BufferedReader的readLine函数异常

[lvhua_2004]

下面这段代码从服务器获取数据，然后通过BufferedReader的readLine函数一行一行的放到StringBuilder里，但在执行的时候，跑到reader.readLine()时，有时会出现异常； 有时候又是正常的。不管是否产生异常， conn.getResponseCode返回都是正确的值(200), 恳请哪位大神帮忙解答一下 谢谢。

public class HttpUtils {
	public static void getHttpRequest(final String address, final HttpResponseListener listener) {
		new Thread(new Runnable(){

			@Override
			public void run() {
				// TODO Auto-generated method stub
				String line = null;
				InputStream inputStream = null;
				BufferedReader reader = null;
				StringBuilder builder = new StringBuilder();
				URL url = null;
				HttpURLConnection conn = null;

				try {
					// open a HttpURLConnection object
					url = new URL(address);
					conn = (HttpURLConnection)url.openConnection();
					conn.setConnectTimeout(8000);
					conn.setReadTimeout(8000);
					conn.setRequestMethod("GET");
					
					// build the returned stream to string
					inputStream = conn.getInputStream();
					reader = new BufferedReader(new InputStreamReader(inputStream));
					while ((line = reader.readLine()) != null) {
						builder.append(line);
					}
					
					// callback builded string
					if (listener != null) {
						LogUtils.D("Server response: " + builder.toString());
						listener.onFinish(builder.toString());
					}
				} catch (Exception e) {
					if (listener != null) {
						listener.onError(e);
					}
				} finally {
					if (conn != null) {
						conn.disconnect();
					}
				}
			}
			
		}).start();
	}
}

[minigeek]

line = reader.readLine()) != null改成line = reader.readLine()) != -1