import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ZipExample {
    public static void main(String[] args) {
        String zipFileName = "example.zip";
        
        try (ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(zipFileName))) {
            // Добавить файлы в пакет сжатия
            String fileToCompress = "file.txt";
            addToZipFile(fileToCompress, zipOutputStream);
            
            System.out.println("File compressed successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    private static void addToZipFile(String fileName, ZipOutputStream zipOutputStream) throws IOException {
        // Создайте объект ZipEntry и задайте имя файла.
        ZipEntry entry = new ZipEntry(fileName);
        zipOutputStream.putNextEntry(entry);
        
        // Записать содержимое файла в ZIP-файл
        // ...
        
        // Завершить сжатие текущего файла
        zipOutputStream.closeEntry();
    }
}

public class ZipExample {
    public static void main(String[] args) {
        String zipFileName = "example.zip";
        
        try (ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(zipFileName))) {
            // Добавить файлы в пакет сжатия
            String[] filesToCompress = {"file1.txt", "file2.txt", "file3.txt"};
            for (String file : filesToCompress) {
                addToZipFile(file, zipOutputStream);
            }
            
            System.out.println("Files compressed successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    // ...
}

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ZipExample {
    public static void main(String[] args) {
        String zipFileName = "example.zip";
        String folderToCompress = "folder";
        
        try (ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(zipFileName))) {
            // папка сжатие
            compressFolder(folderToCompress, folderToCompress, zipOutputStream);
            
            System.out.println("Folder compressed successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    private static void compressFolder(String sourceFolder, String folderName, ZipOutputStream zipOutputStream) throws IOException {
        File folder = new File(sourceFolder);
        File[] files = folder.listFiles();
        
        if (files != null) {
            for (File file : files) {
                if (file.isDirectory()) {
                    // сжатие подпапки
                    compressFolder(file.getAbsolutePath(), folderName + "/" + file.getName(), zipOutputStream);
                } else {
                    // файл сжатия
                    addToZipFile(folderName + "/" + file.getName(), file.getAbsolutePath(), zipOutputStream);
                }
            }
        }
    }
    
    private static void addToZipFile(String fileName, String fileAbsolutePath, ZipOutputStream zipOutputStream) throws IOException {
        // Создайте объект ZipEntry и задайте имя файла.
        ZipEntry entry = new ZipEntry(fileName);
        zipOutputStream.putNextEntry(entry);
        
        // Прочитайте содержимое файла и запишите в Zip-файл.
        try (FileInputStream fileInputStream = new FileInputStream(fileAbsolutePath)) {
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = fileInputStream.read(buffer)) != -1) {
                zipOutputStream.write(buffer, 0, bytesRead);
            }
        }
        
        // Завершить сжатие текущего файла
        zipOutputStream.closeEntry();
    }
}

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class UnzipExample {
    public static void main(String[] args) {
        String zipFileName = "example.zip";
        String outputFolder = "unzip";
        
        try (ZipInputStream zipInputStream = new ZipInputStream(new FileInputStream(zipFileName))) {
            // развязатьфайл сжатия
            unzipFiles(zipInputStream, outputFolder);
            
            System.out.println("Files unzipped successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    private static void unzipFiles(ZipInputStream zipInputStream, String outputFolder) throws IOException {
        byte[] buffer = new byte[1024];
        ZipEntry entry;
        
        while ((entry = zipInputStream.getNextEntry()) != null) {
            String fileName = entry.getName();
            File outputFile = new File(outputFolder + "/" + fileName);
            
            // Создать папку
            if (entry.isDirectory()) {
                outputFile.mkdirs();
            } else {
                // Создать файл и записать содержимое
                new File(outputFile.getParent()).mkdirs();
                try (FileOutputStream fileOutputStream = new FileOutputStream(outputFile)) {
                    int bytesRead;
                    while ((bytesRead = zipInputStream.read(buffer)) != -1) {
                        fileOutputStream.write(buffer, 0, bytesRead);
                    }
                }
            }
            
            zipInputStream.closeEntry();
        }
    }
}