l创建Excel文件

最近的项目中遇到需要将List<Map<String,String>>存储到Excel文件中，为满足此需求设计实现了如下函数：

     /**
      * 将MapList转化为Excel文件
      * @param excelFile--excel文件的路径
      * @param mapList---要存储的mapList
      * @param titles----对应的列名称
      * @param enTitles---列名称map的keys数组
      * @throws Exception
      */
     public void mapListToExcel(String excelFile,List<Map<String, String>> mapList, Map<String, String> titles, String[] enTitles) throws Exception{
         FileOutputStream fos=new FileOutputStream(excelFile);
         HSSFWorkbook workbook = new HSSFWorkbook();
         HSSFCellStyle style = workbook.createCellStyle();
         List<HSSFSheet> sheets = new ArrayList<HSSFSheet>();
         /**
          * 设置其它数据风格
          */
         style.setBorderBottom(HSSFCellStyle.BORDER_THIN); // 设置单无格的边框为粗体
         style.setBottomBorderColor(HSSFColor.BLACK.index); // 设置单元格的边框颜色．
         style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
         style.setLeftBorderColor(HSSFColor.BLACK.index);
         style.setBorderRight(HSSFCellStyle.BORDER_THIN);
         style.setRightBorderColor(HSSFColor.BLACK.index);
         style.setBorderTop(HSSFCellStyle.BORDER_THIN);
         style.setTopBorderColor(HSSFColor.BLACK.index);
         style.setWrapText(true);//自动换行

         int columnNum = 0;   //列数
         int rowNum = 0;  //行数
         int sheetNum = 0; //工作簿数

         if(mapList == null || mapList.size() == 0)
         {
             sheets.add(createSheet(workbook,titles,style,"sheet" + sheetNum,enTitles));
             return ;
         }

         Iterator<Map<String, String>> iter = mapList.iterator();

         while(iter.hasNext())
         {
             Map<String, String> obj = iter.next();
             if(rowNum == 0)
             {
                 sheets.add(createSheet(workbook,titles,style,"sheet" + sheetNum,enTitles));
                 sheetNum++;
             }
             rowNum++;
             columnNum = 0;
             HSSFRow dataRow = sheets.get(sheetNum-1).createRow(rowNum);

             for(String title: enTitles){
                 HSSFCell cell = dataRow.createCell(columnNum);
                 String value = obj.get(title);
                 cell.setCellValue(value);
                 cell.setCellStyle(style);
                 columnNum++;
             }

             if(rowNum > 65534)
             {
                 rowNum = 0;
             }
         }

         workbook.write(fos);
         fos.close();

     }

 /**
    创建Excel工作簿
 */
     private  HSSFSheet createSheet(HSSFWorkbook workbook,Map<String, String> titles,HSSFCellStyle style,String sheetname, String[] enTitles)
     {
         HSSFSheet sheet = workbook.createSheet(sheetname);
         sheet.autoSizeColumn(1, true); //列自适应宽度
         int columnNum = 0;
         int rowNum = 0;
         HSSFRow titleRow = sheet.createRow(rowNum);

         for(String key: enTitles){
             HSSFCell cell = titleRow.createCell(columnNum);
             String title = titles.get(key);
             cell.setCellValue(title);
             cell.setCellStyle(style);
             columnNum++;
         }
         return sheet;
     }