Apache Commons Compress 如何实现文件压缩与解压

Apache Commons Compress 是一个用于处理压缩文件的开源 Java 库，它支持多种压缩格式，包括 ZIP、TAR、GZIP、BZIP2 等。

下面是使用 Apache Commons Compress 实现文件压缩与解压的示例代码：

## 压缩文件

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.ArchiveOutputStream;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream;

public class FileCompressor {

    public static void compress(File source, File destination) throws Exception {
        try (FileOutputStream fos = new FileOutputStream(destination);
             GzipCompressorOutputStream gzos = new GzipCompressorOutputStream(fos);
             TarArchiveOutputStream tos = new TarArchiveOutputStream(gzos)) {
            
            ArchiveEntry entry = new TarArchiveEntry(source.getName());
            entry.setSize(source.length());
            tos.putArchiveEntry(entry);

            FileInputStream fis = new FileInputStream(source);
            byte[] buffer = new byte[4096];
            int count;
            while ((count = fis.read(buffer)) != -1) {
                tos.write(buffer, 0, count);
            }
            fis.close();
            tos.closeArchiveEntry();
        }
    }
}

## 解压文件

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.ArchiveInputStream;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;

public class FileExtractor {

    public static void extract(File source, File destination) throws Exception {
        try (FileInputStream fis = new FileInputStream(source);
             GzipCompressorInputStream gzis = new GzipCompressorInputStream(fis);
             ArchiveInputStream ais = new TarArchiveInputStream(gzis)) {

            ArchiveEntry entry;
            while ((entry = ais.getNextEntry()) != null) {
                if (!ais.canReadEntryData(entry)) {
                    continue;
                }
                File file = new File(destination, entry.getName());
                if (entry.isDirectory()) {
                    file.mkdirs();
                } else {
                    FileOutputStream fos = new FileOutputStream(file);
                    byte[] buffer = new byte[4096];
                    int count;
                    while ((count = ais.read(buffer)) != -1) {
                        fos.write(buffer, 0, count);
                    }
                    fos.close();
                }
            }
        }
    }
}

以上是使用 Apache Commons Compress 实现文件压缩与解压的示例代码，你可以根据自己的需求进行修改。