<span style="font-family: Arial, Helvetica, sans-serif;">import java.io.BufferedReader;</span>

1. import java.io.FileOutputStream;

2. import java.io.IOException;

3. import java.io.InputStream;

4. import java.io.InputStreamReader;

5. import java.io.OutputStreamWriter;

6. import java.io.UnsupportedEncodingException;

7. import java.net.HttpURLConnection;

8. import java.net.Socket;

9. import java.net.URL;

10. import java.net.URLConnection;

11. import java.net.URLEncoder;

12. import java.util.ArrayList;

13. import java.util.HashMap;

14. import java.util.Iterator;

15. import java.util.List;

16. import java.util.Map;

17. import java.util.Map.Entry;

18. import org.apache.http.HttpResponse;

19. import org.apache.http.NameValuePair;

20. import org.apache.http.client.HttpClient;

21. import org.apache.http.client.entity.UrlEncodedFormEntity;

22. import org.apache.http.client.methods.HttpGet;

23. import org.apache.http.client.methods.HttpPost;

24. import org.apache.http.impl.client.DefaultHttpClient;

25. import org.apache.http.message.BasicNameValuePair;

26. /**

27. * @Description:傳送http請求幫助類

28. * @author:liuyc

29. * @time:2016年5月17日 下午3:25:32

30. */

31. public class HttpClientHelper {

32. /**

33. * @Description:使用HttpURLConnection傳送post請求

34. * @author:liuyc

35. * @time:2016年5月17日 下午3:26:07

36. */

37. public static String sendPost(String urlParam, Map<String, Object> params, String charset) {

38. StringBuffer resultBuffer = null;

39. // 構建請求引數

40. StringBuffer sbParams = new StringBuffer();

41. if (params != null && params.size() > 0) {

42. for (Entry<String, Object> e : params.entrySet()) {

43. sbParams.append(e.getKey());

44. sbParams.append("=");

45. sbParams.append(e.getValue());

46. sbParams.append("&");

47. }

48. }

49. HttpURLConnection con = null;

50. OutputStreamWriter osw = null;

51. BufferedReader br = null;

52. // 傳送請求

53. try {

54. URL url = new URL(urlParam);

55. con = (HttpURLConnection) url.openConnection();

56. con.setRequestMethod("POST");

57. con.setDoOutput(true);

58. con.setDoInput(true);

59. con.setUseCaches(false);

60. con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

61. if (sbParams != null && sbParams.length() > 0) {

62. osw = new OutputStreamWriter(con.getOutputStream(), charset);

63. osw.write(sbParams.substring(0, sbParams.length() - 1));

64. osw.flush();

65. }

66. // 讀取返回內容

67. resultBuffer = new StringBuffer();

68. int contentLength = Integer.parseInt(con.getHeaderField("Content-Length"));

69. if (contentLength > 0) {

70. br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset));

71. String temp;

72. while ((temp = br.readLine()) != null) {

73. resultBuffer.append(temp);

74. }

75. }

76. } catch (Exception e) {

77. throw new RuntimeException(e);

78. } finally {

79. if (osw != null) {

80. try {

81. osw.close();

82. } catch (IOException e) {

83. osw = null;

84. throw new RuntimeException(e);

85. } finally {

86. if (con != null) {

87. con.disconnect();

88. con = null;

89. }

90. }

91. }

92. if (br != null) {

93. try {

94. br.close();

95. } catch (IOException e) {

96. br = null;

97. throw new RuntimeException(e);

98. } finally {

99. if (con != null) {

100. con.disconnect();

101. con = null;

102. }

103. }

104. }

105. }

106. return resultBuffer.toString();

107. }

108. /**

109. * @Description:使用URLConnection傳送post

110. * @author:liuyc

111. * @time:2016年5月17日 下午3:26:52

112. */

113. public static String sendPost2(String urlParam, Map<String, Object> params, String charset) {

114. StringBuffer resultBuffer = null;

115. // 構建請求引數

116. StringBuffer sbParams = new StringBuffer();

117. if (params != null && params.size() > 0) {

118. for (Entry<String, Object> e : params.entrySet()) {

119. sbParams.append(e.getKey());

120. sbParams.append("=");

121. sbParams.append(e.getValue());

122. sbParams.append("&");

123. }

124. }

125. URLConnection con = null;

126. OutputStreamWriter osw = null;

127. BufferedReader br = null;

128. try {

129. URL realUrl = new URL(urlParam);

130. // 開啟和URL之間的連線

131. con = realUrl.openConnection();

132. // 設定通用的請求屬性

133. con.setRequestProperty("accept", "*/*");

134. con.setRequestProperty("connection", "Keep-Alive");

135. con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

136. con.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

137. // 傳送POST請求必須設定如下兩行

138. con.setDoOutput(true);

139. con.setDoInput(true);

140. // 獲取URLConnection物件對應的輸出流

141. osw = new OutputStreamWriter(con.getOutputStream(), charset);

142. if (sbParams != null && sbParams.length() > 0) {

143. // 傳送請求引數

144. osw.write(sbParams.substring(0, sbParams.length() - 1));

145. // flush輸出流的緩衝

146. osw.flush();

147. }

148. // 定義BufferedReader輸入流來讀取URL的響應

149. resultBuffer = new StringBuffer();

150. int contentLength = Integer.parseInt(con.getHeaderField("Content-Length"));

151. if (contentLength > 0) {

152. br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset));

153. String temp;

154. while ((temp = br.readLine()) != null) {

155. resultBuffer.append(temp);

156. }

157. }

158. } catch (Exception e) {

159. throw new RuntimeException(e);

160. } finally {

161. if (osw != null) {

162. try {

163. osw.close();

164. } catch (IOException e) {

165. osw = null;

166. throw new RuntimeException(e);

167. }

168. }

169. if (br != null) {

170. try {

171. br.close();

172. } catch (IOException e) {

173. br = null;

174. throw new RuntimeException(e);

175. }

176. }

177. }

178. return resultBuffer.toString();

179. }

180. /**

181. * @Description:傳送get請求儲存下載檔案

182. * @author:liuyc

183. * @time:2016年5月17日 下午3:27:29

184. */

185. public static void sendGetAndSaveFile(String urlParam, Map<String, Object> params, String fileSavePath) {

186. // 構建請求引數

187. StringBuffer sbParams = new StringBuffer();

188. if (params != null && params.size() > 0) {

189. for (Entry<String, Object> entry : params.entrySet()) {

190. sbParams.append(entry.getKey());

191. sbParams.append("=");

192. sbParams.append(entry.getValue());

193. sbParams.append("&");

194. }

195. }

196. HttpURLConnection con = null;

197. BufferedReader br = null;

198. FileOutputStream os = null;

199. try {

200. URL url = null;

201. if (sbParams != null && sbParams.length() > 0) {

202. url = new URL(urlParam + "?" + sbParams.substring(0, sbParams.length() - 1));

203. } else {

204. url = new URL(urlParam);

205. }

206. con = (HttpURLConnection) url.openConnection();

207. con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

208. con.connect();

209. InputStream is = con.getInputStream();

210. os = new FileOutputStream(fileSavePath);

211. byte buf[] = new byte[1024];

212. int count = 0;

213. while ((count = is.read(buf)) != -1) {

214. os.write(buf, 0, count);

215. }

216. os.flush();

217. } catch (Exception e) {

218. throw new RuntimeException(e);

219. } finally {

220. if (os != null) {

221. try {

222. os.close();

223. } catch (IOException e) {

224. os = null;

225. throw new RuntimeException(e);

226. } finally {

227. if (con != null) {

228. con.disconnect();

229. con = null;

230. }

231. }

232. }

233. if (br != null) {

234. try {

235. br.close();

236. } catch (IOException e) {

237. br = null;

238. throw new RuntimeException(e);

239. } finally {

240. if (con != null) {

241. con.disconnect();

242. con = null;

243. }

244. }

245. }

246. }

247. }

248. /**

249. * @Description:使用HttpURLConnection傳送get請求

250. * @author:liuyc

251. * @time:2016年5月17日 下午3:27:29

252. */

253. public static String sendGet(String urlParam, Map<String, Object> params, String charset) {

254. StringBuffer resultBuffer = null;

255. // 構建請求引數

256. StringBuffer sbParams = new StringBuffer();

257. if (params != null && params.size() > 0) {

258. for (Entry<String, Object> entry : params.entrySet()) {

259. sbParams.append(entry.getKey());

260. sbParams.append("=");

261. sbParams.append(entry.getValue());

262. sbParams.append("&");

263. }

264. }

265. HttpURLConnection con = null;

266. BufferedReader br = null;

267. try {

268. URL url = null;

269. if (sbParams != null && sbParams.length() > 0) {

270. url = new URL(urlParam + "?" + sbParams.substring(0, sbParams.length() - 1));

271. } else {

272. url = new URL(urlParam);

273. }

274. con = (HttpURLConnection) url.openConnection();

275. con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

276. con.connect();

277. resultBuffer = new StringBuffer();

278. br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset));

279. String temp;

280. while ((temp = br.readLine()) != null) {

281. resultBuffer.append(temp);

282. }

283. } catch (Exception e) {

284. throw new RuntimeException(e);

285. } finally {

286. if (br != null) {

287. try {

288. br.close();

289. } catch (IOException e) {

290. br = null;

291. throw new RuntimeException(e);

292. } finally {

293. if (con != null) {

294. con.disconnect();

295. con = null;

296. }

297. }

298. }

299. }

300. return resultBuffer.toString();

301. }

302. /**

303. * @Description:使用URLConnection傳送get請求

304. * @author:liuyc

305. * @time:2016年5月17日 下午3:27:58

306. */

307. public static String sendGet2(String urlParam, Map<String, Object> params, String charset) {

308. StringBuffer resultBuffer = null;

309. // 構建請求引數

310. StringBuffer sbParams = new StringBuffer();

311. if (params != null && params.size() > 0) {

312. for (Entry<String, Object> entry : params.entrySet()) {

313. sbParams.append(entry.getKey());

314. sbParams.append("=");

315. sbParams.append(entry.getValue());

316. sbParams.append("&");

317. }

318. }

319. BufferedReader br = null;

320. try {

321. URL url = null;

322. if (sbParams != null && sbParams.length() > 0) {

323. url = new URL(urlParam + "?" + sbParams.substring(0, sbParams.length() - 1));

324. } else {

325. url = new URL(urlParam);

326. }

327. URLConnection con = url.openConnection();

328. // 設定請求屬性

329. con.setRequestProperty("accept", "*/*");

330. con.setRequestProperty("connection", "Keep-Alive");

331. con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

332. con.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

333. // 建立連線

334. con.connect();

335. resultBuffer = new StringBuffer();

336. br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset));

337. String temp;

338. while ((temp = br.readLine()) != null) {

339. resultBuffer.append(temp);

340. }

341. } catch (Exception e) {

342. throw new RuntimeException(e);

343. } finally {

344. if (br != null) {

345. try {

346. br.close();

347. } catch (IOException e) {

348. br = null;

349. throw new RuntimeException(e);

350. }

351. }

352. }

353. return resultBuffer.toString();

354. }

355. /**

356. * @Description:使用HttpClient傳送post請求

357. * @author:liuyc

358. * @time:2016年5月17日 下午3:28:23

359. */

360. public static String httpClientPost(String urlParam, Map<String, Object> params, String charset) {

361. StringBuffer resultBuffer = null;

362. HttpClient client = new DefaultHttpClient();

363. HttpPost httpPost = new HttpPost(urlParam);

364. // 構建請求引數

365. List<NameValuePair> list = new ArrayList<NameValuePair>();

366. Iterator<Entry<String, Object>> iterator = params.entrySet().iterator();

367. while (iterator.hasNext()) {

368. Entry<String, Object> elem = iterator.next();

369. list.add(new BasicNameValuePair(elem.getKey(), String.valueOf(elem.getValue())));

370. }

371. BufferedReader br = null;

372. try {

373. if (list.size() > 0) {

374. UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, charset);

375. httpPost.setEntity(entity);

376. }

377. HttpResponse response = client.execute(httpPost);

378. // 讀取伺服器響應資料

379. resultBuffer = new StringBuffer();

380. br = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

381. String temp;

382. while ((temp = br.readLine()) != null) {

383. resultBuffer.append(temp);

384. }

385. } catch (Exception e) {

386. throw new RuntimeException(e);

387. } finally {

388. if (br != null) {

389. try {

390. br.close();

391. } catch (IOException e) {

392. br = null;

393. throw new RuntimeException(e);

394. }

395. }

396. }

397. return resultBuffer.toString();

398. }

399. /**

400. * @Description:使用HttpClient傳送get請求

401. * @author:liuyc

402. * @time:2016年5月17日 下午3:28:56

403. */

404. public static String httpClientGet(String urlParam, Map<String, Object> params, String charset) {

405. StringBuffer resultBuffer = null;

406. HttpClient client = new DefaultHttpClient();

407. BufferedReader br = null;

408. // 構建請求引數

409. StringBuffer sbParams = new StringBuffer();

410. if (params != null && params.size() > 0) {

411. for (Entry<String, Object> entry : params.entrySet()) {

412. sbParams.append(entry.getKey());

413. sbParams.append("=");

414. try {

415. sbParams.append(URLEncoder.encode(String.valueOf(entry.getValue()), charset));

416. } catch (UnsupportedEncodingException e) {

417. throw new RuntimeException(e);

418. }

419. sbParams.append("&");

420. }

421. }

422. if (sbParams != null && sbParams.length() > 0) {

423. urlParam = urlParam + "?" + sbParams.substring(0, sbParams.length() - 1);

424. }

425. HttpGet httpGet = new HttpGet(urlParam);

426. try {

427. HttpResponse response = client.execute(httpGet);

428. // 讀取伺服器響應資料

429. br = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

430. String temp;

431. resultBuffer = new StringBuffer();

432. while ((temp = br.readLine()) != null) {

433. resultBuffer.append(temp);

434. }

435. } catch (Exception e) {

436. throw new RuntimeException(e);

437. } finally {

438. if (br != null) {

439. try {

440. br.close();

441. } catch (IOException e) {

442. br = null;

443. throw new RuntimeException(e);

444. }

445. }

446. }

447. return resultBuffer.toString();

448. }

449. /**

450. * @Description:使用socket傳送post請求

451. * @author:liuyc

452. * @time:2016年5月18日 上午9:26:22

453. */

454. public static String sendSocketPost(String urlParam, Map<String, Object> params, String charset) {

455. String result = "";

456. // 構建請求引數

457. StringBuffer sbParams = new StringBuffer();

458. if (params != null && params.size() > 0) {

459. for (Entry<String, Object> entry : params.entrySet()) {

460. sbParams.append(entry.getKey());

461. sbParams.append("=");

462. sbParams.append(entry.getValue());

463. sbParams.append("&");

464. }

465. }

466. Socket socket = null;

467. OutputStreamWriter osw = null;

468. InputStream is = null;

469. try {

470. URL url = new URL(urlParam);

471. String host = url.getHost();

472. int port = url.getPort();

473. if (-1 == port) {

474. port = 80;

475. }

476. String path = url.getPath();

477. socket = new Socket(host, port);

478. StringBuffer sb = new StringBuffer();

479. sb.append("POST " + path + " HTTP/1.1\r\n");

480. sb.append("Host: " + host + "\r\n");

481. sb.append("Connection: Keep-Alive\r\n");

482. sb.append("Content-Type: application/x-www-form-urlencoded; charset=utf-8 \r\n");

483. sb.append("Content-Length: ").append(sb.toString().getBytes().length).append("\r\n");

484. // 這裡一個回車換行，表示訊息頭寫完，不然伺服器會繼續等待

485. sb.append("\r\n");

486. if (sbParams != null && sbParams.length() > 0) {

487. sb.append(sbParams.substring(0, sbParams.length() - 1));

488. }

489. osw = new OutputStreamWriter(socket.getOutputStream());

490. osw.write(sb.toString());

491. osw.flush();

492. is = socket.getInputStream();

493. String line = null;

494. // 伺服器響應體資料長度

495. int contentLength = 0;

496. // 讀取http響應頭部資訊

497. do {

498. line = readLine(is, 0, charset);

499. if (line.startsWith("Content-Length")) {

500. // 拿到響應體內容長度

501. contentLength = Integer.parseInt(line.split(":")[1].trim());

502. }

503. // 如果遇到了一個單獨的回車換行，則表示請求頭結束

504. } while (!line.equals("\r\n"));

505. // 讀取出響應體資料（就是你要的資料）

506. result = readLine(is, contentLength, charset);

507. } catch (Exception e) {

508. throw new RuntimeException(e);

509. } finally {

510. if (osw != null) {

511. try {

512. osw.close();

513. } catch (IOException e) {

514. osw = null;

515. throw new RuntimeException(e);

516. } finally {

517. if (socket != null) {

518. try {

519. socket.close();

520. } catch (IOException e) {

521. socket = null;

522. throw new RuntimeException(e);

523. }

524. }

525. }

526. }

527. if (is != null) {

528. try {

529. is.close();

530. } catch (IOException e) {

531. is = null;

532. throw new RuntimeException(e);

533. } finally {

534. if (socket != null) {

535. try {

536. socket.close();

537. } catch (IOException e) {

538. socket = null;

539. throw new RuntimeException(e);

540. }

541. }

542. }

543. }

544. }

545. return result;

546. }

547. /**

548. * @Description:使用socket傳送get請求

549. * @author:liuyc

550. * @time:2016年5月18日 上午9:27:18

551. */

552. public static String sendSocketGet(String urlParam, Map<String, Object> params, String charset) {

553. String result = "";

554. // 構建請求引數

555. StringBuffer sbParams = new StringBuffer();

556. if (params != null && params.size() > 0) {

557. for (Entry<String, Object> entry : params.entrySet()) {

558. sbParams.append(entry.getKey());

559. sbParams.append("=");

560. sbParams.append(entry.getValue());

561. sbParams.append("&");

562. }

563. }

564. Socket socket = null;

565. OutputStreamWriter osw = null;

566. InputStream is = null;

567. try {

568. URL url = new URL(urlParam);

569. String host = url.getHost();

570. int port = url.getPort();

571. if (-1 == port) {

572. port = 80;

573. }

574. String path = url.getPath();

575. socket = new Socket(host, port);

576. StringBuffer sb = new StringBuffer();

577. sb.append("GET " + path + " HTTP/1.1\r\n");

578. sb.append("Host: " + host + "\r\n");

579. sb.append("Connection: Keep-Alive\r\n");

580. sb.append("Content-Type: application/x-www-form-urlencoded; charset=utf-8 \r\n");

581. sb.append("Content-Length: ").append(sb.toString().getBytes().length).append("\r\n");

582. // 這裡一個回車換行，表示訊息頭寫完，不然伺服器會繼續等待

583. sb.append("\r\n");

584. if (sbParams != null && sbParams.length() > 0) {

585. sb.append(sbParams.substring(0, sbParams.length() - 1));

586. }

587. osw = new OutputStreamWriter(socket.getOutputStream());

588. osw.write(sb.toString());

589. osw.flush();

590. is = socket.getInputStream();

591. String line = null;

592. // 伺服器響應體資料長度

593. int contentLength = 0;

594. // 讀取http響應頭部資訊

595. do {

596. line = readLine(is, 0, charset);

597. if (line.startsWith("Content-Length")) {

598. // 拿到響應體內容長度

599. contentLength = Integer.parseInt(line.split(":")[1].trim());

600. }

601. // 如果遇到了一個單獨的回車換行，則表示請求頭結束

602. } while (!line.equals("\r\n"));

603. // 讀取出響應體資料（就是你要的資料）

604. result = readLine(is, contentLength, charset);

605. } catch (Exception e) {

606. throw new RuntimeException(e);

607. } finally {

608. if (osw != null) {

609. try {

610. osw.close();

611. } catch (IOException e) {

612. osw = null;

613. throw new RuntimeException(e);

614. } finally {

615. if (socket != null) {

616. try {

617. socket.close();

618. } catch (IOException e) {

619. socket = null;

620. throw new RuntimeException(e);

621. }

622. }

623. }

624. }

625. if (is != null) {

626. try {

627. is.close();

628. } catch (IOException e) {

629. is = null;

630. throw new RuntimeException(e);

631. } finally {

632. if (socket != null) {

633. try {

634. socket.close();

635. } catch (IOException e) {

636. socket = null;

637. throw new RuntimeException(e);

638. }

639. }

640. }

641. }

642. }

643. return result;

644. }

645. /**

646. * @Description:讀取一行資料，contentLe內容長度為0時，讀取響應頭資訊，不為0時讀正文

647. * @time:2016年5月17日 下午6:11:07

648. */

649. private static String readLine(InputStream is, int contentLength, String charset) throws IOException {

650. List<Byte> lineByte = new ArrayList<Byte>();

651. byte tempByte;

652. int cumsum = 0;

653. if (contentLength != 0) {

654. do {

655. tempByte = (byte) is.read();

656. lineByte.add(Byte.valueOf(tempByte));

657. cumsum++;

658. } while (cumsum < contentLength);// cumsum等於contentLength表示已讀完

659. } else {

660. do {

661. tempByte = (byte) is.read();

662. lineByte.add(Byte.valueOf(tempByte));

663. } while (tempByte != 10);// 換行符的ascii碼值為10

664. }

665. byte[] resutlBytes = new byte[lineByte.size()];

666. for (int i = 0; i < lineByte.size(); i++) {

667. resutlBytes[i] = (lineByte.get(i)).byteValue();

668. }

669. return new String(resutlBytes, charset);

670. }

671. }

以上4種分別可傳送get和post請求的方法，第1種：HttpURLConnection、第2種：URLConnection、第3種：HttpClient、第4種：Socket，朋友們要注意的是，使用第3種HttpClient時需要依賴於三個jar包，分別是：apache-httpcomponents-httpclient.jar、commons-logging-1.0.4.jar、httpcore-4.1.1.jar。好了就到這裡吧，有問題記得留言哦