Example code for extracting a whole 7zip archive to disk

[stefan-reich]

Hi, maybe I just didn't see it - is there a simple example for how to extract a whole archive into a directory? All the callbacks I apparently have to implement look a bit complicated. Also I want to avoid calling extractSlow which, I'm guessing, is expanding streams multiple times needlessly to find just the one requested file.

Thanks in advance

[BTYHunter]

This demo works well.

package demo;

import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;

import net.sf.sevenzipjbinding.*;
import net.sf.sevenzipjbinding.impl.RandomAccessFileInStream;
import net.sf.sevenzipjbinding.simple.ISimpleInArchive;
import net.sf.sevenzipjbinding.simple.ISimpleInArchiveItem;

public class ExtractItemsSimpleDemo {
    public static void main(String[] args) {
        String testPath = "your/path/";
        RandomAccessFile randomAccessFile = null;
        IInArchive inArchive = null;
        try {
            randomAccessFile = new RandomAccessFile("your/file", "r");
            inArchive = SevenZip.openInArchive(null, // autodetect archive type
                    new RandomAccessFileInStream(randomAccessFile));

            // Getting simple interface of the archive inArchive
            ISimpleInArchive simpleInArchive = inArchive.getSimpleInterface();

            System.out.println("   Hash   |    Size    | Filename");
            System.out.println("----------+------------+---------");

            for (ISimpleInArchiveItem item : simpleInArchive.getArchiveItems()) {
                final int[] hash = new int[] { 0 };
                if (!item.isFolder()) {

                    String extractedObject = testPath + item.getPath();

                    Path pathToExtractedObject = Paths.get(extractedObject);
                    System.out.println("pathToExtractedObject is: " + pathToExtractedObject);
                    Files.createDirectories(pathToExtractedObject.getParent());

                    FileOutputStream fos = new FileOutputStream(extractedObject);

                    ExtractOperationResult result;

                    final long[] sizeArray = new long[1];
                    result = item.extractSlow(new ISequentialOutStream() {
                        public int write(byte[] data) throws SevenZipException {
                            hash[0] ^= Arrays.hashCode(data); // Consume data
                            sizeArray[0] += data.length;
                            try {
                                System.err.println("item: "  + item.getPath() +", date length: " + data.length);
                                fos.write(data,0,data.length);

                            } catch (Exception e) {
                                System.err.println("Error: " + e);
                            }
                            return data.length; // Return amount of consumed data
                        }
                    });
                    fos.close();

                    if (result == ExtractOperationResult.OK) {
                        System.out.println(String.format("%9X | %10s | %s",
                                hash[0], sizeArray[0], item.getPath()));
                    } else {
                        System.err.println("Error extracting item: " + result);
                    }
                }
            }
        } catch (Exception e) {
            System.err.println("Error occurs: " + e);
        } finally {
            if (inArchive != null) {
                try {
                    inArchive.close();
                } catch (SevenZipException e) {
                    System.err.println("Error closing archive: " + e);
                }
            }
            if (randomAccessFile != null) {
                try {
                    randomAccessFile.close();
                } catch (IOException e) {
                    System.err.println("Error closing file: " + e);
                }
            }
        }
    }
}