使用 HttpURLConnection 调用 WebService 时的性能调整
我试图调用一个返回太多数据的网络服务，只是为了提取一小部分数据。
所以，我决定不使用Java生成的标准Client。
我使用以下代码进行连接：
HttpURLConnection connection;
byte[] requestData = .....
URL url = new URL(wsUrl);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "text/xml");
connection.setRequestProperty("Content-Length", String.valueOf(requestData.length));
connection.connect();
OutputStream connOs = connection.getOutputStream();
connOs.write(requestData);
connOs.close();
InputStream is = connection.getInputStream(); // <<< THIS IS THE MOST TIME CONSUMING, it takes about 70 ms
byte[] rply = stream2Bytes(is);
is.close();
connection.disconnect();
大部分时间消耗在调用 connection.getInputStream(); 上，大约需要 70 毫秒。
我正在尝试设置许多请求标头来减少这个时间，但无法达到。
据我了解，HttpUrlConnection 使用 HTTP1.1 协议，默认使用 Connection=KEEP-ALIVE 标头，以便重用底层 TCP 连接。
I am trying to call a webservice that return too much data just to extract a small piece of data.
So, I decided not to use the standard Client which is generated by Java.
I use the following code to do the connection:
HttpURLConnection connection;
byte[] requestData = .....
URL url = new URL(wsUrl);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "text/xml");
connection.setRequestProperty("Content-Length", String.valueOf(requestData.length));
connection.connect();
OutputStream connOs = connection.getOutputStream();
connOs.write(requestData);
connOs.close();
InputStream is = connection.getInputStream(); // <<< THIS IS THE MOST TIME CONSUMING, it takes about 70 ms
byte[] rply = stream2Bytes(is);
is.close();
connection.disconnect();
The most time is consumed in the call to connection.getInputStream(); which it takes about 70ms.
I am trying setting many request headers to reduce this time but cannot reach.
My understanding it that the HttpUrlConnection uses HTTP1.1 protocol that uses Connection=KEEP-ALIVE header by default so that the underlying TCP connection is reused.
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connection.getInputStream();- 等待服务器响应的函数...您无法加快此过程。connection.getInputStream();- function which wait for server response... you can't speed up this proccess.