import java.awt.*;import java.awt.event.*;import java.io.*;import java.security.MessageDigest;import javax.swing.*;public class WGetMD5 extends JFrame {private JFrame frm = this;private JTextField tf = new JTextField(100);private JTextField Txt_md5 = new JTextField(30);private File file = null;private JLabel title = new JLabel();private JButton Btn_file = new JButton("选择");private JButton Btn_calc = new JButton("计算");private JButton Btn_exit = new JButton("退出");private JLabel Lab_file = new JLabel("文件名:");private JProgressBar bar = new JProgressBar(JProgressBar.HORIZONTAL, 0, 100);public WGetMD5() throws HeadlessException {frm.setLayout(null);frm.setTitle("计算MD5");title.setFont(new Font("楷体_GB2312", Font.BOLD, 30));title.setForeground(Color.RED);title.setText("MD5计算程序");title.setBounds(100, 10, 200, 32);frm.add(title);Lab_file.setBounds(10, 50, 50, 22);frm.add(Lab_file);tf.setBounds(60, 50, 200, 22);tf.setEditable(false);frm.add(tf);Btn_file.setBounds(280, 50, 70, 22);Btn_file.addActionListener(new ChooseFile());frm.add(Btn_file);bar.setBounds(30, 90, 300, 12);bar.setVisible(false);frm.add(bar);Txt_md5.setBounds(60, 85, 250, 22);Txt_md5.setBackground(Color.GRAY);Txt_md5.setForeground(Color.YELLOW);Txt_md5.setEditable(false);Txt_md5.setVisible(false);frm.add(Txt_md5);Btn_calc.setBounds(80, 120, 70, 22);Btn_calc.setEnabled(false);Btn_calc.addActionListener(new CalculateMD5());frm.add(Btn_calc);Btn_exit.setBounds(200, 120, 70, 22);Btn_exit.addActionListener(new ExitPrograme());frm.add(Btn_exit);frm.setBounds(100, 100, 400, 200);frm.setResizable(false);frm.setDefaultCloseOperation(EXIT_ON_CLOSE);frm.setVisible(true);}// 以下是各按钮的监听器class ChooseFile implements ActionListener {public void actionPerformed(ActionEvent e) {JFileChooser chooser = new JFileChooser("e:/");int returnVal = chooser.showOpenDialog(frm);if (returnVal == JFileChooser.APPROVE_OPTION) {file = chooser.getSelectedFile();tf.setText(file.getAbsolutePath());Btn_calc.setEnabled(true);Txt_md5.setVisible(false);}}}class ExitPrograme implements ActionListener {public void actionPerformed(ActionEvent e) {frm.dispose();System.exit(0);}}class CalculateMD5 implements ActionListener {public void actionPerformed(ActionEvent e) {// 启动一个计算MD5的线程Txt_md5.setVisible(false);bar.setVisible(true);new Thread(new GetMD5()).start();}}class GetMD5 implements Runnable {/** * @param buf * 含Md5码的字节数组 * @return MD5码的十六进制表示，存放在字符串中 */private String ByteArray2String(byte[] buf) {char hexChar[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8','9', 'a', 'b', 'c', 'd', 'e', 'f' };// MD5码由16个字节，128位组成，转换成32个字符char[] md5 = new char[32];int k = 0;for (byte b : buf) {md5[k++] = hexChar[b >>> 4 & 0xf];md5[k++] = hexChar[b & 0xf];}String md5String = new String(md5);return md5String;}public void run() {String res = null;long length = file.length();long cur_len = 0, old_len = 0, step = 1;try {MessageDigest md = MessageDigest.getInstance("MD5");BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));byte[] b = new byte[4096];int c = 0;c = in.read(b);while (c >= 0) {cur_len += c;if (c == b.length)md.update(b);elsemd.update(b, 0, c);if ((cur_len - old_len) * 100 / length > step) {bar.setValue((int) (cur_len * 100 / length));old_len = cur_len;}c = in.read(b);}in.close();res = ByteArray2String(md.digest());} catch (Exception e) {e.printStackTrace();}bar.setVisible(false);Txt_md5.setText(res);Txt_md5.setVisible(true);}}public static void main(String[] args) {new WGetMD5();}}
