在企业级应用系统中，文件上传与下载是最常用的功能之一.当然，这些文件也是有存储周期，根据业务需要而定.
驾驶员培训管理系统（简称驾培系统）需要判断学员学时的有效性,通过学时记录仪，采集学员在教练车中里照片，
上传到web服务器中，由web服务器上传到文件服务器,,比便做人脸比对..为保证学时的实时性，这期间会产生多次比对，当
然也会产生许多学员人脸照片.为方便管理这些照片，我们会采用分层级目录来存放照片.
这里主要介绍基于commons-net实现ftp创建文件夹、上传、下载功能.
连接服务器
private void connect(FTPClient ftp) throws Exception{ //连接服务器 ftp.connect( server, port); int reply = ftp.getReplyCode(); //是否连接成功 if ( !FTPReply.isPositiveCompletion( reply ) ) { throw new ConnectException( server+" 服务器拒绝连接" ); } //登陆 if (!ftp.login(username, password)) { throw new ConnectException( "用户名或密码错误" ); } }
设置属性/** * @param ftp * @throws Exception */ private void setProperty(FTPClient ftp) throws Exception { ftp.enterLocalPassiveMode(); //二进制传输,默认为ASCII ftp.setFileType(FTP.BINARY_FILE_TYPE); }创建文件夹
/**
* @param ftp
* @param remotePathName
*/
private void mkdir(FTPClient ftp, String remotePathName) throws Exception{
ftp.makeDirectory(remotePathName);
}/**
* @param ftp
*/
private void logout(FTPClient ftp) throws Exception{
ftp.noop();
ftp.logout();
}/** * @param ftp * @param remoteFileName * @param locaFileName */ private void upload(FTPClient ftp, String remoteFileName, String locaFileName) throws Exception{ //上传 InputStream input; input = new FileInputStream(locaFileName); ftp.storeFile(remoteFileName, input); input.close(); }
/** * @param ftp * @param remoteFileName * @param locaFileName */ private void download(FTPClient ftp, String remoteFileName, String locaFileName) throws Exception{ OutputStream output=null; output = new FileOutputStream(locaFileName); ftp.retrieveFile(remoteFileName, output); output.close(); }
FtpClientUtil
package com.demo.ftp; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.PrintWriter; import java.net.ConnectException; import org.apache.commons.net.PrintCommandListener; import org.apache.commons.net.ftp.FTP; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPReply; /** * @author wobendiankun 2015-1-8 下午08:11:08 */ public class FtpClientUtil { /** * ftp服务器地址 */ private String server; /** * 端口 */ private int port; /** * 用户名 */ private String username; /** * */ private String password; public FtpClientUtil () { server = "localhost"; port = 21; username = "kun"; password = "111111"; } public FtpClientUtil(String server, int port, String username, String password) { this.server = server; this.port = port; this.username = username; this.password = password; } /**上传文件 * @param remoteFileName 远程文件名称 * @param locaFileName 本地文件名称 */ public void upload(String remoteFileName,String locaFileName){ FTPClient ftp=null; try { ftp = new FTPClient(); ftp.addProtocolCommandListener( new PrintCommandListener( new PrintWriter( System.out ), true ) ); //连接ftp服务器 connect( ftp ); //设置属性 setProperty( ftp ); //上传文件 upload( ftp, remoteFileName, locaFileName ); //退出 logout( ftp ); } catch (Exception e) { e.printStackTrace(); }finally { if (ftp.isConnected()) { try { ftp.disconnect(); } catch (IOException f) { } } } } /**上传文件 * @param remoteFileName 远程文件名称 * @param locaFileName 本地文件名称 */ public void download(String remoteFileName,String locaFileName){ FTPClient ftp=null; try { ftp = new FTPClient(); ftp.addProtocolCommandListener( new PrintCommandListener( new PrintWriter( System.out ), true ) ); //连接ftp服务器 connect( ftp ); //设置属性 setProperty( ftp ); //下载文件 download( ftp, remoteFileName, locaFileName ); //退出 logout( ftp ); } catch (Exception e) { e.printStackTrace(); }finally { if (ftp.isConnected()) { try { ftp.disconnect(); } catch (IOException f) { } } } } /**创建文件夹 * @param remotePathName 远程文件夹名称 */ public void mkdir(String remotePathName) { FTPClient ftp=null; try { ftp = new FTPClient(); ftp.addProtocolCommandListener( new PrintCommandListener( new PrintWriter( System.out ), true ) ); //连接ftp服务器 connect( ftp ); //设置属性 setProperty( ftp ); //创建文件夹 mkdir( ftp, remotePathName); //退出 logout( ftp ); } catch (Exception e) { e.printStackTrace(); }finally { if (ftp.isConnected()) { try { ftp.disconnect(); } catch (IOException f) { } } } } /** * @param ftp * @param remotePathName */ private void mkdir(FTPClient ftp, String remotePathName) throws Exception{ ftp.makeDirectory(remotePathName); } /** * @param ftp * @param remoteFileName * @param locaFileName */ private void download(FTPClient ftp, String remoteFileName, String locaFileName) throws Exception{ OutputStream output=null; output = new FileOutputStream(locaFileName); ftp.retrieveFile(remoteFileName, output); output.close(); } /** * @param ftp * @throws Exception */ private void setProperty(FTPClient ftp) throws Exception { ftp.enterLocalPassiveMode(); //二进制传输,默认为ASCII ftp.setFileType(FTP.BINARY_FILE_TYPE); } /** * @param ftp */ private void logout(FTPClient ftp) throws Exception{ ftp.noop(); ftp.logout(); } /** * @param ftp * @param remoteFileName * @param locaFileName */ private void upload(FTPClient ftp, String remoteFileName, String locaFileName) throws Exception{ //上传 InputStream input; input = new FileInputStream(locaFileName); ftp.storeFile(remoteFileName, input); input.close(); } /** * @param ftp */ private void connect(FTPClient ftp) throws Exception{ //连接服务器 ftp.connect( server, port); int reply = ftp.getReplyCode(); //是否连接成功 if ( !FTPReply.isPositiveCompletion( reply ) ) { throw new ConnectException( server+" 服务器拒绝连接" ); } //登陆 if (!ftp.login(username, password)) { throw new ConnectException( "用户名或密码错误" ); } } }
FtpTest
package com.demo.ftp; /** * @author wobendiankun 2015-1-8 下午08:34:36 */ public class FtpTest { public static void main(String[] args) { //上传文件 //upload(); //下载文件 //download(); //创建文件夹 mkdir(); } /** * */ private static void mkdir() { FtpClientUtil clientUtil=new FtpClientUtil(); clientUtil.mkdir("test"); } /** * */ private static void download() { String remoteFileName="./111.txt"; String locaFileName="F:\\test\\txt\\3333.txt"; FtpClientUtil clientUtil=new FtpClientUtil(); clientUtil.download(remoteFileName, locaFileName); } /** * */ private static void upload() { String remoteFileName="./111.txt"; String locaFileName="F:\\test\\txt\\aaa.txt"; FtpClientUtil clientUtil=new FtpClientUtil(); clientUtil.upload(remoteFileName, locaFileName); } }
原文地址：http://blog.csdn.net/wobendiankun/article/details/42532301
