Sample work:

Image Content-Based Retrieval Using Chromaticity Moments

All papers are copyright of the corresponding journal publisher and/or authors.

Simple Browser:

// // Simple Browser, version -1.0 // Nth Research: Institute of Informatics & Imaging // Notice: The present software is provided without any warranty or claim // It may be used for personal or educational purposes, but not for any commercial/monetary benefit // Purpose: reduce use of mouse // Method: uses link numbers // Instructions: type a link number (b/f to go back/forward) // import java.awt.*; import java.awt.event.*; import java.net.*; import java.io.*; import javax.swing.*; import javax.swing.event.*; import java.util.*; import javax.swing.JOptionPane; public class Browser extends JFrame { int currentLink=0; JLabel linkLabel=new JLabel("Enter link:"), urlLabel=new JLabel("URL:"); JButton back=new JButton("Back"), front=new JButton("Front"); JTextField enterField, linkField; JComboBox linkList=new JComboBox(); JEditorPane contentsArea; JPanel bottom=new JPanel(), top=new JPanel(); Vector links=new Vector(), linksVisited=new Vector(); String currentPage=""; public Browser() { super("Simple Browser -1.0"); Container container = getContentPane(); // Clean any previous run int i=0; File fl=new File(System.getProperty("user.dir").toString()+File.separatorChar+"tmp-"+i+".html"); while(fl.exists()) { fl.delete(); i++; fl=new File(System.getProperty("user.dir").toString()+File.separatorChar+"tmp-"+i+".html"); } enterField=new JTextField("", 30); enterField.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent event) { currentPage=enterField.getText().trim(); try { URL urlLink; urlLink = new URL(currentPage); } catch (MalformedURLException e) { JOptionPane.showMessageDialog(null, "Enter a correct URL (e.g., http://www.abc.com)", "Bad URL", JOptionPane.ERROR_MESSAGE); return; } if(currentPage.indexOf("http://")!=0) currentPage="http://"+currentPage; // Start a new potential line of visit pages: remove all links after this, delete files as well int i=currentLink+1; while(linksVisited.size()>currentLink+1) { linksVisited.remove(currentLink+1); File fl=new File(System.getProperty("user.dir").toString()+File.separatorChar+"tmp-"+i+".html"); fl.delete(); i++; } linksVisited.add((String)currentPage); links.removeAllElements(); links.add(new String(currentPage)); searchForLinks(); getCurrentPage(); linkField.requestFocus(); } } ); back.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent event) { getPreviousPage(); } } ); front.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent event) { getNextPage(); } } ); top.add(back); top.add(front); top.add(urlLabel); top.add(enterField); container.add(top, BorderLayout.NORTH); bottom.add(linkLabel); linkField=new JTextField("", 20); // linkField.setToolTipText("Enter a link number (seen in parentheses on the page), or b to go Back or f to go Forward"); linkField.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent event) { String ac=event.getActionCommand(); if(ac.equals("b")) getPreviousPage(); else if(ac.equals("f")) getNextPage(); else { try { int i=Integer.parseInt(ac); System.out.println("i entered "+i); if(i<1 || i>links.size()-1) // System.out.println("Enter an integer from 1 to "+(links.size()-1)); JOptionPane.showMessageDialog(null, "Enter an integer from 1 to "+(links.size()-1), "Bad input", JOptionPane.ERROR_MESSAGE); else { currentPage=(String)links.get(i); currentLink++; // Start a new potential line of visit pages: remove all links after this while(linksVisited.size()>currentLink+1) { linksVisited.remove(currentLink+1); } linksVisited.add((String)currentPage); links.removeAllElements(); links.add(new String(currentPage)); searchForLinks(); getCurrentPage(); } } catch(NumberFormatException ne) { JOptionPane.showMessageDialog(null, "Enter an integer from 1 to "+(links.size()-1), "Bad input", JOptionPane.ERROR_MESSAGE); } } } } ); bottom.add(linkField); // JScrollPane scrollPane = new JScrollPane(linkList); // bottom.add(linkList); // bottom.add(scrollPane); bottom.add(linkList); container.add(bottom, BorderLayout.SOUTH); contentsArea=new JEditorPane(); contentsArea.setEditable(false); contentsArea.addHyperlinkListener( new HyperlinkListener() { public void hyperlinkUpdate(HyperlinkEvent event) { if(event.getEventType()==HyperlinkEvent.EventType.ACTIVATED) getThePage(event.getURL().toString()); } } ); container.add(new JScrollPane(contentsArea), BorderLayout.CENTER); setSize(1000, 800); setVisible(true); enterField.requestFocus(); // set default for URL access URLConnection.setDefaultAllowUserInteraction(false); }//constructor() // Find links and write them back with numbering public void searchForLinks() { int howMany=0, i; String outFname="tmp-"+currentLink+".html", line=""; BufferedWriter outputS=null; try { outputS=new BufferedWriter(new FileWriter(outFname)); } catch(FileNotFoundException e) { System.out.println("opening file error"); } catch (IOException e) { System.out.println("opening file error"); } // if(currentPage.length()==0) currentPage="http://www.NthResearch.org"; if (currentPage.length() == 0) { System.out.println("ERROR: must enter a starting URL"); return; } System.out.println("searching " + currentPage); URL url; try { url = new URL(currentPage); }catch (MalformedURLException e) { System.out.println("ERROR: invalid URL " + currentPage); return; } // can only search http: protocol URLs /* if (url.getProtocol().compareTo("http") != 0) { System.out.println("ERROR: not protocol " + strURL); break; } */ try {//1 // try opening the URL URLConnection urlConnection = url.openConnection(); System.out.println("got 1 "); urlConnection.setAllowUserInteraction(false); System.out.println("got 2 "); InputStream urlStream = url.openStream(); System.out.println("got 3 "); // String type=urlConnection.guessContentTypeFromStream(urlStream); System.out.println("got 3a "); /* if (type == null) { System.out.println("ERROR: type " + strURL); break; } if (type.compareTo("text/html") != 0) { System.out.println("ERROR: compare to " + strURL); break; } */ // search the input stream for links // first, read in the entire URL byte b[] = new byte[1000]; System.out.println("got 3b "); int numRead = urlStream.read(b); System.out.println("got 3c "); String content = new String(b, 0, numRead); System.out.println("got 3d "); while (numRead != -1) { System.out.println("reading more "); /* if (Thread.currentThread() != searchThread) { System.out.println("ERROR: thread " + strURL); break; } */ System.out.println("got 3e "); numRead = urlStream.read(b); System.out.println("got 3f "); if (numRead != -1) { String newContent = new String(b, 0, numRead); // System.out.println("got " + newContent); content += newContent; } System.out.println("ending more "); }//while() System.out.println("got 4 "); urlStream.close(); // System.out.println("got " + content); /* if (Thread.currentThread() != searchThread) { System.out.println("ERROR: thread " + strURL); break; } */ String lowerCaseContent = content.toLowerCase(); int index0=0, index=0, index2=0; /////////////////////// // // Searching for links // /////////////////////// while ((index = lowerCaseContent.indexOf("<a", index)) != -1) { if ((index2 = lowerCaseContent.indexOf("/a>", index)) == -1) { System.out.println("ERROR: href " + currentPage); break; } // Write part up to here, then link with number try { line=content.substring(index0, index); outputS.write(line, 0, line.length()); line=content.substring(index, index2+3); line=line+" ("+howMany+") "; outputS.write(line, 0, line.length()); } catch(FileNotFoundException e) {System.out.println("opening file error");} String sub=lowerCaseContent.substring(index, index2+3); System.out.print("found: "+lowerCaseContent.substring(index, index2+3)+" -> "); index=0; if ((index = sub.indexOf("href", index)) == -1) { System.out.println("ERROR: href " + currentPage); break; } if ((index = sub.indexOf("=", index)) == -1) { System.out.println("ERROR: = " + currentPage); break; } howMany++; index++; String remaining = sub.substring(index); StringTokenizer st = new StringTokenizer(remaining, " tnr">#"); String strLink = st.nextToken(); System.out.println(strLink); if(strLink.indexOf("www.")==-1) strLink=currentPage+"/"+strLink; if(strLink.indexOf("http://")!=0) strLink="http://"+strLink; links.add(new String(strLink)); URL urlLink; try { urlLink = new URL(url, strLink); strLink = urlLink.toString(); } catch (MalformedURLException e) { System.out.println("ERROR: bad URL " + strLink); continue; } index=index0=index2+3; }//while() linkList.removeAllItems(); for(i=1; i<links.size(); i++) { linkList.addItem((Object)(new Integer(i)).toString()); // linkList.addItem((Object)(new String((String)(links.get(i))))); } // Write rest of it try { line=content.substring(index0); outputS.write(line, 0, line.length()); outputS.close(); } catch(FileNotFoundException e) {System.out.println("opening file error");} } catch (IOException e) { JOptionPane.showMessageDialog(this, "Couldn't open "+currentPage, "Bad URL", JOptionPane.ERROR_MESSAGE); return; } System.out.println(links); }//searchForLinks() private void getThePage(String location) { System.out.println("location "+location); try { contentsArea.setPage(location); enterField.setText(location); } catch (IOException ioException) { JOptionPane.showMessageDialog(this, "Error retrieving specified URL", "Bad URL", JOptionPane.ERROR_MESSAGE); } currentLink++; }//getThePage() private void getCurrentPage() { String location="file:"+File.separatorChar+System.getProperty("user.dir").toString()+File.separatorChar+"tmp-"+currentLink+".html"; System.out.println("location "+location); try { contentsArea.setPage(location); enterField.setText((String)(links.get(0))); } catch (IOException ioException) { JOptionPane.showMessageDialog(this, "Error retrieving specified URL", "Bad URL", JOptionPane.ERROR_MESSAGE); } }//getCurrentPage() private void getPreviousPage() { currentLink=(currentLink-1)%linksVisited.size(); String location="file:"+File.separatorChar+System.getProperty("user.dir").toString()+File.separatorChar+"tmp-"+currentLink+".html"; System.out.println("location "+location); try { contentsArea.setPage(location); enterField.setText((String)(linksVisited.get(currentLink))); } catch (IOException ioException) { JOptionPane.showMessageDialog(this, "Error retrieving specified URL", "Bad URL", JOptionPane.ERROR_MESSAGE); } }//getPreviousPage() private void getNextPage() { currentLink=(currentLink+1)%linksVisited.size(); String location="file:"+File.separatorChar+System.getProperty("user.dir").toString()+File.separatorChar+"tmp-"+currentLink+".html"; System.out.println("location "+location); try { contentsArea.setPage(location); enterField.setText((String)(linksVisited.get(currentLink))); } catch (IOException ioException) { JOptionPane.showMessageDialog(this, "Error retrieving specified URL", "Bad URL", JOptionPane.ERROR_MESSAGE); } }//getNextPage() public static void main(String args[]) { Browser app=new Browser(); app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } }