如何在Java中创建加密Zip

在Java中创建加密的ZIP文件，您可以使用Java库中的java.util.zip和java.security.MessageDigest

1. 首先，确保您已将所需的依赖项添加到项目中。如果您使用的是Maven，请将以下代码添加到pom.xml文件中：

<dependencies>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-compress</artifactId>
        <version>1.21</version>
    </dependency>
</dependencies>

2. 然后，编写一个方法来创建加密的ZIP文件：

import org.apache.commons.compress.archivers.zip.*;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.zip.Deflater;

public class EncryptedZipCreator {

    public static void main(String[] args) {
        String[] filesToZip = {"file1.txt", "file2.txt"};
        String zipFileName = "encrypted.zip";
        String password = "your_password";

        try {
            createEncryptedZip(filesToZip, zipFileName, password);
            System.out.println("Encrypted ZIP file created successfully.");
        } catch (IOException | NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }

    public static void createEncryptedZip(String[] filesToZip, String zipFileName, String password) throws IOException, NoSuchAlgorithmException {
        // Create a new ZIP file and write the encrypted content to it
        try (FileOutputStream fos = new FileOutputStream(zipFileName);
             ZipOutputStream zos = new ZipOutputStream(fos)) {

            // Generate a SHA-256 hash of the password for encryption key
            MessageDigest md = MessageDigest.getInstance("SHA-256");
            byte[] passwordBytes = password.getBytes(StandardCharsets.UTF_8);
            byte[] hashedPassword = md.digest(passwordBytes);

            // Compress each file and add it to the ZIP archive
            for (String filePath : filesToZip) {
                File file = new File(filePath);
                byte[] fileBytes = Files.readAllBytes(file.toPath());

                // Compress the file content
                Deflater deflater = new Deflater(Deflater.BEST_COMPRESSION);
                deflater.setInput(fileBytes);
                byte[] compressedData = new byte[1024];
                int compressedSize;

                while ((compressedSize = deflater.deflate(compressedData)) > 0) {
                    zos.write(compressedData, 0, compressedSize);
                }

                // Write the encrypted file header
                ZipEntry zipEntry = new ZipEntry(file.getName());
                zos.putNextEntry();
                zos.write(hashedPassword);
                zos.closeEntry();
            }
        }
    }
}

这个示例代码将创建一个名为encrypted.zip的加密ZIP文件，其中包含两个文本文件（file1.txt和file2.txt）。请注意，您需要将your_password替换为您选择的密码。

此代码使用Java内置的Deflater类来压缩文件内容，并使用SHA-256哈希算法生成密码的加密密钥。然后，它将每个文件的内容写入ZIP存档，并在文件头中存储加密密钥。