1. 引言
2. 實現代碼
2.1. 服務器端代碼
2.1.1. 文件上傳狀態類(FileUploadStatus)
2.1.2. 文件上傳狀態偵聽類(FileUploadListener)
2.1.3. 後台服務類(BackGroundService)
2.1.4. 文件上傳狀態控制類(BeanControler)
2.2. 客戶端代碼
2.2.1. AJaxWrapper.JS
2.2.2. fileUpload.Html
2.2.3. result.JSP
2.2.4. fileUpload.CSS
2.3. 配置文件
3. 結語
1. 引言
返回
基於浏覽器的文件上傳,特別是對於通過<input type="file">標簽來實現上傳的情況,
存在著嚴重的性能問題,因為用戶提交了文件之後,在浏覽器把文件上傳到服務器的過程中,界面看上去
似乎是靜止的,如果是小文件還好些,如果不幸需要上傳的是幾兆、幾十兆甚至上百兆的文件,我相信那是
一種非常痛苦的體驗,我們中間的很多人應該都有過此種不堪的經歷。(一笑)
現在我就針對這個問題給出一個解決方案,我們將實現一個具有監控能力的WEB上傳的程序——它不僅
把文件上傳到服務器,而且"實時地"監視文件上傳的實際過程。
解決方案的基本思路是這樣的:
在Form提交上傳文件同時,使用AJax周期性地從Servlet輪詢上傳狀態信息
然後,根據此信息更新進度條和相關文字,及時反映文件傳輸狀態
如果用戶取消上傳操作,則進行相應的現場清理工作:刪除已經上傳的文件,在Form提交頁面中顯示相關信息
如果上傳完畢,顯示已經上傳的文件內容(或鏈接)
在介紹源代碼之前,我們先來看看程序運行界面:
實現代碼想當然的有服務器端代碼和客戶端代碼(呵呵),我們先從服務器端開始。
使用FileUploadStatus這個類記錄文件上傳狀態,並將其作為服務器端與web客戶端之間通信的媒介,通過對這個類對象提供上傳狀態作為服務器回應發送給web客戶端,web客戶端使用JavaScript獲得文件上傳狀態。源代碼如下:
/**
* 本例程演示了通過Web上傳文件過程中的進度顯示。您可以對本例程進行任何修改和使用。
*
* 如需要轉載,請注明作者。
*
* 作者: 劉作晨
*
*/
package liuzuochen.sample.upload;
import Java.util.*;
public class FileUploadStatus {
//上傳用戶地址
private String uploadAddr;
//上傳總量
private long uploadTotalSize = 0;
//讀取上傳總量
private long readTotalSize = 0;
//當前上傳文件號
private int currentUploadFileNum = 0;
//成功讀取上傳文件數
private int successUploadFileCount = 0;
//狀態
private String status = "";
//處理起始時間
private long processStartTime = 0l;
//處理終止時間
private long processEndTime = 0l;
//處理執行時間
private long processRunningTime = 0l;
//上傳文件URL列表
private List uploadFileUrlList = new ArrayList();
//取消上傳
private boolean cancel = false;
//上傳base目錄
private String baseDir = "";
public FileUploadStatus() {
}
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 String getUploadAddr() {
return uploadAddr;
}
public void setUploadTotalSize(long uploadTotalSize) {
this.uploadTotalSize = uploadTotalSize;
}
public void setUploadAddr(String uploadAddr) {
this.uploadAddr = uploadAddr;
}
public String toJSon() {
StringBuffer strJSon = new StringBuffer();
strJSon.append("
{UploadTotalSize:").append(getUploadTotalSize()).append(
",")
.append
("ReadTotalSize:").append(getReadTotalSize()).append
(",")
.append
("CurrentUploadFileNum:").append(getCurrentUploadFileNum()).
append(",")
.append
("SuccessUploadFileCount:").append(
getSuccessUploadFileCount()).append(",").append
("Status:'").append(getStatus()).append("',").append
("ProcessStartTime:").append(getProcessStartTime()).append(",")
.append("ProcessEndTime:").append(getProcessEndTime()).append(",")
.append("ProcessRunningTime:").append(getProcessRunningTime()).
append(",").append("Cancel:").append(getCancel()).append("}");
return strJSon.toString();
}
}
使用Common-FileUpload 1.2版本(20070103)。此版本提供了能夠監視文件上傳情況的 ProcessListener接口,
使開發者通過FileUploaDBase類對象的setProcessListener方法植入自己的Listener。
FileUploadListener類實現了ProcessListener,在整個文件上傳過程中,它對上傳進度進行監控,
並且根據上傳 情況實時的更新上傳狀態Bean。源代碼如下:
/**
* 本例程演示了通過Web上傳文件過程中的進度顯示。您可以對本例程進行任何修改和使用。
*
* 如需要轉載,請注明作者。
*
* 作者: 劉作晨
*
*/
package liuzuochen.sample.upload;
import org.apache.commons.fileupload.ProgressListener;
import Javax.servlet.http.HttpServletRequest;
public class FileUploadListener implements ProgressListener{
private HttpServletRequest request=null;
public FileUploadListener(HttpServletRequest request){
this.request=request;
}
/**
* 更新狀態
*/
public void update(long pBytesRead, long pContentLength, int pItems){
FileUploadStatus statusBean= BackGroundService.getStatusBean(request);
statusBean.setUploadTotalSize(pContentLength);
//讀取完成
if (pContentLength == -1) {
statusBean.setStatus("完成對" + pItems +"個文件的讀取:讀取了 " + pBytesRead + " bytes.");
statusBean.setReadTotalSize(pBytesRead);
statusBean.setSuccessUploadFileCount(pItems);
statusBean.setProcessEndTime(System.currentTimeMillis());
statusBean.setProcessRunningTime(statusBean.getProcessEndTime());
//讀取中
} else {
statusBean.setStatus("當前正在處理第" + pItems +"個文件:已經讀取了 " + pBytesRead + " / " + pContentLength+ " bytes.");
statusBean.setReadTotalSize(pBytesRead);
statusBean.setCurrentUploadFileNum(pItems);
statusBean.setProcessRunningTime(System.currentTimeMillis());
}
BackGroundService.saveStatusBean(request,statusBean);
}
}
BackGroundService這個Servlet類負責接收Form Post數據、回應狀態輪詢請求、處理取消文件上傳的請求。
盡管可以把這些功能相互分離開來,但為了簡單明了,還是將它們放到Servlet中,只是由不同的方法進行分割。
源代碼如下:
/**
* 本例程演示了通過Web上傳文件過程中的進度顯示。您可以對本例程進行任何修改和使用。
*
* 如需要轉載,請注明作者。
*
* 作者: 劉作晨
*
*/
package liuzuochen.sample.upload;
import Java.io.File;
import Java.io.IOException;
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.*;
public class BackGroundService extends javax.servlet.http.HttpServlet implementsJavax.servlet.Servlet {
public static final String UPLOAD_DIR = "/upload";
public static final String DEFAULT_UPLOAD_FAILURE_URL = "./result.JSP";
public BackGroundService() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException {
doPost(request, response);
}
/**
* 從文件路徑中取出文件名
*/
private String takeOutFileName(String filePath) {
int pos = filePath.lastIndexOf(File.separator);
if (pos > 0) {
return filePath.substring(pos + 1);
} else {
return filePath;
}
}
/**
* 從request中取出FileUploadStatus Bean
*/
public static FileUploadStatus getStatusBean(
HttpServletRequest request) {
BeanControler beanCtrl = BeanControler.getInstance();
return beanCtrl.getUploadStatus(request.getRemoteAddr());
}
/**
* 把FileUploadStatus Bean保存到類控制器BeanControler
*/
public static void saveStatusBean(HttpServletRequest request,FileUploadStatus statusBean) {
statusBean.setUploadAddr(request.getRemoteAddr());
BeanControler beanCtrl = BeanControler.getInstance();
beanCtrl.setUploadStatus(statusBean);
}
/**
* 刪除已經上傳的文件
*/
private void deleteUploadedFile(HttpServletRequest request) {
FileUploadStatus satusBean = getStatusBean(request);
for (int i = 0; i < satusBean.getUploadFileUrlList().size(); i++) {
File uploadedFile = new File(request.getRealPath(UPLOAD_DIR) + File.separator + satusBean.getUploadFileUrlList(). get(i));
uploadedFile.delete();
}
satusBean.getUploadFileUrlList().clear();
satusBean.setStatus("刪除已上傳的文件");
saveStatusBean(request, satusBean);
}
/**
* 上傳過程中出錯處理
*/
private void uploadExceptionHandle(HttpServletRequest request,String errMsg) throws ServletException, IOException {
//首先刪除已經上傳的文件
deleteUploadedFile(request);
FileUploadStatus satusBean = getStatusBean(request);
satusBean.setStatus(errMsg);
saveStatusBean(request, satusBean);
}
/**
* 初始化文件上傳狀態Bean
*/
private FileUploadStatus initStatusBean(HttpServletRequest
request) {
FileUploadStatus satusBean = new FileUploadStatus();
satusBean.setStatus("正在准備處理");
satusBean.setUploadTotalSize(request.getContentLength());
satusBean.setProcessStartTime(System.currentTimeMillis());
satusBean.setBaseDir(request.getContextPath() + UPLOAD_DIR);
return satusBean;
}
/**
* 處理文件上傳
*/
private void processFileUpload(HttpServletRequest request,
HttpServletResponse response) throwsServletException, IOException {
DiskFileItemFactory factory = new DiskFileItemFactory();
//設置內存緩沖區,超過後寫入臨時文件
factory.setSizeThreshold(10240000);
//設置臨時文件存儲位置
factory.setRepository(new File(request.getRealPath("/upload/temp")));
ServletFileUpload upload = new ServletFileUpload(factory);
//設置單個文件的最大上傳值
upload.setFileSizeMax(102400000);
//設置整個request的最大值
upload.setSizeMax(102400000);
upload.setProgressListener(new FileUploadListener(request));
//保存初始化後的FileUploadStatus Bean
saveStatusBean(request, initStatusBean(request));
String forwardURL = "";
try {
List items = upload.parseRequest(request);
//獲得返回url
for (int i = 0; i < items.size(); i++) {
FileItem item = (FileItem) items.get(i);
if (item.isFormFIEld()) {
forwardURL = item.getString();
break;
}
}
//處理文件上傳
for (int i = 0; i < items.size(); i++) {
FileItem item = (FileItem) items.get(i);
//取消上傳
if (getStatusBean(request).getCancel()) {
deleteUploadedFile(request);
break;
}
//保存文件
else if (!item.isFormFIEld() && item.getName().length() > 0) {
String fileName = takeOutFileName(item.getName());
File uploadedFile = new File(request.getRealPath(UPLOAD_DIR) +
File.separator + fileName);item.write(uploadedFile);//更新上傳文件列表FileUploadStatus
satusBean =getStatusBean(request);
satusBean.getUploadFileUrlList().add(fileName);
saveStatusBean(request, satusBean);
Thread.sleep(500);
}
}
} catch (FileUploadException e) {
uploadExceptionHandle(request, "上傳文件時發生錯誤:" + e.getMessage());
} catch (Exception e) {
uploadExceptionHandle(request, "保存上傳文件時發生錯誤:" + e.getMessage());
}
if (forwardURL.length() == 0) {
forwardURL = DEFAULT_UPLOAD_FAILURE_URL;
}
request.getRequestDispatcher(forwardURL).forward(request, response);
}
/**
* 回應上傳狀態查詢
*/
private void responseStatusQuery(HttpServletRequest request,
HttpServletResponse response) throwsIOException {
response.setContentType("text/XML");
response.setCharacterEncoding("UTF-8");
response.setHeader("Cache-Control", "no-cache");
FileUploadStatus satusBean = getStatusBean(request);
response.getWriter().write(satusBean.toJSon());
}
/**
* 處理取消文件上傳
*/
private void processCancelFileUpload(HttpServletRequest request,
HttpServletResponse response) throwsIOException {
FileUploadStatus satusBean = getStatusBean(request);
satusBean.setCancel(true);
saveStatusBean(request, satusBean);
responseStatusQuery(request, response);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException,IOException {
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart) {
processFileUpload(request, response);
} else {
request.setCharacterEncoding("UTF-8");
if (request.getParameter("uploadStatus") != null) {
responseStatusQuery(request, response);
}
if (request.getParameter("cancelUpload") != null) {
processCancelFileUpload(request, response);
}
}
}
}
這是一個單例類,它的功能是為客戶端保存文件上傳狀態,這裡我沒有使用Session來存儲 文件上傳狀態,
因為對於AJax這種異步調用,服務器會開啟不同的Session,所以無法通過Session保存文件上傳狀態。
我並不認為這種方法最好,如果有更好的方法,歡迎大家一起討論。 源代碼如下:
/**
* 本例程演示了通過Web上傳文件過程中的進度顯示。您可以對本例程進行任何修改和使用。
*
* 如需要轉載,請注明作者。
*
* 作者: 劉作晨
*
*/
package liuzuochen.sample.upload;
import Java.util.Vector;
public class BeanControler {
private static BeanControler beanControler = new BeanControler();
private Vector vector = new Vector();
private BeanControler() {
}
public static BeanControler getInstance() {
return beanControler;
}
/**
* 取得相應FileUploadStatus類對象的存儲位置
*/
private int indexOf(String strID) {
int nReturn = -1;
for (int i = 0; i < vector.size(); i++) {
FileUploadStatus status = (FileUploadStatus) vector.elementAt(i);
if (status.getUploadAddr().equals(strID)) {
nReturn = i;
break;
}
}
return nReturn;
}
/**
* 取得相應FileUploadStatus類對象
*/
public FileUploadStatus getUploadStatus(String strID) {
return (FileUploadStatus) vector.elementAt(indexOf(strID));
}
/**
* 存儲FileUploadStatus類對象
*/
public void setUploadStatus(FileUploadStatus status) {
int nIndex = indexOf(status.getUploadAddr());
if ( -1 == nIndex) {
vector.add(status);
} else {
vector.insertElementAt(status, nIndex);
vector.removeElementAt(nIndex + 1);
}
}
/**
* 刪除FileUploadStatus類對象
*/
public void removeUploadStatus(String strID){
int nIndex = indexOf(strID);
if(-1!=nIndex)
vector.removeElementAt(nIndex);
}
}
客戶端我們采用Prototype框架。
AJaxWrapper.JS對Prototype進行了封裝。 源代碼如下:
//類工具
var ClassUtils=Class.create();
ClassUtils.prototype={
_ClassUtilsName:'ClassUtils',
initialize:function(){
},
/**
* 給類的每個方法注冊一個對類對象的自我引用
* @param reference 對類對象的引用
*/
registerFuncSelfLink:function(reference){
for (var n in reference) {
var item = reference[n];
if (item instanceof Function)
item.$ = reference;
}
}
}
//AJax操作封裝類:
//由於調用AJaxRequest類進行XMLHTTPRequest操作時,this引用(指向當前的對象)會出現了call stack問題,從而指向當前的對象。
//所以,對putRequest、callBackHandler、以及callback方法都要使用arguments.callee.$來獲得正確的類對象引用
var AJaxWrapper=Class.create();
AJaxWrapper.prototype={
debug_flag:false,
XML_source:'',
/**
* 初始化
* @param isDebug 是否顯示調試信息
*/
initialize:function(isDebug){
new ClassUtils().registerFuncSelfLink(this);
this.debug_flag=isDebug;
},
/**
* 以get的方式向server發送request
* @param url
* @param params
* @param callBackFunction 發送成功後回調的函數或者函數名
*/
putRequest:function(url,params,callBackFunction){
var funcHolder=arguments.callee.$;
var XMLHttp = new AJax.Request(url,
{
method: 'get',
parameters: params,
requestHeaders:['my-header-encoding','utf-8'],
onFailure: function(){
alert('對不起,網絡通訊失敗,請重新刷新!');
},
onSuccess: function(transport){
},
onComplete: function(transport){
funcHolder.callBackHandler.apply(funcHolder,[transport,callBackFunction]);
}
});
},
/**
* 以post的方式向server發送XML請求
* @param url
* @param postDataBody
* @param callBackFunction 發送成功後回調的函數或者函數名
*/
pushRequest:function(url,postDataBody,callBackFunction){
var funcHolder=arguments.callee.$;
var options={
method: 'post',
parameters:'',
requestHeaders:['my-header-encoding','utf-8'],
postBody: postDataBody,
onFailure: function(transport){
alert('對不起,網絡通訊失敗,請重新發送!');
},
onComplete: function(transport){
funcHolder.callBackHandler.apply(funcHolder,[transport,callBackFunction]);
}
};
var XMLHttp = new AJax.Request(url,options);
},
/**
* 遠程調用的回調處理
* @param transport XMLhttp的transport
* @param callBackFunction 回調時call的方法,可以是函數也可以是函數名
*/
callBackHandler:function(transport,callBackFunction){
var funcHolder=arguments.callee.$;
if(transport.status!=200){
alert("獲得回應失敗,請求狀態:"+transport.status);
}
else{
funcHolder.XML_source=transport.responseText;
if (funcHolder.debug_flag)
alert('call callback function');
if (typeof(callBackFunction)=='function'){
if (funcHolder.debug_flag){
alert('invoke callbackFunc');
}
callBackFunction(transport.responseText);
}
else{
if (funcHolder.debug_flag){
alert('evalFunc callbackFunc');
}
new execute().evalFunc(callBackFunction,transport.responseText);
}
if (funcHolder.debug_flag)
alert('end callback function');
}
},
//顯示XML信息
showXMLResponse:function(){
var funcHolder=arguments.callee.$;
alert(funcHolder.XML_source);
}
}
var XMLDomForAJax=Class.create();
XMLDomForAJax.prototype={
isDebug:false,
//dom節點類型常量
ELEMENT_NODE:1,
ATTRIBUTE_NODE:2,
TEXT_NODE:3,
CDATA_SECTION_NODE:4,
ENTITY_REFERENCE_NODE:5,
ENTITY_NODE:6,
PROCESSING_INSTRUCTION_NODE:7,
COMMENT_NODE:8,
DOCUMENT_NODE:9,
DOCUMENT_TYPE_NODE:10,
DOCUMENT_FRAGMENT_NODE:11,
NOTATION_NODE:12,
initialize:function(isDebug){
new ClassUtils().registerFuncSelfLink(this);
this.isDebug=isDebug;
},
/**
* 建立跨平台的dom解析器
* @param xml XML字符串
* @return dom解析器
*/
createDomParser:function(XML){
// code for IE
if (window.ActiveXObject){
var doc=new ActiveXObject("Microsoft.XMLDOM");
doc.async="false";
doc.loadXML(XML);
}
// code for Mozilla, Firefox, Opera, etc.
else{
var parser=new DOMParser();
var doc=parser.parseFromString(xml,"text/XML");
}
return doc;
},
/**
* 反向序列化XML到Javascript Bean
* @param xml XML字符串
* @return Javascript Bean
*/
deserializedBeanFromXML:function (XML){
var funcHolder=arguments.callee.$;
var doc=funcHolder.createDomParser(XML);
// documentElement總表示文檔的root
var objDomTree=doc.documentElement;
var obj=new Object();
for (var i=0; i0){
objFieldValue[objFIEldValue.length]=nodeText;
}
}
else{
objFIEldValue=new Array();
}
}
else if (node.getAttribute('type')=='long'
|| node.getAttribute('type')=='Java.lang.Long'
|| node.getAttribute('type')=='int'
|| node.getAttribute('type')=='Java.lang.Integer'){
objFIEldValue=parseInt(nodeText);
}
else if (node.getAttribute('type')=='double'
|| node.getAttribute('type')=='float'
|| node.getAttribute('type')=='Java.lang.Double'
|| node.getAttribute('type')=='Java.lang.Float'){
objFIEldValue=parseFloat(nodeText);
}
else if (node.getAttribute('type')=='Java.lang.String'){
objFIEldValue=nodeText;
}
else{
objFIEldValue=nodeText;
}
//賦值給對象
obj[node.getAttribute('name')]=objFIEldValue;
if (funcHolder.isDebug){
alert(eval('obj.'+node.getAttribute('name')));
}
}
else if (node.nodeType == funcHolder.TEXT_NODE){
if (funcHolder.isDebug){
//alert('TEXT_NODE');
}
}
else if (node.nodeType == funcHolder.CDATA_SECTION_NODE){
if (funcHolder.isDebug){
//alert('CDATA_SECTION_NODE');
}
}
}
return obj;
},
/**
* 獲得dom節點的text
*/
getNodeText:function (node) {
var funcHolder=arguments.callee.$;
// is this a text or CDATA node?
if (node.nodeType == funcHolder.TEXT_NODE || node.nodeType == funcHolder.CDATA_SECTION_NODE) {
return node.data;
}
var i;
var returnValue = [];
for (i = 0; i < node.childNodes.length; i++) {
//采用遞歸算法
returnValue.push(funcHolder.getNodeText(node.childNodes[i]));
}
return returnValue.join('');
}
}
//委托者類
var Dispatcher=Class.create();
Dispatcher.prototype={
name:'Dispatcher',
//對class中的每個function都賦值一個值為this的$屬性
initialize:function(){
new ClassUtils().registerFuncSelfLink(this);
},
/**
* 委托調用
* @param caller 調用者,func的擁有者
* @param func 如果是function對象,則使用Dispatcher對象自己的name作為參數;否則直接調用func
*/
dispatch:function(caller,func){
if (func instanceof Function){
var funcArguments=new Array();
funcArguments[0]=arguments.callee.$.name;
func.apply(caller,funcArguments);
}
else{
eval(func);
}
}
}
//祈禱者類
var Invoker=Class.create();
Invoker.prototype={
name:'Invoker',
initialize:function(){
},
invoke:function(showMsg){
alert(showMsg+"——this.name="+this.name);
}
}
fileUpload.Html是文件上傳界面。 源代碼如下:
<Html>
<head>
<meta http-equiv="Content-Type" content="text/Html; charset=GBK">
<script type="text/Javascript" src="./Javascript/prototype.JS"></script>
<script type="text/Javascript" src="./Javascript/AJaxWrapper.JS"></script>
<link href="./css/fileUpload.css" type="text/CSS" rel="stylesheet"/>
<title>文件上傳</title>
</head>
<body>
<div id="controlPanel">
<div id="readme">測試說明: 最大上傳量:100M,單個文件最大長度:100M</div>
<div id="uploadFileUrl"></div>
<form id="fileUploadForm" name="fileUploadForm" action="./BackGroundService.action"
enctype="multipart/form-data" method="post">
<input type="file" name="file" id="file" size="40"/><br>
<input type="file" name="file" id="file" size="40"/><br>
<input type="file" name="file" id="file" size="40"/><br>
<input type="submit" name="uploadButton" id="uploadButton" value="開始上傳"/>
<input type="button" name="cancelUploadButton" id="cancelUploadButton" value="取消上傳"/><br>
</form>
<div id="progressBar">
<div id="theMeter">
<div id="progressBarText"></div>
<div id="totalProgressBarBox">
<div id="totalProgressBarBoxContent"></div>
</div>
</div>
<div id="progressStatusText"></div>
</div>
</div>
<script>
Element.hide('progressBar');
Event.observe('fileUploadForm','submit',startProgress,false);
Event.observe('cancelUploadButton','click',cancelProgress,false);
//刷新上傳狀態
function refreshUploadStatus(){
var ajaxW = new AJaxWrapper(false);
AJaxW.putRequest(
'./BackGroundService.action',
'uploadStatus=',
function(responseText){
eval("uploadInfo = " + responseText);
var progressPercent = Math.ceil(
(uploadInfo.ReadTotalSize) / uploadInfo.UploadTotalSize * 100);
$('progressBarText').innerHtml = ' 上傳處理進度: '+progressPercent+'% ['+(uploadInfo.ReadTotalSize)+'/'+uploadInfo.UploadTotalSize + ' bytes]'+
' 正在處理第'+uploadInfo.CurrentUploadFileNum+'個文件'+
' 耗時: '+(uploadInfo.ProcessRunningTime-uploadInfo.ProcessStartTime)+' ms';
$('progressStatusText').innerHtml=' 反饋狀態: '+uploadInfo.Status;
$('totalProgressBarBoxContent').style.width = parseInt(progressPercent * 3.5) + 'px';
}
);
}
//上傳處理
function startProgress(){
Element.show('progressBar');
$('progressBarText').innerHtml = ' 上傳處理進度: 0%';
$('progressStatusText').innerHtml=' 反饋狀態:';
$('uploadButton').disabled = true;
var periodicalExe=new PeriodicalExecuter(refreshUploadStatus,0.5);
return true;
}
//取消上傳處理
function cancelProgress(){
$('cancelUploadButton').disabled = true;
var ajaxW = new AJaxWrapper(false);
AJaxW.putRequest(
'./BackGroundService.action',
'cancelUpload=true',
//因為form的提交,這可能不會執行
function(responseText){
eval("uploadInfo = " + responseText);
$('progressStatusText').innerHtml=' 反饋狀態: '+uploadInfo.status;
if (msgInfo.cancel=='true'){
alert('刪除成功!');
window.location.reload();
};
}
);
}
</script>
</body>
</Html>
result.JSP是文件上傳結果顯示界面。 源代碼如下:
<%@ page language="Java" contentType="text/Html; charset=GBK"pageEncoding="GBK"%>
<%@ page import="liuzuochen.sample.upload.*" %>
<Html>
<head>
<meta http-equiv="Content-Type" content="text/Html; charset=GBK">
<link href="./css/fileUpload.css" type="text/CSS" rel="stylesheet"/>
<title>文件上傳結果</title>
</head>
<body>
<div id="resultPanel">
<div><span>上傳文件列表:</span></div>
<%
FileUploadStatus fUploadStatus=BackGroundService.getStatusBean(request);
for(int i=0;i<fUploadStatus.getUploadFileUrlList().size();i++){
String fileName=(String)fUploadStatus.getUploadFileUrlList().get(i);
String url=fUploadStatus.getBaseDir()+"/"+fileName;
%>
<div><a href="<%=url%>"><%=fileName%></a></div>
<%
}
if (fUploadStatus.getStatus().indexOf("錯誤")>=0){
%>
<div id='errorArea'><span>錯誤信息:<%=fUploadStatus.getStatus() %></span></div>
<%
}
else if (fUploadStatus.getCancel()){
%>
<div id='normalMessageArea'><span>由於用戶取消上傳,所以已經上傳的文件均被刪除</span></div>
<%
}
BeanControler.getInstance().removeUploadStatus(request.getRemoteAddr());
%>
</div>
</body>
</Html>
fileUpload.CSS是樣式文件。 源代碼如下:
body {
color:#000;
background-color:white;
font:15px Georgia, "Lucida Grande", Arial, sans-serif;
letter-spacing:0.01em;
margin:15px;
}
#controlPanel,#resultPanel{
width:700px;
margin:20px auto;
padding:25px;
border:3px solid gray;
-moz-border-radius:10px;
background:#f8f8f8;
}
#errorArea{
width:400px;
margin:20px auto;
padding:25px;
border:3px solid gray;
-moz-border-radius:10px;
background:red;
}
#normalMessageArea{
width:400px;
margin:20px auto;
padding:25px;
border:3px solid gray;
-moz-border-radius:10px;
background:yellow;
}
#progressBar { padding-top: 5px; }
#totalProgressBarBox {
width: 350px;
height: 20px;
border: 1px inset;
background: #eee;
}
#totalProgressBarBoxContent {
width: 0;
height: 20px;
border-right: 1px solid #444;
background: #9ACB34;
}
把如下代碼加入web.XML中完成Servlet的配置。
<servlet>
<description>
</description>
<display-name>BackGroundService</display-name>
<servlet-name>BackGroundService</servlet-name>
<servlet-class>liuzuochen.sample.upload.BackGroundService</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BackGroundService</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>
整個程序到這裡就介紹完了,希望它多少能為您的工作或學習帶來點兒幫助。