用java制作excel格式报表

try{         getDBConnection();         pstmt = conn.prepareStatement(strSql);         ret = pstmt.executeQuery();         File tempFile=new File(filename);         try{         WritableWorkbook workbook = Workbook.createWorkbook(tempFile);         WritableSheet sheet = workbook.createSheet("sheet1", 0);         Label l=null;         jxl.write.Number n=null;         jxl.write.DateTime d=null;         WritableFont headerFont = new WritableFont(WritableFont.ARIAL,12,WritableFont.BOLD,false, UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.BLUE);         WritableCellFormat headerFormat = new WritableCellFormat (headerFont);

         WritableFont titleFont = new WritableFont(WritableFont.ARIAL,10,WritableFont.NO_BOLD,false, UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.RED);         WritableCellFormat titleFormat = new WritableCellFormat (titleFont);

         WritableFont detFont = new WritableFont(WritableFont.ARIAL,10,WritableFont.NO_BOLD,false, UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.BLACK);         WritableCellFormat detFormat = new WritableCellFormat (detFont);

         NumberFormat nf=new NumberFormat("0.00000");         WritableCellFormat priceFormat = new WritableCellFormat (detFont, nf);

         DateFormat df=new DateFormat("yyyy-MM-dd");         WritableCellFormat dateFormat = new WritableCellFormat (detFont, df);

         l=new Label(2,0,"",headerFormat);         sheet.addCell(l);         int intTitle = title.length;         for (int i=0;i<intTitle;i++)         {           l=new Label(i,2,title[i], titleFormat);           sheet.addCell(l);         }        int k = 0;        while(ret.next())                {                  k++;                  for (int j=1;j<intTitle;j++)                        {              l=new Label(j-1,k+3,ret.getString(j),detFormat);              sheet.addCell(l);                          //sheet.setColumnView(j,30);                        }                }         workbook.write();         workbook.close();         } catch(Exception e){}    }   catch(SQLException ae) {        throw new ApplicationException("创建Excel时查询数据库操作失败! " +             "错误信息:" +strSql + ",异常信息为 :\n" + ae.getMessage());     } finally {                closeResultSet(ret);                closeStatement(pstmt);                closeConnection();                   }}