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@inaz2
Last active Apr 26, 2016
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SHA-1 Calculator (Java+Swing) / http://inaz2.hatenablog.com/entry/2016/04/26/203045
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingWorker;
import javax.swing.TransferHandler;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableModel;
public class SHA1Calculator extends JFrame {
private JPanel contentPane;
private DefaultTableModel model;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
SHA1Calculator frame = new SHA1Calculator();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public SHA1Calculator() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 600, 300); // expanded default frame size
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
setTitle("SHA-1 Calculator");
// create scrollable JTable
model = new DefaultTableModel(new String[]{"File Path", "sha1sum"}, 0);
JTable table = new JTable(model);
JScrollPane scrollPane = new JScrollPane(table);
contentPane.add(scrollPane);
// enable file drop
contentPane.setTransferHandler(new DropFileHandler());
}
private class DropFileHandler extends TransferHandler {
@Override
public boolean canImport(TransferSupport support) {
// Check if dropped data is files
return (support.isDrop()
&& support.isDataFlavorSupported(DataFlavor.javaFileListFlavor));
}
@Override
@SuppressWarnings("unchecked")
public boolean importData(TransferSupport support) {
if (!canImport(support)) {
return false;
}
Transferable t = support.getTransferable();
List<File> files = null;
try {
files = (List<File>) t.getTransferData(DataFlavor.javaFileListFlavor);
} catch (UnsupportedFlavorException | IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
for (File file : files) {
String path = file.getAbsolutePath();
model.addRow(new String[]{path, "calculating..."});
ModelUpdater mu = new ModelUpdater(path, model.getRowCount()-1);
mu.execute();
}
return true;
}
}
private class ModelUpdater extends SwingWorker<String, Long> {
private String path;
private Integer rowindex;
public ModelUpdater(String path, Integer rowindex) {
this.path = path;
this.rowindex = rowindex;
}
@Override
public String doInBackground() throws IOException {
MessageDigest md = null;
try {
md = MessageDigest.getInstance("SHA-1");
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// update digest with each 8MB chunk
long totalBytes = (new File(path)).length();
long currentBytes = 0;
try (FileInputStream istream = new FileInputStream(path)) {
byte[] buf = new byte[8*1024*1024];
int n;
while ((n = istream.read(buf, 0, buf.length)) != -1) {
md.update(Arrays.copyOf(buf, n));
currentBytes += n;
publish(100*currentBytes/totalBytes);
}
} catch (IOException e) {
e.printStackTrace();
}
byte[] digest = md.digest();
StringBuilder sb = new StringBuilder();
for (byte b : digest) {
sb.append(String.format("%02x", b));
}
return sb.toString();
}
@Override
protected void process(List<Long> values) {
// only last one is effective
String message = String.format("calculating %d%%...", values.get(values.size()-1));
model.setValueAt(message, rowindex, 1);
}
@Override
protected void done() {
try {
model.setValueAt(get(), rowindex, 1);
} catch (Exception ignore) {
}
}
}
}
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