ftp是url怎么连接 java java ftp连接池

抽象类：

package com.echo.store;
import java.util.Enumeration;
import java.util.Hashtable;
abstract class ObjectPool {
long ttl ;
Hashtable lock,unlock ;
public ObjectPool() {
ttl = 50000;
lock = new Hashtable();
unlock = new Hashtable();
}
abstract T create();
abstract boolean valide(T t);
abstract void destory( T t );
synchronized public T takeOut(){
long now = System.currentTimeMillis();
T t ;
if(unlock.size() > 0){
Enumeration e = unlock.keys();
while ( e.hasMoreElements() ){
t = e.nextElement();
if( ( now-unlock.get(t) > ttl) || !valide(t) ){
unlock.remove(t);
destory(t);
t = null;
}else{
unlock.remove(t);
lock.put(t, ttl);
return t;
}
}
}
t = create();
lock.put(t,ttl);
return t;
}
synchronized public void takeIn( T t ){
lock.remove(t);
unlock.put( t, ttl);
}
}

Ftp链接池实现类：

package com.echo.store;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import java.io.IOException;
import java.util.Hashtable;
public class FtpPool extends ObjectPool {
FtpConfig ftpConfig;
public static Hashtable instance = new Hashtable();
public static final FtpPool getInstance( FtpConfig cfg ){
if (instance.get(cfg) == null) {
synchronized (FtpPool.class){
if (instance.get(cfg) == null) {
instance.put(cfg, new FtpPool( cfg ));
}
}
}
return instance.get(cfg);
}
public FtpPool( FtpConfig ftpCfg ) {
ftpConfig = ftpCfg;
}
@Override
FTPClient create( ) {
FTPClient ftpClient = new FTPClient();
try {
ftpClient.connect(ftpConfig.getIp());
ftpClient.login(ftpConfig.getUser(),ftpConfig.getPasswd());
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
} catch (IOException e) {
e.printStackTrace();
}
return ftpClient;
}
@Override
boolean valide(FTPClient ftpClient) {
return ftpClient.isConnected();
}
@Override
void destory(FTPClient ftpClient) {
//ftpClient.;
}
}

调用方法：

public static void main(String[] args) {
FtpConfig cfg = new FtpConfig();
cfg.setIp("xxx");
cfg.setUser("xxx");
cfg.setPasswd("vvv");
FtpPool instance = FtpPool.getInstance(cfg);
FTPClient ftpClient = instance.takeOut();
FtpOperation ftpOperation = FtpOperation.getInstance();
ftpOperation.download(ftpClient,"/remote", "./location");
}

上传方法实现：

package com.echo.services;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
public class FtpOperation {
Logger log = LoggerFactory.getLogger(FtpOperation.class);
public static FtpOperation instance = null;
private FtpOperation() {}
public static FtpOperation getInstance(){
if( instance == null ){
synchronized (FtpOperation.class){
if (instance == null) {
instance = new FtpOperation();
}
}
}
return instance;
}
public void download(FTPClient ftpClient, String remote, String loc ){
try {
log.info("remote :"+remote);
ftpClient.changeWorkingDirectory(remote);
//生成本地目录
File locFile = new File(loc);
if( !locFile.exists() ){
locFile.mkdir();
}
downLoadFile(ftpClient, loc);
} catch (IOException e) {
e.printStackTrace();
}
}
private void downLoadFile( FTPClient ftpClient, String LocDir ){
try {
for (FTPFile ftpFile : ftpClient.listFiles()) {
String path = LocDir+"/"+ftpFile.getName();
if( ftpFile.isDirectory() ){
//生成本地目录
File localFile = new File( path );
if( !localFile.exists() ){
localFile.mkdir();
}
//浏览Ftp目录
ftpClient.changeWorkingDirectory( ftpFile.getName());
downLoadFile(ftpClient, path );
ftpClient.changeToParentDirectory();
}else{
if(
( !ftpFile.getName().equals("ualice.access.log") )
){
continue;
}
FileOutputStream fostream = new FileOutputStream( path );
ftpClient.retrieveFile(ftpFile.getName(), fostream);
fostream.flush();
fostream.close();
log.info("文件："+LocDir+ftpFile.getName()+" 下载完毕。");
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}