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;
    }