在Spring MVC中映射/(根URL) [英] Map / (root URL) in Spring MVC

问题描述

这是我认为应该很容易的事情，但是到目前为止，我还无法使其正常工作.

This is something that I think should be very easy, but so far I have not been able to get it to work.

我要做的是将我的根路径映射到Spring MVC Controller.对于普通的Servlet，我只需在我的web.xml中为"/"添加一个映射，它将很好地拾取它.但是使用Spring MVC并没有那么多.

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.

我尝试了很多组合，但似乎都没有用.我认为以下一种应该有效.

I have tried many combinations, but none seem to work. I think the following one should work.

在web.xml中:

<servlet-mapping>
    <servlet-name>myDispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

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">

那么显然，控制器本身就是这种情况.我不知道如何将方法映射到实际的根路径.我的尝试是这样的:

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:

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);
    }
}

因此，假设我的应用程序在http://localhost:8080/app/上运行，我希望该确切的URL执行方法display.我不想在/app/之后输入任何内容.实际上，/app/之后的某些内容已映射到其他控制器，并且一切正常(必须继续工作).

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).

我在这里想念什么?为什么这不简单地起作用?如果我使用相同的url-pattern映射到普通的Servlet实例，则可以正常工作，并且可以使用doGet方法，但是使用Spring MVC时，我似乎缺少一些特殊的黑魔法来使其正常工作.

What am I missing here? Why is this not simply working? If I use the same url-pattern to map to a plain Servlet instance, it works fine and I reach the doGet method, but with Spring MVC I seem to missing some particular black magic to get this to work.

推荐答案

您可以在web.xml文件中声明欢迎页面，而不是映射到/:

Instead of mapping to / you can declare a welcome page in your web.xml file:

<welcome-file-list>
    <welcome-file>welcome.htm</welcome-file>
</welcome-file-list>

，因此您的/路径将被处理为/welcome.htm，然后，如果您的控制器已正确映射到/welcome.htm，它将处理/，就好像它是/welcome.htm请求一样，而无需更改其他配置.

so your / path will be processed as /welcome.htm and then if your controller is correctly mapped to /welcome.htm it will process / as if it was a /welcome.htm request, without making changes to other configuration.

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