blocks|key|356857|text|请查看Apache，其中包含commons-net实用程序。首先，我不确定它是否满足您的所有要求，但它肯定是免费的！|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|356858|entityMap|0|LINK|mutability|MUTABLE|url|http://commons.apache.org/net/^0|E|B|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Check out Apache <a href="http://commons.apache.org/net/" rel="noreferrer">commons-net</a>, which contains FTP utilities. Off the top of my head I'm not sure if it meets all of your requirements, but it's certainly free!

blocks|key|3142898|text|你还有这个2006+article，它为FTP客户端列出了不同的选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3142899|commons-net很好，但FTP-GO可以为您提供一些您正在寻找的更高级的功能。|3142900|​|3142901|📷|atomic|3142902|3142903|entityMap|0|LINK|mutability|MUTABLE|url|http://www.nsftools.com/tips/JavaFtp.htm|1|https://web.archive.org/web/20081213000904/http://www.cellspark.com/ftp.html|2|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/b9fba50217388f161db23ac54065de2c.jpeg|imageAlt^0|5|C|0|0|F|6|1|0|0|0|1|2|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@$A|12|B|13|1|14]]|C|$]]|$1|D|3|E|5|6|7|15|8|@]|9|@$A|16|B|17|1|18]]|C|$]]|$1|F|3|G|5|6|7|19|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|1A|8|@]|9|@$A|1B|B|1C|1|1D]]|C|$]]|$1|K|3|G|5|6|7|1E|8|@]|9|@]|C|$]]|$1|L|3|-4|5|6|7|1F|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]|T|$5|O|P|Q|C|$R|U]]|V|$5|W|P|X|C|$Y|Z|10|-4]]]]

You have also this <a href="http://www.nsftools.com/tips/JavaFtp.htm" rel="nofollow noreferrer">2006 article</a> which lists different options for FTP clients.

commons-net is good, but <a href="https://web.archive.org/web/20081213000904/http://www.cellspark.com/ftp.html" rel="nofollow noreferrer">FTP-GO</a> can give you some of the more advanced features you are looking for.

<img src="https://i.stack.imgur.com/lGmOE.jpg" alt="kagi Ftp-Go">

blocks|key|357553|text|Commons-net当然。:)现在大多数开源项目都在使用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|357554|yc|357555|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Commons-net surely. :) Most open source projects use it these days.

yc

blocks|key|355477|text|我使用了Apache+Commons+VFS|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|355478|cya|355479|entityMap|0|LINK|mutability|MUTABLE|url|http://commons.apache.org/vfs/^0|4|I|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

I used <a href="http://commons.apache.org/vfs/" rel="noreferrer">Apache Commons VFS</a>

cya

blocks|key|3142913|text|我已经成功地使用了Enterprise+DT+FTP库，它是免费和开源的。我不能将它与其他库(如Apache+Commons+Net库)进行比较，因为我还没有使用过它们。它确实提供了到SFTP+(通过SSH)和FTPS+(通过SSL)的简单升级路径，尽管这是一个付费的商业产品。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3142914|entityMap|0|LINK|mutability|MUTABLE|url|http://www.enterprisedt.com/^0|9|H|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I have successfully used the <a href="http://www.enterprisedt.com/" rel="nofollow noreferrer">Enterprise DT FTP</a> library, which is free and open source. I can't compare it to other libraries (like the Apache Commons Net library) since I haven't used them. It does provide a simple upgrade path to SFTP (over SSH) and FTPS (over SSL), though that is a pay-for commercial product.

blocks|key|360318|text|Apache+commons-+get最近更新更频繁，而Enterprise+DT库似乎更新更频繁。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|360319|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Apache commons-nets get updates more frequently recently, while Enterprise DT library seems to update even more frequently.

blocks|key|3355784|text|是的，EnterpriseDT的edtFTPj是稳定的(2000年首次发布)，具有您可能需要的所有功能，而且也是开源的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3355785|它在许多开源项目(以及许多商业项目)中使用，并且被公认为one+of+the+fastest+client+libraries+around。|3355786|正如另一位发帖者所指出的，如果你确实希望升级到SFTP和/或FTPS，这是一个简单的升级路径，只需要很少的代码更改。|3355787|entityMap|0|LINK|mutability|MUTABLE|url|http://www.enterprisedt.com/products/edtftpj/overview.html|1|http://www.javaworld.com/javaworld/jw-03-2006/jw-0306-ftp.html?page=3^0|G|7|0|0|S|16|1|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]]]

Yes, EnterpriseDT's <a href="http://www.enterprisedt.com/products/edtftpj/overview.html" rel="noreferrer">edtFTPj</a> is stable (first released in 2000), has all the features you might need, and is open source as well. 

It's used in a bunch of open source projects (as well as in many commercial projects), and is acknowledged to be <a href="http://www.javaworld.com/javaworld/jw-03-2006/jw-0306-ftp.html?page=3" rel="noreferrer">one of the fastest client libraries around</a>. 

As another poster noted, if you do wish to upgrade to SFTP and/or FTPS, it is a simple upgrade path with very few code changes required.

blocks|key|360321|text|无论是特性还是许可证，ftp4j都是最好的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|360322|http://www.sauronsoftware.it/projects/ftp4j/|offset|length|360323|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|18|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

ftp4j is the best one, both for features and license:

<a href="http://www.sauronsoftware.it/projects/ftp4j/" rel="noreferrer">http://www.sauronsoftware.it/projects/ftp4j/</a>

blocks|key|355492|text|我在下载视频文件。阿帕奇的FTPClient笨手笨脚地下载了视频，速度相当快。但当我试图回放视频时，它丢失了视频中间的大块。ftp4j会毫无损失地下载整个视频。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|355493|ftp4j+ftw|355494|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I was downloading video files. Apache's FTPClient fumbled, it downloaded the video reasonably fast. but when I tried to play the video back, it lost chunks out of the middle of the video. ftp4j would download the whole video with no loss.

ftp4j ftw

Since I received no positives answers to my <a href="https://stackoverflow.com/questions/285237/does-a-javascriptable-ftp-upload-javaflash-applet-exist">last</a> question. I will try to write a Java FTP upload applet myself.

My question is: "Can you recommend a Java FTP client library for me to use?"

I want it to be:

<ul>
<li>stable</li>
<li>able to handle passive and active modes</li>
<li>able to provide upload progress information</li>
<li>throw catchable exceptions if something went wrong (especially when an upload does not succeed)</li>
<li>cheap/free to use, preferably open source</li>
</ul>

I found <a href="http://www.javaworld.com/javaworld/jw-04-2003/jw-0404-ftp.html" rel="noreferrer">this</a> <a href="http://www.javaworld.com/javaworld/jw-04-2003/ftp/jw-0404-ftptable.html" rel="noreferrer">overview</a> of some libraries, but since this article is from 2003, maybe some new developments have happened :)

What Java FTP client library should I use?

Java

因为我的问题没有得到肯定的回答。我将尝试自己编写一个Java FTP upload applet。我的问题是：“你能推荐一个Java FTP客户端库给我使用吗？”我希望它是：stableable用于处理被动和主动模式如果出现问题，能够提供上载进度和可捕获的异常(尤其是在上载未succeed)cheap/free to ...

问我应该使用什么Java FTP客户端库？
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