Android OutputStreamWriter's flush method throws IOException

<span style="white-space: pre;">	Android开发弱网络客户端的时候，需要给服务器发送HTTP POST请求，首先进行设置</span>

<span style="white-space: pre;">	</span>URL url = new URL(urlString);
	connection = (HttpURLConnection) url.openConnection();
	connection.setConnectTimeout(Constants.CONNECTION_TIMEOUT);
	connection.setReadTimeout(Constants.IO_TIMEOUT);
	connection.setDoOutput(true);
	connection.setRequestMethod("POST");
	connection.setUseCaches(false);
	connection.setRequestProperty("Content-Type",
	<span style="white-space: pre;">	</span>"application/json:charset=utf-8");
	connection.setDoInput(true);
	connection.setDoOutput(true);

<span style="white-space:pre">	</span>connection.connect();

<span style="white-space:pre">	</span>osw = new OutputStreamWriter(connection.getOutputStream());

<span style="white-space:pre">	</span>BufferedReader reader = new BufferedReader(
<span style="white-space:pre">	</span>new InputStreamReader(conn.getInputStream()));
<span style="white-space:pre">	</span>//本语句是造成IOException的原因  (1)

然后写入数据

	String requestContent = "[" + "{\"ipaddress\":\"" + localIp + "\","
						+ "\"nettype\":\"" + (netType) + "\"," + "\"envtype\":\""
						+ envType  + "\"}" + "]";
	osw.write(requestContent);
	osw.flush();
	osw.close();

报了IOException的错误，此时HTTP的写内容还没完毕，就在代码(1)处开了一个BufferReader，所以造成了IOException。

                还有其它人遇到同样的问题，但是原因不一样，请参考

http://stackoverflow.com/questions/4736042/outputstreamwriters-flush-method-throws-ioexception-when-trying-to-write-chines

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