HttpURLConnection：是否有必要调用connect（）？ [英] HttpURLConnection: Is it necessary to call connect()?

问题描述

我看到的许多示例没有显式调用 connect（）。相反，他们只是使用 getInputStream（）或 getResponseCode（）。

Many examples I've seen don't explicitly call connect(). Instead they just use getInputStream() or getResponseCode().

我假设所有这些HttpURLConnection方法需要一个连接只需调用 connect（）自己？

I'm assuming all of these HttpURLConnection methods that require a connection just call connect() themselves?

Are there any cases where connect() must be explicitly called for an HttpURLConnection?

推荐答案

不，没有情况。它隐含地按需执行。它甚至在文档中指定。以下是 URLConnection＃connect（） javadoc：

No, there are no cases. It's implicitly executed on demand. It's even specified in the documentation. Here's an extract of the URLConnection#connect() javadoc:

连接，像 getContentLength ，如果需要，将隐式执行连接。

Operations that depend on being connected, like getContentLength, will implicitly perform the connection, if necessary.

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