zip压缩包

<dependency>
    <groupId>net.lingala.zip4j</groupId>
    <artifactId>zip4j</artifactId>
    <version>1.3.2</version>
</dependency>

public static void main(String[] args) {
    try {
        ZipFile file = new ZipFile(new File(""));
        System.out.println(file.isEncrypted());
    } catch (ZipException e) {
        e.printStackTrace();
    }
}

rar压缩包

使用sevenzip判断是否加密。
参考https://stackoverflow.com/questions/27543357/how-do-i-detect-if-the-7zip-file-is-password-protected

<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>

try(RandomAccessFile randomAccessFile = new RandomAccessFile(rarDir, "r");
     IInArchive archive = SevenZip.openInArchive(null,new RandomAccessFileInStream(randomAccessFile))){
    if (Boolean.TRUE.equals(archive.getArchiveProperty(PropID.ENCRYPTED))) {
        System.out.println("加密");
        return true;
    }
    for (int i=0;i<archive.getNumberOfItems();i++) {
        if (Boolean.TRUE.equals(archive.getProperty(i,PropID.ENCRYPTED))) {
            System.out.println("加密");
            return true;
        }
    }
    System.out.println("没加密");
    int[] in = new int[archive.getNumberOfItems()];
    for (int i = 0; i < in.length; i++) {
        in[i] = i;
    }
    archive.extract(in, false, new ExtractCallback(archive,outDir + "/"));

}catch (Exception e){
    result = false;
    LogUtil.error(RarUtil.class,"rar文件解压缩失败，原因：{}",e);
}