ZipOutputStream不会为目录创建新条目

Question

我试图在. zip文件中创建目录，但只有一个目录是在. zip中创建的。我不知道为什么只有第一个目录被创建。zip（）方法每次都被调用。

列出文件的方法：

private Set<String> listFiles(String path){

        File f = new File(path);
        Set<String> files = new HashSet<>();

        for(File file : Objects.requireNonNull(f.listFiles())){
            files.add(file.getPath());
        }
        return files;
    }

要压缩的方法：

 private void zip(Set<String> path){
        try {
            BufferedInputStream bufferedInputStream = null;
            BufferedOutputStream bufferedOutputStream;
            ZipOutputStream zipOutputStream;

            File f;

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {

                bufferedOutputStream = new BufferedOutputStream(new FileOutputStream("/sdcard/Android/data/com.kpwnapps.pmmpplugins/files/PocketMine-MP/test.zip"));
                zipOutputStream= new ZipOutputStream(bufferedOutputStream, StandardCharsets.UTF_8);

                for (String file : path){

                    f = new File(file);

                    if (f.isDirectory()){
                        zipOutputStream.putNextEntry(new ZipEntry(f.getName() + "/"));
                        zip(listFiles(f.getPath()));
                    }else {
                      
                        bufferedInputStream = new BufferedInputStream(new FileInputStream(file));
                        zipOutputStream.putNextEntry(new ZipEntry(f.getName()));
                        IOUtils.copy(bufferedInputStream, zipOutputStream);
                        zipOutputStream.closeEntry();
                    }
                     */

                }

                if (bufferedInputStream != null){
                    bufferedInputStream.close();
                }

                zipOutputStream.flush();
                zipOutputStream.close();

            }
        }catch (Exception ignored){
        }

    }

Answer 1

我有点惊讶这竟然有用。

当您的zip（）方法递归调用自身时，它会创建一个新的FileOutputStream，其文件名与前一次调用相同。这意味着您的递归调用将在彼此之上写入，而不是附加到单个zip文件。

您应该只打开FileOutputStream/ZipOutputStream一次，然后使用它压缩所有文件和目录。

这意味着重写一些代码，以便在压缩的第一级创建zipoutpstream，然后调用内部方法zip（path，zipoutpstream）。递归调用还必须调用这个zip（path，zipoutpstream）方法。

这看起来像

private void zip(Set<String> path) {
    // create FileOutputStream, ZipOutputStream
    ZipOutputStream zipOutputStream = new ZipOutputStream(fileOutputStream);
    // call worker method
    zip(path, zipOutputStream);
    // close output stream
    zipOutputStream.flush();
    zipOutputStream.close();
}

private void zip(Set<String> path, ZipOutputStream zipOutputStream) {
    // loop over paths
        if (f.isDirectory()) {
            zipOutputStream.putNextEntry(new ZipEntry(f.getName() + "/"));
            zip(listFiles(f.getPath()), zipOutputStream);
        }
    // end of loop over paths
}

Answer 2

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

public class ZipFolders
{
    public static void main(String[] args) throws IOException
    {    
        List<String> listOfDir = new ArrayList<String>();

        String dirpath1 = "/home/administrator/Documents/ZipTest/folder1";
        String dirpath2 = "/home/administrator/Documents/ZipTest/folder2";

        String ZipName = "/home/administrator/Documents/ZipTest/output.zip";
        listOfDir.add(dirpath1);
        listOfDir.add(dirpath2);

        ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(ZipName));
        zipDirectories(listOfDir,zos); 
        zos.close(); 
        System.out.println("Zip Created Successfully");
    }

    private static void zipDirectories(List<String> listOfDir, ZipOutputStream zos) {
        for(String dirPath:listOfDir){
            try {
                zipdirectory(dirPath, zos);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    public static void zipdirectory(String dirpath, ZipOutputStream zos) throws IOException
    {
        File f = new File(dirpath);
        String[] flist = f.list();
        for(int i=0; i<flist.length; i++)
        {
            File ff = new File(f,flist[i]);
            if(ff.isDirectory())
            {
                zipdirectory(ff.getPath(),zos);    
                continue;
            }
            String fileName = ff.getPath().substring(ff.getPath().lastIndexOf('/'));

            String folder = dirpath.substring(dirpath.lastIndexOf('/')+1);

            ZipEntry entries = new ZipEntry(folder+fileName);
            zos.putNextEntry(entries);
            FileInputStream fis = new FileInputStream(ff);
            int buffersize = 1024;
            byte[] buffer = new byte[buffersize];
            int count;
            while((count = fis.read(buffer)) != -1)
            {
                zos.write(buffer,0,count);    
            }
            fis.close();
        }
    }
}