http request using GZIP, but was unsuccessful , Jiqiu you ~ ~ ! !

Without GZIP, no problem at all , using GZIP on the problem , described as follows:
Click the button to send data to the server , then the server receives the data returned
Click the button every time the server receives data failed , a successful one failed , very depressed ! Engage in a day, and ask for help ah ~ ~

Android side code :

	public static String send(String url, String content, String contentType) throws Exception {
  		//建立连接
  		HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
  		conn.setDoInput(true);
  		conn.setDoOutput(true);
  		conn.setUseCaches(false);
  		if (contentType != null) {
  			conn.setRequestProperty("content-type", contentType);
  		} else {
  			conn.setRequestProperty("content-type", CONTENT_TYPE_HTML);
  		}
  		conn.setConnectTimeout(10000);
  		conn.setReadTimeout(60000);
  		conn.setRequestMethod("POST");
  		conn.connect();
  		
  		//发送数据
  		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new GZIPOutputStream(conn.getOutputStream()), "GBK"));
  		bw.write(content);
  		bw.flush();
  		bw.close();
  		
  		
  		//接收返回数据
  		StringBuffer sb = new StringBuffer();
  		BufferedReader br = new BufferedReader(new InputStreamReader(new GZIPInputStream(conn.getInputStream()), "GBK"));
  		String str = null;
  		while ((str = br.readLine()) != null) {
  			sb.append(str);
  		}
  		br.close();
  		
  		conn.disconnect();
  		return sb.toString();
  	}

server code :

	/**
  	 * 接收HTTP数据
  	 * @param request
  	 * @param response
  	 * @return 数据
  	 */
  	public static String receive(HttpServletRequest request) {
  		StringBuffer sb = new StringBuffer();
  		BufferedReader br = null;
  		try {
  			br = new BufferedReader(new InputStreamReader(new GZIPInputStream(request.getInputStream()), "GBK"));
  			String str = null;
  			while ((str = br.readLine()) != null) {
  				sb.append(str);
  			}
  			br.close();
  			
  		} catch (Exception e) {
  			e.printStackTrace();
  		} finally {
  			try {
  				if (br!=null) br.close();
  			} catch (IOException e) {
  				e.printStackTrace();
  			}
  		}
  		return sb.toString();
  	}
  	
  	/**
  	 * 响应HTTP数据
  	 * @param responseText
  	 * @param response
  	 */
  	public static void response(String responseText, HttpServletResponse response) {
  		BufferedWriter bw = null;
  		try {
  			response.setHeader("Content-Encoding", "gzip");
  			bw = new BufferedWriter(new OutputStreamWriter(new GZIPOutputStream(response.getOutputStream()), "GBK"));
  			bw.write(responseText);
  			bw.flush();
  			bw.close();
  			
  		} catch (Exception e) {
  			e.printStackTrace();
  		} finally {
  			try {
  				if (bw!=null) bw.close();
  			} catch (IOException e) {
  				e.printStackTrace();
  			}
  		}
  	}

I wrote these two tools, you can try good intentions , Android build button on the line , client services Servlet build on the line .

so dotted , thank you ! ! !
------ Solution ---------------------------------------- ----
seemingly GZIP the JDK itself is a problem , you look at this article useful to you : http://cin-ie.iteye.com/blog/859822
- ----- For reference only ---------------------------------------
By the way , the exception is : java.io.IOException: Unknown format
on the Android side :

BufferedReader br = new BufferedReader(new InputStreamReader(new GZIPInputStream(conn.getInputStream()), "GBK"));

thrown out
------ For reference only ------------------------------- --------
back to the 2nd floor , try it today and see as not
------ For reference only --------------- ------------------------
really is such a thing , put like that
------ For reference only ---------------------------------------
put is not so , hey