用java代码写一个应用程序，实现输入一个文件夹目录，或者文件目录，把整个文件夹（包括里面的子文件夹）压缩成rar或zip文件，也可以实现rar或zip文件的解压缩

你好，这个问题可以回答。以下是Java代码示例：

压缩文件夹：

import java.io.*;
import java.util.zip.*;

public class ZipFolder {
    public static void main(String[] args) throws Exception {
        String sourceFolder = "path/to/source/folder";
        String zipFile = "path/to/zip/file.zip";
        zipFolder(sourceFolder, zipFile);
    }

    public static void zipFolder(String sourceFolder, String zipFile) throws Exception {
        FileOutputStream fos = new FileOutputStream(zipFile);
        ZipOutputStream zos = new ZipOutputStream(fos);

        addFolderToZip("", sourceFolder, zos);

        zos.close();
        fos.close();
    }

    private static void addFolderToZip(String path, String sourceFolder, ZipOutputStream zos) throws Exception {
        File folder = new File(sourceFolder);
        for (String fileName : folder.list()) {
            String filePath = sourceFolder + File.separator + fileName;
            if (new File(filePath).isDirectory()) {
                addFolderToZip(path + folder.getName() + "/", filePath, zos);
            } else {
                byte[] buffer = new byte[1024];
                FileInputStream fis = new FileInputStream(filePath);
                zos.putNextEntry(new ZipEntry(path + folder.getName() + "/" + fileName));
                int length;
                while ((length = fis.read(buffer)) > 0) {
                    zos.write(buffer, 0, length);
                }
                zos.closeEntry();
                fis.close();
            }
        }
    }
}

解压缩文件：

import java.io.*;
import java.util.zip.*;

public class UnzipFile {
    public static void main(String[] args) throws Exception {
        String zipFile = "path/to/zip/file.zip";
        String destFolder = "path/to/destination/folder";
        unzipFile(zipFile, destFolder);
    }

    public static void unzipFile(String zipFile, String destFolder) throws Exception {
        byte[] buffer = new byte[1024];
        ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFile));
        ZipEntry zipEntry = zis.getNextEntry();
        while (zipEntry != null) {
            String fileName = zipEntry.getName();
            File newFile = new File(destFolder + File.separator + fileName);
            new File(newFile.getParent()).mkdirs();
            FileOutputStream fos = new FileOutputStream(newFile);
            int length;
            while ((length = zis.read(buffer)) > 0) {
                fos.write(buffer, 0, length);
            }
            fos.close();
            zipEntry = zis.getNextEntry();
        }
        zis.closeEntry();
        zis.close();
    }
}