Android OutputStreamWriter's flush method throws IOException

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<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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