在 Java 中解密 zip 流的过程可以通过不同的方式来实现,具体取决于你的需求和场景。以下是两种常见的方式:使用 Java 标准库和使用第三方库(如 Bouncy Castle)来解密 zip 流的方法。我们将分别介绍这两种方式的步骤流程,并提供相应的示例代码和依赖坐标。
步骤流程:
示例代码:
import java.io.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.spec.SecretKeySpec;
public class DecryptZipStream {
public static void main(String[] args) throws Exception {
// 输入文件和输出文件路径
String inputFile = "encrypted.zip";
String outputFile = "decrypted.zip";
String secretKey = "YourSecretKey"; // 替换为实际的密钥
// 创建输入流和输出流
FileInputStream fileInputStream = new FileInputStream(inputFile);
FileOutputStream fileOutputStream = new FileOutputStream(outputFile);
// 创建解密Cipher
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey.getBytes(), "AES");
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
// 创建解密输入流
CipherInputStream cipherInputStream = new CipherInputStream(fileInputStream, cipher);
// 创建ZipInputStream以解析zip文件
ZipInputStream zipInputStream = new ZipInputStream(cipherInputStream);
ZipOutputStream zipOutputStream = new ZipOutputStream(fileOutputStream);
// 逐个解密并写入解密后的zip文件
ZipEntry entry;
while ((entry = zipInputStream.getNextEntry()) != null) {
zipOutputStream.putNextEntry(new ZipEntry(entry.getName()));
byte[] buffer = new byte[1024];
int len;
while ((len = zipInputStream.read(buffer)) > 0) {
zipOutputStream.write(buffer, 0, len);
}
zipOutputStream.closeEntry();
}
// 关闭流
zipInputStream.close();
zipOutputStream.close();
fileInputStream.close();
fileOutputStream.close();
}
}
步骤流程:
示例代码:
首先,你需要在项目中添加 Bouncy Castle 库的依赖。以下是使用 Maven 和 Gradle 的依赖坐标示例:
Maven 依赖坐标:
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.68</version> <!-- 版本号根据最新版本进行更新 -->
</dependency>
Gradle 依赖坐标:
implementation 'org.bouncycastle:bcprov-jdk15on:1.68' // 版本号根据最新版本进行更新
接下来,使用以下示例代码解密 zip 流:
import java.io.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.spec.SecretKeySpec;
import java.security.Security;
public class DecryptZipStreamWithBC {
public static void main(String[] args) throws Exception {
// 添加Bouncy Castle作为安全提供程序
Security.addProvider(new BouncyCastleProvider());
// 输入文件和输出文件路径
String inputFile = "encrypted.zip";
String outputFile = "decrypted.zip";
String secretKey = "YourSecretKey"; // 替换为实际的密钥
// 创建输入流和输出流
FileInputStream fileInputStream = new FileInputStream(inputFile);
FileOutputStream fileOutputStream = new FileOutputStream(outputFile);
// 创建解密Cipher
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding", "BC");
SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey.getBytes(), "AES");
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
// 创建解密输入流
CipherInputStream cipherInputStream = new CipherInputStream(fileInputStream, cipher);
// 创建ZipInputStream以解析zip文件
ZipInputStream zipInputStream = new ZipInputStream(cipherInputStream);
ZipOutputStream zipOutputStream = new ZipOutputStream(fileOutputStream);
// 逐个解密并写入解密后的zip文件
ZipEntry entry;
while ((entry = zipInputStream.getNextEntry()) != null) {
zipOutputStream.putNextEntry(new ZipEntry(entry.getName()));
byte[] buffer = new byte[1024];
int len;
while ((len = zipInputStream.read(buffer)) > 0) {
zipOutputStream.write(buffer, 0, len);
}
zipOutputStream.closeEntry();
}
// 关闭流
zipInputStream.close();
zipOutputStream.close();
fileInputStream.close();
fileOutputStream.close();
}
}
请注意,在使用 Bouncy Castle 时,我们首先添加了该库作为安全提供程序,然后在创建 Cipher 时指定了提供程序名称("BC")。此外,依赖坐标中的版本号应根据最新版本进行更新。这个示例假定你已经安装了 Bouncy Castle 库。
无论你选择哪种方式,都需要替换示例代码中的密钥和输入/输出文件路径,确保它们符合你的实际需求。