在重新开放连接java.net.HttpURLConnection中的方法 [英] Way of reopening connection in java.net.HttpURLConnection

问题描述

首先，我打开连接并一些数据发送到服务器。接下来，我得到回应。

First, I open a connection and send some data to server. Next I get a response.

HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();

wr = new OutputStreamWriter(connection.getOutputStream());
wr.write("some text sent to server");
wr.flush();

//read the server answer
rd  = new BufferedReader(new InputStreamReader(connection.getInputStream()));
...

我需要的是再次重复整个循环 - 发送数据和接收答案。现在的问题是，如果我使用相同的 WR 的对象，我得到的 IOException异常：流闭的。如果我尝试做一个新的对象：

What I need is to repeat the whole cycle again - send data and receive answer. The problem is that if I use the same wr object I get the IOException: stream closed. And if I try to make a new object:

wr = new OutputStreamWriter(connection.getOutputStream());

我得到的的ProtocolException：因为请求头已经发送的OutputStream不可用的！如果我断开并建立新的连接不要紧 - 这都是一样的。

I get ProtocolException: OutputStream unavailable because request headers have already been sent!. It doesn't matter if I disconnect and make a new connection - it is all the same.

有什么办法重新连接？

和我让它在Android，但我真的不知道，如果它使在这种情况下任何区别。

And I make it on Android, but I'm not really sure if it makes any difference in this situation.

推荐答案

您需要再次调用 url.openConnection（），并得到一个新的连接。如果请求是在同一主机 HttpURLConnection类应该足够聪明重用现有的连接。从文档报价：

You need to call url.openConnection() again and get a new connection. HttpURLConnection should be smart enough to reuse the existing connection if the request is to the same host. Quote from the docs:

Each HttpURLConnection instance is used to make a single request but the underlying network connection to the HTTP server may be transparently shared by other instances.

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