Source Code Cross Referenced for HttpRequestHandler.java in  » J2EE » spring-framework-2.5 » org » springframework » web » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.web 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 2002-2006 the original author or authors.
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *      http://www.apache.org/licenses/LICENSE-2.0
09:         *
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */
16:
17:        package org.springframework.web;
18:
19:        import java.io.IOException;
20:
21:        import javax.servlet.ServletException;
22:        import javax.servlet.http.HttpServletRequest;
23:        import javax.servlet.http.HttpServletResponse;
24:
25:        /**
26:         * Plain handler interface for components that process HTTP requests,
27:         * analogous to a Servlet. Only throws ServletException and IOException,
28:         * to allow for usage within any HttpServlet. Essentially the direct
29:         * equivalent of an HttpServlet, reduced to a handle method.
30:         *
31:         * <p>The easiest way to expose an HttpRequestHandler bean in Spring style
32:         * is to define it in Spring's root web application context and define
33:         * an HttpRequestHandlerServlet in <code>web.xml</code>, pointing at the
34:         * target HttpRequestHandler bean through its servlet-name which needs
35:         * to match the target bean name.
36:         *
37:         * <p>Supported as a handler type within Spring's DispatcherServlet,
38:         * being able to leverage the dispatcher's advanced mapping and interception
39:         * facilities. This is the recommended way of exposing an HttpRequestHandler,
40:         * while keeping the handler implementations free of direct dependencies
41:         * on a DispatcherServlet environment.
42:         *
43:         * <p>Typically implemented to generate binary responses directly,
44:         * with no separate view resource involved. This differentiates it from
45:         * a Controller within Spring's Web MVC framework. The lack of a ModelAndView
46:         * return value gives a clearer signature to callers other than the
47:         * DispatcherServlet, indicating there will never be a view to render.
48:         *
49:         * <p>As of Spring 2.0, Spring's HTTP-based remote exporters, such as
50:         * HttpInvokerServiceExporter and HessianServiceExporter, implement this
51:         * interface rather than the more extensive Controller interface,
52:         * for minimal dependencies on Spring-specific web infrastructure.
53:         *
54:         * <p>Note that RequestHandlers can optionally implement the LastModified
55:         * interface, just like Controllers can, provided that they run within
56:         * Spring's DispatcherServlet.
57:         *
58:         * @author Juergen Hoeller
59:         * @since 2.0
60:         * @see org.springframework.web.context.support.HttpRequestHandlerServlet
61:         * @see org.springframework.web.servlet.DispatcherServlet
62:         * @see org.springframework.web.servlet.ModelAndView
63:         * @see org.springframework.web.servlet.mvc.Controller
64:         * @see org.springframework.web.servlet.mvc.LastModified
65:         * @see org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter
66:         * @see org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter
67:         * @see org.springframework.remoting.caucho.HessianServiceExporter
68:         * @see org.springframework.remoting.caucho.BurlapServiceExporter
69:         */
70:        public interface HttpRequestHandler {
71:
72:            /**
73:             * Process the given request, generating a response.
74:             * @param request current HTTP request
75:             * @param response current HTTP response
76:             * @throws ServletException in case of general errors
77:             * @throws IOException in case of I/O errors
78:             */
79:            void handleRequest(HttpServletRequest request,
80:                    HttpServletResponse response) throws ServletException,
81:                    IOException;
82:
83:        }
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