java加密office文件
时间: 2024-01-27 11:07:26 浏览: 146
要对Office文件进行加密,可以使用Java Cryptography Extension (JCE)提供的API。以下是一个示例代码,演示如何使用JCE API加密和解密Office文件:
```java
import javax.crypto.*;
import javax.crypto.spec.*;
import java.io.*;
public class OfficeEncryption {
private static final String ALGORITHM = "AES/CBC/PKCS5Padding";
private static final int KEY_SIZE = 128;
private static final int BLOCK_SIZE = 16;
public static void encryptFile(File inputFile, File outputFile, String password) throws Exception {
SecretKeySpec keySpec = new SecretKeySpec(password.getBytes(), "AES");
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, keySpec, new IvParameterSpec(new byte[BLOCK_SIZE]));
FileInputStream inputStream = new FileInputStream(inputFile);
FileOutputStream outputStream = new FileOutputStream(outputFile);
CipherOutputStream cipherOutputStream = new CipherOutputStream(outputStream, cipher);
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
cipherOutputStream.write(buffer, 0, bytesRead);
}
inputStream.close();
cipherOutputStream.flush();
cipherOutputStream.close();
}
public static void decryptFile(File inputFile, File outputFile, String password) throws Exception {
SecretKeySpec keySpec = new SecretKeySpec(password.getBytes(), "AES");
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(new byte[BLOCK_SIZE]));
FileInputStream inputStream = new FileInputStream(inputFile);
CipherInputStream cipherInputStream = new CipherInputStream(inputStream, cipher);
FileOutputStream outputStream = new FileOutputStream(outputFile);
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = cipherInputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
cipherInputStream.close();
outputStream.flush();
outputStream.close();
}
public static void main(String[] args) throws Exception {
String password = "password";
File inputFile = new File("input.docx");
File encryptedFile = new File("encrypted.docx");
File decryptedFile = new File("decrypted.docx");
encryptFile(inputFile, encryptedFile, password);
decryptFile(encryptedFile, decryptedFile, password);
}
}
```
在这个示例中,我们使用了AES算法和CBC模式进行加密,并使用PKCS5Padding填充。加密和解密过程中使用的密码是“password”。你需要将其替换为你自己的密码。同时,你需要将“input.docx”替换为你自巻要加密的Office文件的路径。加密后的文件将保存在“encrypted.docx”中,解密后的文件将保存在“decrypted.docx”中。