（转）FTP 操作

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);
}
}
}