如何使用Apache MINA SSHD阻止SFTP删除操作

import org.apache.sshd.server.subsystem.sftp.SftpSubsystem;
import org.apache.sshd.server.subsystem.sftp.SftpSubsystemFactory;

public class CustomSftpSubsystemFactory extends SftpSubsystemFactory {
    @Override
    protected SftpSubsystem createSubsystem() {
        return new CustomSftpSubsystem();
    }
}

public class CustomSftpSubsystem extends SftpSubsystem {
    @Override
    public boolean remove(Path file) throws IOException {
        // 阻止删除操作的逻辑
        return false;
    }
}

import org.apache.sshd.SshServer;

public class SSHServerExample {
    public static void main(String[] args) throws IOException {
        SshServer sshServer = SshServer.setUpDefaultServer();
        sshServer.setSubsystemFactories(Collections.singletonList(new CustomSftpSubsystemFactory()));
        // 其他配置...

        sshServer.start();
    }
}