Question

我想创建一个抽象控制器，它将为扩展控制器的实际映射添加额外的请求映射。

例如，对于以下控制器

@Controller
public class MyController extends VariableResolvingController {
    @RequestMapping("page.htm") 
    public void handlerMethod() {
    }
}

我希望它扩展VariableResolvingController，它将使用“page.htm.context”URI为其resolveContextVariable(...)方法添加映射。

public abstract class VariableResolvingController {
    public final @ResponseBody Object resolveContextVariable(String variableName) {
        return "{}";
    }

    protected final void registerVariableResolver(String variableName, VariableResolver resolver) {
        //...
    }
}

这种方法增加了使用例如解决自定义变量的可能性。 AJAX请求对客户端代码几乎是透明的。

您知道在这种情况下适合的任何现有解决方案吗？

解决方案：我通过编写自定义HandlerMapping实现（实质上是RequestMappingHandlerMapping的装饰器）实现了我的目标。

Answer 1

一种方法是在spring mvc中添加简单的Servlet过滤器

 public class RequestCheckFilter implements Filter {

        @Override
        public void destroy() {
            // ...
        }

        @Override
        public void init(FilterConfig filterConfig) throws ServletException         {
            //
        }

        @Override
        public void doFilter(ServletRequest request,
                   ServletResponse response, FilterChain chain)
            throws IOException, ServletException {

            try {
                HttpServletRequest httpServletRequest = ((HttpServletRequest) request);
            String requestURI = httpServletRequest.getRequestURI();

            if (requestURI.endsWith(".context")) {
                request.getRequestDispatcher(requestURI.concat(".htm"))
                    .forward(request,response);
            } else {
                chain.doFilter(httpServletRequest, response);
            }
       } catch (Exception ex) {
            request.setAttribute("errorMessage", ex);
            request.getRequestDispatcher("/WEB-INF/views/jsp/error.jsp")
                           .forward(request, response);
       }

}

添加

public class MyWebInitializer extends
        AbstractAnnotationConfigDispatcherServletInitializer {

    //...

    @Override
    protected Filter[] getServletFilters() {
        return new Filter[]{new RequestCheckFilter()};
    }
}

或在web.xml中

<filter>
    <filter-name>reqHandlerFilter</filter-name>
    <filter-class>RequestCheckFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>reqHandlerFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

拦截对控制器的请求的问题

1 个答案: