httpclient请求返回响应体，报警告"Going to buffer response body of large or unknown size"的解决方案

Posted 2020-10-04 dali_lyc

 通过httpclient模拟post请求，接收响应的时候报了这样一个警告：

org.apache.commons.httpclient.HttpMethodBase - Going to buffer response body of large or unknown size. Using getResponseBodyAsStream instead is recommended.

是由于返回的HTTP头没有指定contentLength，或者是contentLength大于上限（默认是1M）；

HttpClient建议使用getResponseBodyAsStream()代替getResponseBody()，可避免getResponseBody()可能带来的内存的耗尽问题。

代码如下：

public static String postByTextString(String url, String text, String token) {
        HttpClient httpClient = new HttpClient();
        PostMethod postMethod = new PostMethod(url);
        try {
            StringRequestEntity entity = new StringRequestEntity(text, "text/plain", Constants.CHARSET_UTF8);
            postMethod.setRequestEntity(entity);
            postMethod.setRequestHeader("token", token);
            httpClient.executeMethod(postMethod);
            if (postMethod.getStatusCode() == HttpStatus.SC_OK) {
　　　　　　　　　 // 通过读流的方式替代getResponseBodyAsString()
                InputStream inputStream = postMethod.getResponseBodyAsStream();
                BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
                StringBuffer stringBuffer = new StringBuffer();
                String str;
                while((str = br.readLine()) != null){
                    stringBuffer.append(str);
                }
                String response = new String(stringBuffer);
                br.close();
　　　　　　　　　 // String response = new String(postMethod.getResponseBodyAsString());
                return response;
            } else {
                return null;
            }
        } catch (HttpException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            postMethod.releaseConnection();
        }
        return null;