try 
        {
          
          //构建Workbook对象, 只读Workbook对象 
          //Method 1：创建可写入的Excel工作薄 
          jxl.write.WritableWorkbook wwb = Workbook.createWorkbook(new File(filename)); 
          //Method 2：将WritableWorkbook直接写入到输出流 
          /* 
          OutputStream os = new FileOutputStream(targetfile); 
          jxl.write.WritableWorkbook wwb = Workbook.createWorkbook(os); 
          */
          //创建Excel工作表 
          jxl.write.WritableSheet ws = wwb.createSheet("指标数据统计", 0);
          //
          jxl.write.Label labelC0 = new jxl.write.Label(0, 0, "序号");
          jxl.write.Label labelC1 = new jxl.write.Label(1, 0, "日期");
          jxl.write.Label labelC2 = new jxl.write.Label(2, 0, "会议次数");
          jxl.write.Label labelC3 = new jxl.write.Label(3, 0, "最大会议时长");
          jxl.write.Label labelC4 = new jxl.write.Label(4, 0, "集群注册人数");
          
          ws.addCell(labelC0);
          ws.addCell(labelC1);
          ws.addCell(labelC2);
          ws.addCell(labelC3);
          ws.addCell(labelC4);
          
          rs = cst.executeQuery();  
          while (rs.next())
          {
            temp_row ++;
            int hy_ct = rs.getInt("hy_ct");
            int MAXSC = rs.getInt("MAXSC");
            int JQC = rs.getInt("JQC");
            String dt = rs.getString("dt").trim();
            int maxsc_h = MAXSC / 3600;
            int maxsc_m = (MAXSC % 3600)/60;
            int maxsc_s = MAXSC % 60;
            String s_maxsc = Integer.toString(maxsc_h)+":"+Integer.toString(maxsc_m)+":"+Integer.toString(maxsc_s);
            
            jxl.write.Number labelN0 = new jxl.write.Number(0, temp_row, temp_row);
            jxl.write.Label labelN1 = new jxl.write.Label(1, temp_row, dt);
            jxl.write.Number labelN2 = new jxl.write.Number(2, temp_row, hy_ct);
            jxl.write.Label labelN3 = new jxl.write.Label(3, temp_row, s_maxsc);
            jxl.write.Number labelN4 = new jxl.write.Number(4, temp_row, JQC);
            
            ws.addCell(labelN0);
            ws.addCell(labelN1);
            ws.addCell(labelN2);
            ws.addCell(labelN3);
            ws.addCell(labelN4);
              
          }
          //写入Excel对象 
          wwb.write();
          //关闭可写入的Excel对象 
          wwb.close();
        }
        catch (Exception e) 
        { 
        e.printStackTrace(); 
        }