Blob Image Example

package matthews.mark;
 
/*
 
 MySQL and Java Developer's Guide
 
 Mark Matthews, Jim Cole, Joseph D. Gradecki
 Publisher Wiley,
 Published February 2003, 
 ISBN 0471269239
 
 */
 
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
import java.util.Vector;
 
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
 
public class IDlook extends JFrame {
 
    private JButton getAccountButton, updateAccountButton, insertAccountButton,
	    nextButton, previousButton, lastButton, firstButton;
 
    private JList accountNumberList;
 
    private JTextField accountIDText, nailFileText, thumbIDText;
 
    private JTextArea errorText;
 
    private Connection connection;
 
    private Statement statement;
 
    private ResultSet rs;
 
    private ImageIcon icon = null;
 
    private ImageIcon iconThumbnail = null;
 
    JLabel photographLabel;
 
    public IDlook() {
	try {
	    Class.forName("com.mysql.jdbc.Driver").newInstance();
	} catch (Exception e) {
	    System.err.println("Unable to find and load driver");
	    System.exit(1);
	}
    }
 
    private void loadAccounts() {
	Vector v = new Vector();
	try {
	    rs = statement.executeQuery("SELECT * FROM thumbnail");
 
	    while (rs.next()) {
		v.addElement(rs.getString("acc_id"));
	    }
	} catch (SQLException e) {
	    displaySQLErrors(e);
	}
	accountNumberList.setListData(v);
    }
 
    private void buildGUI() {
	Container c = getContentPane();
	c.setLayout(new FlowLayout());
 
	accountNumberList = new JList();
	loadAccounts();
	accountNumberList.setVisibleRowCount(2);
	JScrollPane accountNumberListScrollPane = new JScrollPane(
		accountNumberList);
 
	// Do Get Account Button
	getAccountButton = new JButton("Get Account");
	getAccountButton.addActionListener(new ActionListener() {
	    public void actionPerformed(ActionEvent e) {
		try {
		    rs.beforeFirst();
		    while (rs.next()) {
			if (rs.getString("acc_id").equals(
				accountNumberList.getSelectedValue()))
			    break;
		    }
		    if (!rs.isAfterLast()) {
			accountIDText.setText(rs.getString("acc_id"));
			thumbIDText.setText(rs.getString("thumb_id"));
 
			icon = new ImageIcon(rs.getBytes("pic"));
			createThumbnail();
			photographLabel.setIcon(iconThumbnail);
		    }
		} catch (SQLException selectException) {
		    displaySQLErrors(selectException);
		}
	    }
	});
 
	// Do Update Account Button
	updateAccountButton = new JButton("Update Account");
	updateAccountButton.addActionListener(new ActionListener() {
	    public void actionPerformed(ActionEvent e) {
		try {
		    byte[] bytes = new byte[50000];
		    FileInputStream fs = new FileInputStream(nailFileText
			    .getText());
		    BufferedInputStream bis = new BufferedInputStream(fs);
		    bis.read(bytes);
 
		    rs.updateBytes("thumbnail.pic", bytes);
		    rs.updateRow();
		    bis.close();
 
		    accountNumberList.removeAll();
		    loadAccounts();
		} catch (SQLException insertException) {
		    displaySQLErrors(insertException);
		} catch (Exception generalE) {
		    generalE.printStackTrace();
		}
	    }
	});
 
	// Do insert Account Button
	insertAccountButton = new JButton("Insert Account");
	insertAccountButton.addActionListener(new ActionListener() {
	    public void actionPerformed(ActionEvent e) {
		try {
		    byte[] bytes = new byte[50000];
		    FileInputStream fs = new FileInputStream(nailFileText
			    .getText());
		    BufferedInputStream bis = new BufferedInputStream(fs);
		    bis.read(bytes);
 
		    rs.moveToInsertRow();
		    rs.updateInt("thumb_id", Integer.parseInt(thumbIDText
			    .getText()));
		    rs.updateInt("acc_id", Integer.parseInt(accountIDText
			    .getText()));
		    rs.updateBytes("pic", bytes);
		    rs.updateObject("sysobject", null);
		    rs.updateTimestamp("ts", new Timestamp(0));
		    rs.updateTimestamp("act_ts", new Timestamp(
			    new java.util.Date().getTime()));
		    rs.insertRow();
		    bis.close();
 
		    accountNumberList.removeAll();
		    loadAccounts();
		} catch (SQLException insertException) {
		    displaySQLErrors(insertException);
		} catch (Exception generalE) {
		    generalE.printStackTrace();
		}
	    }
	});
 
	photographLabel = new JLabel();
	photographLabel.setHorizontalAlignment(JLabel.CENTER);
	photographLabel.setVerticalAlignment(JLabel.CENTER);
	photographLabel.setVerticalTextPosition(JLabel.CENTER);
	photographLabel.setHorizontalTextPosition(JLabel.CENTER);
 
	JPanel first = new JPanel(new GridLayout(4, 1));
	first.add(accountNumberListScrollPane);
	first.add(getAccountButton);
	first.add(updateAccountButton);
	first.add(insertAccountButton);
 
	accountIDText = new JTextField(15);
	thumbIDText = new JTextField(15);
	errorText = new JTextArea(5, 15);
	errorText.setEditable(false);
 
	JPanel second = new JPanel();
	second.setLayout(new GridLayout(2, 1));
	second.add(thumbIDText);
	second.add(accountIDText);
 
	JPanel third = new JPanel();
	third.add(new JScrollPane(errorText));
 
	nailFileText = new JTextField(25);
 
	c.add(first);
	c.add(second);
	c.add(third);
	c.add(nailFileText);
	c.add(photographLabel);
 
	setSize(500, 500);
	show();
    }
 
    public void connectToDB() {
	try {
	    connection = DriverManager
		    .getConnection("jdbc:mysql://192.168.1.25/identification?user=spider&password=spider");
	    statement = connection.createStatement(
		    ResultSet.TYPE_SCROLL_INSENSITIVE,
		    ResultSet.CONCUR_UPDATABLE);
 
	} catch (SQLException connectException) {
	    System.out.println(connectException.getMessage());
	    System.out.println(connectException.getSQLState());
	    System.out.println(connectException.getErrorCode());
	    System.exit(1);
	}
    }
 
    private void displaySQLErrors(SQLException e) {
	errorText.append("SQLException: " + e.getMessage() + "\n");
	errorText.append("SQLState:     " + e.getSQLState() + "\n");
	errorText.append("VendorError:  " + e.getErrorCode() + "\n");
    }
 
    private void init() {
	connectToDB();
    }
 
    private void createThumbnail() {
	int maxDim = 350;
	try {
	    Image inImage = icon.getImage();
 
	    double scale = (double) maxDim / (double) inImage.getHeight(null);
	    if (inImage.getWidth(null) > inImage.getHeight(null)) {
		scale = (double) maxDim / (double) inImage.getWidth(null);
	    }
 
	    int scaledW = (int) (scale * inImage.getWidth(null));
	    int scaledH = (int) (scale * inImage.getHeight(null));
 
	    BufferedImage outImage = new BufferedImage(scaledW, scaledH,
		    BufferedImage.TYPE_INT_RGB);
 
	    AffineTransform tx = new AffineTransform();
 
	    if (scale < 1.0d) {
		tx.scale(scale, scale);
	    }
 
	    Graphics2D g2d = outImage.createGraphics();
	    g2d.drawImage(inImage, tx, null);
	    g2d.dispose();
 
	    iconThumbnail = new ImageIcon(outImage);
	} catch (Exception e) {
	    e.printStackTrace();
	}
    }
 
    public static void main(String[] args) {
	IDlook id = new IDlook();
 
	id.addWindowListener(new WindowAdapter() {
	    public void windowClosing(WindowEvent e) {
		System.exit(0);
	    }
	});
 
	id.init();
	id.buildGUI();
    }
}