public static String downFile(String ip,String ftpFileName,String savePath,String fileName) {

FTPClient ftp =new FTPClient();

try{

int reply;

ftp.connect(ip,8010);

ftp.login("anonymous", null);//登录（匿名用户登录）

reply = ftp.getReplyCode();

if(!FTPReply.isPositiveCompletion(reply)) {

ftp.disconnect();

return null;

}

ftp.changeWorkingDirectory(ftpFileName);//转移到FTP服务器目录

FTPFile[] fs = ftp.listFiles();

for(FTPFile ff:fs){

if(ff.getName().equals(fileName)){

File localFile =new File(savePath + ff.getName());

if(!localFile.exists()){

if (!localFile.getParentFile().exists()) {

localFile.getParentFile().mkdirs();

}

localFile.createNewFile();

}

OutputStream is =new FileOutputStream(localFile);

ftp.setFileType(ftp.BINARY_FILE_TYPE);

ftp.retrieveFile(ff.getName(),is);

is.close();

}

}

ftp.logout();

}catch(Exception e){

e.printStackTrace();

}finally{

if(ftp.isConnected()) {

try{

ftp.disconnect();

}catch(IOException ioe) {

}

}

}

return fileName;

}