如何在 JSF 框架中实现 JAX-RS RESTful 服务

问题描述

在我的实验室中，我被要求使用 JSF 框架和 REST 创建一个简单的网站.我对这两个做了一些研究.事实证明，对于 REST，我必须将 JAX-RS 框架与 Jersey 一起使用.我想知道如何集成 JAX-RS 和 JSF 这两个框架?

In my lab I was asked to create a simple website using JSF framework and use REST as well. I did some research on those two. It turns out that for REST I have to use JAX-RS framework with Jersey. I was wondering how can I integrate these two frameworks, JAX-RS and JSF?

我已经在 web.xml 中为 JSF 提供了以下 servlet:

I've already the below servlet in web.xml for JSF:

<servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>/test/*</url-pattern>
</servlet-mapping>

对于 Jersey，我想我必须在 web.xml 中使用以下 servlet:

For Jersey I figured that I have to use the below servlet in web.xml:

<servlet>
    <servlet-name>Jersey REST Service</servlet-name>
    <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
    <init-param>
        <param-name>jersey.config.server.provider.packages</param-name>
        <param-value>com.jbm.rest</param-value>
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>Jersey REST Service</servlet-name>
    <url-pattern>/api/*</url-pattern>
</servlet-mapping>

现在我担心的是，在我看来，这个 Jersey servlet 将替换 web.xml 中的 Faces servlet.这会将我的应用程序从 JSF 更改为 JAX-RS.但我想保留 JSF 并使用 JAX-RS.我该怎么做?

Now my concern is, to me it seems like this Jersey servlet will replace the Faces servlet in web.xml. This will change my application from JSF to JAX-RS. But I want to keep JSF and use JAX-RS as well. How can I do that?

推荐答案

这种担心是不必要的.您可以在一个 Web 应用程序中安全地拥有多个 servlet，只要它们的 URL 模式不会相互冲突.通常情况下，如果是这种情况，稍微理智的 servlet 容器就会在 webapp 启动期间抛出异常.就您而言，您已经在 /test/* 上注册了 JSF servlet(顺便说一句，这很奇怪，您 通常为此使用 *.xhtml )，你已经在 /api/* 上注册了 JAX-RS servlet.因此，您只需必须使用与这些 URL 模式匹配的 URL 来调用它们.

This concern is unnecessary. You can safely have multiple servlets in a single web application, as long as their URL patterns do not clash with each other. Usually, if that were the case, a bit sane servlet container would already throw an exception during webapp's startup. In your case, you've registered the JSF servlet on /test/* (which is a strange, by the way, you usually use *.xhtml for that), and you've registered the JAX-RS servlet on /api/*. So you just have to call them using URLs matching those URL patterns.

而且，为了消除概念上的误解，您根本没有也不能在 JSF 中实现 REST".它们彼此完全独立.他们可以轻松地在同一个 Web 应用程序中轻松地彼此相邻运行，而无需相互了解.他们唯一可能共享的是服务层或共享"(CDI) 托管 bean.但通常就是这样.服务层的设计又与谁在使用它无关.

And, to clear out a conceptual misunderstanding, you don't and can't "implement REST in JSF" at all. They are completely independent from each other. They can just easily run next each other in the same web application in all peace without knowing about each other. The only thing which they might share is the service layer or 'shared' (CDI) managed beans. But that's usually it. The design of the service layer is in turn independent from who's using it.

这个特定问题与 JSF 或 JAX-RS 无关.它只是基本servlet.回到基础并花一点时间了解更多信息，这可能也是值得的./a> 关于基本上每个 Java EE Web 应用程序的基石.