se) {       System.out.println("Parsing exception: " + se);       contents.add("Parsing Exception Thrown!!!");   }   try { fis.close(); } catch (IOException e4) { }    }    /**     * Main method - kick off the program.     */    public static void main(String args[]) {   XmlView1 v1 = new XmlView1();   v1.show();   v1.addWindowListener(new WindowAdapter() {       public void windowClosing(WindowEvent e) {      System.out.println("All done.  Bye.");      System.exit(0);       }   } );    }}//该片段来自于http://byrx.net