Struts2和common的fileupload实现文件上传并显示实时进度
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Struts2和common的fileupload实现文件上传并显示实时进度
参考连接http://blog.csdn.net/z69183787/article/details/52536255
基于AJAX的文件上传显示进度条实现参考连接
form表单设置为enctype=”multipart/form-data”，提交表单时：
后端获取参数就不能通过request.getParameter(“name”)来获取，而是通过 以下几种方式：
（1）request.getInputStream()来获取参数，但是这种方式如果有多个文件不太好处理；
（2）可以通过struts2框架的自动封装参数来获取，或者通过fileupload来获取；
1.前端页面代码：页面表单提交不跳转页面是通过隐藏iframe实现的
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";%><!DOCTYPE html><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>基于Ajax的上传文件显示进度条</title> <style> .prog-border { height: 15px; width: 205px; background: #fff; border: 1px solid #000; margin: 0; padding: 0; } .prog-bar { height: 11px; margin: 2px; padding: 0px; background: #178399; font-size: 10pt; } body{ font-family: Arial, Helvetica, sans-serif; font-size: 10pt; } </style> <script type="text/javascript"> //创建跨浏览器的XMLHttpRequest对象 var timer; function startListener(){ var xmlhttp; try{ //IE 5.0 xmlhttp = new ActiveXObject('Msxm12.XMLHTTP'); }catch(e){ try{ //IE 5.5 及更高版本 xmlhttp = new ActiveXObject('Microsoft.XMLHTTP'); }catch(e){ try{ //其他浏览器 xmlhttp = new XMLHttpRequest(); }catch(e){} } } var progressStatusText = document.getElementById("progressBar"); //获取上传的状态 xmlhttp.open("get","<%=basePath%>upload/getUploadStatus.action",true); //此处Header设置非常重要，必须设置Content-type类型，负责会报错误 xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); xmlhttp.onreadystatechange = function(){ if(xmlhttp.readyState == 4){ if(xmlhttp.status == 200){ progressStatusText.innerHTML = ""; progressStatusText.innerHTML = xmlhttp.responseText; var temp = xmlhttp.responseText.indexOf("success"); if ( temp > 0 ){ window.clearTimeout(timer); }else{ timer = window.setTimeout(startListener,1000); } } } } xmlhttp.send(null); } function startUpload(){ timer = window.setTimeout(startListener,1000); return true;} function cancelUpload(){ var xmlhttp; try{ //IE 5.0 xmlhttp = new ActiveXObject('Msxm12.XMLHTTP'); }catch(e){ try{ //IE 5.5 及更高版本 xmlhttp = new ActiveXObject('Microsoft.XMLHTTP'); }catch(e){ try{ //其他浏览器 xmlhttp = new XMLHttpRequest(); }catch(e){} } } var progressStatusText = document.getElementById("progressBar"); xmlhttp.open("get","<%=basePath%>upload/cancelFileUpload.action",true); xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); //xmlhttp.setRequestHeader("Content-type", "multipart/form-data"); xmlhttp.onreadystatechange = function(){ if(xmlhttp.readyState == 4){ if(xmlhttp.status == 200){ progressStatusText.innerHTML = ""; progressStatusText.innerHTML = xmlhttp.responseText; } } } xmlhttp.send(null); return false; } </script> </head> <body> <div id="controlPanel"> <!-- 这个是隐藏的<iframe>作为表单提交后处理的后台目标 通过表单form的target属性指定该<iframe>将返回信息显示在<iframe>框架中 --> <!-- --> <iframe id='target_upload' name='target_upload' src='' style='display: none'></iframe> <form id="fileUploadForm" name="fileUploadForm" action="<%=basePath%>upload/uploadFile.action" enctype="multipart/form-data" method="post" onsubmit="return startUpload();" target="target_upload"> 名字：<input type="text" name="name"/><br> 文件：<input type="file" name="file" id="file" size="40"/><br> <input type="submit" name="uploadButton" id="uploadButton" value="开始上传"/> <input type="button" name="cancelUploadButton" id="cancelUploadButton" value="取消上传" onclick="return cancelUpload();"/><br> </form> <div id="progressBar"> </div> </div></body> </html> 2.如果使用strut2框架和fileupload整合，必须配置request解析器，因为fileupload无法解析struts2封装过的request;
<!--使用没有被struts2封装过的request,可以在struts.xml中指定文件上传使用的request解析器 --> <bean type="org.apache.struts2.dispatcher.multipart.MultiPartRequest" name="myRequestParser" class="com.ming.upload.RequestParseWrapper" scope="default" optional="true" /> <constant name="struts.multipart.handler" value="myRequestParser" /> package com.ming.upload;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest;public class RequestParseWrapper extends JakartaMultiPartRequest{ //这里对parse方法进行了覆盖，使其无法封装request public void parse(HttpServletRequest servletRequest, String saveDir)throws IOException { } } 3.编写一个上传状态类，将其放入session中，这样前后端可以获取上传状态；
package com.ming.upload;import java.util.*; public class FileUploadStatus { //上传总量 private long uploadTotalSize=0; //读取上传总量 private long readTotalSize=0; //当前上传文件号 private int currentUploadFileNum=0; //成功读取上传文件数 private int successUploadFileCount=0; //状态 private String status=""; //处理起始时间 private long processStartTime=0l; //处理终止时间 private long processEndTime=0l; //处理执行时间 private long processRunningTime=0l; //上传文件URL列表 private List uploadFileUrlList=new ArrayList(); //取消上传 private boolean cancel=false; //上传base目录 private String baseDir=""; public String getBaseDir() { return baseDir; } public void setBaseDir(String baseDir) { this.baseDir = baseDir; } public boolean getCancel() { return cancel; } public void setCancel(boolean cancel) { this.cancel = cancel; } public List getUploadFileUrlList() { return uploadFileUrlList; } public void setUploadFileUrlList(List uploadFileUrlList) { this.uploadFileUrlList = uploadFileUrlList; } public long getProcessRunningTime() { return processRunningTime; } public void setProcessRunningTime(long processRunningTime) { this.processRunningTime = processRunningTime; } public long getProcessEndTime() { return processEndTime; } public void setProcessEndTime(long processEndTime) { this.processEndTime = processEndTime; } public long getProcessStartTime() { return processStartTime; } public void setProcessStartTime(long processStartTime) { this.processStartTime = processStartTime; } public long getReadTotalSize() { return readTotalSize; } public void setReadTotalSize(long readTotalSize) { this.readTotalSize = readTotalSize; } public int getSuccessUploadFileCount() { return successUploadFileCount; } public void setSuccessUploadFileCount(int successUploadFileCount) { this.successUploadFileCount = successUploadFileCount; } public int getCurrentUploadFileNum() { return currentUploadFileNum; } public void setCurrentUploadFileNum(int currentUploadFileNum) { this.currentUploadFileNum = currentUploadFileNum; } public String getStatus() { return status; } public void setStatus(String status) { this.status = status; } public long getUploadTotalSize() { return uploadTotalSize; } public void setUploadTotalSize(long uploadTotalSize) { this.uploadTotalSize = uploadTotalSize; } } 4.fileupload工具类ServletFileUpload可以设置一个监听器：
自定义监听器： 实现ProgressListener接口，并重写update方法
package com.ming.upload;import javax.servlet.http.HttpSession; import org.apache.commons.fileupload.ProgressListener; public class UploadListener implements ProgressListener { private HttpSession session=null; public UploadListener (HttpSession session){ this.session=session; } /** * 更新状态 * @param pBytesRead 读取字节总数 * @param pContentLength 数据总长度 * @param pItems 当前正在被读取的field号 */ @Override public void update(long pBytesRead, long pContentLength, int pItems) { FileUploadStatus fuploadStatus = UploadStatusUtil.takeOutFileUploadStatusBean(this.session); fuploadStatus.setUploadTotalSize(pContentLength); //读取完成 if (pContentLength == -1) { fuploadStatus.setStatus("完成对" + pItems + "个文件的读取：读取了 " + pBytesRead + "/" + pContentLength+ " bytes."); fuploadStatus.setReadTotalSize(pBytesRead); fuploadStatus.setCurrentUploadFileNum(pItems); fuploadStatus.setProcessEndTime(System.currentTimeMillis()); fuploadStatus.setProcessRunningTime(fuploadStatus.getProcessEndTime()); }else{//读取过程中 fuploadStatus.setStatus("当前正在处理第" + pItems+"个文件:已经读取了 " + pBytesRead + " / " + pContentLength+ " bytes."); fuploadStatus.setReadTotalSize(pBytesRead); fuploadStatus.setCurrentUploadFileNum(pItems); fuploadStatus.setProcessRunningTime(System.currentTimeMillis()); } //System.out.println("已经读取：" + pBytesRead); UploadStatusUtil.storeFileUploadStatusBean(this.session, fuploadStatus); } }UploadStatusUtil工具类：
package com.ming.upload;import javax.servlet.http.HttpSession;public class UploadStatusUtil { public static final String UPLOAD_STATUS="UPLOAD_STATUS"; public static final String UPLOAD_DIR="/upload"; /** * 把FileUploadStatus Bean保存到session * @param request * @param uploadStatusBean */ public static void storeFileUploadStatusBean( HttpSession session, FileUploadStatus uploadStatusBean){ session.setAttribute(UPLOAD_STATUS,uploadStatusBean); } /** * 从request中取出FileUploadStatus Bean * @param request * @return */ public static FileUploadStatus takeOutFileUploadStatusBean(HttpSession session){ Object obj=session.getAttribute(UploadStatusUtil.UPLOAD_STATUS); if (obj!=null){ return (FileUploadStatus)obj; } else{ return null; } } }5.编写action类：
package com.ming.upload;import java.io.File;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.apache.struts2.ServletActionContext;import org.apache.struts2.interceptor.ServletRequestAware;import org.apache.struts2.interceptor.ServletResponseAware;import com.opensymphony.xwork2.ActionSupport; public class UploadStatusAction extends ActionSupport implements ServletRequestAware, ServletResponseAware{ static final long serialVersionUID = 1L; private HttpServletRequest request; private HttpServletResponse response; @Override public void setServletRequest(HttpServletRequest request) { this.request = request; } @Override public void setServletResponse(HttpServletResponse response) { this.response = response; } /** * * @Title: uploadFile * @Description: TODO(上传文件) * @return void 返回类型 * @throws ServletException * @throws IOException */ public void uploadFile(){ try { //判断文件类型 boolean isMultipart = ServletFileUpload.isMultipartContent(request); if (isMultipart) { //上传文件并记录上传状态到session,并响应信息 DiskFileItemFactory factory = new DiskFileItemFactory(); //设置内存阀值，超过后写入临时文件 //factory.setSizeThreshold(10240000*5); //设置临时文件存储位置 //factory.setRepository(new File(request.getRealPath("/upload/temp"))); ServletFileUpload upload = new ServletFileUpload(factory); //设置单个文件的最大上传size //upload.setFileSizeMax(10240000*5); //设置整个request的最大size //upload.setSizeMax(10240000*5); //注册监听类 upload.setProgressListener(new UploadListener(request.getSession())); //保存初始化后的FileUploadStatus Bean UploadStatusUtil.storeFileUploadStatusBean(request.getSession(),initFileUploadStatusBean(request)); try { //注意必须重写strut2的request解析方法，struts2封装的request，fileupload无法正确解析 List<FileItem> items = upload.parseRequest(request); //处理文件上传 for(int i=0;i<items.size();i++){ FileItem item = items.get(i); //取消上传 if (UploadStatusUtil.takeOutFileUploadStatusBean(request.getSession()).getCancel()){ deleteUploadedFile(request); break; } //保存文件 else if (!item.isFormField() && item.getName().length()>0){ String fileName=takeOutFileName(item.getName()); String path = ServletActionContext.getServletContext().getRealPath( UploadStatusUtil.UPLOAD_DIR); File uploadedFile = new File(path + File.separator + fileName); item.write(uploadedFile); //更新上传文件列表 FileUploadStatus fUploadStatus = UploadStatusUtil.takeOutFileUploadStatusBean(request.getSession()); if(fUploadStatus != null) { fUploadStatus.getUploadFileUrlList().add(fileName); UploadStatusUtil.storeFileUploadStatusBean(request.getSession(), fUploadStatus); } Thread.sleep(500); } } } catch (FileUploadException e) { e.printStackTrace(); uploadExceptionHandle(request,"上传文件时发生错误:"+e.getMessage()); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); uploadExceptionHandle(request,"保存上传文件时发生错误:"+e.getMessage()); } } } catch (ServletException | IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally { //清除session中的上传状态对象 request.getSession().removeAttribute(UploadStatusUtil.UPLOAD_STATUS); } } /** * * @Title: getUploadStatus * @Description: TODO(获取上传状态信息) * @return void 返回类型 */ public void getUploadStatus(){ try { request.setCharacterEncoding("UTF-8"); FileUploadStatus fUploadStatus=(FileUploadStatus)request.getSession().getAttribute(UploadStatusUtil.UPLOAD_STATUS); //计算上传完成的百分比 long percentComplete = (long)Math.floor(((double) fUploadStatus.getReadTotalSize()/(double) fUploadStatus.getUploadTotalSize())*100.0); System.out.println("com:"+percentComplete); response.setContentType("text/xml"); response.setCharacterEncoding("UTF-8"); response.setHeader("Cache-Control", "no-cache"); if ( ((long)fUploadStatus.getReadTotalSize() == (long)fUploadStatus.getUploadTotalSize()) || (fUploadStatus.getCancel() == true)){ response.getWriter().write(fUploadStatus.getStatus().toString()+"success"); }else{ response.getWriter().write(fUploadStatus.getStatus().toString()+"<div class=\"prog-border\"><div class=\"prog-bar\" style=\"width: " + percentComplete + "%;\"></div></div>"); } } catch (IOException e) { e.printStackTrace(); } } /** * * @Title: cancelFileUpload * @Description: TODO(取消上传) * @return void 返回类型 * @return */ public void cancelFileUpload(){ try { request.setCharacterEncoding("UTF-8"); FileUploadStatus fUploadStatus=(FileUploadStatus)request.getSession().getAttribute(UploadStatusUtil.UPLOAD_STATUS); fUploadStatus.setCancel(true); request.getSession().setAttribute(UploadStatusUtil.UPLOAD_STATUS, fUploadStatus); //调用获取状态方法 getUploadStatus(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } finally { //清除session中的上传状态对象 request.getSession().removeAttribute(UploadStatusUtil.UPLOAD_STATUS); } } /** * 从文件路径中取出文件名 * @param filePath * @return */ private String takeOutFileName(String filePath){ int pos=filePath.lastIndexOf(File.separator); if (pos>0){ return filePath.substring(pos+1); } else{ return filePath; } } /** * 删除已经上传的文件 * @param request */ private void deleteUploadedFile(HttpServletRequest request){ FileUploadStatus fUploadStatus= UploadStatusUtil.takeOutFileUploadStatusBean(request.getSession()); for(int i=0;i<fUploadStatus.getUploadFileUrlList().size();i++){ String path = ServletActionContext.getServletContext().getRealPath( UploadStatusUtil.UPLOAD_DIR); File uploadedFile = new File(path+ File.separator+fUploadStatus.getUploadFileUrlList().get(i)); uploadedFile.delete(); } fUploadStatus.getUploadFileUrlList().clear(); fUploadStatus.setStatus("删除已上传的文件"); UploadStatusUtil.storeFileUploadStatusBean(request.getSession(),fUploadStatus); } /** * 上传过程中出错处理 * @param request * @param errMsg * @throws IOException * @throws ServletException */ private void uploadExceptionHandle( HttpServletRequest request, String errMsg) throws ServletException, IOException{ //首先删除已经上传的文件 deleteUploadedFile(request); FileUploadStatus fUploadStatus=UploadStatusUtil.takeOutFileUploadStatusBean(request.getSession()); fUploadStatus.setStatus(errMsg); UploadStatusUtil.storeFileUploadStatusBean(request.getSession(),fUploadStatus); } /** * 初始化文件上传状态Bean * @param request * @return */ private FileUploadStatus initFileUploadStatusBean(HttpServletRequest request){ FileUploadStatus fUploadStatus=new FileUploadStatus(); fUploadStatus.setStatus("正在准备处理"); fUploadStatus.setUploadTotalSize(request.getContentLength()); fUploadStatus.setProcessStartTime(System.currentTimeMillis()); fUploadStatus.setBaseDir(request.getContextPath()+UploadStatusUtil.UPLOAD_DIR); return fUploadStatus; } } 5.配置文件：
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"><struts> <package name="upload" namespace="/upload" extends="struts-default"> <result-types> <result-type name="json" class="org.apache.struts2.json.JSONResult"/> </result-types> <action name="upload" class="com.ming.upload.UploadAction"> </action> <action name="ajaxUpload" method="ajaxUpload" class="com.ming.upload.AjaxUploadAction"> </action> <action name="uploadFile" method="uploadFile" class="com.ming.upload.UploadStatusAction"> </action> <action name="getUploadStatus" method="getUploadStatus" class="com.ming.upload.UploadStatusAction"> </action> <action name="cancelFileUpload" method="cancelFileUpload" class="com.ming.upload.UploadStatusAction"> </action> </package></struts>阅读全文
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