Spring Framework example source code file (HttpRequestHandlerServlet.java)

This example Spring Framework source code file (HttpRequestHandlerServlet.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Spring Framework tags/keywords

allow, http, httprequesthandler, httprequesthandler, httprequesthandlerservlet, httprequestmethodnotsupportedexception, httprequestmethodnotsupportedexception, httpservlet, httpservletresponse, io, ioexception, ioexception, request, response, servlet, servletexception, servletexception, string, webapplicationcontext

The Spring Framework HttpRequestHandlerServlet.java source code

/*
 * Copyright 2002-2008 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
 *
 *      http://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.context.support;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.util.StringUtils;
import org.springframework.web.HttpRequestHandler;
import org.springframework.web.HttpRequestMethodNotSupportedException;
import org.springframework.web.context.WebApplicationContext;

/**
 * Simple HttpServlet that delegates to an {@link HttpRequestHandler} bean defined
 * in Spring's root web application context. The target bean name must match the
 * HttpRequestHandlerServlet servlet-name as defined in <code>web.xml.
 *
 * <p>This can for example be used to expose a single Spring remote exporter,
 * such as {@link org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter}
 * or {@link org.springframework.remoting.caucho.HessianServiceExporter},
 * per HttpRequestHandlerServlet definition. This is a minimal alternative
 * to defining remote exporters as beans in a DispatcherServlet context
 * (with advanced mapping and interception facilities being available there).
 *
 * @author Juergen Hoeller
 * @since 2.0
 * @see org.springframework.web.HttpRequestHandler
 * @see org.springframework.web.servlet.DispatcherServlet
 */
public class HttpRequestHandlerServlet extends HttpServlet {

	private HttpRequestHandler target;


	public void init() throws ServletException {
		WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
		this.target = (HttpRequestHandler) wac.getBean(getServletName(), HttpRequestHandler.class);
	}


	protected void service(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		try {
			this.target.handleRequest(request, response);
		}
		catch (HttpRequestMethodNotSupportedException ex) {
			String[] supportedMethods = ((HttpRequestMethodNotSupportedException) ex).getSupportedMethods();
			if (supportedMethods != null) {
				response.setHeader("Allow", StringUtils.arrayToDelimitedString(supportedMethods, ", "));
			}
			response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, ex.getMessage());
		}
	}

}