struts2上传文件进度条显示

/* * $Id: JakartaMultiPartRequest.java 1099157 2011-05-03 17:53:55Z jogep $ * * 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. */ package util; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.Collections; import java.util.Enumeration; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.RequestContext; import org.apache.commons.fileupload.disk.DiskFileItem; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.struts2.ServletActionContext; import org.apache.struts2.StrutsConstants; import org.apache.struts2.dispatcher.multipart.MultiPartRequest; import com.opensymphony.xwork2.inject.Inject; import com.opensymphony.xwork2.util.logging.Logger; import com.opensymphony.xwork2.util.logging.LoggerFactory; /** * Multipart form data request adapter for Jakarta Commons Fileupload package. */ public class MyMultiPartRequest implements MultiPartRequest { static final Logger LOG = LoggerFactory.getLogger(MultiPartRequest.class); // maps parameter name -> List of FileItem objects protected Map<String,List<FileItem>> files = new HashMap<String,List<FileItem>>(); // maps parameter name -> List of param values protected Map<String,List<String>> params = new HashMap<String,List<String>>(); // any errors while processing this request protected List<String> errors = new ArrayList<String>(); protected long maxSize; @Inject(StrutsConstants.STRUTS_MULTIPART_MAXSIZE) public void setMaxSize(String maxSize) { this.maxSize = Long.parseLong(maxSize); } /** * Creates a new request wrapper to handle multi-part data using methods adapted from Jason Pell's * multipart classes (see class description). * * @param saveDir the directory to save off the file * @param request the request containing the multipart * @throws java.io.IOException is thrown if encoding fails. */ public void parse(HttpServletRequest request, String saveDir) throws IOException { FileListener listener = new FileListener(request); DiskFileItemFactory fac = new DiskFileItemFactory(); // Make sure that the data is written to file fac.setSizeThreshold(0); if (saveDir != null) { fac.setRepository(new File(saveDir)); } try { ServletFileUpload upload = new ServletFileUpload(fac); upload.setProgressListener(listener); upload.setSizeMax(maxSize); List items=upload.parseRequest(this.createRequestContext(request)); processUpload(request, saveDir); for (Object item1 : items) { FileItem item = (FileItem) item1; if (LOG.isDebugEnabled()) LOG.debug("Found item " + item.getFieldName()); if (item.isFormField()) { LOG.debug("Item is a normal form field"); List<String> values; if (params.get(item.getFieldName()) != null) { values = params.get(item.getFieldName()); } else { values = new ArrayList<String>(); } String charset = request.getCharacterEncoding(); if (charset != null) { values.add(item.getString(charset)); } else { values.add(item.getString()); } params.put(item.getFieldName(), values); } else { LOG.debug("Item is a file upload"); // Skip file uploads that don't have a file name - meaning // that no file was selected. if (item.getName() == null || item.getName().trim().length() < 1) { LOG.debug("No file has been uploaded for the field: " + item.getFieldName()); continue; } List<FileItem> values; if (files.get(item.getFieldName()) != null) { values = files.get(item.getFieldName()); } else { values = new ArrayList<FileItem>(); } values.add(item); files.put(item.getFieldName(), values); } } } catch (FileUploadException e) { errors.add(e.getMessage()); } } private void processUpload(HttpServletRequest request, String saveDir) throws FileUploadException, UnsupportedEncodingException { for (FileItem item : parseRequest(request, saveDir)) { if (LOG.isDebugEnabled()) { LOG.debug("Found item " + item.getFieldName()); } if (item.isFormField()) { processNormalFormField(item, request.getCharacterEncoding()); } else { processFileField(item); } } } private void processFileField(FileItem item) { if (LOG.isDebugEnabled()) { LOG.debug("Item is a file upload"); } // Skip file uploads that don't have a file name - meaning that no file was selected. if (item.getName() == null || item.getName().trim().length() < 1) { LOG.debug("No file has been uploaded for the field: " + item.getFieldName()); return; } List<FileItem> values; if (files.get(item.getFieldName()) != null) { values = files.get(item.getFieldName()); } else { values = new ArrayList<FileItem>(); } values.add(item); files.put(item.getFieldName(), values); } private void processNormalFormField(FileItem item, String charset) throws UnsupportedEncodingException { if (LOG.isDebugEnabled()) { LOG.debug("Item is a normal form field"); } List<String> values; if (params.get(item.getFieldName()) != null) { values = params.get(item.getFieldName()); } else { values = new ArrayList<String>(); } // note: see http://jira.opensymphony.com/browse/WW-633 // basically, in some cases the charset may be null, so // we're just going to try to "other" method (no idea if this // will work) if (charset != null) { values.add(item.getString(charset)); } else { values.add(item.getString()); } params.put(item.getFieldName(), values); } private List<FileItem> parseReq