JSP导出Excel文件的方法

<%@page import="jxl.Workbook,com.ecc.emp.core.*,com.ecc.emp.data.*,com.ecc.emp.jdbc.ConnectionManager,jxl.format.VerticalAlignment,java.sql.*,jxl.write.*,jxl.format.UnderlineStyle,javax.sql.DataSource"%>
<%@page language="java" contentType="text/html; charset=UTF-8"%>
<%@taglib uri="/WEB-INF/CTP.tld" prefix="ctp"%>
<jsp:directive.page import="java.util.List"/>
<jsp:directive.page import="java.util.ArrayList"/>
<%@ include file="http://www.xxxx.com/head.jsp" %>
<%
 Context context = (Context)request.getAttribute("context");String flag ="交易日期,交易时间,摘要,借方发生额,贷方发生额,对方账号,对方户名,单位卡号,主卡标识,用途,备注";
 IndexedCollection indexedCollection = (IndexedCollection)context.getDataElement("parentCardDetails");
 String[] sourceStrArray=flag.split(",");
 List selValList = new ArrayList();
 selValList.add("序号#");
 for(int i=0;i<sourceStrArray.length;i++){
  selValList.add(sourceStrArray[i]+"#");
 }
 WritableWorkbook book = null;
 if (indexedCollection == null || indexedCollection.size()<0) 
 {%>
 <script language="javascript">
  alert('对不起!当前条件没有数据，不能导出!');
  //history.go(-1);
 </script>
 <%
 }
 else 
 {
  response.reset();
  response.setContentType("charset=UTF-8");
  response.setContentType("application/vnd.ms-excel");
  String filename = "regularInform.xls";
  response.setHeader("Content-Disposition","attachment; filename=" + filename);
  //解决HTTPS不能下载的问题
  response.setHeader("Cache-Control","public");
  book = Workbook.createWorkbook(response.getOutputStream());
  //表头字体
  WritableCellFormat writableCellFormat = new WritableCellFormat();
  writableCellFormat.setAlignment(Alignment.CENTRE);
  writableCellFormat.setVerticalAlignment(VerticalAlignment.CENTRE);
  writableCellFormat.setWrap(true);
  WritableFont cellFont = new WritableFont(WritableFont.createFont("宋体"), 14, WritableFont.BOLD, false,
  UnderlineStyle.NO_UNDERLINE, Colour.BLACK);
  writableCellFormat.setFont(cellFont);
  writableCellFormat.setBorder(Border.ALL,
  BorderLineStyle.THIN);
  writableCellFormat.setBackground(Colour.SKY_BLUE,
  Pattern.SOLID);
  //标题字体（左对齐）
  WritableCellFormat writableCellFormat1 = new WritableCellFormat();
  writableCellFormat1.setAlignment(Alignment.CENTRE);
  writableCellFormat1.setVerticalAlignment(VerticalAlignment.CENTRE);
  writableCellFormat1.setWrap(false);
  WritableFont cellFont1 = new WritableFont(WritableFont.createFont("宋体"), 14, WritableFont.NO_BOLD, false,
  UnderlineStyle.NO_UNDERLINE, Colour.BLACK);
  writableCellFormat1.setFont(cellFont1);
  //数据字体（居中）
  WritableCellFormat writableCellFormat2 = new WritableCellFormat();
  writableCellFormat2.setAlignment(Alignment.CENTRE);
  writableCellFormat2.setVerticalAlignment(VerticalAlignment.CENTRE);
  writableCellFormat2.setWrap(true);
  WritableFont cellFont2 = new WritableFont(WritableFont.createFont("宋体"), 10, WritableFont.NO_BOLD, false,
  UnderlineStyle.NO_UNDERLINE, Colour.BLACK);
  writableCellFormat2.setFont(cellFont2);
  writableCellFormat2.setBorder(Border.ALL,BorderLineStyle.THIN);
  WritableSheet sheet = book.createSheet("Sheet1", 0);
  sheet = setSheetHeader(sheet, writableCellFormat, selValList);
  int startRow = 2;
  Label label1 = null;
  int m = 0;
  sheet.mergeCells(0, 0, selValList.size()-1, 0);
  if(indexedCollection!=null && indexedCollection.size()>0)
   {  
      for (int i = 0; i < indexedCollection.size(); i++){  
       KeyedCollection keyedCollection = (KeyedCollection) indexedCollection.get(i);
        String TranDate=(String)keyedCollection.getDataValue("TranDate");//交易日期
        String tt = (String)keyedCollection.getDataValue("TranTime");
        tt = tt.substring(0,2)+":"+tt.substring(2,4);//交易时间
        String narr=utb.nvl(keyedCollection.getDataValue("narr"), "--");//摘要
        String entrAmt1=utb.formatMoney("DEBIT".equals((String)(keyedCollection.getDataValue("DCFlag")))"entrAmt")):"0.00");//借方发生额
        String entrAmt2=utb.formatMoney("DEBIT".equals((String)(keyedCollection.getDataValue("DCFlag")))"0.00":((String)keyedCollection.getDataValue("entrAmt")));//贷方发生额
        String OppAc=utb.nvl(keyedCollection.getDataValue("OppAc"), "--");//对方账号
        String OppacName=utb.nvl(keyedCollection.getDataValue("OppacName"), "--");//对方户名
        String TransCardNo=utb.nvl(keyedCollection.getDataValue("TransCardNo"), "--");//单位卡号
        String stdflag=(String)context.getDataValue("stdflag");
        String cardNo=(String)context.getDataValue("parentCardNo");
        String mainflag = "附";if(!"parent".equals(stdflag)){}else{mainflag = cardNo.equals((String)(keyedCollection.getDataValue("TransCardNo")))"主":"附";}//主卡标识
        String Usage=utb.nvl(keyedCollection.getDataValue("Usage"), "--");//用途
        String ReMark=utb.nvl(keyedCollection.getDataValue("ReMark"), "--");//备注
       int k = 0;
       sheet.setRowView(startRow, 450);
       label1 = new Label(k, startRow, (startRow-1)+"", writableCellFormat2);
       sheet.addCell(label1);
       k++;
       //(列，行，值，格式)
       label1 = new Label(k, startRow,TranDate, writableCellFormat2);
       sheet.addCell(label1);
       k++;
       label1 = new Label(k, startRow,tt, writableCellFormat2);
       sheet.addCell(label1);
       k++;
       label1 = new Label(k, startRow,narr, writableCellFormat2);
       sheet.addCell(label1);
       k++;
       label1 = new Label(k, startRow,entrAmt1, writableCellFormat2);
       sheet.addCell(label1);
       k++;
       label1 = new Label(k, startRow,entrAmt2, writableCellFormat2);
       sheet.addCell(label1);
       k++;
       label1 = new Label(k, startRow,OppAc, writableCellFormat2);
       sheet.addCell(label1);
       k++;
       label1 = new Label(k, startRow,OppacName, writableCellFormat2);
       sheet.addCell(label1);
       k++;
       label1 = new Label(k, startRow,TransCardNo, writableCellFormat2);
       sheet.addCell(label1);
       k++;
       label1 = new Label(k, startRow,mainflag, writableCellFormat2);
       sheet.addCell(label1);
       k++;
       label1 = new Label(k, startRow,Usage, writableCellFormat2);
       sheet.addCell(label1);
       k++;
       label1 = new Label(k, startRow,ReMark, writableCellFormat2);
       sheet.addCell(label1);
       k++;
       startRow = startRow+1;
       }
       }
   book.write();
   try {
    book.close();
    response.flushBuffer();
   } catch (Exception e) {
    System.out.println("Excel is not exist!");
   }
   out = pageContext.pushBody();
  }
%><%!private static WritableSheet setSheetHeader(WritableSheet sheet,WritableCellFormat writableCellFormat, List selValList) throws Exception 
 {
  int i = 0;
  int j = 1;
  Label label = new Label(i, j, "序号", writableCellFormat);
  sheet.addCell(label);
  sheet.setColumnView(i, "序号".length() * 4);
  for(int w =1; w < selValList.size(); w++)
  {
   label = new Label(w, j, ((String)selValList.get(w)).split("#")[0], writableCellFormat);
   sheet.addCell(label);
   sheet.setColumnView(w, ((String)selValList.get(w)).split("#")[0].length() * 5);
  }
  return sheet;
 }
%>