Servlet引擎在调用Servlet之前是否会读取整个请求? [英] Does servlet engine read the whole request before calling a servlet?

问题描述

Servlet引擎(例如Tomcat或Jetty)接收HTTP请求，并使用HttpServletRequest对象调用servlet，该对象包含请求主体的InputStream.

Servlet engine (e.g. Tomcat or Jetty) receives an HTTP request and calls a servlet with an HttpServletRequest object, which contains an InputStream of the request body.

现在，我想知道引擎是否已经从网络读取了整个请求，而InputStream只是内存中的缓冲区，还是已经部分读取了 请求当servlet调用InputStream.read时，它实际上 读取套接字.

Now I wonder if the engine has already read the whole request from the network and the InputStream is just a buffer in memory or it has read the request partially and when the servlet calls the InputStream.read it actually reads the socket.

推荐答案

至少在POST情况下，它必须这样做，因此它可以从请求正文中的名称/值对形成requestParameterMap.

It has to, at least in the case of POST, so it can form the requestParameterMap from the name-value pairs in the body of the request.

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