java - 为什么找不到处理程序方法？

Question

我想使用 org.springframework.web.bind.annotation.RestController 除了 GWT WebApplication 之外公开一个简单的 REST API。因此，我在 web.xml 中添加了另一个 servlet，并将其映射到 /app/restapi/*:

<!-- ... -->
<servlet>
    <servlet-name>xsrf</servlet-name>
    <servlet-class>com.google.gwt.user.server.rpc.XsrfTokenServiceServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>xsrf</servlet-name>
    <url-pattern>/app/xsrf</url-pattern>
</servlet-mapping>

<!-- New servlet for my REST API -->
<servlet>
    <servlet-name>mobile-dispatcher</servlet-name>
    <servlet-class>
        org.springframework.web.servlet.DispatcherServlet
    </servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>mobile-dispatcher</servlet-name>
    <url-pattern>/app/restapi/*</url-pattern>
</servlet-mapping>

这是应该处理请求的 Controller :

@RestController
@RequestMapping("/app/restapi")
public class RestaurantController {

    class ReturnValue {
        public String str = "1337";
    }

    @ResponseStatus(HttpStatus.OK)
    @RequestMapping(value = "/test", method = RequestMethod.GET, produces = { "application/json" })
    public ReturnValue getTest() {
        return new ReturnValue();
    }
}

问题是请求 http://localhost:8080/app/restapi/test 给我的只是:

16:14:22.497 [http-bio-8080-exec-8] DEBUG o.s.web.servlet.DispatcherServlet - DispatcherServlet with name 'mobile-dispatcher' processing GET request for [/app/restapi/test]
16:14:22.497 [http-bio-8080-exec-8] DEBUG o.s.w.s.m.m.a.RequestMappingHandlerMapping - Looking up handler method for path /test
16:14:22.497 [http-bio-8080-exec-8] DEBUG o.s.w.s.m.m.a.RequestMappingHandlerMapping - Did not find handler method for [/test]
16:14:22.497 [http-bio-8080-exec-8] WARN  o.s.web.servlet.PageNotFound - No mapping found for HTTP request with URI [/app/restapi/test] in DispatcherServlet with name 'mobile-dispatcher'
16:14:22.497 [http-bio-8080-exec-8] DEBUG o.s.web.servlet.DispatcherServlet - Successfully completed request

我不知道为什么。那么:我在这里做错了什么以及如何才能使这项工作按预期进行？

Answer 1

您像这样配置了 servlet 映射

<servlet-mapping>
<servlet-name>mobile-dispatcher</servlet-name>
<url-pattern>/app/restapi/*</url-pattern>
</servlet-mapping>

这是您的应用程序的根 URL。当您使用 RequestMapping("/app/restapi") 配置 RestController 时，这意味着 Controller 将监听 http://domain/app/restapi/app/restapi 。只需删除 ("/app/restapi")从你的 Controller 定义来看，你应该没问题。

启动时，Spring MVC 框架应该打印它监听到控制台的 URL 映射，您应该在那里看到 Controller 的映射。