Java利用Apache compress包实现文件夹压缩成Zip包

Apache common提供了很多实用的工具包，下面就说一下如何用compress包来压缩文件夹。先引入compress，io和lang3这3个工具包：

 <dependencies>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-compress</artifactId>
            <version>1.9</version>
        </dependency>

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.8</version>
        </dependency>
    </dependencies>

这个方法实现了将文件夹下所有的文件压缩成zip包，并输出到文件流中，可以直接写入到文件或提供给前端下载，工具类如下：

import org.apache.commons.compress.archivers.ArchiveException;
import org.apache.commons.compress.archivers.ArchiveStreamFactory;
import org.apache.commons.compress.archivers.zip.Zip64Mode;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.filefilter.TrueFileFilter;
import org.apache.commons.lang3.StringUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collection;

public class ZipUtils {

    /**
     * 压缩文件夹下的所有文件
     * @param dir          要压缩的文件夹
     * @param outputStream 输出压缩后的文件流
     * @throws IOException      IO异常
     * @throws ArchiveException 压缩异常
     */
    public static void zip(File dir, OutputStream outputStream) throws IOException, ArchiveException {
        ZipArchiveOutputStream zipOutput = null;
        try {
            zipOutput = (ZipArchiveOutputStream) new ArchiveStreamFactory()
                    .createArchiveOutputStream(ArchiveStreamFactory.ZIP, outputStream);
            zipOutput.setEncoding("utf-8");
            zipOutput.setUseZip64(Zip64Mode.AsNeeded);
            Collection<File> files = FileUtils.listFilesAndDirs(dir, TrueFileFilter.INSTANCE, TrueFileFilter.INSTANCE);

            for (File file : files) {
                InputStream in = null;
                try {
                    if (file.getPath().equals(dir.getPath())) {
                        continue;
                    }
                    String relativePath = StringUtils.replace(file.getPath(), dir.getPath() + File.separator, "");
                    ZipArchiveEntry entry = new ZipArchiveEntry(file, relativePath);
                    zipOutput.putArchiveEntry(entry);
                    if (file.isDirectory()) {
                        zipOutput.closeArchiveEntry();
                        continue;
                    }

                    in = new FileInputStream(file);
                    IOUtils.copy(in, zipOutput);
                    zipOutput.closeArchiveEntry();
                } finally {
                    if (in != null) {
                        IOUtils.closeQuietly(in);
                    }
                }
            }
            zipOutput.finish();
        } finally {
            IOUtils.closeQuietly(zipOutput);
        }
    }

    public static void main(String args[]) throws IOException, ArchiveException {
        //要压缩的文件路径
        File dir = new File("C:\\data\\data");
        //压缩后zip包文件路径
        File dest = new File("C:\\data\\test.zip");
        OutputStream outputStream = new FileOutputStream(dest);
        zip(dir, outputStream);
    }
}

执行main函数跑测试用例，发现程序将dir路径下的所有文件已经压缩并输出zip包。