用java写一段压缩加密文件夹的代码

以下是一个Java代码示例，可以对文件夹进行压缩和加密：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.spec.SecretKeySpec;

public class FolderCompressor {
    
    private static final String PASSWORD = "myPassword"; // 加密密码
    private static final int BUFFER_SIZE = 4096;
    
    public static void compressAndEncryptFolder(String sourceFolder, String outputZipFile) throws Exception {
        // 创建输出流
        FileOutputStream fos = new FileOutputStream(outputZipFile);
        // 创建Zip输出流
        ZipOutputStream zos = new ZipOutputStream(fos);
        // 设置加密密码
        SecretKeySpec key = new SecretKeySpec(PASSWORD.getBytes(), "AES");
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        // 将加密输出流封装到Zip输出流中
        CipherOutputStream cos = new CipherOutputStream(zos, cipher);
        // 压缩文件夹
        addFolderToZip(sourceFolder, sourceFolder, cos);
        // 关闭流
        cos.close();
        zos.close();
        fos.close();
    }
    
    private static void addFolderToZip(String rootFolder, String sourceFolder, CipherOutputStream cos) throws Exception {
        File folder = new File(sourceFolder);
        for (String fileName : folder.list()) {
            String filePath = sourceFolder + File.separator + fileName;
            if (new File(filePath).isDirectory()) {
                // 如果是文件夹，递归调用
                addFolderToZip(rootFolder, filePath, cos);
            } else {
                // 如果是文件，加入Zip输出流
                ZipEntry zipEntry = new ZipEntry(filePath.substring(rootFolder.length() + 1));
                cos.putNextEntry(zipEntry);
                FileInputStream fis = new FileInputStream(filePath);
                byte[] buffer = new byte[BUFFER_SIZE];
                int length;
                while ((length = fis.read(buffer)) > 0) {
                    cos.write(buffer, 0, length);
                }
                fis.close();
            }
        }
    }
}

使用时，只需要调用 `compressAndEncryptFolder` 方法，并传入要压缩加密的文件夹路径和输出Zip文件路径即可：

FolderCompressor.compressAndEncryptFolder("path/to/source/folder", "path/to/output/file.zip");

需要注意的是，这里使用了AES算法进行加密，加密密码为"myPassword"。如果需要更高的安全性，可以考虑使用其他加密算法和更复杂的密码。