使用AES算法对文件进行加密解密（JAVA+Eclipse）

一、项目中引用第三方类库的方法

    Bouncy Castle类库的用法（如何在自己的项目中使用第三方类库）

    1）手动配置


*     将.jar,src,javadoc拷到项目目录下
*    项目名，右键选build path-configure build path
    2）使用Maven 或Gradle来配置//在线配置第三方依赖包

*     http://mvnrepository.com 搜索 bouncy castle
*     新建Gradle Project（File->New->other->Gradle->Gradle Project）
*     找到 bouncy
castle最新版本的gradle配置字符串将其添加到项目build.gradle配置文件中的dependencies条目的最后（}前的位置处）。添加完后，保存build.gradle配置文件，然后在项目身上右键->gradle->refresh
gradle project.
二、最终事先效果（没有设置选择解密后文件保存位置的功能，只能存在于加密文件相同的位置）



三、文件加密解密程序实现主要代码（秘钥自动生成，不需要用户输入秘钥）
public class MyFileEncryptor { @SuppressWarnings("static-access") //文件加密的实现方法
public static void encryptFile(String fileName,String encryptedFileName){ try {
FileInputStream fis = new FileInputStream(fileName); FileOutputStream fos = new
FileOutputStream(encryptedFileName); //秘钥自动生成 KeyGenerator
keyGenerator=KeyGenerator.getInstance("AES"); keyGenerator.init(128); Key
key=keyGenerator.generateKey(); byte[] keyValue=key.getEncoded();
fos.write(keyValue);//记录输入的加密密码的消息摘要 SecretKeySpec encryKey= new
SecretKeySpec(keyValue,"AES");//加密秘钥 byte[] ivValue=new byte[16]; Random random
= new Random(System.currentTimeMillis()); random.nextBytes(ivValue);
IvParameterSpec iv = new IvParameterSpec(ivValue);//获取系统时间作为IV
fos.write("MyFileEncryptor".getBytes());//文件标识符 fos.write(ivValue); //记录IV
Cipher cipher = Cipher.getInstance("AES/CFB/PKCS5Padding");
cipher.init(cipher.ENCRYPT_MODE, encryKey,iv); CipherInputStream cis=new
CipherInputStream(fis, cipher); byte[] buffer=new byte[1024]; int n=0;
while((n=cis.read(buffer))!=-1){ fos.write(buffer,0,n); } cis.close();
fos.close(); } catch (InvalidKeyException e) { // TODO Auto-generated catch
block e.printStackTrace(); } catch (FileNotFoundException e) { // TODO
Auto-generated catch block e.printStackTrace(); } catch
(NoSuchAlgorithmException e) { // TODO Auto-generated catch block
e.printStackTrace(); } catch (NoSuchPaddingException e) { // TODO
Auto-generated catch block e.printStackTrace(); } catch
(InvalidAlgorithmParameterException e) { // TODO Auto-generated catch block
e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch
block e.printStackTrace(); } } @SuppressWarnings("static-access") //文件解密的实现代码
public static void decryptedFile(String encryptedFileName,String
decryptedFileName){ try { FileInputStream fis = new
FileInputStream(encryptedFileName); FileOutputStream fos = new
FileOutputStream(decryptedFileName); byte[] fileIdentifier=new byte[15]; byte[]
keyValue=new byte[16]; fis.read(keyValue);//读记录的文件加密密码的消息摘要
fis.read(fileIdentifier); if(new String
(fileIdentifier).equals("MyFileEncryptor")){ SecretKeySpec key= new
SecretKeySpec(keyValue,"AES"); byte[] ivValue= new byte[16];
fis.read(ivValue);//获取IV值 IvParameterSpec iv= new IvParameterSpec(ivValue);
Cipher cipher = Cipher.getInstance("AES/CFB/PKCS5Padding");
cipher.init(cipher.DECRYPT_MODE, key,iv); CipherInputStream cis= new
CipherInputStream(fis, cipher); byte[] buffer=new byte[1024]; int n=0;
while((n=cis.read(buffer))!=-1){ fos.write(buffer,0,n); } cis.close();
fos.close(); JOptionPane.showMessageDialog(null, "解密成功"); }else{
JOptionPane.showMessageDialog(null, "文件不是我加密的，爱找谁着谁去"); } } catch
(InvalidKeyException e) { // TODO Auto-generated catch block
e.printStackTrace(); } catch (HeadlessException e) { // TODO Auto-generated
catch block e.printStackTrace(); } catch (FileNotFoundException e) { // TODO
Auto-generated catch block e.printStackTrace(); } catch
(NoSuchAlgorithmException e) { // TODO Auto-generated catch block
e.printStackTrace(); } catch (NoSuchPaddingException e) { // TODO
Auto-generated catch block e.printStackTrace(); } catch
(InvalidAlgorithmParameterException e) { // TODO Auto-generated catch block
e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch
block e.printStackTrace(); } } public static void main(String[] args) {
Security.addProvider(new BouncyCastleProvider()); } }图形界面的实现代码:public class
Encryptor extends JFrame { private JPanel contentPane; private JTextField
textFieldSelected; private JButton btnEncryptFile; private JButton
btnDecryptFile; /** * Launch the application. */ public static void
main(String[] args) { Security.addProvider(new BouncyCastleProvider());
EventQueue.invokeLater(new Runnable() { public void run() { try { Encryptor
frame = new Encryptor(); frame.setVisible(true); } catch (Exception e) {
e.printStackTrace(); } } }); } /** * Create the frame. */ public Encryptor() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300);
contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane); contentPane.setLayout(null); btnEncryptFile = new
JButton("\u52A0\u5BC6"); btnEncryptFile.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent arg0) { String
fileName=textFieldSelected.getText(); String encryptedFileName=fileName+".enc";
MyFileEncryptor.encryptFile(fileName, encryptedFileName);
JOptionPane.showMessageDialog(null, "加密成功"); } }); btnEncryptFile.setBounds(14,
213, 113, 27); contentPane.add(btnEncryptFile); btnDecryptFile = new
JButton("\u89E3\u5BC6"); btnDecryptFile.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e) { String
decryptedFile=textFieldSelected.getText(); String fileType=".enc"; String
decryptedFileName=decryptedFile.substring(0,
decryptedFile.length()-fileType.length()); String
encryptedFileName=textFieldSelected.getText();
MyFileEncryptor.decryptedFile(encryptedFileName, decryptedFileName); } });
btnDecryptFile.setBounds(292, 213, 113, 27); contentPane.add(btnDecryptFile);
textFieldSelected = new JTextField(); textFieldSelected.setBounds(14, 92, 360,
24); contentPane.add(textFieldSelected); textFieldSelected.setColumns(10);
JButton buttonSelect = new JButton("......");
buttonSelect.addActionListener(new ActionListener() { public void
actionPerformed(ActionEvent e) { JFileChooser fileChooser=new
JFileChooser("D:");
if(fileChooser.showOpenDialog(null)==JFileChooser.APPROVE_OPTION){
textFieldSelected.setText(fileChooser.getSelectedFile().getPath()); } } });
buttonSelect.setBounds(378, 91, 40, 27); contentPane.add(buttonSelect); JLabel
label = new JLabel("\u9009\u62E9\u6587\u4EF6\uFF1A"); label.setBounds(14, 74,
97, 18); contentPane.add(label); JLabel lblAes = new
JLabel("AES\u52A0\u5BC6\uFF0C\u5BC6\u94A5\u957F\u5EA6128");
lblAes.setBounds(132, 29, 153, 18); contentPane.add(lblAes); } }

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