Java SE: How to Decompress File (.zip)

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

import org.apache.log4j.Logger;

public class FileDeCompressUtil
{
    private static final Logger logger = Logger
            .getLogger(FileDeCompressUtil.class);

    private static final int BUFFER_SIZE = 2048;

    private FileDeCompressUtil()
    {
    }

    public static List<String> decompressFileAndDeleteOrig(File zippedFile,
            String destPath) throws IOException
    {
        List<String> decompressFileNameList = decompressFile(zippedFile,
                destPath);

        if (zippedFile.exists())
        {
            zippedFile.delete();
        }
        else
        {
            logger.error(String.format(
                    "zippedFile: [%s] doesn't exists, thus failed delete",
                    zippedFile.getName()));
        }
        return decompressFileNameList;
    }

    public static List<String> decompressFile(File zippedFile, String destPath)
            throws IOException
    {
        InputStream is = new FileInputStream(zippedFile);
        List<String> decompressFileNameList = decompressFile(is, destPath);
        is.close();

        return decompressFileNameList;
    }

    public static List<String> decompressFile(InputStream is, String destPath)
            throws IOException
    {
        List<String> decompressFileNameList = new ArrayList<String>();

        byte[] buffer = new byte[BUFFER_SIZE];
        logger.info(String.format("Start decompressFile, destPath: [%s]",
                destPath));

        File folder = new File(destPath);
        if (!folder.exists())
        {
            logger.warn(String.format(
                    "destPath: [%s] doesn't exits, thus create dir for it",
                    destPath));
            folder.mkdirs();
        }
        ZipInputStream zis = new ZipInputStream(is);

        ZipEntry ze = zis.getNextEntry();

        while (ze != null)
        {
            String fileName = ze.getName();
            String unzippedFileNameWithPath = destPath + File.separator
                    + fileName;
            File newFile = new File(unzippedFileNameWithPath);
            File parentDir = new File(newFile.getParent());

            logger.info(String.format("decompressed file: [%s]",
                    unzippedFileNameWithPath));

            decompressFileNameList.add(unzippedFileNameWithPath);

            if (!parentDir.exists())
            {
                logger.warn(String
                        .format("parentDir: [%s] doesn't exits, thus create dir for it",
                                parentDir.getAbsolutePath()));

                parentDir.mkdirs();
            }

            FileOutputStream fos = new FileOutputStream(newFile);

            int len;
            while ((len = zis.read(buffer)) > 0)
            {
                fos.write(buffer, 0, len);
            }

            fos.close();
            ze = zis.getNextEntry();
        }

        zis.closeEntry();
        zis.close();

        logger.info(String.format(
                "Finished decompressFile. decompressFileNameList: [%s]",
                decompressFileNameList));

        return decompressFileNameList;
    }
}

 

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.List;

import org.junit.Test;

public class FileDeCompressUtilTest
{
    @Test
    public void decompressFileTest() throws FileNotFoundException, IOException
    {
        File file = new File("src/test/resources/test.zip");

        String destPath = "src/test/resources";

        List<String> decompressFileNameList = FileDeCompressUtil
                .decompressFileAndDeleteOrig(file, destPath);

        for (String decompressFileName : decompressFileNameList)
        {
            new File(decompressFileName).delete();
        }
    }
}

 

 

Reference Links:

1) http://www.mkyong.com/java/how-to-decompress-files-from-a-zip-file/

评论

3 楼 DavyJones2010 2014-07-15  

knightdf 写道

freezingsky 写道

这年头代码和内容都是copy来copy去的，至少讲一讲过程分析或者是原理实现吧。

哈哈,就是啊,一个压缩解压缩的代码..只丢个代码在上面,估计久了他自己也忘了

The intent of this article is just introducing the usage of zip/unzip AIP in java.util.zip package, and it acts as a personal code base for handy future usage. If you guys are interested in each step in detail, please refer to "http://www.oracle.com/technetwork/articles/java/compress-1565076.html". Sorry for any inconvenience.

2 楼 knightdf 2014-07-12  

freezingsky 写道

这年头代码和内容都是copy来copy去的，至少讲一讲过程分析或者是原理实现吧。

哈哈,就是啊,一个压缩解压缩的代码..只丢个代码在上面,估计久了他自己也忘了

1 楼 freezingsky 2014-07-11  

这年头代码和内容都是copy来copy去的，至少讲一讲过程分析或者是原理实现吧。