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);
}
}
}