前言

最近有项目需要开发档案打包下载功能，其中包含很多大附件，项目使用minio存储且不在同一台服务器上，为了优化速度决定使用windows共享功能进行文件传输

SMB1.0

集成jcifs类库，主要适用于一些老旧系统，但下载速度比较慢，仅作参考

此类库没有maven引用，官网地址：http://jcifs.samba.org/

注意事项：

设置jcifs.smb.client.dfs.disabled选项开启，可以提高传输速度

使用NtlmPasswordAuthentication认证代替smb协议url携带用户名密码方式，避免特殊字符传递造成认证失败

 public static void downloadFile(String ip, String shareFolder, String filePath, String localDir) throws Exception {
        System.setProperty("jcifs.smb.client.dfs.disabled", "true");
        String url = getFileUrl(ip, shareFolder, filePath);
        SmbFile smbFile = new SmbFile(url);
        smbFile.connect();
        FileUtil.initfloderPath(localDir);
        String localFilePath = localDir + "/" + smbFile.getName();
        BufferedInputStream buf = new BufferedInputStream(new SmbFileInputStream(smbFile));
        FileUtil.writeFile(localFilePath, FileUtil.convertStreamToByte(buf));
    }
    public static void downloadFileByAuth(String ip, String shareFolder, String userName, String password, String filePath, String localDir) throws Exception {
        System.setProperty("jcifs.smb.client.dfs.disabled", "true");
        String url = getFileUrl(ip, shareFolder, filePath);
        NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication(ip, userName, password);
        SmbFile smbFile = new SmbFile(url, auth);
        smbFile.connect();
        FileUtil.initfloderPath(localDir);
        String localFilePath = localDir + "/" + smbFile.getName();
        BufferedInputStream buf = new BufferedInputStream(new SmbFileInputStream(smbFile));
        FileUtil.writeFile(localFilePath, FileUtil.convertStreamToByte(buf));
    }
    public static String getFileUrl(String ip, String shareFolder, String filePath) {
        return "smb://" + ip + "/" + shareFolder + "/" + filePath;
    }

SMB2.0

集成smbj类库，适用于windows server2012及以上操作系统，默认安装开启无需额外配置

此类库maven引用很久没有发布最新版本，需要下载代码自行编译，github地址：https://github.com/hierynomus/smbj

经测试，500MB文件传输大概比minio协议传输快了4秒左右，小文件传输速度基本保持一致

  public static void downloadFileV2(String ip, String shareFolder, String filePath, String localDir) throws Exception {
        SMBClient client = new SMBClient(SmbConfig.createDefaultConfig());
        Connection conn = client.connect(ip);
        Session session = conn.authenticate(AuthenticationContext.anonymous());
        downLoadSMB2(session, shareFolder, filePath, localDir);
    }
    public static void downloadFileByAuthV2(String ip, String shareFolder, String userName, String password, String filePath, String localDir) throws Exception {
        SMBClient client = new SMBClient(SmbConfig.createDefaultConfig());
        Connection conn = client.connect(ip);
        Session session = conn.authenticate(new AuthenticationContext(userName, password.toCharArray(), ip));
        downLoadSMB2(session, shareFolder, filePath, localDir);
    }
    private static void downLoadSMB2(Session session, String shareFolder, String filePath, String localDir) throws Exception {
        InputStream fis = null;
        FileOutputStream os = null;
        DiskShare diskShare = null;
        try {
            diskShare = (DiskShare) session.connectShare(shareFolder);
            if (!diskShare.fileExists(filePath)) {
                throw new FileNotFoundException(filePath);
            }
            if (!diskShare.isConnected())
                diskShare = (DiskShare) session.connectShare(shareFolder);
            com.hierynomus.smbj.share.File file = diskShare.openFile(filePath,
                    EnumSet.of(AccessMask.GENERIC_READ),
                    (Set) null,
                    SMB2ShareAccess.ALL,
                    SMB2CreateDisposition.FILE_OPEN,
                    (Set) null
            );
            fis = file.getInputStream();
            FileUtil.initfloderPath(localDir);
            String[] filePathList = filePath.split("\\/");
            String localFilePath = localDir + "/" + filePathList[filePathList.length - 1];
            os = new FileOutputStream(localFilePath);
            byte[] b = new byte[4096];
            int length;
            while ((length = fis.read(b)) > 0) {
                os.write(b, 0, length);
            }
        } catch (IOException e) {
            throw e;
        } finally {
            IOUtils.close(os);
            IOUtils.close(fis);
            if (diskShare != null && diskShare.isConnected()) diskShare.close();
        }
    }

445端口被禁用解决办法

一般企业/政府项目为了系统安全会禁用445端口，而445端口禁用后文件共享功能无法使用，此时我们需要进行端口转发，即将客户端445端口转发到共享服务器端口A，共享服务器将本地端口A转发到445即可完成共享，具体操作步骤如下，192.168.1.164就是共享文件服务器的内网ip

查看服务器转发规则

netsh interface portproxy show all

删除服务器转发规则

netsh interface portproxy reset

共享文件服务器

• 执行CMD代码

netsh interface portproxy add v4tov4 listenport=4455 listenaddress=192.168.1.164 connectport=445 connectaddress=127.0.0.1
netsh interface portproxy add v4tov4 listenport=4455 listenaddress=127.0.0.1 connectport=445 connectaddress=127.0.0.1

客户端服务器

• 关闭Server服务
• CMD执行代码

netsh interface portproxy add v4tov4 listenaddress=127.0.0.1 listenport=445 connectaddress=192.168.1.164 connectport=4455

• 重启系统