什么是 getServletContextLocal() 和 getServletContextProvider()
在我阅读的教程中，我遇到了 getServletContext() 但这两个是做什么用的？
这就是该行的外观：
ServletContext sc = getServletContextProvider().getServletContextLocal();
这与以下有何不同：
ServletContext sc = getServletContext();
In the tutorials I read I came across getServletContext() but what are these 2 for ?
This is how the line looks:
ServletContext sc = getServletContextProvider().getServletContextLocal();
How is this different from:
ServletContext sc = getServletContext();
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您的答案特定于可能实现 ServletContextProvider 接口的类。为了正确回答这个问题，您需要提供声明
ServletContextProvider的包，或者更有用的是，提供包含getServletContextProvider()和的类或接口>getServletContext()方法（声明的或抽象的）。对我们来说更容易的是，提供您引用的教程的链接或一些其他上下文（没有双关语）。互联网上对
getServletContextLocal方法的唯一引用（Google 搜索后）要么是这个问题，要么是这个问题的副本。假设 getServletContextProvider() 返回一个 ServletContextProvider 类或接口，有多个具有该名称的接口和类；我将详细介绍我找到的每一个：
getServletContextLocal()方法。getServletContextLocal()方法；该接口的实现者，LiferayServletContextProvider没有getServletContextLocal()方法，并且扩展了Object。getServletContextLocal()方法，也没有它实现了ResourceProvider接口，并扩展了 Object。getServletContextLocal()方法，该链接上列出的 4 个实现类也没有。getServletContextLocal()方法，并且扩展了 Object。getServletContextLocal()方法。结论：您输入的内容可能是您阅读的教程中的拼写错误，可能引用了最常见的可用接口，
org.apache.portals.bridges.common.ServletContextProvider，它有一个getServletContext(GenericPortlet portlet)方法。本教程可能打算编写的是 getServletContextProvider().getServletContext(local) ，其中 local 变量是扩展 javax.portlet.GenericPortlet 的类。然后，getServletContext(local)方法将返回与所述变量关联的javax.servlet.ServletContext。它是否与getServletContext()返回的javax.servlet.ServletContext相同取决于GenericPortlet变量的分配位置。帮自己一个忙，引用您所参考的教程的位置。
Your answer is specific to the class likely implementing a
ServletContextProviderinterface. In order to answer this properly, you need to provide the package whereServletContextProvideris declared, or even more helpful, the class or interface which contains thegetServletContextProvider()andgetServletContext()methods (declared or abstract).Even easier for us, provide a link to the tutorial you reference, or some additional context (no pun intended). The only references to a
getServletContextLocalmethod on the internet (after a Google search) are either this question, or copies of this question.Assuming
getServletContextProvider()returns aServletContextProviderclass or interface, there are several interfaces and classes available with that name; I'll go through each one I found:getServletContextLocal()method.getServletContextLocal()method; Implementer of said interface,LiferayServletContextProviderdoesn't have thegetServletContextLocal()method, and extends Object.getServletContextLocal()method, nor does theResourceProviderinterface it implements, and it extends Object.getServletContextLocal()method, nor do the 4 implementing classes listed on that link.getServletContextLocal()method, and extends Object.getServletContextLocal()method.Conclusion: What you've typed is likely a typo in the tutorial you read, probably referencing the most common interface available,
org.apache.portals.bridges.common.ServletContextProvider, which has agetServletContext(GenericPortlet portlet)method. What the tutorial likely intended to write isgetServletContextProvider().getServletContext(local)where thelocalvariable is a class extendingjavax.portlet.GenericPortlet. ThegetServletContext(local)method would then return thejavax.servlet.ServletContextwhich was associated with said variable. Whether it is the samejavax.servlet.ServletContextas returned bygetServletContext()depends on where theGenericPortletvariable was assigned.Do yourself a favor and cite the location of the tutorial to which you're referring.