java连接FTP下载文件

            commons-net
            commons-net
            3.1
        
        
            commons-io
            commons-io
            2.6
        

    public static void downloadFtpFile(String ftpIp, String ftpUserName, String ftpPassword,int ftpPort, String ftpPath, String localPath,String fileName){
        FTPClient ftpClient = null;
        try {
            ftpClient = getFTPClient(ftpIp,ftpUserName,ftpPassword,ftpPort);
            ftpClient.setControlEncoding("UTP-8");
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            ftpClient.enterLocalActiveMode();
            ftpClient.changeWorkingDirectory(ftpPath);

            //判断本地路径是否存在，不存在进行创建
            File file1 = new File(localPath);
            if (!file1.exists()){
                file1.mkdirs();
            }

            //把文件写入到本地路径
            File localFile = new File(localPath + fileName);
            OutputStream os = new FileOutputStream(localFile);
            ftpClient.retrieveFile(fileName,os);
            os.close();
            ftpClient.logout();
        }catch (FileNotFoundException e){
            System.out.println("没有找到文件");
            log.error("没有找到要下载的文件");
        } catch (SocketException e) {
            System.out.println("连接失败");
            log.error("连接下载文件的FTP失败");
        }catch (IOException e){
            System.out.println("读写异常");
            log.error("读写文件异常");
        }
    }




    public static FTPClient getFTPClient(String ftpIp,String ftpUserName, String ftpPassword,int ftpPort){
        FTPClient ftpClient = new FTPClient();
        try{
            ftpClient = new FTPClient();
            ftpClient.connect(ftpIp,ftpPort);
            ftpClient.login(ftpUserName,ftpPassword);
            if (!FTPReply.isPositiveCompletion(ftpClient.getReplyCode())){
                System.out.println("未连接到FTP");
            }else {
                System.out.println("连接成功");
            }
        }catch (SocketException e){
            e.printStackTrace();
            log.error("连接下载文件的FTP失败");
        } catch (IOException e) {
            e.printStackTrace();
        }
        return ftpClient;
    }