private String ip = "XXXXXXXX";

private String passWord = "XXXXXXXX";

private String username = "XXXXXXXX";

private int port = XXXXXXXX;

private static String dir = "XXXXXXXX";//文件所在目录以及保存目录，这里用了一个

private String fileName = "XXXXXXXX";

private String fileType = ".xls";

//总入口

public void download() {

FTPClient client = getclient();

createLocalFilesFromFtp(client);

}

//获得FTPClient：

public FTPClient getclient() {

Logger.info("连接ftp");

FTPClient ftpClient = new FTPClient();

try {

ftpClient.connect(ip, port);

ftpClient.login(username, passWord);// 登录

int reply = ftpClient.getReplyCode();

if (!FTPReply.isPositiveCompletion(reply)) { // 是否连接成功

ftpClient.disconnect(); // 断开连接

}

ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);

} catch (Exception e) {

Logger.info("连接失败，失败原因：" + e.getMessage() + "!");

e.printStackTrace();

}

return ftpClient;

}

//保存文件到本地

public void createLocalFilesFromFtp(FTPClient ftpClient) {

Mapmap = new HashMap();

try {

ftpClient.changeWorkingDirectory(dir);

FTPFile[] fs = ftpClient.listFiles();

//判断本地存放文件的目录是否已存在，不存在新建目录

File vfile = new File("xx");

if (!vfile.exists()) {

vfile.mkdirs();

}

int fileLength = fs.length;

if (fileLength > 0) {

for (FTPFile file : fs) {

Date date = new Date();

if (XString.equals(file.getName(), getfilename())) {

Logger.info("将要下载的文件名：" + getfilename());

OutputStream is = new FileOutputStream("xx/"

+ getfilename());

Boolean issuccess = ftpClient.retrieveFile(

getfilename(), is);

is.close();

}

}

} else {

map.put("success", false);

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}