QT程序FTP服务器

系统教程580 更新时间：2026-04-05 10:03:32

2023年12月29日发(作者：)

QT程序FTP服务器

12级电子新能源本2班

2

张恒

一、 QT简介

QT是一个跨平台的C++图形化用户界面的应用程序开发框架。它既可以开发GUI程序，也用于开发非GUI程序，比如控制台工具和服务器。在QT Creator 3.1.0正式发布后，QT实现了对IOS、Android、WP的全面支持。

二、 FTP服务器

FTP是文件传输协议的英文简称，用于Internet上的控制文件的双向传输。同多数Internet服务器一样，FTP也是分为两部分，即客户端程序与服务器系统。本次所做出的图形化界面程序为FTP的客户端程序。

三、程序介绍

1. UI介绍

FTP客户端程序的UI界面是图所示，在UI中主要由连接、上传、下载、退出、返回、FTP地址、用户名、密码等组成，并且在下方留出大窗口用于显示FTP服务器中的文件。

2. 程序源代码介绍

3. #include "ftp.h"

4. #include "ui_ftp.h"

5.

6. Ftp::Ftp(QWidget *parent)

7. : QWidget(parent), ui(new Ui::Ftp), ftpobj(0)

8. {

9. ui->setupUi(this);

10. //ui->lineEdit->setText("");

11. //ui->comboBox->addItem("192.168.1.253");

12. ui->lineEdit_3->setEchoMode(QLineEdit::Password);

13. //ui->treeWidget->setAcceptDrops(true);

14. this->setAcceptDrops(true);

15. //model = new QDirModel;

16. //ui->treeView->setModel(model);

17. //ui->treeView->setAcceptDrops(true);

18.

19. ui->label_2->setText(tr("Please enter the name of an FTP server."));

20. ui->lineEdit_2->setText("");

21. ui->lineEdit_3->setText("");

22.

23. ui->treeWidget->setEnabled(false);

24. ui->treeWidget->setRootIsDecorated(false);

25. //ui->treeWidget->setHeaderLabels(QStringList() <

<

26. ui->treeWidget->header()->setStretchLastSection(false);

27.

28. ui->pushButton_2->setDefault(true);

29. ui->pushButton->setEnabled(false);

30. ui->radioButton_2->setChecked(true);

31. ui->pushButton_3->setEnabled(false);

32. progressDialog = new QProgressDialog(this);

33.

34. connect(ui->checkBox, SIGNAL(clicked()), this, SLOT(enableCheckBox()));

35. connect(ui->treeWidget, SIGNAL(itemActivated(QTreeWidgetItem *, int)),

36. this, SLOT(processItem(QTreeWidgetItem *, int)));

37. connect(ui->treeWidget, SIGNAL(currentItemChanged(QTreeWidgetItem *,

QTreeWidgetItem *)),

38. this, SLOT(enableDownloadButton()));

39. connect(progressDialog, SIGNAL(canceled()), this, SLOT(cancelDownload()));

40. connect(ui->pushButton_2, SIGNAL(clicked()), this, SLOT(connectOrDisconnect()));

41. connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(cdToParent()));

42. connect(ui->pushButton_3, SIGNAL(clicked()), this, SLOT(downloadFile()));

43. connect(ui->pushButton_4, SIGNAL(clicked()), this, SLOT(close()));

44. connect(ui->pushButton_5, SIGNAL(clicked()), this, SLOT(uploadFile()));

45. //红色代码用于设置信号槽，定义了PushButton、PushButton_2、PushButton_3等按钮的使用

46. setWindowTitle(tr("FTP"));

47. }

48.

49. Ftp::~Ftp()

50. {

51. delete ui;

52. }

53.

54.

55. QSize Ftp::sizeHint() const

56. {

57. return QSize(500, 300);

58. }

59.

60. //![0]

61. void Ftp::connectOrDisconnect()

62. {

63. if(!ui->checkBox->isChecked()){

64. if(ui->lineEdit_2->text().isEmpty()||ui->lineEdit_3->text().isEmpty())

65. {

66. QMessageBox::information(this, tr("FTP"),tr("请检查ftp账号信息，用户名和密码都不允许为空。"));

67. return ;

68. }

69. }

70. //上述代码用来判断用户输入的用户名与密码是否可以登录ftp服务器

71.

72. if (ftpobj) {

73. ftpobj->abort();

74. ftpobj->deleteLater();

75. ftpobj = 0;

76. //![0]

77. ui->lineEdit_2->setEnabled(true);

78. ui->lineEdit_3->setEnabled(true);

79. ui->checkBox->setEnabled(true);

80. ui->treeWidget->setEnabled(false);

81. ui->pushButton->setEnabled(false);

82. ui->pushButton_3->setEnabled(false);

83. ui->pushButton_2->setEnabled(true);

84. ui->pushButton_2->setText(tr("Connect"));

85. ui->comboBox->setEditable(true);

86. ui->checkBox->setChecked(false);

87. #ifndef QT_NO_CURSOR

88. setCursor(Qt::ArrowCursor);

89. #endif

90. return;

91. }

92.

93. #ifndef QT_NO_CURSOR

94. setCursor(Qt::WaitCursor);

95. #endif

96.

97. ui->comboBox->setEditable(false);

98. ui->lineEdit_2->setEnabled(false);

99. ui->lineEdit_3->setEnabled(false);

100. ui->checkBox->setEnabled(false);

101. ui->treeWidget->setEnabled(true);

102. ui->pushButton_2->setEnabled(false);

103.

104. //![1]

105. ftpobj = new QFtp(this);

106.

107. connect(ftpobj, SIGNAL(commandFinished(int, bool)),

108. this, SLOT(ftpCommandFinished(int, bool)));

109. connect(ftpobj, SIGNAL(listInfo(constQUrlInfo&)),

110. this, SLOT(addToList(constQUrlInfo&)));

111. connect(ftpobj, SIGNAL(dataTransferProgress(qint64, qint64)),

112. this, SLOT(updateDataTransferProgress(qint64, qint64)));

113.

114. ui->treeWidget->clear();

115. ();

116. ();

117. //![1]

118.

119. //![2]

120. QUrlurl(ui->comboBox->currentText());

121. if (!d() || ().toLower() != QLatin1String("ftp")) {

122. ftpobj->connectToHost(ui->comboBox->currentText(), 21);

123. if(ui->checkBox->isChecked())

124. ftpobj->login();

125. else

126. ftpobj->login(ui->lineEdit_2->text(),ui->lineEdit_3->text());

127. } else {

128. ftpobj->connectToHost((), (21));

129.

130. /*if (!me().isEmpty())

131. //ftpobj->login(QUrl::fromPercentEncoding(me().toLatin1()),

rd());

132. ftpobj->login("company","123456");

133. else

134. ftpobj->login("company","123456");*/

135.

136. if(ui->checkBox->isChecked())

137. ftpobj->login();

138. else

139. ftpobj->login(ui->lineEdit_2->text(),ui->lineEdit_3->text());

140.

141. if (!().isEmpty())

142. ftpobj->cd(());

143. }

144. if( ui->radioButton_2->isChecked() )

145. ftpobj->setTransferMode(QFtp::Active);

146. else

147. ftpobj->setTransferMode(QFtp::Passive);

148. //![2]

149.

150. ui->label_2->setText(tr("Connecting to FTP server %1...")

151. .arg(ui->comboBox->currentText()));

152.

153. }

154.

155. //![3]

156. void Ftp::downloadFile()

157. {

158. QStringfileNam = ui->treeWidget->currentItem()->text(0);

159. //![3]

160. //

161. QStringfileName = QFileDialog::getExistingDirectory(this, tr("保存到。。。"),

162. ".",

163. QFileDialog::ShowDirsOnly

164. |

QFileDialog::DontResolveSymlinks);

165. if(()) return;

166.

167. fileName += "/";

168. fileName += fileNam;

169. if (QFile::exists(fileName)) {

170. int answer = QMessageBox::question(this,tr("FTP"),

171. tr("同名文件 %1已经存在，需要覆盖吗?").arg(fileName),

172. QMessageBox::Yes|QMessageBox::No);

173. if(answer == QMessageBox::Yes){

174. QDirdir(fileName);

175. (fileName);

176. }

177. if(answer == QMessageBox::No) return;

178. }

179. //![4]

180. file = new QFile(fileName);

181. if (!file->open(QIODevice::WriteOnly)) {

182. QMessageBox::information(this, tr("FTP"),

183. tr("Unable to save the file %1: %2.")

184. .arg(fileName).arg(file->errorString()));

185. delete file;

186. return;

187. }

188.

189. ftpobj->get(ui->treeWidget->currentItem()->text(0), file);

190.

191. progressDialog->setLabelText(tr("Downloading %1...").arg(fileName));

192. ui->pushButton_3->setEnabled(false);

193. progressDialog->exec();

194. }

195. //![4]

196. void Ftp::uploadFile()

197. {

198. // QStringDirName = ui->treeWidget->currentItem()->text(0);

199. //![3]

200. //

201. QStringfileName = QFileDialog::getOpenFileName(this, tr("打开文件。。。"),

202. ".",

203. "*");

204. if(()) return;

205.

206.

207. if (!QFile::exists(fileName)) {

208. return;

209. }

210. //![4]

211. file_upload = new QFile(fileName);

212. if (!file_upload->open(QIODevice::ReadOnly)) {

213. QMessageBox::information(this, tr("FTP"),

214. tr("Unable to open the file %1: %2.")

215. .arg(fileName).arg(file_upload->errorString()));

216. //delete file_upload;

217. return;

218. }

219.

220. //ftpobj->get(ui->treeWidget->currentItem()->text(0), file);

221. ftpobj->put(file_upload,fileName);

222. progressDialog->setLabelText(tr("Uploading %1...").arg(fileName));

223. progressDialog->exec();

224. }

225. //![5]

226. void Ftp::cancelDownload()

227. {

228. ftpobj->abort();

229. }

230. //![5]

231. //![6]

232. void Ftp::ftpCommandFinished(int, bool error)

233. {

234. #ifndef QT_NO_CURSOR

235. setCursor(Qt::ArrowCursor);

236. #endif

237.

238. if (ftpobj->currentCommand() == QFtp::ConnectToHost) {

239. if (error) {

240. QMessageBox::information(this, tr("FTP"),

241. tr("Unable to connect to the FTP server "

242. "at %1. Please check that the host "

243. "name is correct.")

244. .arg(ui->comboBox->currentText()));

245. connectOrDisconnect();

246. return;

247. }

248. ui->label_2->setText(tr("Logged onto %1.")

249. .arg(ui->comboBox->currentText()));

250. ui->treeWidget->setFocus();

251. ui->pushButton_3->setDefault(true);

252. ui->pushButton_2->setEnabled(true);

253. return;

254. }

255. //![6]

256. //![7]

257. if (ftpobj->currentCommand() == QFtp::Login)

258. ftpobj->list();

259. //![7]

260. //![8]

261. if (ftpobj->currentCommand() == QFtp::Get) {

262. if (error) {

263. ui->label_2->setText(tr("Canceled download of %1.")

264. .arg(file->fileName()));

265. file->close();

266. file->remove();

267. } else {

268. ui->label_2->setText(tr("Downloaded %1 to current directory.")

269. .arg(file->fileName()));

270. file->close();

271. }

272. delete file;

273. enableDownloadButton();

274. progressDialog->hide();

275. //![8]

276. //![9]

277. } else if (ftpobj->currentCommand() == QFtp::List) {

278. if (y()) {

279. ui->treeWidget->addTopLevelItem(new QTreeWidgetItem(QStringList() <")));

280. ui->treeWidget->setEnabled(false);

281. }

282. }

283. //![9]

284. }

285. //![10]

286. void Ftp::addToList(const QUrlInfo&urlInfo)

287. {

288. QTreeWidgetItem *item = new QTreeWidgetItem;

289. item->setText(0, ());

290. item->setText(1, QString::number(()));

291. item->setText(2, ());

292. item->setText(3, ());

293. item->setText(4, dified().toString("MMM ddyyyy"));

294.

295. QPixmappixmap(() ? ":/images/" : ":/images/");

296. item->setIcon(0, pixmap);

297.

298. isDirectory[()] = ();

299. ui->treeWidget->addTopLevelItem(item);

300. if (!ui->treeWidget->currentItem()) {

301. ui->treeWidget->setCurrentItem(ui->treeWidget->topLevelItem(0));

302. ui->treeWidget->setEnabled(true);

303. }

304. }

305. //![10]

306. //![11]

307. void Ftp::processItem(QTreeWidgetItem *item, int /*column*/)

308. {

309. QString name = item->text(0);

310. if ((name)) {

311. ui->treeWidget->clear();

312. ();

313. currentPath += "/" + name;

314. ftpobj->cd(name);

315. ftpobj->list();

316. ui->pushButton->setEnabled(true);

317. #ifndef QT_NO_CURSOR

318. setCursor(Qt::WaitCursor);

319. #endif

320. return;

321. }

322. }

323. //![11]

324. //![12]

325. void Ftp::cdToParent()

326. {

327. #ifndef QT_NO_CURSOR

328. setCursor(Qt::WaitCursor);

329. #endif

330. ui->treeWidget->clear();

331. ();

332. currentPath = (dexOf('/'));

333. if (y()) {

334. ui->pushButton->setEnabled(false);

335. ftpobj->cd("/");

336. } else {

337. ftpobj->cd(currentPath);

338. }

339. ftpobj->list();

340. }

341. //![12]

342. //![13]

343. void Ftp::updateDataTransferProgress(qint64 readBytes,

344. qint64 totalBytes)

345. {

346. progressDialog->setMaximum(totalBytes);

347. progressDialog->setValue(readBytes);

348. }

349. //![13]

350. //![14]

351. void Ftp::enableDownloadButton()

352. {

353. QTreeWidgetItem *current = ui->treeWidget->currentItem();

354. if (current) {

355. QStringcurrentFile = current->text(0);

356. ui->pushButton_3->setEnabled(!(currentFile));

357. } else {

358. ui->pushButton_3->setEnabled(false);

359. }

360. }

361. //![14]

362.

363. void Ftp::enableCheckBox()

364. {

365.

366. if (ui->checkBox->isChecked()) {

367. ui->lineEdit_2->setEnabled(false);

368. ui->lineEdit_3->setEnabled(false);

369. } else {

370. ui->lineEdit_2->setEnabled(true);

371. ui->lineEdit_3->setEnabled(true);

372. }

373. }

374. /*

375. void Ftp::mousePressEvent(QMouseEvent *event)

376. {

377. if (event->button() == Qt::LeftButton)

378. startPos = event->pos();

379. QWidget::mousePressEvent(event);

380. }

381.

382. void Ftp::mouseMoveEvent(QMouseEvent *event)

383. {

384. if (event->buttons() &Qt::LeftButton) {

385. int distance = (event->pos() - startPos).manhattanLength();

386. if (distance >= QApplication::startDragDistance())

387. downloadFiles();

388. }

389. QWidget::mouseMoveEvent(event);

390. }

391.

392. void Ftp::dragEnterEvent(QDragEnterEvent *event)

393. {

394. Ftp *source =

395. qobject_cast(event->source());

396. if (source && source != this) {

397. event->setDropAction(Qt::MoveAction);

398. event->accept();

399. }

400. }

401. void Ftp::dragMoveEvent(QDragMoveEvent *event)

402. {

403. Ftp *source =

404. qobject_cast(event->source());

405. if (source && source != this) {

406. event->setDropAction(Qt::MoveAction);

407. event->accept();

408. }

409. }

410. void Ftp::dropEvent(QDropEvent *event)

411. {

412. Ftp *source =

413. qobject_cast(event->source());

414. if (source && source != this) {

415. //addItem(event->mimeData()->text());

416. event->setDropAction(Qt::MoveAction);

417. event->accept();

418. }

419. }

420. */

3.运行效果图

左图显示为FTP客户端开始在FTP服务器上下载文件

本文发布于:2023-12-29，感谢您对本站的认可！

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