个人工具类 -- FTPUtil

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;

    static Logger logger = org.slf4j.LoggerFactory.getLogger(FTPUtil.class);

    /**
     * 使用详细信息进行ftp服务器连接: <br>
     * 〈功能详细描述〉
     *
     * @param host :服务器地址名称
     * @param port ：端口号
     * @param user ：用户名
     * @param password ：appendFile
     * @param path ：转移到FTP服务器目录
     * @throws SocketException
     * @throws IOException
     */
    public void connectServer(String host, int port, String user, String password, String path) throws SocketException,
            IOException {
        ftpClient = new FTPClient();
        ftpClient.connect(host, port);
        ftpClient.login(user, password);
        if (path != null && path.length() != 0) {

            boolean changeok = ftpClient.changeWorkingDirectory(path);
            if (!changeok) {
                // 变更目录失败，生成目录
                ftpClient.mkd(path);
                ftpClient.changeWorkingDirectory(path);
            }
        }
        ftpClient.setBufferSize(1024);// 设置上传缓存大小
        ftpClient.setControlEncoding("UTF-8");// 设置编码
        ftpClient.setFileType(BINARY_FILE_TYPE);// 设置文件类型
    }

    /**
     * 关闭连接
     * 
     * @throws IOException
     */
    public void closeServer() throws IOException {
        if (ftpClient != null && ftpClient.isConnected()) {
            ftpClient.logout();// 退出FTP服务器
            ftpClient.disconnect();// 关闭FTP连接
        }
    }

    /**
     * 删除服务器上的文件
     * 
     * @param pathName
     * @return
     * @throws IOException
     */
    public boolean deleteFile(String pathName) throws IOException {
        return ftpClient.deleteFile(pathName);
    }

    /**
     * 以流的方式上传文件到ftp服务器: <br>
     * 〈功能详细描述〉
     *
     * @param iStream :输入流
     * @param remoteFileName :上传到服务器的文件名称
     * @return
     * @throws IOException
     */
    public boolean uploadFile(InputStream iStream, String remoteFileName) throws IOException {
        boolean flag = false;
        try {
            // 将文件名转码，防止中文文件名上传失败失败问题，
            flag = ftpClient.storeFile(new String(remoteFileName.getBytes("UTF-8"), "iso-8859-1"), iStream);
        } catch (IOException e) {
            flag = false;
            logger.error("uploadFile 文件转码失败 ：" + e);
            return flag;
        } finally {
            if (iStream != null) {
                iStream.close();
            }
        }
        return flag;
    }

    /**
     * 从ftp服务器上下载文件到本地输入流: <br>
     * 〈功能详细描述〉
     *
     * @param sourceFileName ：服务器资源文件名称
     * @param oStream ：本地输入流
     * @throws IOException
     */
    public void retrieveFile(String sourceFileName, OutputStream oStream) throws IOException {
        ftpClient.retrieveFile(new String(sourceFileName.getBytes("UTF-8"), "iso-8859-1"), oStream);
    }

    /**
     * 上传文件，从ftp服务器上拿到OutputStream，往流中写入数据: <br>
     * 〈功能详细描述〉
     *
     * @param remoteFileName
     * @return
     * @throws IOException
     */
    public OutputStream storeUniqueFileStream(String remoteFileName) throws IOException {
        OutputStream oStream = ftpClient.storeUniqueFileStream(remoteFileName);
        return oStream;
    }

    public void downLoad(String remoteFileName, String fileName) {
        try {
            ftpClient.retrieveFile("/" + remoteFileName, new FileOutputStream(fileName));
        } catch (FileNotFoundException e) {
            logger.error(e.getMessage(), e);
        } catch (IOException e) {
            logger.error(e.getMessage(), e);
        }
    }

    /**
     * 从ftp服务器上获取上传的文件 <br>
     * 〈功能详细描述〉
     *
     * @return
     */
    public List<FTPFile> getListFiles(String ftpFilePath) {
        try {
            List<FTPFile> fileList = Arrays.asList(ftpClient.listFiles(ftpFilePath));
            return fileList;
        } catch (IOException e) {
            logger.error(e.getMessage(), e);
        }
        return null;
    }

}

文件下载设置相应头

public void downLoadCsv(ModelMap model, HttpServletRequest request, HttpServletResponse response) throws BizServiceException {
        Long batchId = Long.parseLong(request.getParameter("batchId"));    // 获取批次id
        String fileName = batchId + ".csv";// 文件名
        // 设置响应头
        response.setContentType("application/x-download");
        response.addHeader("Content-Disposition", "attachment;filename=" + fileName);
        // 文件下载
        try {
           hService.downLoadFile(fileName, response.getOutputStream());
        } catch (IOException e) {
            logger.error("下载文件异常", e);
           throw  new BizServiceException("文件下载异常");
        }
    }