visual basic 6.0 barcode generator 6: Crawling the Web with Java in Java

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6: Crawling the Web with Java
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// Flag for whether or not crawling is underway. private boolean crawling; // Matches log file print writer. private PrintWriter logFileWriter; // Constructor for Search Web Crawler. public SearchCrawler() { // Set application title. setTitle("Search Crawler"); // Set window size. setSize(600, 600); // Handle window closing events. addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { actionExit(); } }); // Set up File menu. JMenuBar menuBar = new JMenuBar(); JMenu fileMenu = new JMenu("File"); fileMenu.setMnemonic(KeyEvent.VK_F); JMenuItem fileExitMenuItem = new JMenuItem("Exit", KeyEvent.VK_X); fileExitMenuItem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { actionExit(); } }); fileMenu.add(fileExitMenuItem); menuBar.add(fileMenu); setJMenuBar(menuBar); // Set up search panel. JPanel searchPanel = new JPanel(); GridBagConstraints constraints; GridBagLayout layout = new GridBagLayout(); searchPanel.setLayout(layout); JLabel startLabel = new JLabel("Start URL:"); constraints = new GridBagConstraints();
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constraints.anchor = GridBagConstraints.EAST; constraints.insets = new Insets(5, 5, 0, 0); layout.setConstraints(startLabel, constraints); searchPanel.add(startLabel); startTextField = new JTextField(); constraints = new GridBagConstraints(); constraints.fill = GridBagConstraints.HORIZONTAL; constraints.gridwidth = GridBagConstraints.REMAINDER; constraints.insets = new Insets(5, 5, 0, 5); layout.setConstraints(startTextField, constraints); searchPanel.add(startTextField); JLabel maxLabel = new JLabel("Max URLs to Crawl:"); constraints = new GridBagConstraints(); constraints.anchor = GridBagConstraints.EAST; constraints.insets = new Insets(5, 5, 0, 0); layout.setConstraints(maxLabel, constraints); searchPanel.add(maxLabel); maxComboBox = new JComboBox(MAX_URLS); maxComboBox.setEditable(true); constraints = new GridBagConstraints(); constraints.insets = new Insets(5, 5, 0, 0); layout.setConstraints(maxComboBox, constraints); searchPanel.add(maxComboBox); limitCheckBox = new JCheckBox("Limit crawling to Start URL site"); constraints = new GridBagConstraints(); constraints.anchor = GridBagConstraints.WEST; constraints.insets = new Insets(0, 10, 0, 0); layout.setConstraints(limitCheckBox, constraints); searchPanel.add(limitCheckBox); JLabel blankLabel = new JLabel(); constraints = new GridBagConstraints(); constraints.gridwidth = GridBagConstraints.REMAINDER; layout.setConstraints(blankLabel, constraints); searchPanel.add(blankLabel); JLabel logLabel = new JLabel("Matches Log File:"); constraints = new GridBagConstraints(); constraints.anchor = GridBagConstraints.EAST; constraints.insets = new Insets(5, 5, 0, 0);
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layout.setConstraints(logLabel, constraints); searchPanel.add(logLabel); String file = System.getProperty("user.dir") + System.getProperty("file.separator") + "crawler.log"; logTextField = new JTextField(file); constraints = new GridBagConstraints(); constraints.fill = GridBagConstraints.HORIZONTAL; constraints.gridwidth = GridBagConstraints.REMAINDER; constraints.insets = new Insets(5, 5, 0, 5); layout.setConstraints(logTextField, constraints); searchPanel.add(logTextField); JLabel searchLabel = new JLabel("Search String:"); constraints = new GridBagConstraints(); constraints.anchor = GridBagConstraints.EAST; constraints.insets = new Insets(5, 5, 0, 0); layout.setConstraints(searchLabel, constraints); searchPanel.add(searchLabel); searchTextField = new JTextField(); constraints = new GridBagConstraints(); constraints.fill = GridBagConstraints.HORIZONTAL; constraints.insets = new Insets(5, 5, 0, 0); constraints.gridwidth= 2; constraints.weightx = 1.0d; layout.setConstraints(searchTextField, constraints); searchPanel.add(searchTextField); caseCheckBox = new JCheckBox("Case Sensitive"); constraints = new GridBagConstraints(); constraints.insets = new Insets(5, 5, 0, 5); constraints.gridwidth = GridBagConstraints.REMAINDER; layout.setConstraints(caseCheckBox, constraints); searchPanel.add(caseCheckBox); searchButton = new JButton("Search"); searchButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { actionSearch(); } }); constraints = new GridBagConstraints();
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constraints.gridwidth = GridBagConstraints.REMAINDER; constraints.insets = new Insets(5, 5, 5, 5); layout.setConstraints(searchButton, constraints); searchPanel.add(searchButton); JSeparator separator = new JSeparator(); constraints = new GridBagConstraints(); constraints.fill = GridBagConstraints.HORIZONTAL; constraints.gridwidth = GridBagConstraints.REMAINDER; constraints.insets = new Insets(5, 5, 5, 5); layout.setConstraints(separator, constraints); searchPanel.add(separator); JLabel crawlingLabel1 = new JLabel("Crawling:"); constraints = new GridBagConstraints(); constraints.anchor = GridBagConstraints.EAST; constraints.insets = new Insets(5, 5, 0, 0); layout.setConstraints(crawlingLabel1, constraints); searchPanel.add(crawlingLabel1); crawlingLabel2 = new JLabel(); crawlingLabel2.setFont( crawlingLabel2.getFont().deriveFont(Font.PLAIN)); constraints = new GridBagConstraints(); constraints.fill = GridBagConstraints.HORIZONTAL; constraints.gridwidth = GridBagConstraints.REMAINDER; constraints.insets = new Insets(5, 5, 0, 5); layout.setConstraints(crawlingLabel2, constraints); searchPanel.add(crawlingLabel2); JLabel crawledLabel1 = new JLabel("Crawled URLs:"); constraints = new GridBagConstraints(); constraints.anchor = GridBagConstraints.EAST; constraints.insets = new Insets(5, 5, 0, 0); layout.setConstraints(crawledLabel1, constraints); searchPanel.add(crawledLabel1); crawledLabel2 = new JLabel(); crawledLabel2.setFont( crawledLabel2.getFont().deriveFont(Font.PLAIN)); constraints = new GridBagConstraints(); constraints.fill = GridBagConstraints.HORIZONTAL; constraints.gridwidth = GridBagConstraints.REMAINDER; constraints.insets = new Insets(5, 5, 0, 5);
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layout.setConstraints(crawledLabel2, constraints); searchPanel.add(crawledLabel2); JLabel toCrawlLabel1 = new JLabel("URLs to Crawl:"); constraints = new GridBagConstraints(); constraints.anchor = GridBagConstraints.EAST; constraints.insets = new Insets(5, 5, 0, 0); layout.setConstraints(toCrawlLabel1, constraints); searchPanel.add(toCrawlLabel1); toCrawlLabel2 = new JLabel(); toCrawlLabel2.setFont( toCrawlLabel2.getFont().deriveFont(Font.PLAIN)); constraints = new GridBagConstraints(); constraints.fill = GridBagConstraints.HORIZONTAL; constraints.gridwidth = GridBagConstraints.REMAINDER; constraints.insets = new Insets(5, 5, 0, 5); layout.setConstraints(toCrawlLabel2, constraints); searchPanel.add(toCrawlLabel2); JLabel progressLabel = new JLabel("Crawling Progress:"); constraints = new GridBagConstraints(); constraints.anchor = GridBagConstraints.EAST; constraints.insets = new Insets(5, 5, 0, 0); layout.setConstraints(progressLabel, constraints); searchPanel.add(progressLabel); progressBar = new JProgressBar(); progressBar.setMinimum(0); progressBar.setStringPainted(true); constraints = new GridBagConstraints(); constraints.fill = GridBagConstraints.HORIZONTAL; constraints.gridwidth = GridBagConstraints.REMAINDER; constraints.insets = new Insets(5, 5, 0, 5); layout.setConstraints(progressBar, constraints); searchPanel.add(progressBar); JLabel matchesLabel1 = new JLabel("Search Matches:"); constraints = new GridBagConstraints(); constraints.anchor = GridBagConstraints.EAST; constraints.insets = new Insets(5, 5, 10, 0); layout.setConstraints(matchesLabel1, constraints); searchPanel.add(matchesLabel1);
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