fileencrypt.java

文件加密程序

/*
 * FileEncrypt.java
 *
 * Created on 2007年12月20日, 上午9:17
 */

package fileencrpt;
import javax.swing.*;
import java.io.*;
import java.security.*;
import java.security.spec.*;
import javax.crypto.*;
import javax.crypto.spec.*;

/**
 *
 * @author  Administrator
 */
public class FileEncrypt extends javax.swing.JFrame {
    
    /** Creates new form FileEncrypt */
    public FileEncrypt() {
        initComponents();
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc=" 生成的代码 ">//GEN-BEGIN:initComponents
    private void initComponents() {
        jLabel1 = new javax.swing.JLabel();
        jTextField2 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jButton4 = new javax.swing.JButton();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jPasswordField1 = new javax.swing.JPasswordField();
        jPasswordField2 = new javax.swing.JPasswordField();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("\u738b\u6c0f\u52a0\u5bc6\u89e3\u5bc6");
        setBounds(new java.awt.Rectangle(300, 100, 0, 0));
        setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
        setIconImage(getIconImage());
        setResizable(false);
        jLabel1.setText("\u6e90\u6587\u4ef6\uff1a");
        jLabel1.getAccessibleContext().setAccessibleName("");

        jButton1.setText("\u6d4f\u89c8");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton3.setText("\u52a0\u5bc6");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        jButton4.setText("\u89e3\u5bc6");
        jButton4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton4ActionPerformed(evt);
            }
        });

        jLabel3.setText("\u5bc6\u7801\uff1a");

        jLabel4.setText("\u786e\u8ba4\uff1a");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel1)
                    .addComponent(jLabel3)
                    .addComponent(jLabel4))
                .addGap(16, 16, 16)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jPasswordField1, javax.swing.GroupLayout.DEFAULT_SIZE, 241, Short.MAX_VALUE)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jButton3)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 127, Short.MAX_VALUE)
                        .addComponent(jButton4))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 178, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jButton1))
                    .addComponent(jPasswordField2, javax.swing.GroupLayout.DEFAULT_SIZE, 241, Short.MAX_VALUE))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(26, 26, 26)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jButton1))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel3)
                    .addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel4)
                    .addComponent(jPasswordField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton3)
                    .addComponent(jButton4))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton4ActionPerformed
// TODO 将在此处添加您的处理代码：
        String password = new String(jPasswordField1.getPassword());
        String confirm = new String(jPasswordField2.getPassword());
        if(!password.equals(confirm))
        {
            JOptionPane.showMessageDialog(this, "两次密码不一致");
            return;
        }
        if(password.length() > 16)
        {
            JOptionPane.showMessageDialog(this, "密码不能多于16个字符");
            return;
        }
        if(!new File(jTextField2.getText()).exists())
        {
            JOptionPane.showMessageDialog(this, "源文件不存在");
            return;
        }
        if(!jTextField2.getText().endsWith(".wa"))
        {
            JOptionPane.showMessageDialog(this, "请确定你选择的是密文文件");
            return;
        }
        try 
        {
            byte[] bs = Md5(password);
            Key key = new SecretKeySpec(bs, "AES");
            Cipher cp = Cipher.getInstance("AES");
            cp.init(Cipher.DECRYPT_MODE, key);
            FileOutputStream out = new FileOutputStream(jTextField2.getText().replaceAll(".wa", ""));
            CipherInputStream in = new CipherInputStream(new FileInputStream(jTextField2.getText()), cp);
            int i;
            while((i=in.read())!=-1)
            {
                out.write(i);
            }
            out.flush();
            JOptionPane.showMessageDialog(this, "解密成功");
            in.close();
            out.close();
        } 
        catch (Exception ex) 
        {
            ex.printStackTrace();
        }
    }//GEN-LAST:event_jButton4ActionPerformed

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton3ActionPerformed
// TODO 将在此处添加您的处理代码：
        String password = new String(jPasswordField1.getPassword());
        String confirm = new String(jPasswordField2.getPassword());
        if(!password.equals(confirm))
        {
            JOptionPane.showMessageDialog(this, "两次密码不一致");
            return;
        }
        if(password.length() > 16)
        {
            JOptionPane.showMessageDialog(this, "密码不能多于16个字符");
            return;
        }
        if(!new File(jTextField2.getText()).exists())
        {
            JOptionPane.showMessageDialog(this, "源文件不存在");
            return;
        }
        try 
        {
            byte[] bs = Md5(password);
            Key key = new SecretKeySpec(bs, "AES");
            Cipher cp = Cipher.getInstance("AES");
            cp.init(Cipher.ENCRYPT_MODE, key);
            CipherOutputStream out = new CipherOutputStream(new FileOutputStream(jTextField2.getText()+".wa"), cp);
            FileInputStream in = new FileInputStream(jTextField2.getText());
            int i;
            while((i=in.read())!=-1)
            {
                out.write(i);
            }
            out.flush();
            in.close();
            out.close();
            JOptionPane.showMessageDialog(this, "加密成功");
        } 
        catch (Exception ex) 
        {
            ex.printStackTrace();
        }
    }//GEN-LAST:event_jButton3ActionPerformed

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed
// TODO 将在此处添加您的处理代码：
        JFileChooser jfc = new JFileChooser();
        if(jfc.showOpenDialog(this) == 0)
            jTextField2.setText(jfc.getSelectedFile().getAbsolutePath());
    }//GEN-LAST:event_jButton1ActionPerformed
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new FileEncrypt().setVisible(true);
            }
        });
    }
    private static byte[] Md5(String plainText ) {
        byte[] b;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(plainText.getBytes());
            b = md.digest();
            return b;
        } 
        catch (NoSuchAlgorithmException e) {
            e.printStackTrace(); 
        } 
        return null;
    } 

    // 变量声明 - 不进行修改//GEN-BEGIN:variables
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton3;
    private javax.swing.JButton jButton4;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JPasswordField jPasswordField1;
    private javax.swing.JPasswordField jPasswordField2;
    private javax.swing.JTextField jTextField2;
    // 变量声明结束//GEN-END:variables
    
}