Applet FTP 上传

 

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 FileFtpApplet extends 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 stop method
* will always be called before destroy.

*
* A subclass of Applet 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
* init method to create the threads and the
* destroy method to kill them.

*/
public void destroy() {
// Put your code here
}

/**
* Returns information about this applet. An applet should override
* this method to return a String containing information
* about the author, version, and copyright of the applet.

*
* @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 start method is
* called.

*
* A subclass of Applet should override this method if
* it has initialization to perform. For example, an applet with
* threads would use the init method to create the
* threads and the destroy method to kill them.

*/
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 init method and each time the applet is revisited
* in a Web page.

*
* A subclass of Applet 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 start method to
* resume animation, and the stop method to suspend the
* animation.

*/
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.

*
* A subclass of Applet 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 start method to
* resume animation, and the stop method to suspend the
* animation.

*/
public void stop() {
// Put your code here
}
private static final long 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
private boolean isSaveFileName = true ;
// 枚举上传状态
public enum 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
public enum 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 = new byte [ 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 = new byte [ 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 = new byte [ 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
* 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;
}

}

 

 

二、下面是数字签名的方法和html内容

DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" >
< html >
< head >
< title > My applet 'FileFtpApplet' starting page title >
< meta http-equiv ="keywords" content ="keyword1,keyword2,keyword3" >
< meta http-equiv ="description" content ="this is my page" >
< meta http-equiv ="content-type" content ="text/html; charset=UTF-8" >
head >
< body >
< applet codebase ="."
code ="com.test.ftp.FileFtpApplet.class"
name ="FileFtpApplet"
width ="320"
archive ="FileFtpApplet.jar"
height ="240" >
applet >

body >
html >

 

签名方法：

< 1 > 、生成密匙证书(key certificate)，该证书将存储在你的.keystore文件中。Validity指的是密匙的有效期，默认是180，但是这里我们需要一年的时间，所以我们设置为365
keytool - genkey - alias FileFtpApplet - validity 365 - keystore FileFtpApplet.keystore
< 2 > 、用我们的密匙来设计我们的APPLET
jarsigner - keystore FileFtpApplet.keystore FileFtpApplet.jar FileFtpApplet
< 3 > 、导出证书
keytool - export - keystore FileFtpApplet.keystore - alias FileFtpApplet -file FileFtpApplet.cer