使用 apache的 common FTPClient 操作ftp

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;

public class FtpUtil {
private FTPClient ftpClient;
public static final int BINARY_FILE_TYPE = FTP.BINARY_FILE_TYPE;
public static final int ASCII_FILE_TYPE = FTP.ASCII_FILE_TYPE;

// path should not the path from root index
// or some FTP server would go to root as '/'.
public void connectServer(FtpConfig ftpConfig) throws SocketException,
IOException {
String server = ftpConfig.getServer();
int port = ftpConfig.getPort();
String user = ftpConfig.getUsername();
String password = ftpConfig.getPassword();
String location = ftpConfig.getLocation();
connectServer(server, port, user, password, location);
}


public void connectServer(String server, int port, String user,
String password, String path) throws SocketException, IOException {
ftpClient = new FTPClient();
ftpClient.connect(server, port);
System.out.println("Connected to " + server + ".");
System.out.println(ftpClient.getReplyCode());
ftpClient.login(user, password);
// Path is the sub-path of the FTP path
if (path.length() != 0) {
ftpClient.changeWorkingDirectory(path);
}
}
//FTP.BINARY_FILE_TYPE | FTP.ASCII_FILE_TYPE
// Set transform type
public void setFileType(int fileType) throws IOException {
ftpClient.setFileType(fileType);
}

public void closeServer() throws IOException {
if (ftpClient.isConnected()) {
ftpClient.disconnect();
}
}
//=======================================================================
//==         About directory       =====
// The following method using relative path better.
//=======================================================================

public boolean changeDirectory(String path) throws IOException {
return ftpClient.changeWorkingDirectory(path);
}
public boolean createDirectory(String pathName) throws IOException {
return ftpClient.makeDirectory(pathName);
}
public boolean removeDirectory(String path) throws IOException {
return ftpClient.removeDirectory(path);
}

// delete all subDirectory and files.
public boolean removeDirectory(String path, boolean isAll)
throws IOException {

if (!isAll) {
return removeDirectory(path);
}

FTPFile[] ftpFileArr = ftpClient.listFiles(path);
if (ftpFileArr == null || ftpFileArr.length == 0) {
return removeDirectory(path);
}
//
for (FTPFile ftpFile : ftpFileArr) {
String name = ftpFile.getName();
if (ftpFile.isDirectory()) {
System.out.println("* [sD]Delete subPath ["+path + "/" + name+"]");
removeDirectory(path + "/" + name, true);
} else if (ftpFile.isFile()) {
System.out.println("* [sF]Delete file ["+path + "/" + name+"]");
deleteFile(path + "/" + name);
} else if (ftpFile.isSymbolicLink()) {

} else if (ftpFile.isUnknown()) {

}
}
return ftpClient.removeDirectory(path);
}

// Check the path is exist; exist return true, else false.
public boolean existDirectory(String path) throws IOException {
boolean flag = false;
FTPFile[] ftpFileArr = ftpClient.listFiles(path);
for (FTPFile ftpFile : ftpFileArr) {
if (ftpFile.isDirectory()
&& ftpFile.getName().equalsIgnoreCase(path)) {
flag = true;
break;
}
}
return flag;
}

//=======================================================================
//==         About file        =====
// Download and Upload file using
// ftpUtil.setFileType(FtpUtil.BINARY_FILE_TYPE) better!
//=======================================================================

// #1. list & delete operation
// Not contains directory
public List<String> getFileList(String path) throws IOException {
// listFiles return contains directory and file, it's FTPFile instance
// listNames() contains directory, so using following to filer directory.
//String[] fileNameArr = ftpClient.listNames(path);
FTPFile[] ftpFiles= ftpClient.listFiles(path);

List<String> retList = new ArrayList<String>();
if (ftpFiles == null || ftpFiles.length == 0) {
return retList;
}
for (FTPFile ftpFile : ftpFiles) {
if (ftpFile.isFile()) {
retList.add(ftpFile.getName());
}
}
return retList;
}

public boolean deleteFile(String pathName) throws IOException {
return ftpClient.deleteFile(pathName);
}

// #2. upload to ftp server
// InputStream <------> byte[]  simple and See API

public boolean uploadFile(String fileName, String newName)
throws IOException {
boolean flag = false;
InputStream iStream = null;
try {
iStream = new FileInputStream(fileName);
flag = ftpClient.storeFile(newName, iStream);
} catch (IOException e) {
flag = false;
return flag;
} finally {
if (iStream != null) {
iStream.close();
}
}
return flag;
}

public boolean uploadFile(String fileName) throws IOException {
return uploadFile(fileName, fileName);
}

public boolean uploadFile(InputStream iStream, String newName)
throws IOException {
boolean flag = false;
try {
// can execute [OutputStream storeFileStream(String remote)]
// Above method return's value is the local file stream.
flag = ftpClient.storeFile(newName, iStream);
} catch (IOException e) {
flag = false;
return flag;
} finally {
if (iStream != null) {
iStream.close();
}
}
return flag;
}

// #3. Down load

public boolean download(String remoteFileName, String localFileName)
throws IOException {
boolean flag = false;
File outfile = new File(localFileName);
OutputStream oStream = null;
try {
oStream = new FileOutputStream(outfile);
flag = ftpClient.retrieveFile(remoteFileName, oStream);
} catch (IOException e) {
flag = false;
return flag;
} finally {
oStream.close();
}
return flag;
}

public InputStream downFile(String sourceFileName) throws IOException {
return ftpClient.retrieveFileStream(sourceFileName);
}