springmvc组件HandlerAdapter源码-SimpleControllerHandlerAdapter
2021/9/21 20:10:41
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/* * Copyright 2002-2012 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * https://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.springframework.web.servlet.mvc; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.lang.Nullable; import org.springframework.web.servlet.HandlerAdapter; import org.springframework.web.servlet.ModelAndView; /** * 使用普通 {@link Controller} 工作流接口的适配器 * 通用的 {@link org.springframework.web.servlet.DispatcherServlet}。 * 支持实现 {@link LastModified} 接口的处理程序。 * * <p>这是一个SPI类,应用程序代码不直接使用。 * * @author Rod Johnson * @author Juergen Hoeller * @see org.springframework.web.servlet.DispatcherServlet * @see Controller * @see LastModified * @see HttpRequestHandlerAdapter */ public class SimpleControllerHandlerAdapter implements HandlerAdapter { @Override public boolean supports(Object handler) { return (handler instanceof Controller); } @Override @Nullable public ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { return ((Controller) handler).handleRequest(request, response); } @Override public long getLastModified(HttpServletRequest request, Object handler) { if (handler instanceof LastModified) { return ((LastModified) handler).getLastModified(request); } return -1L; } }
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