Going to buffer response body of large or unknown size. Using getResponseBodyAsS

[WARN ] 2011-04-19 21:38:01 Method: org.apache.commons.httpclient.HttpMethodBase.getResponseBody(HttpMethodBase.java:682)
Going to buffer response body of large or unknown size. Using getResponseBodyAsStream instead is recommended.
[WARN ] 2011-04-19 21:38:22 Method: org.apache.commons.httpclient.HttpMethodBase.getResponseBody(HttpMethodBase.java:682)
Going to buffer response body of large or unknown size. Using getResponseBodyAsStream instead is recommended.

使用HttpClient，总是报出“Going to buffer response body of large or unknown size. Using getResponseBodyAsStream instead is recommended.”的WARN日志，定位到HttpClient的源码如下：

public byte[] getResponseBody() throws IOException {
if (this.responseBody == null) {
InputStream instream = getResponseBodyAsStream();
if (instream != null) {
long contentLength = getResponseContentLength();
if (contentLength > Integer.MAX_VALUE) { //guard below cast from overflow
throw new IOException("Content too large to be buffered: "+ contentLength +" bytes");
}
int limit = getParams().getIntParameter(HttpMethodParams.BUFFER_WARN_TRIGGER_LIMIT, 1024*1024);
if ((contentLength == -1) || (contentLength > limit)) {
LOG.warn("Going to buffer response body of large or unknown size. "
+"Using getResponseBodyAsStream instead is recommended.");
}
LOG.debug("Buffering response body");
ByteArrayOutputStream outstream = new ByteArrayOutputStream(
contentLength > 0 ? (int) contentLength : DEFAULT_INITIAL_BUFFER_SIZE);
byte[] buffer = new byte[4096];
int len;
while ((len = instream.read(buffer)) > 0) {
outstream.write(buffer, 0, len);
}
outstream.close();
setResponseStream(null);
this.responseBody = outstream.toByteArray();
}
}
return this.responseBody;
}

报WARN的条件是 ((contentLength == -1) || (contentLength > limit))，也就是说，或者是返回的HTTP头没有指定contentLength，或者是contentLength大于上限（默认是1M）。如果能确定返回结果的大小对程序没有显著影响，这个WARN就可以忽略，可以在日志的配置中把HttpClient的日志级别调到ERROR，不让它报出来。

当然，这个警告也是有意义的，HttpClient建议使用InputStream getResponseBodyAsStream()代替byte[] getResponseBody()。对于返回结果很大或无法预知的情况，就需要使用InputStream getResponseBodyAsStream()，避免byte[] getResponseBody()可能带来的内存的耗尽问题。

使用String response = method.getResponseBodyAsString().trim();获得getMethod返回的内容，

每次都出现如下警告：

[WARN org.apache.commons.httpclient.HttpMethodBase] Going to buffer response body of

large or unknown size. Using getResponseBodyAsStream instead is recommended.

解决方法：

//String response = method.getResponseBodyAsString().trim();
InputStream resStream = method.getResponseBodyAsStream();
BufferedReader br = new BufferedReader(new InputStreamReader(resStream));
StringBuffer resBuffer = new StringBuffer();
String resTemp = "";
while((resTemp = br.readLine()) != null){
resBuffer.append(resTemp);
}
String response = resBuffer.toString();

//String response = method.getResponseBodyAsString().trim(); InputStream resStream = method.getResponseBodyAsStream(); BufferedReader br = new BufferedReader(new InputStreamReader(resStream)); StringBuffer resBuffer = new StringBuffer(); String resTemp = ""; while((resTemp = br.readLine()) != null){ resBuffer.append(resTemp); } String response = resBuffer.toString();

http://stackoverflow.com/questions/745022/whats-the-best-way-to-suppress-a-runtime-console-warning-in-java