multiimageform.java

用jbuilder写的源程序

/**
 * Copyright 2003-2006 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 com.jdon.strutsutil.file;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;
import org.apache.struts.upload.MultipartRequestHandler;

import java.util.*;

/**
 * 一次性上传多个图片Form
 *
 * 可以Override本ActionForm,设计自己的UploadImageForm
 *
 * 1. 配置如下
 * <form-bean name="uploadForm" type="com.jdon.strutsutil.file.UploadImageForm" />
 * 2 .注意，需要配置上传文件大小限制，在struts-config.xml有：
 * <controller maxFileSize="100K" />
 * 3. 配置ApplicationResoureces
 * maxLengthExceeded=The maximum upload length has been exceeded by the client.
 * notImage=this is not Image.
 *
 * <p>Copyright: Jdon.com Copyright (c) 2003</p>
 * <p></p>
 * @author banq
 * @version 1.0
 */
public class MultiImageForm extends ActionForm {
  public final static String module = MultiImageForm.class.getName();

  /** 每张图片大小，由 struts-config.xml maxFileSize 设置 */
  private static  String ERROR_PROPERTY_MAX_LENGTH_EXCEEDED =
      "com.jdon.strutsutil.file.MaxLengthExceeded";

  /** 最多图片数 是2  */
  public static int MAX_IMAGES_COUNT = 2;


  private Map fileMap = new HashMap();
  private Map nameMap = new HashMap();

  public FormFile getFile( int index ){
      return (FormFile) fileMap.get( new Integer( index ) );
  }

  public void setFile(int index, FormFile file){
    fileMap.put(new Integer(index), file);
  }

  public FormFile[] getFiles(){
      return (FormFile[])fileMap.values().toArray(new FormFile[fileMap.size()]);
  }

  public String getName( int index ){
      return (String)nameMap.get( new Integer( index ) );
  }

  public void setName(int index, String name){
    nameMap.put(new Integer(index), name);
  }

  public String[] getNames(){
      return (String[])nameMap.values().toArray(new String[0]);
  }




  /**
   * 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(ERROR_PROPERTY_MAX_LENGTH_EXCEEDED,
                 new ActionMessage("maxLengthExceeded"));
    }else if (fileMap.size()> MAX_IMAGES_COUNT){
      errors = new ActionErrors();
      errors.add(ERROR_PROPERTY_MAX_LENGTH_EXCEEDED,
                 new ActionMessage("maxLengthExceeded"));
    }else{
      //retrieve the file name
      Iterator iter = fileMap.values().iterator();
      while(iter.hasNext()){
        FormFile file = (FormFile)iter.next();
        String fileName = file.getFileName();
        if ( (!fileName.toLowerCase().endsWith(".gif")) &&
            ! (fileName.toLowerCase().endsWith(".jpg")) &&
            ! (fileName.toLowerCase().endsWith(".png"))) {
          errors = new ActionErrors();
          errors.add("notImage", new ActionMessage("notImage"));
        }
      }
    }
    return errors;
  }

}