Java UnZip程序

Question

我有一个具有以下结构的zip文件：

MyZip.zip
|-- FOLDER_1
|   `-- FOLDER_11
|       |-- file_a
|       `-- file_b
|-- FOLDER_2
|   `-- FOLDER_22
|       `-- file_c
`-- FOLDER_3
    `-- FOLDER_33
        `-- file_d

我尝试过使用这个示例，但是它不适用于我的压缩结构。为了使这个类正确地解压缩我的压缩文件，我需要做什么？它将创建C:\outputzip\FOLDER1\FOLDER_11，其中FOLDER_11不是一个文件夹，但是一个文件调用了FOLDER_11，然后程序就中断了。

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

public class UnZip {
    List<String> fileList;
    private static final String INPUT_ZIP_FILE = "C:\\MyFile.zip";
    private static final String OUTPUT_FOLDER = "C:\\outputzip";

    public static void main( String[] args )
    {
        UnZip unZip = new UnZip();
        unZip.unZipIt(INPUT_ZIP_FILE,OUTPUT_FOLDER);
    }

    /**
    * Unzip it
    * @param zipFile input zip file
    * @param output zip file output folder
    */
    public void unZipIt(String zipFile, String outputFolder){
        byte[] buffer = new byte[1024];

        try{
            //create output directory is not exists
            File folder = new File(OUTPUT_FOLDER);
            if(!folder.exists()){
                folder.mkdir();
            }

            //get the zip file content
            ZipInputStream zis = 
            new ZipInputStream(new FileInputStream(zipFile));
            //get the zipped file list entry
            ZipEntry ze = zis.getNextEntry();

            while(ze!=null){
                String fileName = ze.getName();
                File newFile = new File(outputFolder + File.separator + fileName);

                System.out.println("file unzip : "+ newFile.getAbsoluteFile());

                //create all non exists folders
                //else you will hit FileNotFoundException for compressed folder
                new File(newFile.getParent()).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();

            System.out.println("Done");
        } catch(IOException ex){
            ex.printStackTrace(); 
        }
    }    
}

Answer 1

如果您有一些问题，请将while()循环更改为下面的循环，并在其中游玩：

        while (ze != null) {

            String fileName = ze.getName();
            File newFile = new File(outputFolder + File.separator
                    + fileName);

            if (ze.isDirectory()) {
                File directory = new File(newFile.getPath());
                directory.mkdirs();
                ze = zis.getNextEntry();
                continue;
            }

            System.out.println("file unzip : " + newFile.getAbsoluteFile());

            FileOutputStream fos = new FileOutputStream(newFile);

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

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