Java代码对rar文件的解压缩，目前网上对于rar5压缩文件解压缩代码很少，在工作中因为要对rar5进行解压，将自己晕倒的坑记录下来。

使用的jar 是unrar

 <!-- 压缩文件jar -->
        <dependency>
            <groupId>com.github.axet</groupId>
            <artifactId>java-unrar</artifactId>
            <version>1.7.0-8</version>
        </dependency>
        <dependency>
            <groupId>net.sf.sevenzipjbinding</groupId>
            <artifactId>sevenzipjbinding</artifactId>
            <version>16.02-2.01</version>
        </dependency>
        <dependency>
            <groupId>net.sf.sevenzipjbinding</groupId>
            <artifactId>sevenzipjbinding-all-platforms</artifactId>
            <version>16.02-2.01</version>
        </dependency>

基础解压代码

public static void uncompressAllFile(File newFile, String targetFilePath) throws Exception {
        RandomAccessFile randomAccessFile = null;
        IInArchive inArchive = null;
        // 第一个参数是需要解压的压缩包路径，第二个参数参考JdkAPI文档的RandomAccessFile
        randomAccessFile = new RandomAccessFile(newFile.getPath(), "r");
        inArchive = SevenZip.openInArchive(null, new RandomAccessFileInStream(randomAccessFile));
        int[] in = new int[inArchive.getNumberOfItems()];
        for (int i = 0; i < in.length; i++) {
            in[i] = i;
        }
//        inArchive.extract(in, true, new ExtractZipFileCallback(inArchive, targetFilePath));
        inArchive.extract(in, false, new ExtractCallback(inArchive,targetFilePath));
        System.out.println("=======================");
    }

执行

    public static void main(String[] args) throws Exception {
        
        File f=new File("d:/file/aa.rar");
        String  targerFile="d:/file/newfile/";
        uncompressAllFile(f,targerFile);
    }

该代码可以使用rar 4 和rar5 的版本，但是在解压过程中会将压缩包中的空文件夹过滤掉

优化版
使用回调函数 将过滤掉的空文件夹重新创建

public class ExtractCallback implements IArchiveExtractCallback {


    private int index;
    private IInArchive inArchive;
    private String ourDir;

    public ExtractCallback(IInArchive inArchive, String ourDir) {
        this.inArchive = inArchive;
        this.ourDir = ourDir;
    }


    @Override
    public void setCompleted(long arg0) throws SevenZipException {
    }

    @Override
    public void setTotal(long arg0) throws SevenZipException {
    }

    @Override
    public ISequentialOutStream getStream(int index, ExtractAskMode extractAskMode) throws SevenZipException {
        this.index = index;
        final String path = (String) inArchive.getProperty(index, PropID.PATH);
        final boolean isFolder = (boolean) inArchive.getProperty(index, PropID.IS_FOLDER);

        File file1 = new File(ourDir + File.separator+ path);
        File parentFile;
        if (!file1.exists() && isFolder) {
            if (!(parentFile = file1.getParentFile()).exists()) {
                parentFile.mkdirs();
            }
            if (!file1.isFile()) {
                file1.mkdir();
            }
        }
        return data -> {
            try {
                if (!isFolder) {
                    File file = new File(ourDir + path);
                    save2File(file1, data);
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
            return data.length;
        };
    }

    @Override
    public void prepareOperation(ExtractAskMode arg0) throws SevenZipException {
    }

    @Override
    public void setOperationResult(ExtractOperationResult extractOperationResult) throws SevenZipException {

    }

    public static boolean save2File(File file, byte[] msg) throws FileNotFoundException {
        OutputStream fos = null;
        try {
            File parent = file.getParentFile();
            if ((!parent.exists()) && (!parent.mkdirs())) {
                return false;
            }
            fos = new FileOutputStream(file, true);
            fos.write(msg);
            fos.flush();
            return true;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return false;
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        } finally {
            try {
                fos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}

调用

    public static void uncompressAllFile(File newFile, String targetFilePath) throws Exception {
        RandomAccessFile randomAccessFile = null;
        IInArchive inArchive = null;
        // 第一个参数是需要解压的压缩包路径，第二个参数参考JdkAPI文档的RandomAccessFile
        randomAccessFile = new RandomAccessFile(newFile.getPath(), "r");
        inArchive = SevenZip.openInArchive(null, new RandomAccessFileInStream(randomAccessFile));
        int[] in = new int[inArchive.getNumberOfItems()];
        for (int i = 0; i < in.length; i++) {
            in[i] = i;
        }
//        inArchive.extract(in, true, new ExtractZipFileCallback(inArchive, targetFilePath));
        //使用回调函数
        inArchive.extract(in, false, new ExtractCallback(inArchive,targetFilePath));
        System.out.println("=======================");
    }

以上是本人在操作中遇到的问题，如有不足请大家一起指出来