android上传文件至服务器

class FileUploadTask extends AsyncTask<Object, Integer, String> {

		// private ProgressDialog dialog = null;
		Dialog dialog = new Dialog(PhotoUploadActivity.this,
				R.style.ProgressBarDialog);

		String BOUNDARY = UUID.randomUUID().toString(); // 边界标识 随机生成
		String PREFIX = "--", LINE_END = "\r\n";
		String CONTENT_TYPE = "multipart/form-data"; // 内容类型

		File uploadFile = new File(filePath);
		long totalSize = uploadFile.length(); // Get size of file, bytes

		ProgressBar mProgress;
		TextView mProgress_txt;

		@Override
		protected void onPreExecute() {
			/*
			 * dialog = new ProgressDialog(PhotoUploadActivity.this);
			 * dialog.setTitle("正在上传...");
			 * dialog.setMessage("0k/"+totalSize/1000+"k");
			 * dialog.setIndeterminate(false);
			 * dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
			 * dialog.setProgress(0); dialog.show();
			 */

			dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
			dialog.setContentView(R.layout.dialog_photo_progressbar);
			dialog.setCancelable(true);
			DisplayMetrics dm = PhotoUploadActivity.this
					.getApplicationContext().getResources().getDisplayMetrics();
			int width = dm.widthPixels;
			WindowManager.LayoutParams params = dialog.getWindow()
					.getAttributes();
			params.width = 9 * width / 10;
			dialog.getWindow().setAttributes(params);
			mProgress = (ProgressBar) dialog
					.findViewById(R.id.progress_horizontal);
			mProgress_txt = (TextView) dialog.findViewById(R.id.progress_txt);
			mProgress.setMax(100);
			mProgress.setProgress(0);
			mProgress.setIndeterminate(false);
			dialog.setCancelable(false);// 设置这个对话框不能被用户按[返回键]而取消掉,但测试发现如果用户按了KeyEvent.KEYCODE_SEARCH,对话框还是会Dismiss掉
			// 由于设置alertDialog.setCancelable(false);
			// 发现如果用户按了KeyEvent.KEYCODE_SEARCH,对话框还是会Dismiss掉,这里的setOnKeyListener作用就是屏蔽用户按下KeyEvent.KEYCODE_SEARCH
			dialog.setOnKeyListener(new DialogInterface.OnKeyListener() {
				public boolean onKey(DialogInterface dialog, int keyCode,
						KeyEvent event) {
					if (keyCode == KeyEvent.KEYCODE_SEARCH) {
						return true;
					} else {
						return false; // 默认返回 false
					}
				}
			});
			dialog.show();
			dialog.getWindow()
					.setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
		}

		@Override
		protected String doInBackground(Object... arg0) {
			String result = "";
			long length = 0;
			int progress;
			int bytesRead, bytesAvailable, bufferSize;
			byte[] buffer;
			int maxBufferSize = 10 * 1024;// 10KB

			try {
				URL url = new URL(actionUrl);
				HttpURLConnection conn = (HttpURLConnection) url
						.openConnection();
				// Set size of every block for post
				conn.setChunkedStreamingMode(128 * 1024);// 128KB
				conn.setReadTimeout(TIME_OUT);
				conn.setConnectTimeout(TIME_OUT);
				conn.setDoInput(true); // 允许输入流
				conn.setDoOutput(true); // 允许输出流
				conn.setUseCaches(false); // 不允许使用缓存
				conn.setRequestMethod("POST"); // 请求方式
				conn.setRequestProperty("Charset", CHARSET); // 设置编码
				conn.setRequestProperty("connection", "keep-alive");
				conn.setRequestProperty("Content-Type", CONTENT_TYPE
						+ ";boundary=" + BOUNDARY);

				if (uploadFile != null) {

					/**
					 * 当文件不为空，把文件包装并且上传
					 */
					DataOutputStream dos = new DataOutputStream(conn
							.getOutputStream());
					StringBuffer sb = new StringBuffer();
					sb.append(PREFIX);
					sb.append(BOUNDARY);
					sb.append(LINE_END);
					/**
					 * 这里重点注意： name里面的值为服务端需要key 只有这个key 才可以得到对应的文件
					 * filename是文件的名字，包含后缀名的 比如:abc.png
					 */

					sb.append("Content-Disposition: form-data; name=\"myFile\"; filename=\"" + java.net.URLEncoder.encode(uploadFile
									.getName(), "UTF-8") + "\"" + LINE_END);
					sb.append("Content-Type: application/octet-stream; charset="+ CHARSET + LINE_END);
					sb.append(LINE_END);

					dos.write(sb.toString().getBytes());
					InputStream is = new FileInputStream(uploadFile);
					bytesAvailable = is.available();
					bufferSize = Math.min(bytesAvailable, maxBufferSize);// 设置每次写入的大小
					buffer = new byte[bufferSize];
					// Read file
					bytesRead = is.read(buffer, 0, bufferSize);

					while (bytesRead > 0) {
						dos.write(buffer, 0, bufferSize);
						length += bufferSize;
						Thread.sleep(500);
						progress = (int) ((length * 100) / totalSize);
						publishProgress(progress, (int) length);

						bytesAvailable = is.available();
						bufferSize = Math.min(bytesAvailable, maxBufferSize);
						bytesRead = is.read(buffer, 0, bufferSize);
					}
					byte[] bytes = new byte[1024];
					int len = 0;
					while ((len = is.read(bytes)) != -1) {
						dos.write(bytes, 0, len);
					}
					is.close();
					dos.write(LINE_END.getBytes());
					// 请求结束标志
					byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END)
							.getBytes();
					dos.write(end_data);
					dos.flush();
					publishProgress(100, (int) length);
					/**
					 * 获取响应码 200=成功 当响应成功，获取响应的流
					 */
					int res = conn.getResponseCode();
					Log.e(TAG, "response code:" + res);
					if (res == 200) {
						Log.e(TAG, "request success");
						InputStream input = conn.getInputStream();
						StringBuffer sb1 = new StringBuffer();
						int ss;
						while ((ss = input.read()) != -1) {
							sb1.append((char) ss);
						}
						result = sb1.toString();
						Log.e(TAG, "result : " + result + "fffff"
								+ new File(filePath).getName() + "呵呵呵" + sb1);
					} else {
						Log.e(TAG, "request error");
					}
				}
			} catch (Exception ex) {

			}
			return result;
		}

		@Override
		protected void onProgressUpdate(Integer... progress) {
			// dialog.setProgress(progress[0]);
			// dialog.setMessage(progress[1]/1000+"k/"+totalSize/1000+"k");
			Log.i(TAG, "已经上传----->" + progress[1] / 1000 + "k/" + totalSize
					/ 1000 + "k");
			mProgress.setProgress(progress[0]);
			mProgress_txt.setText(progress[1] / 1000 + "k/" + totalSize / 1000
					+ "k" + "  " + progress[1] * 100 / totalSize + "%");
		}

		@Override
		protected void onPostExecute(String result) {
			try {

				if ("1".equals(result)) {
					Toast.makeText(PhotoUploadActivity.this, "上传成功!",
							Toast.LENGTH_LONG).show();
				} else {
					Toast.makeText(PhotoUploadActivity.this, "上传失败!",
							Toast.LENGTH_LONG).show();
				}

			} catch (Exception e) {

			} finally {
				try {
					dialog.dismiss();
				} catch (Exception e) {

				}
			}
		}