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

问题描述

我见过的许多示例都没有显式调用 connect().相反，他们只使用 getInputStream() 或 getResponseCode().

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

我假设所有这些需要连接的 HttpURLConnection 方法只是自己调用 connect() 吗?

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

是否存在必须为 HttpURLConnection 显式调用 connect() 的情况?

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

推荐答案

不，没有案例.它是按需隐式执行的.它甚至在文档中指定.这是 的摘录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:

依赖于连接的操作，如 getContentLength，将在必要时隐式执行连接.

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

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