方法链接如何工作? [英] How does method chaining work?

问题描述

在下面的示例中，如何从getServletContext()调用getRequestDispatcher("xxx")?这样的调用过程通常如何工作?请给我有关此情况的清晰图片.

How does getRequestDispatcher("xxx") get called from getServletContext() in the example below? How does calling procedures like this work in general? Please give me a clear picture about this context.

RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/index.jsp");
dispatcher.include(request, response);

推荐答案

getServletContext()返回ServletContext对象，该对象具有称为getRequestDispatcher()的方法.您的代码行只是两个方法调用的简写，等效于以下代码:

getServletContext() returns a ServletContext object, which has a method called getRequestDispatcher(). Your line of code is just shorthand for two method calls, and is equivalent to this code:

ServletContext context = getServletContext();
RequestDispatcher dispatcher = context.getRequestDispatcher("/index.jsp");

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