用jxl导出资料创建多个sheet(克服大数据量的导出) (

<%@page import="jxl.write.WritableFont,jxl.write.WritableCellFormat,java.sql.ResultSetMetaData,java.io.*,jxl.write.Label,java.net.*,jxl.write.WritableCell,jxl.write.WritableWorkbook,
 java.util.*,com.running.crm.model.*,jxl.Workbook,jxl.write.WritableSheet"
 contentType="application/x-msdownload" pageEncoding="utf-8"%>
 <%
 OutputStream os = response.getOutputStream();
 WritableWorkbook wwb = Workbook.createWorkbook(os);
 Label label;
 response.setHeader("Content-disposition", "attachment; filename="+ URLEncoder.encode("客户资料", "utf-8") + ".xls");
 List customers=(List<Customer>)request.getAttribute("billResultSet");
 //String deptName=(String)request.getAttribute("deptName");
 int length=customers.size();//查询结果记录数
 int sheetSize=20000;
 int sheetNum=1;
 if(length%sheetSize>0){
    sheetNum=length/sheetSize+1;
 }else{
    sheetNum=length/sheetSize;
 }
 for(int kk=0;kk<sheetNum;kk++){
        WritableSheet ws=wwb.createSheet(("查询结果"+kk),kk); 
          //设定第一行的行高
         ws.setRowView(0,320);
         //将第一列的宽度设为20
        
         ws.setColumnView(0,15);
         ws.setColumnView(1,15);
         ws.setColumnView(2,20);
         ws.setColumnView(3,20);
         ws.setColumnView(4,20);
         ws.setColumnView(5,20);
         ws.setColumnView(6,20);
         ws.setColumnView(7,20);
       
            
  String ss[] = {"姓名","性别","手机号码","证件类型","证件号码","公司","家庭住址","爱好" };
   for (int i = 0; i < 8; i++) {
   WritableFont arial12pt = new WritableFont(WritableFont.ARIAL,11, WritableFont.BOLD);
   WritableCellFormat arial12format = new WritableCellFormat(arial12pt);
   arial12format.setWrap(false);
   label = new Label(i, 0, ss[i], arial12format);
   ws.addCell(label);
     }
   for(int i = kk*sheetSize; i< (kk+1)*sheetSize ; i++ ){
         if(i<length ){
                   Customer customer = (Customer) customers.get(i);
           for (int j = 0; j < 8; j++) {
            switch(j){
                case 0:label=new  Label(j, i+1-(kk*sheetSize), customer.getCustomerName());break;
                case 1:label=new  Label(j,i+1-(kk*sheetSize), customer.getCustomerSex());break;
                case 2:label=new  Label(j, i+1-(kk*sheetSize), customer.getPhoneNo());break;
              //  case 3:lable=new  Label(j, i, customer.getCategoryName());break;
                case 3:label=new  Label(j, i+1-(kk*sheetSize), customer.getCardType());break;
                case 4:label=new  Label(j, i+1-(kk*sheetSize), customer.getCardId());break;
                case 5:label=new  Label(j, i+1-(kk*sheetSize), customer.getCustomerCorp());break;
                case 6:label=new  Label(j, i+1-(kk*sheetSize), customer.getHomeAddr());break;
                case 7:label=new  Label(j, i+1-(kk*sheetSize), customer.getCustomerJoy());break;
                default:label=new Label(j,i+1-(kk*sheetSize),"");
               
            }
          
   ws.addCell(label);
  }
           }else{
                break;
            }
     }
  }
   wwb.write();
   wwb.close();
   os.close();
      out.clear();
      out = pageContext.pushBody();
   return;
%>
 

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http://blog.sina.com.cn/s/blog_4ba5b45e0100o5zt.html