我应该如何在java中提取压缩文件夹？

Question

我使用以下代码来提取Java中的zip文件.

import java.io.*;
import java.util.zip.*;

class  testZipFiles 
{
    public static void main(String[] args) 
    {

        try
        {
            String filename = "C:\\zip\\includes.zip";
            testZipFiles list = new testZipFiles( );
            list.getZipFiles(filename);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    public void getZipFiles(String filename)
    {
        try
        {
            String destinationname = "c:\\zip\\";
            byte[] buf = new byte[1024];
            ZipInputStream zipinputstream = null;
            ZipEntry zipentry;
            zipinputstream = new ZipInputStream(
            new FileInputStream(filename));

            zipentry = zipinputstream.getNextEntry();
            while (zipentry != null) 
            { 
                //for each entry to be extracted
                String entryName = zipentry.getName();
                System.out.println("entryname "+entryName);
                int n;
                FileOutputStream fileoutputstream;
                File newFile = new File(entryName);
                String directory = newFile.getParent();

                if(directory == null)
                {
                    if(newFile.isDirectory())
                    break;
                }

                fileoutputstream = new FileOutputStream(
                   destinationname+entryName);             

                while ((n = zipinputstream.read(buf, 0, 1024)) > -1)
                    fileoutputstream.write(buf, 0, n);

                fileoutputstream.close(); 
                zipinputstream.closeEntry();
                zipentry = zipinputstream.getNextEntry();

            }//while

            zipinputstream.close();
        }
        catch (Exception e)
       {
            e.printStackTrace();
       }
  }

}

显然,由于break语句,这不会提取文件夹树.我试图使用递归来处理文件夹树但失败了.有人可以告诉我如何改进此代码来处理文件夹树而不是压缩的单级文件夹.

Answer 1

您可以使用File.mkdirs()来创建文件夹.尝试更改您的方法,如下所示:

public static void getZipFiles(String filename) {
    try {
        String destinationname = "c:\\zip\\";
        byte[] buf = new byte[1024];
        ZipInputStream zipinputstream = null;
        ZipEntry zipentry;
        zipinputstream = new ZipInputStream(
                new FileInputStream(filename));

        zipentry = zipinputstream.getNextEntry();
        while (zipentry != null) {
            //for each entry to be extracted
            String entryName = destinationname + zipentry.getName();
            entryName = entryName.replace('/', File.separatorChar);
            entryName = entryName.replace('\\', File.separatorChar);
            System.out.println("entryname " + entryName);
            int n;
            FileOutputStream fileoutputstream;
            File newFile = new File(entryName);
            if (zipentry.isDirectory()) {
                if (!newFile.mkdirs()) {
                    break;
                }
                zipentry = zipinputstream.getNextEntry();
                continue;
            }

            fileoutputstream = new FileOutputStream(entryName);

            while ((n = zipinputstream.read(buf, 0, 1024)) > -1) {
                fileoutputstream.write(buf, 0, n);
            }

            fileoutputstream.close();
            zipinputstream.closeEntry();
            zipentry = zipinputstream.getNextEntry();

        }//while

        zipinputstream.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}