localeaction.java

软件开发过程通常包括五个阶段：分析、设计、编码、测试和发布。如果在Web应用开发中套用现成的Struts框架

/*
 * $Header: /home/cvs/jakarta-struts/src/examples/org/apache/struts/webapp/validator/LocaleAction.java,v 1.3 2004/03/14 06:23:49 sraeburn Exp $
 * $Revision: 1.3 $
 * $Date: 2004/03/14 06:23:49 $
 *
 * Copyright 2000-2004 The Apache Software Foundation.
 * 
 * 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.apache.struts.webapp.validator;

import java.util.Locale;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.Globals;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;


/**
 * Implementation of <strong>Action</strong> that changes the user's
 * @link(java.util.Locale and forwards to a page, based on request level
 * parameters that are set  (language, country, &amp; page).
 *
*/
public final class LocaleAction extends Action {

    /**
     * Commons Logging instance.
    */
    private Log log = LogFactory.getFactory().getInstance(this.getClass().getName());

    /**
     * <p>
     * Change the user's @link(java.util.Locale) based on @link(ActionForm)
     * properties.
     * </p>
     * <p>
     * This <code>Action</code> looks for <code>language</code> and
     * <code>country</code> properties on the given form, constructs an
     * appropriate Locale object, and sets it as the Struts Locale for this
     * user's session.
     * Any <code>ActionForm, including a @link(DynaActionForm), may be used.
     * </p>
     * <p>
     * If a <code>page</code> property is also provided, then after
     * setting the Locale, control is forwarded to that URI path.
     * Otherwise, control is forwarded to "success".
     * </p>
     *
     * @param mapping The ActionMapping used to select this instance
     * @param form The optional ActionForm bean for this request (if any)
     * @param request The HTTP request we are processing
     * @param response The HTTP response we are creating
     *
     * @return Action to forward to
     * @exception java.lang.Exception if an input/output error or servlet exception occurs
     */
    public ActionForward execute(ActionMapping mapping,
                 ActionForm form,
                 HttpServletRequest request,
                 HttpServletResponse response)
    throws Exception {

    // Extract attributes we will need
    HttpSession session = request.getSession();
    Locale locale = getLocale(request);

    String language = null;
    String country = null;
    String page = null;

    try {
            language = (String)
              PropertyUtils.getSimpleProperty(form, "language");
            country = (String)
              PropertyUtils.getSimpleProperty(form, "country");
            page = (String)
              PropertyUtils.getSimpleProperty(form, "page");
        } catch (Exception e) {
           log.error(e.getMessage(), e);
        }

        if ((language != null && language.length() > 0) &&
            (country != null && country.length() > 0)) {
           locale = new java.util.Locale(language, country);
        } else if (language != null && language.length() > 0) {
           locale = new java.util.Locale(language, "");
    }

        session.setAttribute(Globals.LOCALE_KEY, locale);

        if (null==page) return mapping.findForward("success");
        else return new ActionForward(page);

    }

}