java做的比较完善的FTP连接上传下载文件-->神经塔转移

摘自：www.mylinux.com.cn

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())[i];

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);
}
}
}

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