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Java解壓rar文件的兩種實現(xiàn)方法

更新時間：2024年06月17日 09:00:23 作者：香蕉加奶茶

這篇文章主要介紹了Java解壓rar文件的兩種實現(xiàn)方法,具有很好的參考價值,希望對大家有所幫助,如有錯誤或未考慮完全的地方,望不吝賜教

Java解壓rar文件的兩種方法

方法一

 private static void extractRar(String rarPath, String destDir) throws IOException, RarException {
        File dstDiretory = new File(destDir);
        if (!dstDiretory.exists()) {
            dstDiretory.mkdirs();
        }

        File rarFile = new File(rarPath);
        Archive archive = new Archive(new FileInputStream(rarFile));
        List<FileHeader> fileHeaders = archive.getFileHeaders();
        for (FileHeader fileHeader : fileHeaders) {
            if (fileHeader.isDirectory()) {
                String fileName = fileHeader.getFileNameW();
                if (!existZH(fileName)) {
                    fileName = fileHeader.getFileNameString();
                }
                File dir = new File(destDir + File.separator + fileName);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
            } else {
                String fileName = fileHeader.getFileNameW().trim();
                if (!existZH(fileName)) {
                    fileName = fileHeader.getFileNameString().trim();
                }
                File file = new File(destDir + File.separator + fileName);
                try {
                    if (!file.exists()) {
                        if (!file.getParentFile().exists()) {
                            file.getParentFile().mkdirs();
                        }
                        file.createNewFile();
                    }
                    FileOutputStream os = new FileOutputStream(file);
                    archive.extractFile(fileHeader, os);
                    os.close();
                } catch (Exception ex) {
                    throw ex;
                }
            }
        }
        archive.close();

    }

    //判斷文件名有沒有正則表達(dá)式
    public static boolean existZH(String str) {
        String regEx = "[\\u4e00-\\u9fa5]";
        Pattern p = Pattern.compile(regEx);
        Matcher m = p.matcher(str);
        while (m.find()) {
            return true;
        }
        return false;
    }

<groupId>com.github.junrar</groupId>
<artifactId>junrar</artifactId>

方法二

 /**
     * 采用命令行方式解壓文件
     *
     * @param rarPath 壓縮文件路徑
     * @param destDir 解壓結(jié)果路徑
     * @param cmdPath WinRAR.exe的路徑，也可以在代碼中寫死
     * @return
     */
    public static boolean realExtract(String rarPath, String destDir, String cmdPath) {
        File rarFile = new File(rarPath);
        // 解決路徑中存在/..格式的路徑問題
        destDir = new File(destDir).getAbsoluteFile().getAbsolutePath();
        while (destDir.contains("..")) {
            String[] sepList = destDir.split("\\\\");
            destDir = "";
            for (int i = 0; i < sepList.length; i++) {
                if (!"..".equals(sepList[i]) && i < sepList.length - 1 && "..".equals(sepList[i + 1])) {
                    i++;
                } else {
                    destDir += sepList[i] + File.separator;
                }
            }
        }
        boolean bool = false;
        if (!rarFile.exists()) {
            return false;
        }
        // 開始調(diào)用命令行解壓，參數(shù)-o+是表示覆蓋的意思
        String cmd = cmdPath + " X -o+ " + rarFile + " " + destDir;
        System.out.println(cmd);
        try {
            Process proc = Runtime.getRuntime().exec(cmd);
            if (proc.waitFor() != 0) {
                if (proc.exitValue() == 0) {
                    bool = false;
                }
            } else {
                bool = true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        rarFile.delete();
        return bool;
    }

Java解壓 rar、zip、7z 等壓縮包通用工具類

問題

項目中有一個需求，客戶端上傳壓縮包到服務(wù)器，需要先解壓壓縮包，拿到文件后進(jìn)一步業(yè)務(wù)處理（保存圖片，導(dǎo)入excel表格中的數(shù)據(jù)等等）。

上傳的壓縮包有多種格式，可能是 rar 或者 zip，Java 自帶的工具類只能解壓 zip，rar 需要額外導(dǎo)入其他依賴來解壓。

記錄下當(dāng)時項目中用來解壓 rar 的代碼，該工具類也可以解壓 zip 7z 等壓縮包。

代碼

pom

        <dependency>
            <groupId>net.sf.sevenzipjbinding</groupId>
            <artifactId>sevenzipjbinding-all-platforms</artifactId>
            <version>16.02-2.01</version>
        </dependency>
        <dependency>
            <groupId>net.sf.sevenzipjbinding</groupId>
            <artifactId>sevenzipjbinding</artifactId>
            <version>16.02-2.01</version>
        </dependency>

解壓工具類

public class UnCompressUtil {
    private static final Logger logger = Logger.getLogger(UnCompressUtil.class.getCanonicalName());

    /**
     * 解壓rar
     *
     * @param file rar
     * @param extractPath 解壓路徑
     */
    public static void unCompress(File file, String extractPath) {
        try{
            RandomAccessFile randomAccessFile = new RandomAccessFile(file.getAbsolutePath(), "r");
            IInArchive archive = SevenZip.openInArchive(null,  new RandomAccessFileInStream(randomAccessFile));
            // 解壓?件路徑
            File extractDir = new File(extractPath);
            if (!extractDir.isDirectory()) {
                extractDir.mkdir();
            }
            int[] in = new int[archive.getNumberOfItems()];
            for(int i=0;i<in.length;i++){
                in[i] = i;
            }
            archive.extract(in, false, new ExtractCallback(archive, extractDir.getAbsolutePath()));
            archive.close();
            randomAccessFile.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static class ExtractCallback implements IArchiveExtractCallback {
        private final IInArchive inArchive;

        private final String extractPath;

        public ExtractCallback(IInArchive inArchive, String extractPath) {
            this.inArchive = inArchive;
            if (!extractPath.endsWith("/") && !extractPath.endsWith("\\")) {
                extractPath += File.separator;
            }
            this.extractPath = extractPath;
        }

        @Override
        public void setTotal(long total) {

        }

        @Override
        public void setCompleted(long complete) {

        }

        @Override
        public ISequentialOutStream getStream(int index, ExtractAskMode extractAskMode) throws SevenZipException {
            return data -> {
                String filePath = inArchive.getStringProperty(index, PropID.PATH);
                FileOutputStream fos = null;
                try {
                    File path = new File(extractPath + filePath);

                    if(!path.getParentFile().exists()){
                        path.getParentFile().mkdirs();
                    }

                    if(!path.exists()){
                        path.createNewFile();
                    }
                    fos = new FileOutputStream(path, true);
                    fos.write(data);
                } catch (IOException e) {
                    logger.log(null, "IOException while extracting " + filePath);
                } finally{
                    try {
                        if(fos != null){
                            fos.flush();
                            fos.close();
                        }
                    } catch (IOException e) {
                        logger.log(null, "Could not close FileOutputStream", e);
                    }
                }
                return data.length;
            };
        }

        @Override
        public void prepareOperation(ExtractAskMode extractAskMode) {

        }

        @Override
        public void setOperationResult(ExtractOperationResult extractOperationResult) {
        }

    }
}

測試類

class UnCompressUtilTest {

    @Test
    void unCompress() {
        String rarPath = "C:\\Users\\XXX\\Desktop\\test.rar";
        File file = new File(rarPath);
        String extractPath = "C:\\Users\\XXX\\Desktop";
        UnCompressUtil.unCompress(file, extractPath);
    }
}