Java上传文件进度条的实现方法(附demo源码下载)

package lc.progress;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import lc.progress.vo.fileUploadStatus;
import org.apache.commons.fileupload.ProgressListener;
public class myProgressListener implements ProgressListener {
  private HttpSession session;
  public myProgressListener(HttpServletRequest req) {
    session=req.getSession();
    fileUploadStatus status = new fileUploadStatus();
    session.setAttribute("status", status);
  }
  /* pBytesRead 到目前为止读取文件的比特数
   * pContentLength 文件总大小
   * pItems 目前正在读取第几个文件
   * 只要在session中实时保存文件上传的状态（这里我用fileUploadStatus类来封装）
   */
  public void update(long pBytesRead, long pContentLength, int pItems) {
    // TODO Auto-generated method stub
    fileUploadStatus status = (fileUploadStatus) session.getAttribute("status");
    status.setPBytesRead(pBytesRead);
    status.setPContentLength(pContentLength);
    status.setPItems(pItems);
  }
}

myProgressListener getBarListener = new myProgressListener(req);
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setProgressListener(getBarListener);