setXXXContentType() 
getXXXFileName() 
getXXXContentType() 
setXXXFileName() 
getXXXFile() 
setXXXFile()

public String intercept(ActionInvocation invocation)  throws Exception { 
                ActionContext ac = invocation.getInvocationContext(); 

                HttpServletRequest request = (HttpServletRequest) ac.get(ServletActionContext.HTTP_REQUEST); 

                 if (!(request  instanceof MultiPartRequestWrapper)) { 
                         if (LOG.isDebugEnabled()) { 
                                ActionProxy proxy = invocation.getProxy(); 
                                LOG.debug(getTextMessage( "struts.messages.bypass.request",  new Object[]{proxy.getNamespace(), proxy.getActionName()}, ac.getLocale())); 
                        } 

                         return invocation.invoke(); 
                } 

                ValidationAware validation =  null; 

                Object action = invocation.getAction(); 

                 if (action  instanceof ValidationAware) { 
                        validation = (ValidationAware) action; 
                } 

                MultiPartRequestWrapper multiWrapper = (MultiPartRequestWrapper) request; 

                 if (multiWrapper.hasErrors()) { 
                         for (String error : multiWrapper.getErrors()) { 
                                 if (validation !=  null) { 
                                        validation.addActionError(error); 
                                } 

                                LOG.warn(error); 
                        } 
                } 

                 // bind allowed Files 
                Enumeration fileParameterNames = multiWrapper.getFileParameterNames(); 
                Map<String,List<Map<String,Object>>> fileParameterMap =  new HashMap<String,List<Map<String,Object>>>(); //文件值对 //zhaogy 
                 while (fileParameterNames !=  null && fileParameterNames.hasMoreElements()) { 
                         // get the value of this input tag 
                        String inputName = (String) fileParameterNames.nextElement(); 
                         
                         // get the content type 
                        String[] contentType = multiWrapper.getContentTypes(inputName); 
                         
                         if (isNonEmpty(contentType)) { 
                                 // get the name of the file from the input tag 
                                String[] fileName = multiWrapper.getFileNames(inputName); 

                                 if (isNonEmpty(fileName)) { 
                                         // get a File object for the uploaded File 
                                        File[] files = multiWrapper.getFiles(inputName); 
                                         if (files !=  null && files.length > 0) { 
                                                List<File> acceptedFiles =  new ArrayList<File>(files.length); 
                                                List<String> acceptedContentTypes =  new ArrayList<String>(files.length); 
                                                List<String> acceptedFileNames =  new ArrayList<String>(files.length); 
                                                List<String> renderNames =  new ArrayList<String>(files.length); 
                                                String contentTypeName = inputName +  "ContentType"; 
                                                String fileNameName = inputName +  "FileName"; 
                                                 for ( int index = 0; index < files.length; index++) { 
                                                         if (acceptFile(action, files[index], fileName[index], contentType[index], inputName, validation, ac.getLocale())) { 
                                                                acceptedFiles.add(files[index]); 
                                                                acceptedContentTypes.add(contentType[index]); 
                                                                acceptedFileNames.add(fileName[index]); 
                                                                List<Map<String, Object>> vfl= null; 
                                                                 if(fileParameterMap.containsKey(inputName)){ //是否已存在 
                                                                  vfl = fileParameterMap.get(inputName); 
                                                                } else{ 
                                                                  vfl =  new ArrayList<Map<String,Object>>(); 
                                                                  fileParameterMap.put(inputName, vfl); 
                                                                } 
                                                                  Map<String, Object> value =  new HashMap<String,Object>(); 
                                                                  value.put( "contentType", contentType[index]); 
                                                                  value.put( "fileName", fileName[index]); 
                                                                  value.put( "acceptedFile", files[index]); 
                  vfl.add(value); 
                                                                 
                                                        } 
                                                } 

                                                 if (!acceptedFiles.isEmpty()) { 
                                                        Map<String, Object> params = ac.getParameters(); 
                                                        params.put(inputName, acceptedFiles.toArray( new File[acceptedFiles.size()])); 
                                                        params.put(contentTypeName, acceptedContentTypes.toArray( newString[acceptedContentTypes.size()])); 
                                                        params.put(fileNameName, acceptedFileNames.toArray( new String[acceptedFileNames.size()])); 
                                                        params.put( "fileParameterMap", fileParameterMap); // zhaogy 
                                                } 
                                        } 
                                }  else { 
                                        LOG.warn(getTextMessage(action,  "struts.messages.invalid.file",  new Object[]{inputName}, ac.getLocale())); 
                                } 
                        }  else { 
                                LOG.warn(getTextMessage(action,  "struts.messages.invalid.content.type",  new Object[]{inputName}, ac.getLocale())); 
                        } 
                } 

                 // invoke action 
                String result = invocation.invoke(); 

                 // cleanup 
                fileParameterNames = multiWrapper.getFileParameterNames(); 
                 while (fileParameterNames !=  null && fileParameterNames.hasMoreElements()) { 
                        String inputValue = (String) fileParameterNames.nextElement(); 
                        File[] files = multiWrapper.getFiles(inputValue); 

                         for (File currentFile : files) { 
                                 if (LOG.isInfoEnabled()) { 
                                        LOG.info(getTextMessage(action,  "struts.messages.removing.file",  new Object[]{inputValue, currentFile}, ac.getLocale())); 
                                } 

                                 if ((currentFile !=  null) && currentFile.isFile()) { 
                                         if (currentFile.delete() ==  false) { 
                                                LOG.warn( "Resource Leaking:    Could not remove uploaded file '" + currentFile.getCanonicalPath() +  "'."); 
                                        } 
                                } 
                        } 
                } 

                 return result; 
        }

/* 

* $Id: MultipleFileUploadUsingListAction.java 660522 2008-05-27 14:08:00Z jholmes $ 

* 

* 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. 

*/ 
// START SNIPPET: entire-file 
package org.apache.struts2.showcase.fileupload; 
import java.io.File; 
import java.util.ArrayList; 
import java.util.Iterator; 
import java.util.List; 
import java.util.Map; 

import com.opensymphony.xwork2.ActionSupport; 

/** 

* Showcase action - multiple file upload using List 

* @version $Date: 2008-05-27 16:08:00 +0200 (Tue, 27 May 2008) $ $Id: MultipleFileUploadUsingListAction.java 660522 2008-05-27 14:08:00Z jholmes $ 

*/ 
public  class MultipleFileUploadUsingListAction  extends ActionSupport { 

         private List<File> uploads =  new ArrayList<File>(); 
         private List<String> uploadFileNames =  new ArrayList<String>(); 
         private List<String> uploadContentTypes =  new ArrayList<String>(); 

   public  void setFileParameterMap( 
      Map<String, List<Map<String, Object>>> fileParameterMap) { 
     this.fileParameterMap = fileParameterMap; 
  } 
   public List<File> getUpload() { 
                 return  this.uploads; 
        } 
         public  void setUpload(List<File> uploads) { 
                 this.uploads = uploads; 
        } 

         public List<String> getUploadFileName() { 
                 return  this.uploadFileNames; 
        } 
         
         
         public  void setUploadFileName(List<String> uploadFileNames) { 
                 this.uploadFileNames = uploadFileNames; 
        } 

         public List<String> getUploadContentType() { 
                 return  this.uploadContentTypes; 
        } 
         public  void setUploadContentType(List<String> contentTypes) { 
                 this.uploadContentTypes = contentTypes; 
        } 
         private Map<String,List<Map<String,Object>>> fileParameterMap; 

         public Map<String, List<Map<String, Object>>> getFileParameterMap() { 
     return fileParameterMap; 
  } 
         
         public String upload()  throws Exception { 
          Iterator<String> iter =  this.fileParameterMap.keySet().iterator(); 
     while(iter.hasNext()){ 
             String key = iter.next(); 
             List<Map<String, Object>>    vs =  this.fileParameterMap.get(key); 
             System.out.println( "key========"+key); 
              for(Map<String, Object> v : vs){ 
                Object contentType = v.get( "contentType"); 
                Object fileName = v.get( "fileName"); 
              Object file =    v.get( "acceptedFile"); 
              System.out.println( "contentType>>"+contentType); 
              System.out.println( "fileName>>"+fileName); 
              System.out.println( "file>>"+file); 
             } 
          } 
//                System.out.println("\n\n upload1"); 
//                System.out.println("files:"); 
//                for (File u: uploads) { 
//                        System.out.println("*** "+u+"\t"+u.length()); 
//                } 
//                System.out.println("filenames:"); 
//                for (String n: uploadFileNames) { 
//                        System.out.println("*** "+n); 
//                } 
//                System.out.println("content types:"); 
//                for (String c: uploadContentTypes) { 
//                        System.out.println("*** "+c); 
//                } 
//                System.out.println("\n\n"); 
                 return SUCCESS; 
        } 
} 
// END SNIPPET: entire-file