Question

我正在尝试了解HttpURLConnection的行为，到目前为止，我必须了解所有关于连接超时，读取超时等的事情。

现在假设我已经成功打开了url连接，还有outputStream来写数据。

现在我正在尝试在服务器上写入数据，out.write（requestByte）; 所以，如果我在 out.write（requestByte）行获得IOException，那么它表示什么？

请求是否已到达服务器？

        try {
                out.write(requestByte);
                logger.info("API Request sent at : " + sdf.format(new Date()));
                out.close();
            } catch (IOException e) {
                logger.info("Exception while writing request to output stream");
                e.printStackTrace();
            }

这是完整的代码......

try {
            bridgeUrl = new URL(url);

            if (connectionTime == null) {
                connectionTime = StartupCache.getInstance().getConfigByKey(getUniqueKey(ConfigurationConstant.CONNECTION_TIME_OUT));
                //connectionTime = TransactionPersistence.getInstance().getConfigByConfigKey(ConfigurationConstant.CONNECTION_TIME_OUT);
                if (connectionTime != null && connectionTime.getConfigValue().trim().length() > 0) {
                    connectionTimeOutInMilliSec = Integer.valueOf(connectionTime.getConfigValue());
                }
            }

            if (bridgeUrl.getProtocol().equalsIgnoreCase("https")) {
                ignoreSslCertificateAuthentication();
                httpConn = (HttpsURLConnection) bridgeUrl.openConnection();
            } else {
                httpConn = (HttpURLConnection) bridgeUrl.openConnection();
            }
            logger.info("\ Request : "+request+"\n");

            request="JsonData="+request;
            byte[] requestByte = request.getBytes();
            httpConn.setRequestProperty("Content-Length", String.valueOf(requestByte.length));
            httpConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded" );
            httpConn.setRequestMethod("POST");
            httpConn.setDoOutput(true);
            httpConn.setDoInput(true);
            httpConn.setConnectTimeout(connectionTimeOutInMilliSec);
            httpConn.setReadTimeout(connectionTimeOutInMilliSec);
            out = httpConn.getOutputStream();
            try {
                out.write(requestByte);
                logger.info("API Request sent at : " + sdf.format(new Date()));
                out.close();
            } catch (IOException e) {
                logger.info("Exception while writing request to output stream");
                e.printStackTrace();
            }
        }catch(MalformedURLException exMurl){
            logger.info(exMurl.getMessage());
            throw new ApiRequestPostingException("Exception occured while posting request to server");
        }
        catch(SocketTimeoutException stout){
            logger.error(stout.getMessage());
            stout.printStackTrace();

            if (httpConn != null) {
                logger.info("Closing httpConn in exception blcok of output stream connection....");
                httpConn.disconnect();
            }

            throw new ApiRequestPostingException("Exception occured while posting request to server");
        }catch(IOException ioex){
            logger.error(ioex.getMessage());
            ioex.printStackTrace();

            if (httpConn != null) {
                logger.info("Closing httpConn in exception blcok of output stream connection....");
                httpConn.disconnect();
            }

            throw new ApiRequestPostingException("Exception occured while posting request to server");
        }

Answer 1

如果我在行out.write（requestByte）获得IOException，那么它表示什么？

请求是否已到达服务器？

不。它取决于你捕获的IOException，但大多数都表明连接被致命地破坏了。如果数据已发送，或者至少缓冲到本地套接字发送缓冲区，则您将无法获得IOException。

请注意，你必须做一些输入。您至少必须致电getResponseCode()，然后记录结果。

请求到达服务器？在outputstream上写请求时发生IOException

1 个答案: