java.net.HttpURLConnection中重新打开连接的方法

发布于 2025-01-07 20:14:28 字数 729 浏览 2 评论 0原文

首先，我打开一个连接并向服务器发送一些数据。接下来我得到回应。

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周期 - 发送数据并接收答案。问题是，如果我使用相同的 wr 对象，我会得到 IOException：流已关闭。如果我尝试创建一个新对象：

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

我得到ProtocolException: OutputStream unavailable，因为请求标头已被发送！。如果我断开连接并建立新连接并不重要 - 都是一样的。

有什么办法可以重新打开连接吗？

我在 Android 上制作了它，但我不确定它在这种情况下是否有任何区别。

原文

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()));
...

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());

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.

Is there any way to reopen the connection?

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

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眼中杀气 2025-01-14 20:14:28

您需要再次调用 url.openConnection() 并获取新连接。如果请求是针对同一主机的，HttpURLConnection 应该足够智能，能够重用现有连接。引用文档：

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.

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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