Question

我正在尝试将一些文件添加到ZIP文件中，它会创建文件，但不会向其中添加任何内容。代码1：

String fulldate = year + "-" + month + "-" + day + "-" + min;

File dateFolder = new File("F:\\" + compname + "\\" + fulldate);
dateFolder.mkdir();

String zipName = "F:\\" + compname + "\\" + fulldate + "\\" + fulldate + ".zip";

zipFolder(tobackup, zipName);

我的功能：

public static void zipFolder(File folder, String name) throws Exception {
    byte[] buffer = new byte[18024];

    ZipOutputStream out = new ZipOutputStream(new FileOutputStream(name));
    FileInputStream in = new FileInputStream(folder);

    out.putNextEntry(new ZipEntry(name));

    int len;

    while((len = in.read(buffer)) > 0) {
        out.write(buffer, 0, len);
    }

    out.closeEntry();
    in.close();
    out.close();
}

编辑：我发现了问题，只是在将文件从C：\驱动器写入F：\驱动器中的ZIP时遇到问题

Answer 1

你不能压缩文件夹，只能压缩文件。要压缩文件夹，您必须手动添加所有子文件。我写了这个完成这项工作的课程。你可以免费获得它：）

用法如下：

List<File> sources = new ArrayList<File>();
sources.add(tobackup);
Packager.packZip(new File(zipName), sources);

这是班级：

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

public class Packager
{
    public static void packZip(File output, List<File> sources) throws IOException
    {
        System.out.println("Packaging to " + output.getName());
        ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(output));
        zipOut.setLevel(Deflater.DEFAULT_COMPRESSION);

        for (File source : sources)
        {
            if (source.isDirectory())
            {
                zipDir(zipOut, "", source);
            } else
            {
                zipFile(zipOut, "", source);
            }
        }
        zipOut.flush();
        zipOut.close();
        System.out.println("Done");
    }

    private static String buildPath(String path, String file)
    {
        if (path == null || path.isEmpty())
        {
            return file;
        } else
        {
            return path + "/" + file;
        }
    }

    private static void zipDir(ZipOutputStream zos, String path, File dir) throws IOException
    {
        if (!dir.canRead())
        {
            System.out.println("Cannot read " + dir.getCanonicalPath() + " (maybe because of permissions)");
            return;
        }

        File[] files = dir.listFiles();
        path = buildPath(path, dir.getName());
        System.out.println("Adding Directory " + path);

        for (File source : files)
        {
            if (source.isDirectory())
            {
                zipDir(zos, path, source);
            } else
            {
                zipFile(zos, path, source);
            }
        }

        System.out.println("Leaving Directory " + path);
    }

    private static void zipFile(ZipOutputStream zos, String path, File file) throws IOException
    {
        if (!file.canRead())
        {
            System.out.println("Cannot read " + file.getCanonicalPath() + " (maybe because of permissions)");
            return;
        }

        System.out.println("Compressing " + file.getName());
        zos.putNextEntry(new ZipEntry(buildPath(path, file.getName())));

        FileInputStream fis = new FileInputStream(file);

        byte[] buffer = new byte[4092];
        int byteCount = 0;
        while ((byteCount = fis.read(buffer)) != -1)
        {
            zos.write(buffer, 0, byteCount);
            System.out.print('.');
            System.out.flush();
        }
        System.out.println();

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

享受！

编辑：要检查程序是否仍然忙，您可以添加我用（*）

标记的三行

编辑2 ：尝试使用新代码。在我的平台上，它运行正常（OS X）。我不确定但是，AppData中的Windows文件可能存在一些有限的读取权限。

Answer 2

另见ZeroTurnaround's Zip library。它具有（引用）等功能：

递归打包和解压缩目录
遍历ZIP条目

Answer 3

我将使用 Java 7 NIO FileSystem 添加另一种方法。它使用 JAR 文件实际上是 ZIP 的事实：

static public void addToZip(Path zip, Path file) throws IOException {
    Map<String,String> env = new HashMap<>();
    env.put("create", "false"); // We don't create the file but modify it
    
    URI uri = URI.create("jar:file:"+zip.toString());
    try (FileSystem zipfs = FileSystems.newFileSystem(uri, env)) {
        Path f = zipfs.getPath(file.getFileName().toString());
        Files.copy(file, f, StandardCopyOption.REPLACE_EXISTING);
    }
}

将文件添加到ZIP文件

3 个答案: