jsp多文件上传遇到问题

  这是我的Action  不知道为什么，上传到目录的时候，都是一个叫Content-Disposition的空白文件，0KB,不知道为什么
package uppower.action;

import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class UploadAction extends Action {

public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
//jsp文件上传源码，单一或多文件也可与其他标单类型混杂使用，可不限制上传大小，速度一流
//作者：jjcc  2007.10.26
/*Connection con=DriverManager.getConnection("org.gjt.mm.mysql.Driver","gonglin","gonglin");
Statement St_xh=con.createStatement();
//设置上传服务器路径
String mypath_m =application.getRealPath("D:\\temp\\");
if((System.getProperty("os.name").toLowerCase().indexOf("sun"))>-1)
{
  mypath_m+="/docup/";
}
else
{
  mypath_m