java Spring MVC 中的映射 /（根 URL）
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Map / (root URL) in Spring MVC
提问by pbean
This is something that I think should be very easy, but so far I have not been able to get it to work.
这是我认为应该很容易的事情，但到目前为止我还没有能够让它发挥作用。
What I want to do is map my root path to a Spring MVC Controller. With a normal Servlet, I would just add a mapping for "/" in my web.xml, and it would pick it up quite well. But with Spring MVC, not so much.
我想要做的是将我的根路径映射到 Spring MVC 控制器。使用普通Servlet，我只需/在我的 中添加“ ”的映射web.xml，它就会很好地提取它。但是对于 Spring MVC，不是那么多。
I have tried many combinations, but none seem to work. I think the following one should work.
我尝试了很多组合，但似乎都不起作用。我认为以下应该有效。
In web.xml:
在web.xml：
<servlet-mapping>
<servlet-name>myDispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
In my contextConfigLocationfile:
在我的contextConfigLocation文件中：
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="alwaysUseFullPath" value="true"/>
<property name="mappings">
<util:map>
<entry key="/" value-ref="rootController"/>
</util:map>
</property>
</bean>
<bean id="rootController" class="my.package.RootController">
Then obviously, there is the case of the controller itself. I have no clue how to map the method to the actual root path. My attempt is something like this:
那么显然，控制器本身就有这种情况。我不知道如何将该方法映射到实际的根路径。我的尝试是这样的：
public class RootController extends MultiActionController {
@RequestMapping("/")
public ModelAndView display(HttpServletRequest request, HttpServletResponse response) throws Exception {
final Map<String, Object> model = new HashMap<String, Object>();
model.put("someVariable", "Hello, MVC world.");
return new ModelAndView("rootPage", model);
}
}
So let's say my application runs on http://localhost:8080/app/, I want that exact URL to execute the method display. I do not want to type anything after /app/. In fact, some things after /app/are mapped to other controllers, and that all works fine (and they have to keep working).
因此，假设我的应用程序在 上运行http://localhost:8080/app/，我想要该确切的 URL 来执行该方法display。我不想在 之后输入任何内容/app/。事实上，之后的一些东西/app/被映射到其他控制器，并且一切正常（并且它们必须继续工作）。
What am I missing here? Why is this not simply working? If I use the same url-patternto map to a plain Servletinstance, it works fine and I reach the doGetmethod, but with Spring MVC I seem to missing some particular black magic to get this to work.
我在这里错过了什么？为什么这不简单？如果我使用它url-pattern来映射到一个普通Servlet实例，它工作正常并且我到达了该doGet方法，但是使用 Spring MVC 我似乎缺少一些特殊的黑魔法来让它工作。
回答by Boris Treukhov
Instead of mapping to /you can declare a welcome page in your web.xmlfile:
/您可以在web.xml文件中声明一个欢迎页面，而不是映射到您：
<welcome-file-list>
<welcome-file>welcome.htm</welcome-file>
</welcome-file-list>
so your /path will be processed as /welcome.htmand then if your controller is correctly mapped to /welcome.htmit will process /as if it was a /welcome.htmrequest, without making changes to other configuration.
所以您的/路径将被处理/welcome.htm，然后如果您的控制器正确映射到/welcome.htm它，它将/像处理/welcome.htm请求一样处理，而不更改其他配置。
回答by dardo
I'd recommend getting rid of the SimpleUrlHandlerMapping and just doing the following:
我建议摆脱 SimpleUrlHandlerMapping 并执行以下操作：
@Controller
@RequestMapping("/")
public class RootController
{
@RequestMapping(method=RequestMethod.GET)
public ModelAndView display(...)
{
...
}
}
This should get the result you want. Also, add <mvc:annotation-driven/>to your servlet context with a <context:component-scan base-package="some.package.path.to.controller" />to have Spring wire up that controller.
这应该会得到你想要的结果。此外，<mvc:annotation-driven/>使用 a添加到您的 servlet 上下文<context:component-scan base-package="some.package.path.to.controller" />以使 Spring 连接该控制器。
Otherwise, you can probably map the URL with the SimpleUrlHandlerMapping as so:
否则，您可以使用 SimpleUrlHandlerMapping 映射 URL，如下所示：
<property name="mappings">
<value>
/*=rootController
</value>
<property>
If done this way, you can keep the bean defined for rootController.
如果这样做，您可以保留为 rootController 定义的 bean。
回答by westcoastmilt
For Spring Webflow, the suggestion from Boris Treukhov to use web-file-list led to my discovering a hack that worked for weblogic. For example, if welcome is a flow.xml file, do the following: Change the url-pattern from \ to *.html in web.xml. Place a dummy(empty) file welcome.htm into the folder src\main\webapp\WEB-INF. In SimpleUrlHandlerMapping map the value /welcome.htm=flowController. Finally, complete the registry, flow-location path="welcome.xml". Refer to link: http://forum.spring.io/forum/spring-projects/web/50547-welcome-file-list-with-spring.
对于 Spring Webflow，Boris Treukhov 建议使用 web-file-list 导致我发现了一个适用于 weblogic 的 hack。例如，如果welcome 是一个flow.xml 文件，请执行以下操作： 将web.xml 中的url-pattern 从\ 更改为*.html。将一个虚拟（空）文件welcome.htm 放入文件夹src\main\webapp\WEB-INF。在 SimpleUrlHandlerMapping 映射值 /welcome.htm=flowController。最后完成注册表，flow-location path="welcome.xml"。参考链接：http: //forum.spring.io/forum/spring-projects/web/50547-welcome-file-list-with-spring。
