Http Post上传图片

String filepath = "/storage/sdcard0/ShareSDK/cn.sharesdk.demo/cache/pic_glance_back.jpg";
	
	/**
	 * 上传图片
	 * 
	 * @param urlStr 上传服务器地址
	 * @param textMap
	 * @param fileMap
	 * @return
	 */
	public String formUpload(String urlStr, Map<String, String> textMap,
			Map<String, String> fileMap) {
		String res = "";
		HttpURLConnection conn = null;
		String BOUNDARY = "---------------------------123821742118716"; //boundary就是request头和上传文件内容的分隔符
		try {
			URL url = new URL(urlStr);
			conn = (HttpURLConnection) url.openConnection();
			conn.setConnectTimeout(5000);
			conn.setReadTimeout(30000);
			conn.setDoOutput(true);
			conn.setDoInput(true);
			conn.setUseCaches(false);
			conn.setRequestMethod("POST");
			conn.setRequestProperty("Connection", "Keep-Alive");
			conn
					.setRequestProperty("User-Agent",
							"Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.6)");
			conn.setRequestProperty("Content-Type",
					"multipart/form-data; boundary=" + BOUNDARY);

			OutputStream out = new DataOutputStream(conn.getOutputStream());
			// text
			if (textMap != null) {
				StringBuffer strBuf = new StringBuffer();
				Iterator iter = textMap.entrySet().iterator();
				while (iter.hasNext()) {
					Map.Entry entry = (Map.Entry) iter.next();
					String inputName = (String) entry.getKey();
					String inputValue = (String) entry.getValue();
					if (inputValue == null) {
						continue;
					}
					strBuf.append("\r\n").append("--").append(BOUNDARY).append(
							"\r\n");
					strBuf.append("Content-Disposition: form-data; name=\""
							+ inputName + "\"\r\n\r\n");
					strBuf.append(inputValue);
				}
				out.write(strBuf.toString().getBytes());
			}

			// file
			if (fileMap != null) {
				Iterator iter = fileMap.entrySet().iterator();
				while (iter.hasNext()) {
					Map.Entry entry = (Map.Entry) iter.next();
					String inputName = (String) entry.getKey();
					String inputValue = (String) entry.getValue();
					if (inputValue == null) {
						continue;
					}
					File file = new File(inputValue);
					String filename = file.getName();
//					String contentType = new MimetypesFileTypeMap()
//							.getContentType(file);
					String contentType = getContentType(inputValue);
					if (filename.endsWith(".png")) {
						contentType = "image/png";
					}
					if (contentType == null || contentType.equals("")) {
						contentType = "application/octet-stream";
					}

					StringBuffer strBuf = new StringBuffer();
					strBuf.append("\r\n").append("--").append(BOUNDARY).append(
							"\r\n");
					strBuf.append("Content-Disposition: form-data; name=\""
							+ inputName + "\"; filename=\"" + filename
							+ "\"\r\n");
					strBuf.append("Content-Type:" + contentType + "\r\n\r\n");

					out.write(strBuf.toString().getBytes());

					DataInputStream in = new DataInputStream(
							new FileInputStream(file));
					int bytes = 0;
					byte[] bufferOut = new byte[1024];
					while ((bytes = in.read(bufferOut)) != -1) {
						out.write(bufferOut, 0, bytes);
					}
					in.close();
				}
			}

			byte[] endData = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();
			out.write(endData);
			out.flush();
			out.close();

			// 读取返回数据
			StringBuffer strBuf = new StringBuffer();
			BufferedReader reader = new BufferedReader(new InputStreamReader(
					conn.getInputStream()));
			String line = null;
			while ((line = reader.readLine()) != null) {
				strBuf.append(line).append("\n");
			}
			res = strBuf.toString();
			reader.close();
			reader = null;
		} catch (Exception e) {
			System.out.println("发送POST请求出错。" + urlStr);
			e.printStackTrace();
		} finally {
			if (conn != null) {
				conn.disconnect();
				conn = null;
			}
		}
		return res;
	}
	
	/**
	 * 获取文件类型
	 * @param path
	 * @return
	 */
	private String getContentType(String path)
	{
		File file = new File(path);  
		String type = null;
		try {
			type = file.toURL().openConnection().getContentType();
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return type;
	}

 使用：

Map<String, String> textMap = new HashMap<String, String>();
				textMap.put("name", "testname");
				Map<String, String> fileMap = new HashMap<String, String>();
				fileMap.put("userfile", filepath);
				String ret = formUpload(ContactCons.URL_GET_UPLOAD_PHOTO_URL, textMap, fileMap);
				Log.d("", ret);