DataInputStream的问题

........
URL url = new URL(requestUrl);
uc = (HttpURLConnection) url.openConnection();
uc.setRequestMethod("POST");
uc.setDoInput(true);
uc.setDoOutput(true);
uc.setUseCaches(false);
uc.setRequestProperty("User-agent", "MSIE");
uc.connect();if (requestStr != null && requestStr.trim().length() > 0) {
uc.getOutputStream().write(requestStr.getBytes());
}
//uc.getOutputStream().close();
int responsecode = uc.getResponseCode();
int cl = uc.getContentLength();java.io.DataInputStream in = new java.io.DataInputStream(new BufferedInputStream(uc
.getInputStream()));byte buffer[] = new byte[cl];
int len = 0;while (len < cl) {
int remainedLen = cl - len;
if (remainedLen > 1024)
remainedLen = 1024;
int readLen = in.read(buffer, len, remainedLen);
if (readLen == -1 || readLen == 0) {
break;
} len = len + readLen;
//System.out.println(len);
}
log.debug("get Result-->" + responsecode + ":" + cl + ":" + len);