导出Excel的工具类，对BillListPanel进行导出

package nc.ui.fh.des.excel;

import java.io.*;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.Vector;
import java.util.Map.Entry;

import javax.swing.JFileChooser;
import javax.swing.JTable;

import nc.ui.pub.ToftPanel;
import nc.ui.pub.beans.UITable;
import nc.ui.pub.bill.BillItem;
import nc.ui.pub.bill.BillListPanel;
import jxl.*;
import jxl.write.*;
import jxl.write.biff.RowsExceededException;

/**
 * 导出Excel的工具类
 * @author 麻杰<br>
 * @创建时间：2011-11-16 下午06:08:23
 */
public class BillListExportExcel {
 
    protected static javax.swing.JFileChooser m_chooser = null;
    protected static BillListPanel billListPanel = null;
   
    /**
     * @author 麻杰<br>
     * 日期：2011-11-17
     * @param tp        父组件
     * @param sheetName  Excel页签名称
     * @param BillListPanel bill
     * @param istotal 是否合计
     */
    public static void  exportExcel(ToftPanel tp ,String sheetName,BillListPanel bill,boolean istotal){
     billListPanel = bill;
     String filePath = null;

   if (getChooser().showSaveDialog(tp) == javax.swing.JFileChooser.CANCEL_OPTION) {
    return;
   }
   filePath = getChooser().getSelectedFile().toString();
   if (filePath == null) {
    tp.showHintMessage("请输入文件名保存!");
    return;
   }

   if (filePath.indexOf(".xls") < 0) {
    filePath = filePath + ".xls";
   }
   boolean isSucceed = writeJxlByTableModel(filePath,sheetName,istotal);
   if(isSucceed){
    tp.showWarningMessage("导出完成");
   }else{
    tp.showWarningMessage("导出失败");
   }
    }

    /**
     * 生成Excel文件
     * @author 麻杰<br>
     * 日期：2011-11-17
     * @param filePatch
     * @param sheetName
     * @param istotal  是否合计
     * @return
     */
        public static boolean writeJxlByTableModel(String filePath,String sheetName,boolean istotal) {
         UITable table = billListPanel.getHeadTable();
             if (table == null || table.getRowCount() <= 0)
                  return false;
             WritableWorkbook writableWorkbook = null;
             OutputStream os = null;
          try {
                  os = new FileOutputStream(filePath);
                  // 创建可写簿
                  writableWorkbook = Workbook.createWorkbook(os);
                  // 创建工作表
                  WritableSheet ws = writableWorkbook.createSheet(sheetName, 0);
                  // 创建一个内容 第一个整数为 列，第二个整数位 行
                  Label label = null;
                  int rows = table.getRowCount();
                  int cols = table.getColumnCount();
                  for (int row = 0; row < rows + 1; row++) {
       for (int col = 0; col < cols ; col++) {
        if(row == 0){
         String headerName = table.getTableHeader().getColumnModel().getColumn(col).getHeaderValue() == null ? "" :
             table.getTableHeader().getColumnModel().getColumn(col).getHeaderValue().toString();
         label = new Label(col,row,headerName,getHeaderFormat());
         ws.addCell(label);
         ws.setColumnView(col, headerName == null ? 10 : (headerName.length() > 2 ? headerName.length()*3 : headerName.length()*6));
        }
       
        label = new Label(col,row+1,table.getValueAt(row, col) == null ? "" : table.getValueAt(row, col).toString());
        if(label.getContents() != null){
         if(label.getContents().equals("false")){
          label.setString("N");
         }else if(label.getContents().equals("true")){
          label.setString("Y");
         }
        }
        ws.addCell(label);
       }
                  }
                  if(istotal){
                   //添加合计行
                   Map<Integer,String> map = getTotalMap();
                   if(map != null && map.size()>0){
                    Set<Entry<Integer,String>> set =  map.entrySet();
                    Iterator it = set.iterator();
                    while(it.hasNext()){
                     Entry<Integer,String> entry = (Entry<Integer, String>) it.next();
                     label = new Label(entry.getKey(),rows+1,entry.getValue());
                     ws.addCell(label);
                    }
                   }
                  }
                  writableWorkbook.write();
                 
          } catch (IOException e) {
                  e.printStackTrace();
          } catch (RowsExceededException e) {
                  e.printStackTrace();
          } catch (WriteException e) {
                  e.printStackTrace();
          } finally {
                  if(writableWorkbook != null){
                   try {
      writableWorkbook.close();
     } catch (WriteException e) {
      e.printStackTrace();
     } catch (IOException e) {
      e.printStackTrace();
     }
                  }
                  if(os != null){
                   try {
      os.close();
     } catch (IOException e) {
      e.printStackTrace();
     }
                  }
          }
          return true;
        }
       
        /**
         * 获得文件选择器
         * @author 麻杰<br>
         * 日期：2011-11-17
         * @return
         */
     private static javax.swing.JFileChooser getChooser() {

      if (m_chooser == null) {
       m_chooser = new JFileChooser();
       m_chooser.setDialogType(JFileChooser.SAVE_DIALOG);
      }
      return m_chooser;

     }
     
     /**
      * 获得表头行样式
      * @author 麻杰<br>
      * 日期：2011-11-16
      * @throws WriteException
      */
     private static WritableCellFormat getHeaderFormat() throws WriteException{
      WritableFont font = new WritableFont(WritableFont.ARIAL, 10, WritableFont.BOLD, false);
      WritableCellFormat format = new WritableCellFormat(font);
      format.setWrap(false);
      format.setAlignment(Alignment.CENTRE);//水平方向剧中
      format.setVerticalAlignment(VerticalAlignment.CENTRE);
      return format;
     }
     
     /**
      * 获得合计封装Map
      * @author 麻杰<br>
      * 日期：2011-11-18
      * @return
      */
     private static Map<Integer,String> getTotalMap(){
      Vector vector = (Vector)billListPanel.getHeadBillModel().getTotalTableModel().getDataVector().get(0);
      Object total = null;
      Map<Integer,String> map = new HashMap<Integer,String>();
      for(int i=0;i<vector.size();i++){
       total = vector.get(i);
       if(total != null){
        int result = getOrder(i);
        if(result != -1){
         map.put(result, total.toString());
        }
       }
      }
      return map;
     }
     
     /**
      * 根据合计值的位置获得其在UITable中的位置
      * @author 麻杰<br>
      * 日期：2011-11-18
      * @param num
      * @return
      */
     private static Integer getOrder(int num){
   int result = 0;
   BillItem[] billItem = billListPanel.getHeadBillModel().getBodyItems();
   
   if(!billItem[num].isShow()){
    return -1;
   }
   
   for(int i=0;i<num;i++){
    if(billItem[i].isShow()){
     result++;
    }
   }
   return result;
     }
}