一个简单的文件加密器(java)

package day20.file; import java.awt.BorderLayout; import java.awt.Container; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.RandomAccessFile; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JCheckBox; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.SwingConstants; /** Create 2009-2-23 */ public class FileCode_GUI extends JFrame implements ActionListener { /** * */ private static final long serialVersionUID = 1L; private Container content; private JLabel label[] = new JLabel[5]; private JTextField text[] = new JTextField[3]; private JButton button[] = new JButton[4]; private JCheckBox box; private File file1 = null; private File file2 = null; // 密码算子 private int code = 0; public FileCode_GUI() { this.setTitle("文件加密器1.0"); content = this.getContentPane(); this.setBounds(300, 200, 300, 210); this.setLayout(new BorderLayout(10, 10)); // 加入标签 String labstr[] = { "文件加密器", " 源文件", "目标文件", "加密算子", "(0-255)" }; for (int i = 0; i < label.length; i++) { label[i] = new JLabel(labstr[i]); label[i].setHorizontalAlignment(SwingConstants.RIGHT); } // 文本框 for (int i = 0; i < text.length; i++) { text[i] = new JTextField(14); text[i].setText(""); } // 设置不可编辑 text[0].setEditable(false); text[1].setEditable(false); // 按钮 String but[] = { "浏览1", "浏览2", "确定", "清空" }; for (int i = 0; i < button.length; i++) { button[i] = new JButton(but[i]); button[i].addActionListener(this); } // 复选框 box = new JCheckBox("覆盖源文件"); box.addActionListener(this); // 第一个标签添加到北面 label[0].setHorizontalAlignment(SwingConstants.CENTER); content.add(label[0], BorderLayout.NORTH); // 添加中间组件 JPanel panel = new JPanel(); panel.setBorder(BorderFactory.createEtchedBorder()); panel.setLayout(new FlowLayout(FlowLayout.LEFT)); panel.add(label[1]); panel.add(text[0]); panel.add(button[0]); panel.add(label[2]); panel.add(text[1]); panel.add(button[1]); panel.add(label[3]); panel.add(text[2]); panel.add(label[4]); panel.add(box); content.add(panel, BorderLayout.CENTER); // 添加南面组件 JPanel p3 = new JPanel(); p3.add(button[2]); p3.add(button[3]); content.add(p3, BorderLayout.SOUTH); } public void showMe() { this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setResizable(false); } /** * @param args */ public static void main(String[] args) { new FileCode_GUI().showMe(); } @Override public void actionPerformed(ActionEvent arg0) { if (arg0.getActionCommand().trim().equals("浏览1")) { JFileChooser jf = new JFileChooser(); jf.showOpenDialog(this); file1 = jf.getSelectedFile(); text[0].setText(file1.getAbsolutePath()); } else if (arg0.getActionCommand().trim().equals("确定")) { int temp = Integer.parseInt(text[2].getText()); if (temp < 0 || temp > 255) { JOptionPane.showMessageDialog(this, "加密算子 输入有误", "提示信息", JOptionPane.ERROR_MESSAGE); } else { code = temp; if (box.isSelected()) { // 如果复选框为选中状态 RandomAccessFile raf = null; try { raf = new RandomAccessFile(file1, "rw"); int a; while ((a = raf.read()) != -1) { raf.seek(raf.getFilePointer() - 1); raf.write(a ^ code); } JOptionPane.showMessageDialog(this, "文件加密成功！！！", "提示信息", JOptionPane.INFORMATION_MESSAGE); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { // 关闭 if (raf != null) { try { raf.close(); } catch (IOException e) { e.printStackTrace(); } } } } else { // 不选中状态 FileInputStream fis = null; FileOutputStream fos = null; BufferedInputStream bis = null; BufferedOutputStream bos = null; try { fis = new FileInputStream(file1); fos = new FileOutputStream(file2); bis = new BufferedInputStream(fis); bos = new BufferedOutputStream(fos); while (bis.available() > 0) { bos.write(bis.read() ^ code); } JOptionPane.showMessageDialog(this, "文件加密成功！！！", "提示信息", JOptionPane.INFORMATION_MESSAGE); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { // 关闭 if (bis != null) { try { bis.close(); } catch (IOException e) { e.printStackTrace(); } } if (bos != null) { try { bos.close(); } catch (IOException e) { e.printStackTrace(); } } } } } } else if (arg0.getActionCommand().trim().equals("清空")) { for (int i = 0; i < text.length; i++) { text[i].setText(""); } } else if (arg0.getActionCommand().trim().equals("浏览2")) { JFileChooser jf = new JFileChooser(); jf.showOpenDialog(this); file2 = jf.getSelectedFile(); text[1].setText(file2.getAbsolutePath()); } else if (arg0.getActionCommand().equals("覆盖源文件")) { if (box.isSelected()) { text[1].setText(file1.getAbsolutePath()); } else { text[1].setText(""); } } } }