90706b698469001b17ebfb69563bbe4c

《精通SOA：基于服务总线的Struts+EJB+Web Service整合应用开发》原书的实例代码

/*
 * $Id: UploadForm.java 54929 2004-10-16 16:38:42Z germuska $ 
 *
 * Copyright 1999-2004 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.upload;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.*;
import org.apache.struts.upload.FormFile;
import org.apache.struts.upload.MultipartRequestHandler;

/**
 * This class is a placeholder for form values.  In a multipart request, files are represented by
 * set and get methods that use the class org.apache.struts.upload.FormFile, an interface with
 * basic methods to retrieve file information.  The actual structure of the FormFile is dependant
 * on the underlying impelementation of multipart request handling.  The default implementation
 * that struts uses is org.apache.struts.upload.CommonsMultipartRequestHandler.
 *
 * @version $Rev: 54929 $ $Date: 2004-10-16 17:38:42 +0100 (Sat, 16 Oct 2004) $
 */
public class UploadForm extends ActionForm {
    
    /**
     * The value of the text the user has sent as form data
     */
    protected String theText;

    /**
     * The value of the embedded query string parameter
     */
    protected String queryParam;

    /**
     * Whether or not to write to a file
     */
    protected boolean writeFile;

    /**
     * The file that the user has uploaded
     */
    protected FormFile theFile;

    /**
     * The file path to write to
     */
    protected String filePath;

    /**
     * Retrieve the value of the text the user has sent as form data
     */
    public String getTheText() {
        return theText;
    }

    /**
     * Set the value of the form data text
     */
    public void setTheText(String theText) {
        this.theText = theText;
    }

    /**
     * Retrieve the value of the query string parameter
     */
    public String getQueryParam() {
        return queryParam;
    }

    /**
     * Set the value of the query string parameter
     */
    public void setQueryParam(String queryParam) {
        this.queryParam = queryParam;
    }

    /**
     * Retrieve a representation of the file the user has uploaded
     */
    public FormFile getTheFile() {
        return theFile;
    }

    /**
     * Set a representation of the file the user has uploaded
     */
    public void setTheFile(FormFile theFile) {
        this.theFile = theFile;
    }

    /**
     * Set whether or not to write to a file
     */
    public void setWriteFile(boolean writeFile) {
        this.writeFile = writeFile;
    }

    /**
     * Get whether or not to write to a file
     */
    public boolean getWriteFile() {
        return writeFile;
    }

    /**
     * Set the path to write a file to
     */
    public void setFilePath(String filePath) {
        this.filePath = filePath;
    }

    /**
     * Get the path to write a file to
     */
    public String getFilePath() {
        return filePath;
    }

    public void reset() {
        writeFile = false;
    }

    /**
     * Check to make sure the client hasn't exceeded the maximum allowed upload size inside of this
     * validate method.
     */
    public ActionErrors validate(
        ActionMapping mapping,
        HttpServletRequest request) {
            
        ActionErrors errors = null;
        //has the maximum length been exceeded?
        Boolean maxLengthExceeded =
            (Boolean) request.getAttribute(
                MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED);
                
        if ((maxLengthExceeded != null) && (maxLengthExceeded.booleanValue())) {
            errors = new ActionErrors();
            errors.add(
                ActionMessages.GLOBAL_MESSAGE ,
                new ActionMessage("maxLengthExceeded"));
            errors.add(
                ActionMessages.GLOBAL_MESSAGE ,
                new ActionMessage("maxLengthExplanation"));
        }
        return errors;

    }
}