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JAVA excel

<%    
 response.setContentType("application/vnd.ms-excel;charset=utf-8");
 String  reportname = (String)request.getAttribute("reportname");
 String  reportFileName=java.net.URLEncoder.encode(reportname, "UTF-8");
 String  filenamedisplay =reportFileName+".xls";
 response.addHeader("Content-Disposition","attachment;filename=" + filenamedisplay);//Ôö¼ÓĬÈϱ£´æÎļþÃû 
 String  userid = (String)request.getAttribute("_fm_userid"); 
 int index=0;
%>
<html>
  <head>
    <title><%=reportname%>²é詢Áбí</title>    
 <meta http-equiv="pragma" content="no-cache">
 <meta http-equiv="cache-control" content="no-cache">
 <meta http-equiv="expires" content="0">   
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 <meta http-equiv="description" content="This is my page"> 
  </head>
<%
File file=new File("G:/Eclipse.pdf");//ÎļþÀàÐÍ ¿ÉÒÔΪPDF XLS DOC
FileInputStream in=new FileInputStream(file);
byte [] b=new byte[1024];
response.setContentType("application/pdf;charset=GB2312");//application/pdf  /msxml(excel)  /msword
//response.setHeader("Content-Disposition",   "attachment;   filename=9602.pdf");//ÏÂÔØ
int len;
while((len=in.read(b))>0)   
      response.getOutputStream().write(b,0,len);
%>
///////////////////////////////////////////////////////////////////
ÔÚweb.xmlÖмÓÈë
  <mime-mapping>
    <extension>doc</extension>
    <mime-type>application/msword</mime-type>
  </mime-mapping>
  <mime-mapping>
    <extension>xls</extension>
    <mime-type>application/msexcel&l


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