JAVA中FTP文件上传下载

这是偶第一次写java程序实现公司要求的FTP数据同步，所有原代码如下，以供各位参考并提出宝贵意见

！另外俺还有两个功能没有实现，有请高手指点一二：1、如何删除FTP服务器上已经下载过的文件？2、

如何将上传的文件改名？上传时在文件名前加“temp_”，上传完毕后需要把文件名改回来。3、如何使用

openPassiveDataConnection()方法将ftp连接更改为主动连接，因为要从unix系统配置的ftp服务器下载

文件的话，就需要主动连接。
 
 
 
/*
********************************************************************************************

***********
 
Filename: ftp.java
Author:   leetsing(elove)
Create date: 2004-08-30
Use:   connect to FTP server,then upload and download file
Modify date: 2004-09-05 add to upload file
  2004-09-13 add to download file
Copy right: Magisky Media Technology Co.,Ltd.
 
********************************************************************************************

***********
*/
//import cz.dhl.io.*;
//import cz.dhl.ftp.*;
import sun.net.ftp.*; 
import sun.net.*;
import java.applet.*; 
import java.io.*;
import java.io.IOException;
import java.util.StringTokenizer;
import sun.net.ftp.FtpClient;
import java.util.ArrayList;
 
public class ftp extends Applet
{
FtpClient aftp; 
DataOutputStream outputs ; 
TelnetInputStream ins; 
TelnetOutputStream outs;
 
int ch; 
public String a; 
String hostname="";
private String path = "/";
 
public static void main(String[] args) 
{
String hostname = "192.168.0.56";
int port = 2121;
String uid = "lee";
String pwd = "lee";
String RWFileDir = "D:\smsftp\";//文件目录
 
//连接ftp服务器
ftp ft = new ftp();
ft.connect(RWFileDir,hostname,port,uid,pwd); 
 
//下载文件
if (ft.aftp != null){
  try {
  ft.getNameList(RWFileDir);
  }catch(IOException e) 
  { 
  System.out.println("下载文件出错："+e);
  } 
}
 
 
//上传文件
if (ft.aftp != null){
  String sdir = RWFileDir + "subunsubfromsp\";
  File fdir = new File(sdir);
  String FileName = "";
 
  for(int i=0;i   FileName = sdir + (fdir.list());
  
  ft.uploadFile(RWFileDir,FileName);
  }
  //System.out.println("成功上传的文件：");
  //ft.showFileContents("subunsubfromsp\"); 
}
 
//删除subunsubfromsp目录下已经上传的文件文件
// ft.deleFile(RWFileDir);
 
//断开服务器连接
ft.stop(RWFileDir);
 
}
 
public FtpClient connect(String RWFileDir,String hostname,int port,String uid,String pwd) 
{
this.hostname = hostname;
System.out.println("正在连接"+hostname+"，请等待.....");
try{ 
  aftp = new FtpClient(hostname,port); 
  aftp.login(uid,pwd); 
  aftp.binary();
  //aftp.openPortDataConnection();
  a = "连接主机:"+hostname+"成功!";
  System.out.println(a); 
} 
catch(FtpLoginException e){ 
  a="登陆主机:"+hostname+"失败!请检查用户名或密码是否正确："+e; 
  System.out.println(a);
  //return false; 
} 
catch (IOException e){ 
  a="连接主机:"+hostname+"失败!请检查端口是否正确："+e; 
  System.out.println(a);
  //return false; 
} 
catch(SecurityException e) 
{ 
  a="无权限与主机:"+hostname+"连接!请检查是否有访问权限："+e; 
  System.out.println(a);
  //return false; 
} 
 
log(RWFileDir,a);
return aftp; 
} 
 
public void stop(String RWFileDir) 
{ 
String message = "";
try { 
  if(aftp!=null){
  aftp.closeServer(); 
  message = "与主机"+hostname+"连接已断开!";
  System.out.println(message); 
  log(RWFileDir,message);
  }
} 
catch(IOException e) 
{ 
  message = "与主机"+hostname+"断开连接失败!"+e;
  System.out.println(message); 
  log(RWFileDir,message);
} 
} 
 
 
public boolean downloadFile(String RWFileDir,String filepathname){ 
boolean result=true; 
String message = "";
if (aftp != null) 
{ 
  System.out.println("正在下载文件"+filepathname+",请等待...."); 
  String badfile = filepathname.substring(filepathname.length()-4,filepathname.length());
  String badlog = filepathname.substring(filepathname.length()-7,filepathname.length());
  String baddir = "";
  if ((badfile.compareTo(".bad") != 0) && (badlog.compareTo(".badlog") != 0)){
  baddir = "subunsubtosp\";
  }
  else{
  baddir = "bad\";
  }
  String strdir = "subunsubtosp\";
  //System.out.println(RWFileDir + baddir + filepathname);
  try{ 
  //FtpClient fc=new FtpClient("192.168.0.56",2121);
  //fc.login("lee","lee");
  int ch;
  File fi = new File(RWFileDir + baddir + filepathname);
  //aftp.cd(strdir);
  RandomAccessFile getFile = new RandomAccessFile(fi,"rw");
  getFile.seek(0);
  TelnetInputStream fget=aftp.get(strdir+filepathname);
  DataInputStream puts = new DataInputStream(fget);
  while ((ch = puts.read()) >= 0) {
  getFile.write(ch);
  
  }
  //s.delete();
  
  fget.close();
  getFile.close();
  //fc.closeServer();
 
  message = "下载"+filepathname+"文件到"+baddir +"目录成功!";
  System.out.println(message); 
  log(RWFileDir,message);
  } 
  catch(IOException e){ 
  message = "下载"+filepathname+"文件到"+baddir +"目录失败!"+e; 
  System.out.println(message); 
  log(RWFileDir,message);
  result = false ; 
 
  } 
} 
else{ 
  result = false; 
} 
return result; 
} 
 
 
public boolean uploadFile(String RWFileDir,String filepathname){ 
boolean result=true; 
String message = "";
if (aftp != null) 
{ 
  System.out.println("正在上传文件"+filepathname+",请等待...."); 
 
  try{ 
  String fg =new String("\subunsubfromsp\"); 
  int index = filepathname.lastIndexOf(fg); 
  String filename = filepathname.substring(index+1); 
  File localFile = new File(filepathname) ;
    
  RandomAccessFile sendFile = new RandomAccessFile(filepathname,"r"); 
  // 
  sendFile.seek(0); 
  //改名上传temp_
  filename = filename.substring(0,15)+"temp_"+filename.substring(15,filename.length());
  outs = aftp.put(filename); 
  outputs = new DataOutputStream(outs); 
  while (sendFile.getFilePointer() < sendFile.length() ) 
  { 
  ch = sendFile.read(); 
  outputs.write(ch); 
  } 
  
  rename(filename.substring(15,filename.length()),filename.substring(20,filename.length()));
  outs.close(); 
  sendFile.close(); 
  
  message = "上传"+filepathname+"文件成功!";
  System.out.println(message); 
  log(RWFileDir,message);
  } 
  catch(IOException e){ 
  message = "上传"+filepathname+"文件失败!"+e;
  System.out.println(message); 
  log(RWFileDir,message);
  result = false ; 
 
  } 
} 
else{ 
  result = false; 
} 
return result; 
} 
 
public void rename(String oldName,String newName){
 
  //aftp.renameTo(oldName,newName);
  File Old = new File(oldName); //oldName
  File New = new File(newName); //newName
  //aftp.renameTo(New);
  //boolean Old.renameTo(File newName);
  //System.out.println(Old);
  //System.out.println(New);
 
}
 
public static void deleFile(String RWFileDir) { 
//try { 
//取得ReadFile目录下的txt文件
String sdir = RWFileDir + "subunsubfromsp\";
File fdir = new File(sdir);
String FileName = "";
int j = fdir.list().length;
 
System.out.println(sdir+"目录下要删除的文件数："+fdir.list().length);
File file;
for(int i=0;i {
  //删除subunsubfromsp中的txt文件
  FileName = RWFileDir + "subunsubfromsp\" + (fdir.list())[0];
  file = new File(FileName);
  file.delete();
  System.out.println("已经成功删除"+FileName+"文件！");
}
//} 
//catch (IOException e) { 
// System.out.println("删除txt文件错误!");
// e.printStackTrace();
//}
}
 
 
public void showFileContents(String strdir) 
{ 
StringBuffer buf = new StringBuffer();
try { 
  aftp.cd(strdir);
  ins= aftp.list(); 
  while ((ch=ins.read())>=0){ 
  buf.append((char)ch); 
  } 
  
  System.out.println(buf.toString()); 
 
  ins.close(); 
    } 
catch(IOException e) 
{ 
} 
}
 
 
 
// 返回当前目录的所有文件及文件夹
 
public ArrayList getFileList() throws IOException {
BufferedReader dr = new BufferedReader(new InputStreamReader(aftp.list()));
ArrayList al = new ArrayList();
String s = "";
while ( (s = dr.readLine()) != null) {
al.add(s);
}
return al;
}
 
public void setPath(String path) throws IOException {
if (aftp == null)
this.path = path;
else {
  aftp.cd(path);
}
}
 
// 返回当前目录的文件名称
 
public ArrayList getNameList(String RWFileDir) throws IOException {
 
BufferedReader dr = new BufferedReader(new InputStreamReader(aftp.nameList

("subunsubtosp\")));
ArrayList al = new ArrayList();
String s = "";
while ( (s = dr.readLine()) != null) {
  al.add(s);
  s = s.substring(13,s.length());
  isFile(s);
  downloadFile(RWFileDir,s);
  //String strFileDelF = aftp.nameList("subunsubtosp\");
  File fileDelF=new File(s);
  fileDelF.delete();
}
return al;
//System.out.println(al.add(s));
}
 
// 判断一行文件信息是否为目录
 
public boolean isDir(String line) {
return ( (String) parseLine(line).get(0)).indexOf("d") != -1;
}
 
public boolean isFile(String line) {
return!isDir(line);
}
 
// 处理getFileList取得的行信息
 
private ArrayList parseLine(String line) {
ArrayList s1 = new ArrayList();
StringTokenizer st = new StringTokenizer(line, " ");
while (st.hasMoreTokens()) {
  s1.add(st.nextToken());
}
  return s1;
}
 
//写消息日志
public static void log(String RWFileDir,String msg)
{
String message = "";
try {
  java.text.DateFormat df = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  java.text.DateFormat dflog = new java.text.SimpleDateFormat("yyyyMMdd");
  java.util.Date date = new java.util.Date() ;
  String datestr = df.format(new java.util.Date()) ;
  String datelog = dflog.format(new java.util.Date()) ;
  //String datelog = datestr.substring(0,10);
  //datelog = datelog.replace('-',' ');
 
  //按日期每天生成一个日志文件
  FileWriter fwl = new FileWriter(RWFileDir + "CMSSftp"+datelog+".log",true);
  PrintWriter outl = new PrintWriter(fwl);
  outl.println(datestr + " " + msg);
  outl.close();
  fwl.close();
}catch (IOException e) { 
  message = "写log文件错误!"+e;
  e.printStackTrace();
  log(RWFileDir,message);
  System.out.println(message);
}
}
}