java对zip包加密解密
时间: 2023-05-23 11:04:58 浏览: 748
Java可以使用ZipOutputStream和ZipInputStream来处理zip文件。要加密zip文件,可以使用加密算法对压缩文件中的每个条目进行加密。以下是一个例子:
```java
import java.io.*;
import java.security.*;
import java.util.*;
import java.util.zip.*;
public class ZipEncryptor {
public static void encryptZip(String zipFile, String password) throws IOException, NoSuchAlgorithmException, InvalidKeyException {
byte[] buffer = new byte[1024];
ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFile));
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(zipFile + ".encrypted"));
zos.setMethod(ZipOutputStream.DEFLATED);
zos.setLevel(Deflater.DEFAULT_COMPRESSION);
byte[] key = password.getBytes();
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, keySpec);
ZipEntry entry;
while ((entry = zis.getNextEntry()) != null) {
zos.putNextEntry(new ZipEntry(entry.getName()));
int len;
while ((len = zis.read(buffer)) > 0) {
byte[] encrypted = cipher.update(buffer, 0, len);
zos.write(encrypted, 0, encrypted.length);
}
byte[] finalEncrypted = cipher.doFinal();
zos.write(finalEncrypted, 0, finalEncrypted.length);
zos.closeEntry();
}
zis.close();
zos.close();
}
public static void decryptZip(String zipFile, String password) throws IOException, NoSuchAlgorithmException, InvalidKeyException {
byte[] buffer = new byte[1024];
ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFile));
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(zipFile + ".decrypted"));
zos.setMethod(ZipOutputStream.DEFLATED);
zos.setLevel(Deflater.DEFAULT_COMPRESSION);
byte[] key = password.getBytes();
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, keySpec);
ZipEntry entry;
while ((entry = zis.getNextEntry()) != null) {
zos.putNextEntry(new ZipEntry(entry.getName()));
int len;
while ((len = zis.read(buffer)) > 0) {
byte[] decrypted = cipher.update(buffer, 0, len);
zos.write(decrypted, 0, decrypted.length);
}
byte[] finalDecrypted = cipher.doFinal();
zos.write(finalDecrypted, 0, finalDecrypted.length);
zos.closeEntry();
}
zis.close();
zos.close();
}
}
```
为了加密zip文件,可以调用`encryptZip`方法,并将zip文件路径和密码作为参数传递。文件将被加密并写入同一目录下的`.encrypted`文件中。要解密加密的zip文件,可以调用`decryptZip`方法,并将加密文件路径和密码作为参数传递。文件将被解密并写入同一目录下的`.decrypted`文件中。