requestutils.java

这是一个轻便的j2ee的web应用框架,是一个在多个项目中运用的实际框架,采用struts,hebinate,xml等技术,有丰富的tag,role,navigation,session,dictio

/*
 * $Header: /sfroot/cvs/esimple/src/core/org/apache/struts/util/RequestUtils.java,v 1.1.1.1 2004/09/08 06:38:44 lava Exp $
 * $Revision: 1.1.1.1 $
 * $Date: 2004/09/08 06:38:44 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Struts", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.struts.util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.DynaBean;
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.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.action.ActionServletWrapper;
import org.apache.struts.action.DynaActionForm;
import org.apache.struts.action.DynaActionFormClass;
import org.apache.struts.action.RequestProcessor;
import org.apache.struts.config.ActionConfig;
import org.apache.struts.config.FormBeanConfig;
import org.apache.struts.config.ForwardConfig;
import org.apache.struts.config.ModuleConfig;
import org.apache.struts.taglib.html.Constants;
import org.apache.struts.upload.MultipartRequestHandler;
import org.apache.struts.upload.MultipartRequestWrapper;

import com.esimple.framework.web.action.BaseForm;
/**
 * General purpose utility methods related to processing a servlet request
 * in the Struts controller framework.
 *
 * @author Craig R. McClanahan
 * @author Ted Husted
 * @author James Turner
 * @author David Graham
 * @version $Revision: 1.1.1.1 $ $Date: 2004/09/08 06:38:44 $
 */

public class RequestUtils {

    // ------------------------------------------------------- Static Variables

    /**
     * Commons Logging instance.
     */
    protected static Log log = LogFactory.getLog(RequestUtils.class);

    /**
     * The message resources for this package.
     */
    private static MessageResources messages =
        MessageResources.getMessageResources("org.apache.struts.util.LocalStrings");

    /**
     * The context attribute under which we store our prefixes list.
     */
    private static final String PREFIXES_KEY = "org.apache.struts.util.PREFIXES";
    
    /**
     * Java 1.4 encode method to use instead of deprecated 1.3 version.
     */
    private static Method encode = null;
    
    /**
     * Maps lowercase JSP scope names to their PageContext integer constant values. 
     */
    private static Map scopes = new HashMap();
    
    /**
     * Initialize the encode variable with the 1.4 method if available.  Also set up the
     * scope map values.
     */
    static {
        try {
            // get version of encode method with two String args 
            Class[] args = new Class[] { String.class, String.class };
            encode = URLEncoder.class.getMethod("encode", args);
        } catch (NoSuchMethodException e) {
            log.debug("Could not find Java 1.4 encode method.  Using deprecated version.", e);
        }
        
        scopes.put("page", new Integer(PageContext.PAGE_SCOPE));
        scopes.put("request", new Integer(PageContext.REQUEST_SCOPE));
        scopes.put("session", new Integer(PageContext.SESSION_SCOPE));
        scopes.put("application", new Integer(PageContext.APPLICATION_SCOPE));
    }

    // --------------------------------------------------------- Public Methods

    /**
     * Create and return an absolute URL for the specified context-relative
     * path, based on the server and context information in the specified
     * request.
     *
     * @param request The servlet request we are processing
     * @param path The context-relative path (must start with '/')
     * @return  absolute URL based on context-relative path
     * @exception MalformedURLException if we cannot create an absolute URL
     */
    public static URL absoluteURL(HttpServletRequest request, String path)
        throws MalformedURLException {

        return (new URL(serverURL(request), request.getContextPath() + path));

    }

    /**
     * Return the <code>Class</code> object for the specified fully qualified
     * class name, from this web application's class loader.
     *
     * @param className Fully qualified class name to be loaded
     * @return Class object
     * @exception ClassNotFoundException if the class cannot be found
     */
    public static Class applicationClass(String className) throws ClassNotFoundException {

        // Look up the class loader to be used
        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        if (classLoader == null) {
            classLoader = RequestUtils.class.getClassLoader();
        }

        // Attempt to load the specified class
        return (classLoader.loadClass(className));

    }

    /**
     * Return a new instance of the specified fully qualified class name,
     * after loading the class from this web application's class loader.
     * The specified class <strong>MUST</strong> have a public zero-arguments
     * constructor.
     *
     * @param className Fully qualified class name to use
     * @return new instance of class
     * @exception ClassNotFoundException if the class cannot be found
     * @exception IllegalAccessException if the class or its constructor
     *  is not accessible
     * @exception InstantiationException if this class represents an
     *  abstract class, an interface, an array class, a primitive type,
     *  or void
     * @exception InstantiationException if this class has no
     *  zero-arguments constructor
     */
    public static Object applicationInstance(String className)
        throws ClassNotFoundException, IllegalAccessException, InstantiationException {

        return (applicationClass(className).newInstance());

    }

    /**
     * Compute a set of query parameters that will be dynamically added to
     * a generated URL.  The returned Map is keyed by parameter name, and the
     * values are either null (no value specified), a String (single value
     * specified), or a String[] array (multiple values specified).  Parameter
     * names correspond to the corresponding attributes of the
     * <code>&lt;html:link&gt;</code> tag.  If no query parameters are
     * identified, return <code>null</code>.
     *
     * @param pageContext PageContext we are operating in

     * @param paramId Single-value request parameter name (if any)
     * @param paramName Bean containing single-value parameter value
     * @param paramProperty Property (of bean named by <code>paramName</code>
     *  containing single-value parameter value
     * @param paramScope Scope containing bean named by
     *  <code>paramName</code>
     *
     * @param name Bean containing multi-value parameters Map (if any)
     * @param property Property (of bean named by <code>name</code>
     *  containing multi-value parameters Map
     * @param scope Scope containing bean named by
     *  <code>name</code>
     *
     * @param transaction Should we add our transaction control token?
     * @return Map of query parameters
     * @exception JspException if we cannot look up the required beans
     * @exception JspException if a class cast exception occurs on a
     *  looked-up bean or property
     */
    public static Map computeParameters(
        PageContext pageContext,
        String paramId,
        String paramName,
        String paramProperty,
        String paramScope,
        String name,
        String property,
        String scope,
        boolean transaction)
        throws JspException {

        // Short circuit if no parameters are specified
        if ((paramId == null) && (name == null) && !transaction) {
            return (null);
        }

        // Locate the Map containing our multi-value parameters map
        Map map = null;
        try {
            if (name != null) {
                map = (Map) lookup(pageContext, name, property, scope);
            }
        } catch (ClassCastException e) {
            saveException(pageContext, e);
            throw new JspException(messages.getMessage("parameters.multi", name, property, scope));
        } catch (JspException e) {
            saveException(pageContext, e);
            throw e;
        }

        // Create a Map to contain our results from the multi-value parameters
        Map results = null;
        if (map != null) {
            results = new HashMap(map);
        } else {
            results = new HashMap();
        }
        
        // Add the single-value parameter (if any)
        if ((paramId != null) && (paramName != null)) {

            Object paramValue = null;
            try {
                paramValue = lookup(pageContext, paramName, paramProperty, paramScope);
            } catch (JspException e) {
                saveException(pageContext, e);
                throw e;
            }

            if (paramValue != null) {

                String paramString = null;
                if (paramValue instanceof String) {
                    paramString = (String) paramValue;
                } else {
                    paramString = paramValue.toString();
                }
                
                Object mapValue = results.get(paramId);
                if (mapValue == null) {
                    results.put(paramId, paramString);
                } else if (mapValue instanceof String) {
                    String newValues[] = new String[2];
                    newValues[0] = (String) mapValue;
                    newValues[1] = paramString;
                    results.put(paramId, newValues);
                } else /* if (mapValue instanceof String[]) */ {
                    String oldValues[] = (String[]) mapValue;
                    String newValues[] = new String[oldValues.length + 1];
                    System.arraycopy(oldValues, 0, newValues, 0, oldValues.length);