Internet search engine

Question

hello iam trying to get the simple Java applet that searches multiple Internet search engines. can any one help me
how to do in simple way....

Answer 1

Hi,
Please go through the above site you will find excellent codes.
Anyhow here is the sample Applet Search engine code.
import java.awt.*;
import java.applet.*;
import java.net.*;
import java.io.*;
import java.util.*;
// v1.5 Home Page Search applet
// 15th February 1998
* This applet provides search facilities for Web sites with no CGI access
* Copyright (c) 1997 Richard Everitt G4ZFE
* [email protected]
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
/* Applet parameters:
* This applet takes two parameters
* a. hostname, the name of the Demon Home Page (e.g babbage). The name is
* converted to lower case and used to create the URL of the
* pages to search i.e. http://www.<hostname>.demon.co.uk.
* (this parameter is required for Demon Internet users
* only)
* b. IPaddress, the corresponding IP address for the Home Page. I plan to
* use it as it will allow the search applet to run from
* behind a firewall. Demon have stated in the HomePage AUP
* that the IP address should not be directly used. I do not
* recommend its use (the www.babbage.demon.co.uk IP address
* has already changed once)
* (this parameter is optional)
* c. maxSearch, the maximum number of pages to search. If your site is vast
* then the search will take a long time so people will give
* up. This parameter limits the number of pages to be searched
* to a sensible value reducing the search time (but also
* reducing its usefullness)
* (this parameter is optional. Defaults to 100)
* d. debug, this parameter is for my use. Set to true to display
* parameter and debug information.
* (this parameter is optional)
* e. server, this parameter allows the search applet to be used on non-
* Demon home pages. This parameter should point to the name
* of the site, e.g "http://www.myisp.com/me/" (note use of
* trailing "/" character.
* (this parameter is required for Non-Demon Internet users)
* f. indexName, this parameter allows the search applet to be used on non-
* Demon home pages. This parameter should point to the name
* of the index page (e.g home.htm). If not set then
* "index.htm" ot "index.html" is asummed.
* (this parameter is optional)
* g. bgColour, The background colour for the applet in RGB hex format
* (rrggbb). The default is light grey.
* h. fgColour, The foreground colour for the applet in RGB hex format
* (rrggbb). The default is black.
* Example of applet use on a Demon Home Page - www.babbage.demon.co.uk
* <APPLET CODE="HomePageSearch.class" WIDTH=650 HEIGHT=400>
* <PARAM NAME="hostname" VALUE="babbage">
* <EM>Sorry but the Search applet requires a Java aware
* Web browser </EM>
* </APPLET>
* Example of applet use on a non-Demon Home Page - www.myisp.co.uk/fred/
* and the "index" page is called home.htm
* <APPLET CODE="HomePageSearch.class" WIDTH=650 HEIGHT=400>
* <PARAM NAME="server" VALUE="http://www.myisp.co.uk/fred/">
* <PARAM NAME="indexName" VALUE="home.htm">
* <EM>Sorry but the Search applet requires a Java aware
* Web browser </EM>
* </APPLET>
/* Modification history
* xxxx 12th February - alpha version
* v0.9 19th February - first beta version
* v0.91 26th February - tidy up
* - added maxSearch functionality
* - added debugMode parameter
* v0.92 03rd March - added server and indexname parameters to
* allow use on non-Demon home pages
* v0.93 09th March - fixed bug with lowercase filenames
* added case insensitive/sensitive/match whole
* word functionality
* v0.94 12th March - fixed bug which resulted in "cannot connect"
* error on non-demon sites.
* v0.95 15th March - Removed some uses of debugMode. Server parameter
* can be set to http://localhost/ to simulate this.
* - Added support for working behind proxy servers/
* firewalls. This uses the IP Address rather than
* the hostname of the server for connections.
* v0.96 17th March - Corrected code to parse HREFs. It was not
* understanding framed format or spaces.
* - Match whole word not working properly
* - HREF="http://server/" was not being followed
* correctly
* v0.97 20th March - fixed bug where incorrect page name was being
* displayed for a match. This was due to the use
* of a global variable for the page name. As the
* stack unwound then this variable was lost. Stack
* used to stored page name instead.
* v0.98 23rd March - if match found on index page (using HTTP) then URL to
* jump to was created incorrectly.
* v0.99 25th March - allow to be resized < 600 pixels
* allow handling of links such as
* "/www/page.html"
* v1.0 8th April - Added bgColour, fgColour applet parameters
* Set default of 100 for maximum number pages to search
* Added option menu for number of pages to search
* Allow handling of framed links such as
* <FRAME SRC="framepage.html">
* v1.1 18th April - Display Page title rather than page name in list of
* matches.
* If match found on index page (using FILE://) then
* URL to jump to was created incorrectly.
* Broke the <= 600 pixels code by adding the "Max
* Pages" option menu. Size of buttons adjusted to
* allow all widgets to be display in < 600 pixles
* v1.2 9th May - Removed hard limits by using vectors rather than
* arrays.
* Search the index page and index page links first.
* Added internalisation support for titles. A subset
* of the special character entity names (e.g &egrave;)
* are converted into Unicode characters so that they
* are displayed correctly.
* Fixed bug - "match word" did not match the last word
* on a line.
* v1.3 8th July - Bug fix release
* Links with single quotes e.g
* Test Page
* were not being searched
* fgColour and bgColour only worked with UNIX browsers!
* Fixed to allow useage with MS Windows browsers,
* although due to limitations in Win32 AWT the colour
* of buttons and their text cannot be changed.
* v1.4 4th August - Bug fix release
* Single quote HREF fix in v1.3 broke some normal
* HREF link code (no </A> on same line as HREF).
* v1.5 15th February - Applet now searches .txt files
* Fixed bug for demon internet users who use index
* pages other than index.htm and index.html
* Added further lower case localisation support
public class HomePageSearch extends Applet
final int MAX_NUMBER_PAGES = 100; // default limit of number
// pages to read
final int BACKSPACE_CHARACTER = 8; // ASCII backspace
final int NUMBER_SPECIAL_CHARS = 45; // Number of special character
// entity names supported
Button search, clear, abort; // GUI buttons
TextField inputArea; // TextField used to enter
// search text in
TextField statusArea; // TextField used to display
// search status
List resultsArea; // List to display matches in
public String hostName; // Host name paramter read by
// applet (required)
public String IPAddress; // IP address parameter read by
// applet (optional)
public int maxSearch = MAX_NUMBER_PAGES;
// Maximum number of pages to
// search (optional)
public boolean debugMode; // TRUE = localhost
// FALSE = on-line
Vector pageNames; // Pages that have been visited
public String server; // Non-Demon home page starting point
public String indexName; // Name of index page (defaults to
// index.html or index.htm)
SearchPages cp = null; // Search thread
Checkbox caseSensitive;
Checkbox caseInsensitive;
Checkbox matchWholeWord;
public boolean matchCase = false; // Flag to indicate if we
// need to match case.
public boolean matchWord = false; // Flag to indicate if we need
// to match the whole word
String versionNumber = "v1.5";
boolean packComponents; // Set to true if size < 600
Color bgColour; // Background colour of applet
Color fgColour; // Foreground colour of applet
Choice numPagesChoice; // Option menu to select max
// number of pages to search
Vector pageMatch; // Pages that contain the
// search word
public void init ()
Panel p;
getParameters (); // Read the applet parameters
setLayout (new BorderLayout ());
// If applet size is <= 600 pixels then reduce the length
// of text fields, labels etc so that the applet will
// display OK
if (size().width <= 600)
packComponents = true;
else
packComponents = false;
// This panel consists of a input text field where the
// user enters the text to search for. The buttons allow
// the search to be started, aborted and clear the applet's
// output fields.
p = new Panel();
p.setLayout (new FlowLayout());
Label lab = new Label ("Search for: ");
lab.setFont (new Font ("Helvetica", Font.PLAIN, 12));
p.add (lab);
if (packComponents)
inputArea = new TextField ("",15);
else
inputArea = new TextField ("",20);
p.add (inputArea);
if (packComponents)
search = new Button ("search");
search.setFont (new Font ("Helvetica", Font.BOLD, 12));
else
search = new Button (" search ");
search.setFont (new Font ("Helvetica", Font.BOLD, 14));
p.add (search);
if (packComponents)
clear = new Button ("clear");
clear.setFont (new Font ("Helvetica", Font.BOLD, 12));
else
clear = new Button (" clear ");
clear.setFont (new Font ("Helvetica", Font.BOLD, 14));
p.add (clear);
if (packComponents)
abort = new Button ("stop");
abort.setFont (new Font ("Helvetica", Font.BOLD, 12));
else
abort = new Button (" stop ");
abort.setFont (new Font ("Helvetica", Font.BOLD, 14));
abort.disable();
p.add (abort);
if (packComponents)
lab = new Label ("Pages");
else
lab = new Label (" Max. Pages:");
lab.setFont (new Font ("Helvetica", Font.PLAIN, 12));
p.add (lab);
numPagesChoice = new Choice();
p.add (numPagesChoice);
p.setForeground (fgColour);
p.setBackground (bgColour);
add ("North",p);
// This panel lists the results. When an item from the list
// box is double clicked the URL is opened up.
p = new Panel();
p.setLayout (new GridLayout(0,1));
resultsArea = new List (10,false);
p.add (resultsArea);
p.setForeground (fgColour);
p.setBackground (bgColour);
add ("Center",p);
p = new Panel();
Label labVersion = new Label (versionNumber);
labVersion.setFont (new Font ("Helvetica", Font.PLAIN, 12));
p.add (labVersion);
CheckboxGroup caseSense = new CheckboxGroup();
// This textfield shows the status of the search to provide
// some feedback to the user. The page count is displayed.
if (packComponents)
statusArea = new TextField ("",14);
else
statusArea = new TextField ("",20);
statusArea.setEditable (false);
p.add (statusArea);
if (packComponents)
caseInsensitive = new Checkbox ("in-sensitive");
else
caseInsensitive = new Checkbox ("case in-sensitive");
p.add (caseInsensitive);
caseInsensitive.setCheckboxGroup (caseSense);
if (packComponents)
caseSensitive = new Checkbox ("sensitive" );
else
caseSensitive = new Checkbox ("case sensitive" );
p.add (caseSensitive);
caseSensitive.setCheckboxGroup (caseSense);
caseSense.setCurrent (caseInsensitive);
if (packComponents)
matchWholeWord = new Checkbox ("whole word");
else
matchWholeWord = new Checkbox ("match whole word");
p.add (matchWholeWord);
p.setForeground (fgColour);
p.setBackground (bgColour);
add ("South",p);
disableButtons (); // Disable buttons until text entered
// Create vector to hold pages that have been found
// and pages that contain the search text
pageNames = new Vector();
pageMatch = new Vector();
// Now that we know what the maxSearch parameter is fill
// in sensible page numbers
for (int i=maxSearch / 5; i<= maxSearch; i += maxSearch / 5)
numPagesChoice.addItem (Integer.toString(i));
numPagesChoice.setFont (new Font ("Helvetica", Font.PLAIN, 12));
// Set the default number of pages to be searched
numPagesChoice.select (0);
maxSearch = maxSearch / 5;
// Set the background + foreground applet colours
// setBackground(bgColour);
// setForeground(fgColour);
// Always set text input field to white for readability
inputArea.setBackground (Color.white);
// Function enableButtons
// Purpose - enable use of buttons in GUI
public void enableButtons ()
search.enable();
clear.enable();
// Function disableButtons
// Purpose - disable use of buttons in GUI
final void disableButtons ()
search.disable();
clear.disable();
// Function getParameters
// Purpose - read applet parameters
final void getParameters ()
hostName = getParameter ("hostname");
IPAddress = getParameter ("IPAddress");
String num = getParameter ("maxSearch");
String arg = getParameter ("debug");
server = getParameter ("server");
indexName = getParameter ("indexName");
String colour = getParameter("bgColour");
if (colour == null)
// I wish this could be locali[sz]ed so that I could
// write lightGrey !!
bgColour = Color.lightGray;
else
try
bgColour = new Color(Integer.parseInt(colour, 16));
catch (NumberFormatException e)
bgColour=Color.lightGray;
colour = getParameter("fgColour");
if (colour == null)
fgColour = Color.black;
else
try
fgColour = new Color(Integer.parseInt(colour, 16));
catch (NumberFormatException e)
bgColour=Color.black;
// Check for missing parameters
if (hostName == null && server == null)
statusArea.setText ("Error - no host/server");
System.out.println (" Error: No hostname specified");
hostName = "none";
maxSearch = (num == null) ? MAX_NUMBER_PAGES : Integer.parseInt(num);
debugMode = (arg == null) ? false : true;
if (debugMode)
System.out.println ("hostname is " + hostName);
System.out.println ("IPAddress is " + IPAddress);
System.out.println ("maxSearch is " + maxSearch);
System.out.println ("debugMode is " + debugMode);
System.out.println ("server is " + server);
System.out.println ("indexName is " + indexName);
System.out.println ("bgColour is " + bgColour);
System.out.println ("fgColour is " + fgColour);
// Display parameter information
public String[][] getParameterInfo()
String[][] info =
{"hostname","String","hostname of site"},
{"IPAddress","String","IP address of site"},
{"maxSearch","String","maximum number of pages to search"},
{"debug","String","debug mode"},
{"server","String","Home Page URL"},
{"indexName","String","Name of index page"},
{"bgColour","Color","Background colour of applet"},
{"fgColour","Color","Foreground colour of applet"}
return info;
// Display applet information
public String getAppletInfo()
return "Home Page Search Applet v1.5";
// Function keyDown
// Purpose - enable or disable buttons. When search text is entered
// the search and clear buttons are enabled. When no search text has
// been entered the buttons are disabled.
public boolean keyDown (Event e, int nKey)
boolean boolDone = true;
String text;
text = inputArea.getText(); // Read the search text
int n = text.length(); // Count number of chars
if (nKey == BACKSPACE_CHARACTER)// catch backspace character
boolDone = false;
n--;
else
boolDone = false;
n++;
if (n > 0)
enableButtons ();
else
disableButtons ();
return (boolDone);
// Purpose - this function handles all the GUI events
public boolean action (Event e, Object o)
String text; // Search text entered by user
String searchText; // Lower case version of above
URL newURL = null;
// Check to see if the option menu has been selected
if (e.target instanceof Choice)
Choice c = (Choice) e.target;
try
maxSearch = Integer.parseInt(c.getSelectedItem(), 10);
catch (NumberFormatException ex)
maxSearch = MAX_NUMBER_PAGES;
if (debugMode)
System.out.println ("maxSearch is now " + maxSearch);
// Check to see if a checkbox has been pressed
if (e.target instanceof Checkbox)
if (caseSensitive.getState() == true)
matchCase = true;
else
matchCase = false;
if (matchWholeWord.getState() == true)
matchWord = true;
else
matchWord = false;
// A button has been pressed - determine which
if (e.target instanceof Button)
if (e.target == search)
// Search button pressed - read in
// search text entered
text = inputArea.getText();
// Make sure ther's somthing to search for
if (text.length() == 0)
return (false);
// New search so clear the GUI out
if (resultsArea.countItems() > 0)
resultsArea.clear();
disableButtons ();
abort.enable();
statusArea.setText("");
// Clear out previous search data
pageNames.removeAllElements();
pageMatch.removeAllElements();
// We're off - start the search thread
cp = new SearchPages (this, hostName, text, maxSearch);
cp.start();
else if (e.target == abort)
// Abort button pressed - stop the thread
if (cp != null)
cp.stop();
cp = null;
// Enable buttons for another search
enableButtons();
abort.disable();
else
// Clear button pressed - clear all the fields
// and return
inputArea.setText("");
statusArea.setText("");
// Clear radio buttons
caseSensitive.setState(false);
caseInsensitive.setState(true);
matchWholeWord.setState(false);
// Clear option menu
numPagesChoice.select (0);
try
maxSearch = Integer.parseInt(numPagesChoice.getSelectedItem(), 10);
catch (NumberFormatException ex)
maxSearch = MAX_NUMBER_PAGES;
if (debugMode)
System.out.println ("maxSearch is now " + maxSearch);
if (resultsArea.countItems() > 0)
resultsArea.clear();
cp = null;
// Selection made from the list of matches
if (e.target instanceof List)
List list = (List) e.target;
int index = list.getSelectedIndex();
// Extract the page name from the list
if (index < pageMatch.size())
String URLSelected = (String)pageMatch.elementAt(index);
try
// If URL stored then use it
if (URLSelected.startsWith ("http:") ||
URLSelected.startsWith ("file:"))
newURL = new URL(URLSelected);
else if (server == null)
newURL = new URL("http://www." + hostName + ".demon.co.uk/" + URLSelected);
else
newURL = new URL (server + URLSelected);
catch(MalformedURLException excep)
System.out.println("action(): Bad URL: " + newURL);
if (debugMode)
System.out.println (" Jumping to ... " + newURL.toString());
// Display the document
getAppletContext().showDocument(newURL,"_self");
return true; // We're done
// Purpose - checks to see if a page has already been
// visited by the search thread
boolean checkAlreadyFound (String page)
if (pageNames.size() == 0)
return (false);
// Check this is a new one
for (int i=1; i < pageNames.size() ;i++)
String pageName = (String) pageNames.elementAt(i);
if (pageName.equalsIgnoreCase (page))