Java实现FTP上传下载效能 _Web前端

Java实现FTP上传下载功能

Java FTP客户端工具包很多，在此我选用的Apache的FTPClient。这个包的获取可以通过[url]http://commons.apache.org/net/[/url]来获取，我使用的是最新的commons-net-1.4.1.zip。其中包含了众多的java网络编程的工具包，官方文档列举如下：
??? 支持网络协议如下:?
??????? FTP?
??????? NNTP?
??????? SMTP?
??????? POP3?
??????? Telnet?
??????? TFTP?
??????? Finger?
??????? Whois?
??????? rexec/rcmd/rlogin?
??????? Time (rdate) and Daytime?
??????? Echo?
??????? Discard?
??????? NTP/SNTP

都很有用。在此我用到的是FTP相关的一些包。

在编写程序之前，先配置一个简单的FTP服务器，如下图：

下面是一个使用FTPClient来实现的FTP上传和下载的功能，主要是对此包有个感性的认识。例程如下：

import?org.apache.commons.io.IOUtils;?
import?org.apache.commons.net.ftp.FTPClient;?

import?java.io.File;?
import?java.io.FileInputStream;?
import?java.io.IOException;?
import?java.io.FileOutputStream;?

/**?
* Apache commons-net 试用一把，看看FTP客户端工具做的好用不?
*?
* @author : leizhimin，2008-8-20 14:00:38。<p>?
*/?
public?class?FtpTest {?
????public?static?void?main(String[] args) {?
????????testUpload();?
????????testDownload();?
????}?

????/**?
???? * FTP上传单个文件测试?
???? */?
????public?static?void?testUpload() {?
????????FTPClient ftpClient =?new?FTPClient();?
????????FileInputStream fis =?null;?

????????try?{?
????????????ftpClient.connect("192.168.14.117");?
????????????ftpClient.login("admin",?"123");?

????????????File srcFile =?new?File("C:\\new.gif");?
????????????fis =?new?FileInputStream(srcFile);?
????????????//设置上传目录?
????????????ftpClient.changeWorkingDirectory("/admin/pic");?
????????????ftpClient.setBufferSize(1024);?
????????????ftpClient.setControlEncoding("GBK");?
????????????//设置文件类型（二进制）?
????????????ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);?
????????????ftpClient.storeFile("3.gif", fis);?
????????}?catch?(IOException e) {?
????????????e.printStackTrace();?
????????????throw?new?RuntimeException("FTP客户端出错！", e);?
????????}?finally?{?
????????????IOUtils.closeQuietly(fis);?
????????????try?{?
????????????????ftpClient.disconnect();?
????????????}?catch?(IOException e) {?
????????????????e.printStackTrace();?
????????????????throw?new?RuntimeException("关闭FTP连接发生异常！", e);?
????????????}?
????????}?
????}?

????/**?
???? * FTP下载单个文件测试?
???? */?
????public?static?void?testDownload() {?
????????FTPClient ftpClient =?new?FTPClient();?
????????FileOutputStream fos =?null;?

????????try?{?
????????????ftpClient.connect("192.168.14.117");?
????????????ftpClient.login("admin",?"123");?

????????????String remoteFileName =?"/admin/pic/3.gif";?
????????????fos =?new?FileOutputStream("c:/down.gif");?

????????????ftpClient.setBufferSize(1024);?
????????????//设置文件类型（二进制）?
????????????ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);?
????????????ftpClient.retrieveFile(remoteFileName, fos);?
????????}?catch?(IOException e) {?
????????????e.printStackTrace();?
????????????throw?new?RuntimeException("FTP客户端出错！", e);?
????????}?finally?{?
????????????IOUtils.closeQuietly(fos);?
????????????try?{?
????????????????ftpClient.disconnect();?
????????????}?catch?(IOException e) {?
????????????????e.printStackTrace();?
????????????????throw?new?RuntimeException("关闭FTP连接发生异常！", e);?
????????????}?
????????}?
????}?
}?