java做的比较完善的FTP连接上传下载文件

文章来至：
http://www.cnsdn.com.cn/blog/article.asp?id=1060



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);
}
}
}