android实现的文件上传案例探讨

以为要做android项目的文件上传，在优快云看到了鸿洋_大神的《从原理角度解析Android （Java） http 文件上传》http://blog.youkuaiyun.com/lmj623565791/article/details/23781773

从原理角度解析Android （Java） http 文件上传

已经讲的很详细，但是唯一不足的是，提供的源码是Java版本的，然后我又实现了一个android版本的文件上传

下面是主要代码：

/**
	 * Create a thread to upload the file.
	 * @param filepath
	 * @param uploadUrl
	 */
	public void startUploadFile(final String filepath, final String uploadUrl) {
		
		final Message msg = Message.obtain(); // Get the Message object
		// Create a new thread to do the upload
		Thread thread = new Thread(new Runnable() {
			
			@Override
			public void run() {
				// TODO Auto-generated method stub
				boolean flag = uploadFile(filepath, uploadUrl); // Call the upload file function
				if(flag) {
					msg.what = 1; // Upload file succeeded.
				} else {
					msg.what = 0; // Upload file failed.
				}
				handler.sendMessage(msg);
			}
		});
		
		thread.start(); // Start the thread
			
	}
	
	/**
	 * Upload the specified file to remote server.
	 * @param filepath The path of the local file.
	 * @param uploadUrl The server url.
	 * @return The upload status.
	 */
	public boolean uploadFile(String filepath, String uploadUrl) {
		boolean status = true;
		
		String end = "\r\n";
		String twoHyphens = "--";
		String boundary = "******";
		try
		{
			URL url = new URL(uploadUrl);
			HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();

			// Set the size of the transfer stream, in case that the application
			// collapses due to small memory, this method is used when we don't
			// know the size of the content, we use HTTP request without cache
			httpURLConnection.setChunkedStreamingMode(128 * 1024);// 128K  
			
			// Set the input and output
			httpURLConnection.setDoInput(true);
			httpURLConnection.setDoOutput(true);
			httpURLConnection.setUseCaches(false);
			
			// Set the HTTP method
			httpURLConnection.setRequestMethod("POST");
			httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
			httpURLConnection.setRequestProperty("Charset", "UTF-8");
			httpURLConnection.setRequestProperty("Content-Type",
					"multipart/form-data;boundary=" + boundary);

			// Get outputstream according to the url connection
			DataOutputStream dos = new DataOutputStream(httpURLConnection.getOutputStream());
			
			// Write the HTTP POST header
			dos.writeBytes(twoHyphens + boundary + end);
			dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\"; filename=\""
					+ filepath.substring(filepath.lastIndexOf("/") + 1)
                + "\"" + end);
            dos.writeBytes(end);
        
            FileInputStream fis = new FileInputStream(filepath);
            
            int bufferSize = 8 * 1024; // The size of the buffer, 8KB.
            byte[] buffer = new byte[bufferSize];
            int length = 0;

            while ((length = fis.read(buffer)) != -1) {
            	
            	// Write data to DataOutputStream
            	dos.write(buffer, 0, length);
            }
            
            dos.writeBytes(end);
            dos.writeBytes(twoHyphens + boundary + twoHyphens + end);
            
            fis.close(); // Close the FileInputStream.
            dos.flush(); // Flush the data to DataOutputStream.
        
            // Get the content of the response
            InputStream is = httpURLConnection.getInputStream();
            
            InputStreamReader isr = new InputStreamReader(is, "utf-8");  
            BufferedReader br = new BufferedReader(isr, 8 * 1024);  
            String result = br.readLine();
        
            Log.d(Tag, result);
            
//            dos.close(); // Will respond I/O exception if closes.
          } catch (Exception e) {
        	  e.printStackTrace();
        	  status = true;
          }
		return status;
	}

private static final String BOUNDARY = "----WebKitFormBoundaryT1HoybnYeFOGFlBR";

	/**
	 * 
	 * @param params
	 *            传递的普通参数
	 * @param uploadFile
	 *            需要上传的文件名
	 * @param fileFormName
	 *            需要上传文件表单中的名字
	 * @param newFileName
	 *            上传的文件名称，不填写将为uploadFile的名称
	 * @param urlStr
	 *            上传的服务器的路径
	 * @throws IOException
	 */
	public void uploadForm(Map<String, String> params, String fileFormName,
			File uploadFile, String newFileName, String urlStr)
			throws IOException {
		if (newFileName == null || newFileName.trim().equals("")) {
			newFileName = uploadFile.getName();
		}

		StringBuilder sb = new StringBuilder();
		/**
		 * 普通的表单数据
		 */
		for (String key : params.keySet()) {
			sb.append("--" + BOUNDARY + "\r\n");
			sb.append("Content-Disposition: form-data; name=\"" + key + "\""
					+ "\r\n");
			sb.append("\r\n");
			sb.append(params.get(key) + "\r\n");
		}
		/**
		 * 上传文件的头
		 */
		sb.append("--" + BOUNDARY + "\r\n");
		sb.append("Content-Disposition: form-data; name=\"" + fileFormName
				+ "\"; filename=\"" + newFileName + "\"" + "\r\n");
		sb.append("Content-Type: image/jpeg" + "\r\n");// 如果服务器端有文件类型的校验，必须明确指定ContentType
		sb.append("\r\n");

		byte[] headerInfo = sb.toString().getBytes("UTF-8");
		byte[] endInfo = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("UTF-8");
		System.out.println(sb.toString());
		URL url = new URL(urlStr);
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		conn.setRequestMethod("POST");
		conn.setRequestProperty("Content-Type",
				"multipart/form-data; boundary=" + BOUNDARY);
		conn.setRequestProperty("Content-Length", String
				.valueOf(headerInfo.length + uploadFile.length()
						+ endInfo.length));
		conn.setDoOutput(true);

		OutputStream out = conn.getOutputStream();
		InputStream in = new FileInputStream(uploadFile);
		out.write(headerInfo);

		byte[] buf = new byte[1024];
		int len;
		while ((len = in.read(buf)) != -1)
			out.write(buf, 0, len);

		out.write(endInfo);
		in.close();
		out.close();
		if (conn.getResponseCode() == 200) {
			System.out.println("上传成功");
		}

	}