spring SimpleServletHandlerAdapter 源码
spring SimpleServletHandlerAdapter 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/handler/SimpleServletHandlerAdapter.java
/*
* Copyright 2002-2021 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.handler;
import jakarta.servlet.Servlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.lang.Nullable;
import org.springframework.web.servlet.HandlerAdapter;
import org.springframework.web.servlet.ModelAndView;
/**
* Adapter to use the Servlet interface with the generic DispatcherServlet.
* Calls the Servlet's {@code service} method to handle a request.
*
* <p>Last-modified checking is not explicitly supported: This is typically
* handled by the Servlet implementation itself (usually deriving from
* the HttpServlet base class).
*
* <p>This adapter is not activated by default; it needs to be defined as a
* bean in the DispatcherServlet context. It will automatically apply to
* mapped handler beans that implement the Servlet interface then.
*
* <p>Note that Servlet instances defined as bean will not receive initialization
* and destruction callbacks, unless a special post-processor such as
* SimpleServletPostProcessor is defined in the DispatcherServlet context.
*
* <p><b>Alternatively, consider wrapping a Servlet with Spring's
* ServletWrappingController.</b> This is particularly appropriate for
* existing Servlet classes, allowing to specify Servlet initialization
* parameters etc.
*
* @author Juergen Hoeller
* @since 1.1.5
* @see jakarta.servlet.Servlet
* @see jakarta.servlet.http.HttpServlet
* @see SimpleServletPostProcessor
* @see org.springframework.web.servlet.mvc.ServletWrappingController
*/
public class SimpleServletHandlerAdapter implements HandlerAdapter {
@Override
public boolean supports(Object handler) {
return (handler instanceof Servlet);
}
@Override
@Nullable
public ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
((Servlet) handler).service(request, response);
return null;
}
@Override
@SuppressWarnings("deprecation")
public long getLastModified(HttpServletRequest request, Object handler) {
return -1;
}
}
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