Struts example source code file (StrutsServlet.java)

This example Struts source code file (StrutsServlet.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 - Struts tags/keywords

actionmapping, dispatcher, executeoperations, http, httpservlet, initoperations, initoperations, io, ioexception, override, override, prepareoperations, request, response, servlet, servletexception, servletexception, servlethostconfig, servlethostconfig

The Struts StrutsServlet.java source code

/*
 * $Id: DefaultActionSupport.java 651946 2008-04-27 13:41:38Z apetrelli $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.struts2.dispatcher.ng.servlet;

import org.apache.struts2.dispatcher.Dispatcher;
import org.apache.struts2.dispatcher.ng.InitOperations;
import org.apache.struts2.dispatcher.ng.PrepareOperations;
import org.apache.struts2.dispatcher.ng.ExecuteOperations;
import org.apache.struts2.dispatcher.mapper.ActionMapping;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.*;
import java.io.IOException;

/**
 * Servlet dispatcher for Struts.  The preferred way to use Struts is as a filter via the
 * {@link org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter} and its variants.  This servlet dispatcher
 * is only for those that really know what they are doing as it may not support every feature of Struts, particularly
 * static resource serving.
 */
public class StrutsServlet extends HttpServlet {

    private PrepareOperations prepare;
    private ExecuteOperations execute;

    @Override
    public void init(ServletConfig filterConfig) throws ServletException {
        InitOperations init = new InitOperations();
        try {
            ServletHostConfig config = new ServletHostConfig(filterConfig);
            init.initLogging(config);
            Dispatcher dispatcher = init.initDispatcher(config);
            init.initStaticContentLoader(config, dispatcher);

            prepare = new PrepareOperations(filterConfig.getServletContext(), dispatcher);
            execute = new ExecuteOperations(filterConfig.getServletContext(), dispatcher);
        } finally {
            init.cleanup();
        }
    }

    @Override
    public void service(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {

        try {
            prepare.createActionContext(request, response);
            prepare.assignDispatcherToThread();
            prepare.setEncodingAndLocale(request, response);
            request = prepare.wrapRequest(request);
            ActionMapping mapping = prepare.findActionMapping(request, response);
            if (mapping == null) {
                boolean handled = execute.executeStaticResourceRequest(request, response);
                if (!handled)
                    throw new ServletException("Resource loading not supported, use the StrutsPrepareAndExecuteFilter instead.");
            } else {
                execute.executeAction(request, response, mapping);
            }
        } finally {
            prepare.cleanupRequest(request);
        }
    }

    @Override
    public void destroy() {
        prepare.cleanupDispatcher();
    }
}