性能:使用JCIF将文件复制到Windows网络的速度非常慢 [英] Performance: Very slow file copying to Windows network using JCIF

问题描述

我正在尝试将文件从本地计算机复制到Windows服务器中的共享"文件夹.这是我使用的功能.

public static void copyFileUsingJcifs(final String domain, final String userName, final String password, final String sourcePath, final String destinationPath) throws IOException {
    final NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication(domain, userName, password);
    final SmbFile sFile = new SmbFile(destinationPath, auth);
    final SmbFileOutputStream smbFileOutputStream = new SmbFileOutputStream(sFile);
    final FileInputStream fileInputStream = new FileInputStream(new File(
            sourcePath));

    final byte[] buf = new byte[16384];
    int len;
    while ((len = fileInputStream.read(buf)) > 0) {
        smbFileOutputStream.write(buf, 0, len);
    }
    fileInputStream.close();
    smbFileOutputStream.close();
}

我尝试了此答案，但是没有不为我工作.当我进行普通复制(复制和粘贴)时，一个25MB的文件最多只需要 8分钟.但是，当我使用带有此功能的java程序时，它花费的时间超过 20分钟.如何使复制速度更快? 预先感谢.

解决方案

我注意到，jCIFS对读取的每个块都执行了操作"(afair jcifs.smb.SmbTransport.checkStatus(..))，即每个读入缓冲区的块.这意味着增加缓冲区的大小实际上可能会加快速度，尽管实际的问题仍然存在，但只会发生1到2次，对整体时间的影响较小.

设置"jcifs.util.loglevel = 3"并查看真正的错误是很有帮助的.

在我的情况下，我不得不最后设置"jcifs.smb.client.dfs.disabled = false"，因为"jcifs.resolveOrder = DNS"无济于事..

I'm trying to copy a file from my local machine to Shared folder in a windows server. This is the function which I used.

public static void copyFileUsingJcifs(final String domain, final String userName, final String password, final String sourcePath, final String destinationPath) throws IOException {
    final NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication(domain, userName, password);
    final SmbFile sFile = new SmbFile(destinationPath, auth);
    final SmbFileOutputStream smbFileOutputStream = new SmbFileOutputStream(sFile);
    final FileInputStream fileInputStream = new FileInputStream(new File(
            sourcePath));

    final byte[] buf = new byte[16384];
    int len;
    while ((len = fileInputStream.read(buf)) > 0) {
        smbFileOutputStream.write(buf, 0, len);
    }
    fileInputStream.close();
    smbFileOutputStream.close();
}

I tried this answer, but didn't work for me. When I do normal copying(Copy and Paste) it only takes maximum of 8minutes for a 25MB file. But when I use my java program using this function its taking more than 20minutes. How can I make this copying faster? Thanks in advance.

解决方案

What I noticed is that jCIFS does "something" (afair jcifs.smb.SmbTransport.checkStatus(..)) for every chunk it reads - i.e. for each chunk that is read into the buffer. That means increasing your buffer size might really speed things up, although the real problem still exists, but only occurs 1 or 2 times having a lower impact on the overall time..

It helps a lot to set "jcifs.util.loglevel=3" and have a look what's really wrong..

In my case I had to set "jcifs.smb.client.dfs.disabled=false" in the end, as "jcifs.resolveOrder=DNS" didn't help..

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