如何在Java中实现Zip文件的压缩和解压缩

在Java中，可以使用java.util.zip包中的类来实现Zip文件的压缩和解压缩

1. 导入所需的库：

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

2. 压缩文件：

public class ZipExample {
    public static void main(String[] args) {
        String zipFileName = "example.zip";
        String[] filesToZip = {"file1.txt", "file2.txt", "file3.txt"};

        try {
            createZipFile(zipFileName, filesToZip);
            System.out.println("文件压缩成功!");
        } catch (IOException e) {
            System.out.println("文件压缩失败!");
            e.printStackTrace();
        }
    }

    public static void createZipFile(String zipFileName, String[] filesToZip) throws IOException {
        FileOutputStream fos = new FileOutputStream(zipFileName);
        ZipOutputStream zos = new ZipOutputStream(fos);

        for (String fileName : filesToZip) {
            File file = new File(fileName);
            FileInputStream fis = new FileInputStream(file);
            ZipEntry zipEntry = new ZipEntry(file.getName());
            zos.putNextEntry(zipEntry);

            byte[] bytesIn = new byte[4096];
            int read = 0;
            while ((read = fis.read(bytesIn)) != -1) {
                zos.write(bytesIn, 0, read);
            }

            zos.closeEntry();
            fis.close();
        }

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

3. 解压缩文件：

public class UnzipExample {
    public static void main(String[] args) {
        String zipFileName = "example.zip";
        String destDirectory = "output";

        try {
            unzipFile(zipFileName, destDirectory);
            System.out.println("文件解压缩成功!");
        } catch (IOException e) {
            System.out.println("文件解压缩失败!");
            e.printStackTrace();
        }
    }

    public static void unzipFile(String zipFileName, String destDirectory) throws IOException {
        File destDir = new File(destDirectory);
        if (!destDir.exists()) {
            destDir.mkdir();
        }

        ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFileName));
        ZipEntry zipEntry = zis.getNextEntry();

        while (zipEntry != null) {
            String filePath = destDirectory + File.separator + zipEntry.getName();
            if (!zipEntry.isDirectory()) {
                extractFile(zis, filePath);
            } else {
                File dir = new File(filePath);
                dir.mkdirs();
            }

            zis.closeEntry();
            zipEntry = zis.getNextEntry();
        }

        zis.close();
    }

    public static void extractFile(ZipInputStream zis, String filePath) throws IOException {
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filePath));
        byte[] bytesIn = new byte[4096];
        int read = 0;
        while ((read = zis.read(bytesIn)) != -1) {
            bos.write(bytesIn, 0, read);
        }

        bos.close();
    }
}

这些示例展示了如何使用Java的java.util.zip包来压缩和解压缩文件。请确保将示例中的文件名更改为实际的文件名。