在项目中可能有时候上传的文件比较大。如果用http方式来进行文件上传的话，问题比较多。所用可以采用ftp的方式，但是一般都是做的web项目，要在浏览器中嵌入，因为对于java的话，有applet的方式，当然applet用户需要安装JRE。一般的JRE大概在10M多点。applet是在一个“沙箱”里运行，不能对用户的文件进行读取，如果要读取本地的文件，就需要对其进行授权。需要用到java_home/bin目录下的一些工具。下面的网上找的一些关于文件上传的代码和操作方式，稍微修改了一下。一、下面是applet的代码，其他需要用到commons-net-3.0-src包，可以到apache的官网网站上下载。之所以用src的包是因为需要把applet的代码和commons-net的代码都打成一个jar包。所以把commons-net-3.0-src下的源码和applet的代码放到同一个目录下，然后打成jar包。package com.test.ftp;
import java.applet.Applet;
import java.io.File;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;
/**
* 说明：本APPLET只是测试大文件FTP上传可行性
* 至于其他功能比如FTP下载、删除、FTP服务器文件列表可调用ContinueFTP相应功能。
*/
public class FileFtpAppletextends Applet {
/**
* Constructor of the applet.
*
* @exception HeadlessException if GraphicsEnvironment.isHeadless（）
* returns true.
*/
/* public FileFtpApplet（） throws HeadlessException {
super（）;
}*/
/**
* Called by the browser or applet viewer to inform
* this applet that it is being reclaimed and that it should destroy
* any resources that it has allocated. The <code>stop</code> method
* will always be called before <code>destroy</code>. <p>
*
* A subclass of <code>Applet</code> should override this method if
* it has any operation that it wants to perform before it is
* destroyed. For example, an applet with threads would use the
* <code>init</code> method to create the threads and the
* <code>destroy</code> method to kill them. <p>
*/
public void destroy（） {
// Put your code here
}
/**
* Returns information about this applet. An applet should override
* this method to return a <code>String</code> containing information
* about the author, version, and copyright of the applet. <p>
*
* @return a string containing information about the author, version, and
* copyright of the applet.
*/
public String getAppletInfo（） {
return "This is my default applet created by Eclipse";
}
/**
* Called by the browser or applet viewer to inform
* this applet that it has been loaded into the system. It is always
* called before the first time that the <code>start</code> method is
* called. <p>
*
* A subclass of <code>Applet</code> should override this method if
* it has initialization to perform. For example, an applet with
* threads would use the <code>init</code> method to create the
* threads and the <code>destroy</code> method to kill them. <p>
*/
public void init（） {
// Put your code here
}
/**
* Called by the browser or applet viewer to inform
* this applet that it should start its execution. It is called after
* the <code>init</code> method and each time the applet is revisited
* in a Web page. <p>
*
* A subclass of <code>Applet</code> should override this method if
* it has any operation that it wants to perform each time the Web
* page containing it is visited. For example, an applet with
* animation might want to use the <code>start</code> method to
* resume animation, and the <code>stop</code> method to suspend the
* animation. <p>
*/
public void start（） {
// Put your code here
}
/**
* Called by the browser or applet viewer to inform
* this applet that it should stop its execution. It is called when
* the Web page that contains this applet has been replaced by
* another page, and also just before the applet is to be destroyed. <p>
*
* A subclass of <code>Applet</code> should override this method if
* it has any operation that it wants to perform each time the Web
* page containing it is no longer visible. For example, an applet
* with animation might want to use the <code>start</code> method to
* resume animation, and the <code>stop</code> method to suspend the
* animation. <p>
*/
public void stop（） {
// Put your code here
}
private static finallong serialVersionUID= 1L;
private FileFtpApplet jFrame= null;
private JButton jFileButton= null;
public FileFtpApplet（） {
// TODO Auto-generated constructor stub
jFrame =this;
this.setSize（496,260）;
jFileButton =new JButton（"打开文件"）;
jFrame.add（jFileButton）;
jFileButton.addMouseListener（new java.awt.event.MouseAdapter（） {
public void mouseClicked（java.awt.event.MouseEvent e） {
// System.out.println（"mouseClicked（）"）;// TODO
// Auto-generated Event stub mouseClicked（）
JFileChooser jfChooser =new JFileChooser（"D:\..\.."）;
jfChooser.setDialogTitle（"打开并上传文件"）;
jfChooser.setFileFilter（new FileFilter（） {
@Override
public boolean accept（File f） {
if （f.getName（）.endsWith（"dat"）|| f.isDirectory（））
return true;
return false;
}
@Override
public String getDescription（） {
// TODO Auto-generated method stub
return"数据文件（*.dat）";
}
}）;
int result = jfChooser.showOpenDialog（jFrame）;
if （result == JFileChooser.APPROVE_OPTION） {// 确认打开
File fileIn = jfChooser.getSelectedFile（）;
if （fileIn.exists（）） {
//JOptionPane.showMessageDialog（jFrame, "OPEN"）;// 提示框
ContinueFTP myFtp =new ContinueFTP（）;
try {
long l1 = System.currentTimeMillis（）;
System.out.println（"begin:"+ l1）;
if （myFtp.connect（"10.68.7.182",21, "a","a"）） {
String remotePath ="/";
String remoteFile = myFtp.getRemoteFileName（fileIn.getName（））;
if （remotePath== null|| remotePath.trim（）.equals（""））
remotePath ="/";
//文件扩展名
String kzNm ="";
if （remoteFile.indexOf（"."）>=0）
kzNm = remoteFile.substring（remoteFile.indexOf（"."））;
String cellCode ="yp";
boolean isSaveFileName= false;
//若不保留原文件，则重新组装远程文件名
if （！isSaveFileName）
remoteFile= cellCode+"_"+System.currentTimeMillis（）+kzNm;
//获得远程路径最后一位
String lastStr = remotePath.substring（remotePath.length（）-1）;
if （lastStr.trim（）.equals（"/"））
remoteFile = remotePath+ cellCode + "/"+ remoteFile;
else
remoteFile = remotePath+ "/"+cellCode + "/"+ remoteFile;
myFtp.upload（fileIn, remoteFile）;
myFtp.disconnect（）;
long l2 = System.currentTimeMillis（）;
System.out.println（"end:"+ l2）;
System.out.println（"remaining:"+（l2-l1））;
}
} catch （Exception e1） {
System.out.println（"连接FTP出错："+e1.getMessage（））;
}
} else {
}
} else if （result == JFileChooser.CANCEL_OPTION） {
System.out.println（"Cancel button is pushed."）;
} else if （result == JFileChooser.ERROR_OPTION） {
System.err.println（"Error when select file."）;
}
}
}
）;
}
} package com.test.ftp;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.List;
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.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
/**
* FTP上传下载文件
* 支持断点续传
* @version: 2009-10-23 下午04:28:48
*/
public class ContinueFTP{
private File file=null;
//是否完整保留原文件名
privateboolean isSaveFileName= true;
//枚举上传状态
publicenum UploadStatus {
Create_Directory_Fail, //远程服务器相应目录创建失败
Create_Directory_Success, //远程服务器创建目录成功
Upload_New_File_Success, //上传新文件成功
Upload_New_File_Failed, //上传新文件失败
File_Exits, //文件已经存在
Remote_Bigger_Local, //远程文件大于本地文件
Upload_From_Break_Success, //断点续传成功
Upload_From_Break_Failed, //断点续传失败
Delete_Remote_Faild; //删除远程文件失败
}
//枚举下载状态
publicenum DownloadStatus {
Remote_File_Noexist, //远程文件不存在
Local_Bigger_Remote, //本地文件大于远程文件
Download_From_Break_Success, //断点下载文件成功
Download_From_Break_Failed, //断点下载文件失败
Download_New_Success, //全新下载文件成功
Download_New_Failed; //全新下载文件失败
}
public void init（）{
}
public FTPClient ftpClient= new FTPClient（）;
public ContinueFTP（）{
//设置将过程中使用到的命令输出到控制台
this.ftpClient.addProtocolCommandListener（new PrintCommandListener（new PrintWriter（System.out）））;
}
/**
* 功能：通过本地文件名指定远程文件名
* @param localFileName
* @return
* String
* 范例：
*/
public String getRemoteFileName（String localFileName）{
String fileName ="";
//分隔符
String sepaRator="\";
if （localFileName.indexOf（sepaRator）<0）
sepaRator="/";
//最后分隔符位置
int idx= localFileName.lastIndexOf（sepaRator）+1;
fileName = localFileName.substring（idx）;
return fileName;
}
/**
* 功能：检查远程是否存在文件
* @param remoteFileName 远程文件名
* @return
* @throws IOException
* boolean
* 范例：
*/
public boolean isFileExist（String remoteFileName）throws IOException{
boolean isFileExist= false;
//检查远程是否存在文件
FTPFile[] files = ftpClient.listFiles（new String（remoteFileName.getBytes（"GBK"）,"iso-8859-1"））;
if（files！=null&& files.length>= 1）{
isFileExist =true;
}
return isFileExist;
}
/**
* 连接到FTP服务器
* @param hostname 主机名
* @param port 端口
* @param username 用户名
* @param password 密码
* @return 是否连接成功
* @throws IOException
*/
public boolean connect（String hostname,int port,String username,String password）throws Exception{
boolean bl = false;
try{
ftpClient.connect（hostname, port）;
}catch（Exception e）{
//可具体报错到主机和端口号
e.printStackTrace（）;
// throw new BaseException（"FTPConnError01",new String[]{"connect",e.getMessage（）}）;
}
try{
//ftpClient.setControlEncoding（"GBK"）;
if（FTPReply.isPositiveCompletion（ftpClient.getReplyCode（）））{
if（ftpClient.login（username, password））{
bl = true;
}
}
}catch（Exception e）{
//可具体报错到用户和密码
// throw new BaseException（"FTPConnError02",new String[]{"connect",e.getMessage（）}）;
e.printStackTrace（）;
}
return bl;
}
/**
* 从FTP服务器上下载文件,支持断点续传，上传百分比汇报
* @param remote 远程文件路径
* @param local 本地文件路径
* @return 上传的状态
* @throws IOException
*/
public DownloadStatus download（String remote,String local）throws Exception{
//设置被动模式
ftpClient.enterLocalPassiveMode（）;
//设置以二进制方式传输
ftpClient.setFileType（FTP.BINARY_FILE_TYPE）;
DownloadStatus result;
//检查远程文件是否存在
FTPFile[] files = ftpClient.listFiles（new String（remote.getBytes（"GBK"）,"iso-8859-1"））;
if（files.length！= 1）{
// throw new BaseException（"CellDataInputService",new String[]{"download","远程文件"+remote+"不存在"}）;
System.out.println（"远程文件"+remote+"不存在"）;
}
long lRemoteSize= files[0].getSize（）;
File f = new File（local）;
//本地存在文件，进行断点下载
if（f.exists（））{
long localSize= f.length（）;
//判断本地文件大小是否大于远程文件大小
if（localSize>= lRemoteSize）{
System.out.println（"本地文件大于远程文件，下载中止"）;
return DownloadStatus.Local_Bigger_Remote;
}
//进行断点续传，并记录状态
FileOutputStream out =new FileOutputStream（f,true）;
ftpClient.setRestartOffset（localSize）;
InputStream in = ftpClient.retrieveFileStream（new String（remote.getBytes（"GBK"）,"iso-8859-1"））;
byte[] bytes= newbyte[1024];
long step = lRemoteSize /100;
long process=localSize/step;
int c;
while（（c = in.read（bytes））！=-1）{
out.write（bytes,0,c）;
localSize+=c;
long nowProcess= localSize/step;
if（nowProcess> process）{
process = nowProcess;
if（process % 10== 0）
System.out.println（"下载进度："+process）;
//TODO 更新文件下载进度,值存放在process变量中
}
}
in.close（）;
out.close（）;
boolean isDo= ftpClient.completePendingCommand（）;
if（isDo）{
result = DownloadStatus.Download_From_Break_Success;
}else {
result = DownloadStatus.Download_From_Break_Failed;
}
}else {
OutputStream out =new FileOutputStream（f）;
InputStream in= ftpClient.retrieveFileStream（new String（remote.getBytes（"GBK"）,"iso-8859-1"））;
byte[] bytes= newbyte[1024];
long step = lRemoteSize /100;
long process=0;
long localSize= 0L;
int c;
while（（c = in.read（bytes））！=-1）{
out.write（bytes, 0, c）;
localSize+=c;
long nowProcess= localSize/step;
if（nowProcess> process）{
process = nowProcess;
if（process % 10== 0）
System.out.println（"下载进度："+process）;
//TODO 更新文件下载进度,值存放在process变量中
}
}
in.close（）;
out.close（）;
boolean upNewStatus= ftpClient.completePendingCommand（）;
if（upNewStatus）{
result = DownloadStatus.Download_New_Success;
}else {
result = DownloadStatus.Download_New_Failed;
}
}
return result;
}
/**
* 上传文件到FTP服务器，支持断点续传
* @param local 本地文件名称，绝对路径
* @param remote 远程文件路径，使用/home/directory1/subdirectory/file.ext 按照Linux上的路径指定方式，支持多级目录嵌套，支持递归创建不存在的目录结构
* @return 上传结果
* @throws IOException
*/
public UploadStatus upload（File localFile,String remote）throws IOException{
//设置PassiveMode传输
ftpClient.enterLocalPassiveMode（）;
//设置以二进制流的方式传输
ftpClient.setFileType（FTP.BINARY_FILE_TYPE）;
//ftpClient.setControlEncoding（"GBK"）;
UploadStatus result;
//对远程目录的处理
String remoteFileName = remote;
if（remote.contains（"/"））{
remoteFileName = remote.substring（remote.lastIndexOf（"/"）+1）;
//创建服务器远程目录结构，创建失败直接返回
if（CreateDirecroty（remote, ftpClient）==UploadStatus.Create_Directory_Fail）{
return UploadStatus.Create_Directory_Fail;
}
}
//检查远程是否存在文件
FTPFile[] files = ftpClient.listFiles（new String（remoteFileName.getBytes（"GBK"）,"iso-8859-1"））;
if（files！=null&& files.length== 1）{
long remoteSize= files[0].getSize（）;
//File f = new File（local）;
long localSize= localFile.length（）;
if（remoteSize==localSize）{
return UploadStatus.File_Exits;
}else if（remoteSize > localSize）{
return UploadStatus.Remote_Bigger_Local;
}
//尝试移动文件内读取指针,实现断点续传
result = uploadFile（remoteFileName, localFile, ftpClient, remoteSize）;
//如果断点续传没有成功，则删除服务器上文件，重新上传
if（result== UploadStatus.Upload_From_Break_Failed）{
if（！ftpClient.deleteFile（remoteFileName））{
return UploadStatus.Delete_Remote_Faild;
}
result = uploadFile（remoteFileName, localFile, ftpClient,0）;
}
}else {
result = uploadFile（remoteFileName, localFile, ftpClient,0）;
}
return result;
}
/**
* 断开与远程服务器的连接
* @throws IOException
*/
public void disconnect（） throws IOException{
if（this.ftpClient.isConnected（））{
this.ftpClient.disconnect（）;
}
}
/**
* 功能：创建目录
* 若传入路径已经存在,则返回该路径,否则创建
* 目前暂不支持中文列名
* @param remoteDir
* @return
* @throws IOException
* String
* 范例：
*/
public String CreateDirecroty（String remoteDir）throws IOException{
String fillDir ="";
UploadStatus st = CreateDirecroty（remoteDir,this.ftpClient）;
if （st == UploadStatus.Create_Directory_Success）
fillDir = remoteDir;
else
fillDir = "";
return fillDir;
}
/**
* 递归创建远程服务器目录
* @param remote 远程服务器文件绝对路径
* @param ftpClient FTPClient对象
* @return 目录创建是否成功
* @throws IOException
*/
public UploadStatus CreateDirecroty（String remote,FTPClient ftpClient）throws IOException{
UploadStatus status = UploadStatus.Create_Directory_Success;
String directory = remote.substring（0,remote.lastIndexOf（"/"）+1）;
if（！directory.equalsIgnoreCase（"/"）&&！ftpClient.changeWorkingDirectory（new String（directory.getBytes（"GBK"）,"iso-8859-1"）））{
//如果远程目录不存在，则递归创建远程服务器目录
int start=0;
int end = 0;
if（directory.startsWith（"/"））{
start = 1;
}else{
start = 0;
}
end = directory.indexOf（"/",start）;
while（true）{
String subDirectory =new String（remote.substring（start,end）.getBytes（"GBK"）,"iso-8859-1"）;
if（！ftpClient.changeWorkingDirectory（subDirectory））{
if（ftpClient.makeDirectory（subDirectory））{
ftpClient.changeWorkingDirectory（subDirectory）;
}else {
System.out.println（"创建目录失败"）;
return UploadStatus.Create_Directory_Fail;
}
}
start = end+ 1;
end = directory.indexOf（"/",start）;
//检查所有目录是否创建完毕
if（end<= start）{
break;
}
}
}
return status;
}
/**
* 上传文件到服务器,新上传和断点续传
* @param remoteFile 远程文件名，在上传之前已经将服务器工作目录做了改变
* @param localFile 本地文件File句柄，绝对路径
* @param processStep 需要显示的处理进度步进值
* @param ftpClient FTPClient引用
* @return
* @throws IOException
*/
public UploadStatus uploadFile（String remoteFile,File localFile,FTPClient ftpClient,long remoteSize）throws IOException{
UploadStatus status;
//显示进度的上传
long step= localFile.length（）/ 100;
long process= 0;
long localreadbytes= 0L;
RandomAccessFile raf =new RandomAccessFile（localFile,"r"）;
OutputStream out = ftpClient.appendFileStream（new String（remoteFile.getBytes（"GBK"）,"iso-8859-1"））;
//断点续传
if（remoteSize>0）{
ftpClient.setRestartOffset（remoteSize）;
process = remoteSize/step;
raf.seek（remoteSize）;
localreadbytes = remoteSize;
}
byte[] bytes= newbyte[1024];
int c;
while（（c = raf.read（bytes））！=-1）{
out.write（bytes,0,c）;
localreadbytes+=c;
//TODO 汇报上传状态
if（localreadbytes/ step ！= process）{
process = localreadbytes/ step;
System.out.println（"上传进度:"+ process）;
}
}
out.flush（）;
raf.close（）;
out.close（）;
boolean result=ftpClient.completePendingCommand（）;
if（remoteSize> 0）{
status = result？UploadStatus.Upload_From_Break_Success:UploadStatus.Upload_From_Break_Failed;
}else {
status = result？UploadStatus.Upload_New_File_Success:UploadStatus.Upload_New_File_Failed;
}
return status;
}
/**
* 功能：获得远程文件列表
* @param remoteDir 远程路径
* @return
* List<String>
* 范例：
*/
public List<String> getRemoteFileList（String remoteDir）{
List<String> list= new ArrayList<String>（）;
FTPFile[] files;
try {
files = ftpClient.listFiles（remoteDir）;
for （int i= 0; i< files.length; i++） {
list.add（files[i].getName（））;
}
} catch （IOException e） {
// TODO Auto-generated catch block
e.printStackTrace（）;
}
return list;
}
/**
* 功能：删除指定远程文件
* @param fillFileName 包括路径的完整文件名
* @return
* @throws Exception
* boolean
* 范例：
*/
public boolean deleteFile（String fillFileName）throws Exception {
boolean bl = false;
this.ftpClient.deleteFile（fillFileName）;
int status = this.ftpClient.getReplyCode（）;
if（status == 250）{
bl = true;
System.out.println（"成功删除FTP服务器中文件:"+ fillFileName）;
}
return bl;
} /**
* 功能：删除指定远程路径
* @param remoteDir
* @return
* @throws Exception
* boolean
* 范例：
*/
public boolean deleteDir（String remoteDir）throws Exception {
boolean isDel= false;
this.ftpClient.removeDirectory（remoteDir）;
int status = this.ftpClient.getReplyCode（）;
if（status == 250）{
isDel = true;
System.out.println（"成功删除FTP服务器中目录:"+ remoteDir）;
}
return isDel;
}
public static void main（String[] args）throws Exception {
ContinueFTP myFtp =new ContinueFTP（）;
try {
long l1 = System.currentTimeMillis（）;
System.out.println（"begin:"+ l1）;
if （myFtp.connect（"192.168.1.101",21, "cfd","123456"）） {
String mkDir = myFtp.CreateDirecroty（"TTT/ccc/"）;
if （mkDir ！= null&& ！mkDir.trim（）.equals（""））
System.out.println（"mkDir success:"+mkDir）;
//myFtp.download（ "/XA01B03H05/5.mp3",file,"0"）;
//myFtp.upload（"/XA01B03H05/5.mp3", "/云台山.mpg"）;
//myFtp.delete_file（"/tmp.txt"）;
//String str = new String（"电视剧"）;
//myFtp.ftpClient.removeDirectory（"/kkk/jk/"）;
//myFtp.ftpClient.makeDirectory（new String（str.getBytes（"GBK"）,"iso-8859-1"））;
myFtp.disconnect（）;
long l2 = System.currentTimeMillis（）;
System.out.println（"end:"+ l2）;
System.out.println（"remaining:"+（l2-l1））;
}
} catch （IOException e） {
System.out.println（"连接FTP出错："+e.getMessage（））;
}
}
public File getFile（） {
return file;
}
public void setFile（File file） {
this.file = file;
}
public boolean isSaveFileName（） {
return isSaveFileName;
}
public void setSaveFileName（boolean isSaveFileName） {
this.isSaveFileName= isSaveFileName;
}
}
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