如何解决在jsp页面上导入.xls文件报错问题

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在jsp页面上导入.xls文件，报错：
java.io.IOException: Posted content type isn't multipart/form-data
at com.oreilly.servlet.multipart.MultipartParser.<init>(MultipartParser.java:166)
at com.oreilly.servlet.MultipartRequest.<init>(MultipartRequest.java:222)
at org.apache.jsp.dxt.sms.multi_005fsender.upload_jsp._jspService(upload_jsp.java:406)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at sdcncsi.ict.security.AclFilter.doFilter(AclFilter.java:78)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at sdcncsi.ict.web.RequestFilter.doFilter(RequestFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
不知道是什么原因？应该怎样来解决呢？
解决这个错误，需要在form表单里面加上加enctype=”multipart/form-data” 这个属性，不过表单请求传到另一个jsp或servlet里时，是不能用request.getParameter()来获取到各个表单元素的值的，如下：

复制代码代码如下:

 
<%@ 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_sender&accountid=<%=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> 