FTPClient 文件上传下载实现

public class FtpUtil {
	
	Integer time = 7200000;

    private static final Logger log = LoggerFactory.getLogger(FtpUtil.class);

    public FTPClient ftpClient = null;

    public FTPClient getFTPClient(String ftpHost, String ftpUserName, String ftpPassword, int ftpPort)
            throws SocketException, IOException {
        ftpClient = new FTPClient();
        ftpClient.setControlEncoding("utf-8");
        ftpClient.setDataTimeout(time); // 设置传输超时时间
        ftpClient.setConnectTimeout(time); // 连接超时
        // 设置编码格式为二进制编码，防止文件损坏
        try {
            ftpClient.connect(ftpHost, ftpPort);// 连接FTP服务器
            ftpClient.login(ftpUserName, ftpPassword);// 登陆FTP服务器
           
            if (!FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {
                log.error("未连接到FTP，用户名或密码错误。");
                ftpClient.disconnect();
            }
        }catch (Exception e) {
        	throw new RuntimeException("FTP的端口错误,请正确配置。",e);
        }
        return ftpClient;
    }

    /**
     *
     * 上传文件
     * @param ftpClient ftp客户端
     * @param parentPath 根目录
     * @param dirPath 文件目录
     * @param fileName 文件名
     * @param originfilename 待上传文件路径 绝对路径
     * @return
     * @throws Exception
     */
    public boolean uploadFile(FTPClient ftpClient, String parentPath, String dirPath, String fileName, String originfilename) throws Exception {
        log.info("开始上传 ftp 文件，ftp目录：{}，ftp 文件夹：{}，上传文件名：{}，本地文件路径：{}",parentPath,dirPath,fileName,originfilename);
        InputStream inputStream = new FileInputStream(new File(originfilename));
        return uploadFile(ftpClient, parentPath, dirPath,fileName,inputStream);
    }

    /**
     * 上传文件
     * @param ftpClient ftp客户端
     * @param parentPath 根目录
     * @param dirPath 文件目录
     * @param fileName 文件名
     * @param inputStream 待上传文件流
     * @return
     * @throws Exception
     */
    public boolean uploadFile(FTPClient ftpClient, String parentPath, String dirPath, String fileName, InputStream inputStream)
            throws Exception {
        boolean flag = false;
        try {
            log.info("开始上传文件.....");
            this.ftpClient = ftpClient;
            ftpClient.enterLocalPassiveMode();
            // 保持连接
            ftpClient.setKeepAlive(true);
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            //判断FPT目标文件夹时候存在不存在则创建
            if (!changeWorkingDirectory(parentPath)) {
                // 创建远程文件夹
                createDirecroty(parentPath);
            }
            // 进入到公共目录
            changeWorkingDirectory(parentPath);
            // 创建文件夹
            if (!changeWorkingDirectory(dirPath)) {
                // 创建远程文件夹
                makeDirectory(dirPath);
            }
            // 进入到子目录
            changeWorkingDirectory(dirPath);
            // 文件上传
            ftpClient.storeFile(fileName, inputStream);
            inputStream.close();
            ftpClient.logout();
            flag = true;
            log.info("上传文件成功");
        } catch (Exception e) {
            log.error("上传文件失败", e);
            throw new RuntimeException("上传文件失败", e);
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (Exception e) {
                    throw new RuntimeException("上传文件失败", e);
                }
            }
        }
        return flag;
    }


    // 改变目录路径
    public boolean changeWorkingDirectory(String directory) throws Exception {
        boolean flag = true;
        try {
            // flag = getDefaultFtpClient().changeWorkingDirectory(directory);
            flag = ftpClient.changeWorkingDirectory(directory);
            if (flag) {
                log.info("进入文件夹" + directory + " 成功！\"");
            } else {
                log.info("进入文件夹" + directory + " 失败！开始创建文件夹");
            }
        } catch (Exception e) {
            throw new RuntimeException("改变目录路径失败", e);
        }
        return flag;
    }

    // 创建多层目录文件，如果有ftp服务器已存在该文件，则不创建，如果无，则创建
    public boolean createDirecroty(String remote) throws Exception {
        boolean success = true;
        String directory = remote + "/";
        // 如果远程目录不存在，则递归创建远程服务器目录
        if (!directory.equalsIgnoreCase("/") && !changeWorkingDirectory(new String(directory))) {
            int start = 0;
            int end = 0;
            if (directory.startsWith("/")) {
                start = 1;
            } else {
                start = 0;
            }
            end = directory.indexOf("/", start);
            String path = "";
            String paths = "";
            while (true) {
                String subDirectory = new String(remote.substring(start, end).getBytes("UTF-8"));
                path = path + "/" + subDirectory;
                log.info("path:{},subDirectory:{}", path, subDirectory);
                // false表示当前文件夹下没有文件
                if (!existFile(path)) {
                    if (makeDirectory(subDirectory)) {
                        changeWorkingDirectory(subDirectory);
                    } else {
                        log.error("创建目录[" + subDirectory + "]失败");
                        changeWorkingDirectory(subDirectory);
                    }
                } else {
                    changeWorkingDirectory(subDirectory);
                }
                paths = paths + "/" + subDirectory;
                start = end + 1;
                end = directory.indexOf("/", start);
                // 检查所有目录是否创建完毕
                if (end <= start) {
                    break;
                }
            }
        }
        return success;
    }

    // 判断ftp服务器文件是否存在
    public boolean existFile(String path) throws IOException {
        boolean flag = false;
        FTPFile[] ftpFileArr = ftpClient.listFiles(path);
        // FTPFile[] ftpFileArr = getDefaultFtpClient().listFiles(path);
        if (ftpFileArr.length > 0) {
            flag = true;
        }
        return flag;
    }

    // 创建目录
    public boolean makeDirectory(String dir) {
        boolean flag = true;
        try {
            // flag = getDefaultFtpClient().makeDirectory(dir);
            flag = ftpClient.makeDirectory(dir);
            if (flag) {
                log.info("创建文件夹" + dir + " 成功！");
            } else {
                log.error("创建文件夹" + dir + " 失败！");
            }
        } catch (Exception e) {
            throw new RuntimeException("创建文件夹失败", e);
        }
        return flag;
    }

    /**
     * * 下载文件 *
     *
     * @param pathName FTP服务器文件目录 *
     * @param fileName 文件名称 *
     * @param savePath 下载后的文件路径 *
     */
    public boolean downloadFile(FTPClient ftpClient, String pathName, String fileName, String savePath) throws Exception {
        boolean flag;
        OutputStream os = null;
        try {
            log.info("开始下载文件");
            this.ftpClient = ftpClient;
            // 切换FTP目录
            changeWorkingDirectory(pathName);
            ftpClient.enterLocalPassiveMode();
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            FTPFile[] ftpFiles = ftpClient.listFiles();
            log.info("ftpFiles.length:{}",ftpFiles.length);
            for (FTPFile file : ftpFiles) {
                if (fileName.equalsIgnoreCase(file.getName())) {
                    File folder = new File(savePath);
                    // 判断文件夹是否存在
                    if (!folder.exists()) {
                        folder.mkdirs();
                }
                    os = new FileOutputStream(savePath + "/" + fileName);
                    log.info("lzdebt:下载中");
                    ftpClient.retrieveFile(file.getName(), os);
                    os.close();
                    log.info("lzdebt:下载结束");
                }
            }
            ftpClient.logout();
            flag = true;
            // 解压 ZIP 文件
            IOUtils.zipUncompress(savePath + "/" + fileName,savePath);
            log.info("下载文件成功");
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException e) {
                    throw new RuntimeException("下载文件失败", e);
                }
            }
            if (null != os) {
                try {
                    os.close();
                } catch (Exception e) {
                    throw new RuntimeException("下载文件失败", e);
                }
            }
        }
        return flag;
    }

    /**
     * * 删除文件 *
     *
     * @param pathName FTP服务器保存目录 *
     * @param fileName 要删除的文件名称 *
     * @return
     */
    public boolean deleteFile(FTPClient ftpClient, String pathName, String fileName) throws Exception {
        boolean flag;

        try {
            log.info("开始删除文件");
            this.ftpClient = ftpClient;
            // 切换FTP目录
            ftpClient.changeWorkingDirectory(pathName);
            ftpClient.dele(fileName);
            ftpClient.logout();
            flag = true;
            log.info("删除文件成功");
        } catch (Exception e) {
            throw new Exception("删除文件失败", e);
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException e) {
                    throw new Exception("删除文件失败", e);
                }
            }
        }
        return flag;
    }

}