如何解决在jsp页面上导入.xls文件报错问题

%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
%@ page session="false"%>
%@ include file="/common/taglibs.jsp"%>
%@ include file="/common/meta.jsp"%>
%@ include file="/common/js.jsp"%>
%@ page import="java.util.*"%>
%@ page import="java.text.SimpleDateFormat"%>
%@ page import="sdcncsi.ict.util.SysPara"%>
%@page import="java.io.*,java.util.*,sdcncsi.ict.base.attachment.*"%>
%@ page import="sdcncsi.ict.util.RequestUtil"%>
%@page import="com.oreilly.servlet.MultipartRequest"%>
%
String res="true";
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html; charset=UTF-8");
String file=(String)request.getParameter("t_file_excel");
//System.out.println(file);
String accountid3=(String)request.getParameter("accountid3");
String saveDirectory = "";
//获取配置参数,文件类型,文件大小
/*String date = "";
SimpleDateFormat gs = new SimpleDateFormat("yyyyMMdd");
Date now = new Date();
date = gs.format(now);*/
FileFuns fileFuns = new FileFuns();
try {
//判断文件类型
String file_type=SysPara.getValue("dxt_sms_multi_sender_file_type");
if(!file.substring(file.lastIndexOf(".")+1).equals(file_type))
{
out.println("script>");
out.println("alert('错误：文件类型错误！');");
out.println("/script>");
return;
}
//判断文件夹是否存在，不存在创建
String file_path = SysPara.getValue("dxt_sms_multi_sender_file_path");
file_path=file_path.replace("\\","//");
if (!fileFuns.getFileIsExists(file_path)) {
fileFuns.Createdir(file_path);
}
String file_size = SysPara.getValue("dxt_sms_multi_sender_file_size");
//文件上传后，保存在saveDirectory
saveDirectory = file_path;
RandomFileRenamePolicy rfrp = new RandomFileRenamePolicy();
MultipartRequest multi = null;
System.out.println("saveDirectory"+saveDirectory);
System.out.println("file_size"+file_size);
multi = new MultipartRequest(request, saveDirectory, Integer
.parseInt(file_size), "utf-8", rfrp);
System.out.println("222"+multi);
//输出反馈信息
Enumeration files = multi.getFileNames();
while (files.hasMoreElements()) {
String name = (String) files.nextElement();
File f = multi.getFile(name);
if (f != null) {
String fileName = multi.getFilesystemName(name);
saveDirectory+=fileName;
}
}
} catch (Exception eu) {
res="false";
eu.printStackTrace();
out.println("script>");
out.println("alert('错误：文件大小超出限制！');");
out.println("/script>");
}
%>
head>
script type="text/javascript">
function myunload(){
window.opener.callback_getPageData_table_list(1);
}
/script>
base target="_self">
/head>
body onunload="myunload()">
a id="reload" href='' style="display:none">/a>
/body>
script>
var res='%=res%>';
if(res=='true')
{
sys_ajaxPost("/dxt/multi_sender.do?method=importmulti_senderaccountid=%=accountid3%>excelpath=%=saveDirectory %>","",function(msg){
if(msg.result==true){
location.href="${ctx}/dxt/sms/multi_sender/multi_sender.jsp?result=true";
}else{
location.href="${ctx}/dxt/sms/multi_sender/multi_sender.jsp?result=false";
}
});
}
/script>