Java实现rar解压

jar包下载地址

https://mvnrepository.com/artifact/com.github.junrar/junrar

UnRarUtils.java

import com.github.junrar.Archive;

import com.github.junrar.UnrarCallback;

import com.github.junrar.exception.RarException;

import com.github.junrar.rarfile.FileHeader;

 

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.math.BigInteger;

import java.security.MessageDigest;

import java.util.List;

 

public class UnRarUtils {

 

    /**

     * @param rarFileName rar file name

     * @param outFilePath output file path

     * @param callback callback

     * @author shijian

     * @throws Exception

     */

    public static void unrar(String rarFileName, String outFilePath, UnrarCallback callback) throws Exception {

        Archive archive = new Archive(new File(rarFileName), callback);

        if(archive == null){

            throw new FileNotFoundException(rarFileName + " NOT FOUND!");

        }

        if(archive.isEncrypted()){

            throw new Exception(rarFileName + " IS ENCRYPTED!");

        }

        List<FileHeader> files =  archive.getFileHeaders();

        for (FileHeader fh : files) {

            if(fh.isEncrypted()){

                throw new Exception(rarFileName + " IS ENCRYPTED!");

            }

            String fileName = fh.getFileNameString();

            if(fileName != null && fileName.trim().length() > 0){

                String saveFileName = outFilePath+ File.separator+fileName;

                File saveFile = new File(saveFileName);

                File parent =  saveFile.getParentFile();

                if(!parent.exists()){

                    parent.mkdirs();

                }

                if(!saveFile.exists()){

                    saveFile.createNewFile();

                }

                FileOutputStream fos = new FileOutputStream(saveFile);

                try {

                    archive.extractFile(fh, fos);

                } catch (RarException e) {

                    throw e;

                }finally{

                    try{

                        fos.flush();

                        fos.close();

                    }catch (Exception e){

                    }

                }

            }

        }

    }

 

    /**

     * 获取单个文件的MD5值！

     * @param file

     * @return

     */

    public static String getFileMD5(File file) {

        if (!file.isFile()) {

            return null;

        }

        MessageDigest digest = null;

        FileInputStream in = null;

        byte buffer[] = new byte[1024];

        int len;

        try {

            digest = MessageDigest.getInstance("MD5");

            in = new FileInputStream(file);

            while ((len = in.read(buffer, 0, 1024)) != -1) {

                digest.update(buffer, 0, len);

            }

            in.close();

        } catch (Exception e) {

            e.printStackTrace();

            return null;

        }

        BigInteger bigInt = new BigInteger(1, digest.digest());

        return bigInt.toString(16);

    }

}

　　

使用

UnRarUtils.unrar(rarFile.getAbsolutePath(), sdDir.getAbsolutePath(), new UnrarCallback() {

        int currentProgress = -1;

        @Override

        public boolean isNextVolumeReady(Volume volume) {

            return true;

        }

        @Override

        public void volumeProgressChanged(long l, long l1) {

            int progress = (int)((double)l/l1*100);

            if(currentProgress != progress){

                currentProgress = progress;

                LogUtils.addLog(context,TAG,"Unrar "+rarFile.getName()+" rate: "+progress+"%");

            }

        }

    });