AJAX实现进度条
public class UploadListener implements OutputStreamListener
{
private HttpServletRequest request;
private long delay = 0;
private long startTime = 0;
private int totalToRead = 0;
private int totalBytesRead = 0;
private int totalFiles = -1;
public UploadListener(HttpServletRequest request, long
debugDelay)
{
this.request = request;
this.delay = debugDelay;
totalToRead = request.getContentLength();
this.startTime = System.currentTimeMillis();
}
public void start()
{
totalFiles ++;
updateUploadInfo("start");
}
public void bytesRead(int bytesRead)
{
totalBytesRead = totalBytesRead + bytesRead;
updateUploadInfo("progress");
try
{
Thread.sleep(delay);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}
public void error(String message)
{
updateUploadInfo("error");
}
public void done()
{
updateUploadInfo("done");
}
private long getDelta()
{
return (System.currentTimeMillis() - startTime) / 1000;
}
private void updateUploadInfo(String status)
{
long delta = (System.currentTimeMillis() - startTime) / 1000;
request.getSession().setAttribute("uploadInfo", new UploadInfo(totalFiles, totalToRead, totalBytesRead,delta,status));
}
}
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upload.jsp:
<%@ page
import="be.telio.mediastore.ui.upload.MonitoredDiskFileItemFactory" %>
<%@ page import="be.telio.mediastore.ui.upload.UploadListener" %> <%@ page import="org.apache.commons.fileupload.FileItem" %> <%@ page import="org.apache.commons.fileupload.FileItemFactory" %> <%@ page
import="org.apache.commons.fileupload.FileUploadException" %> <%@ page
import="org.apache.commons.fileupload.servlet.ServletFileUpload" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <%--
/* Licence:
* Use this however/wherever you like, just don't blame me if it breaks anything.
*
* Credit:
* If you're nice, you'll leave this bit:
*
* Class by Pierre-Alexandre Losson -- * email : plosson@users.sourceforge.net
*/
--%>
<%
UploadListener listener = new UploadListener(request, 30);
// Create a factory for disk-based file items
FileItemFactory factory = new
MonitoredDiskFileItemFactory(listener);
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
try
{
// process uploads ..
upload.parseRequest(request);
//....??ÀíÉÏ??ÎÄ?þ
}
catch (FileUploadException e)
{
e.printStackTrace(); //To change body of catch statement use
File | Settings | File Templates.
}
%>