grails导出excel

 /**
     * 构建excel
     * @param block 闭包，封装构建逻辑
     */
    def build(dataList,titleList,out,Closure block){

        def wb = new HSSFWorkbook();
        def sheet = wb.createSheet("new sheet");
        def row
        def cell
        def style = wb.createCellStyle()
        def font   =   wb.createFont()
        font.setFontHeightInPoints((short)12)
        font.setFontName("宋体")
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD)
        style.setFont(font)
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER)
        style.setFillBackgroundColor(HSSFColor.ORANGE.index)
        row = sheet.createRow((short) 0);

        titleList.eachWithIndex{title, i ->
            cell = row.createCell((short) (i));
            cell.setCellStyle(style)
            cell.setCellValue(title);
        }
        
        //生成逻辑
        block.call(sheet,row)

        titleList.size().times{ i ->
            sheet.autoSizeColumn((short)i)
        }
        wb.write(out);
        out.close()
    }

 /**
     * 生成excel
     * @param dataList 数据列表，其中的元素是放入每行cell的数据
     * @param titleList 标题列表
     * @param out　
     */
    def genForList(List<List> dataList,List titleList,out){
        def block = { sheet,row ->
            dataList.eachWithIndex{ dataRow,i ->
                row = sheet.createRow((short) (i+1));
                dataRow.eachWithIndex{ data,j ->
                    row.createCell((short) (j)).setCellValue(data.toString())
                }
            }
        }
        build(dataList,titleList,out,block)
    }

    /**
     * 生成excel
     * @param dataList 数据列表，其中的元素是放入每行cell的数据
     * @param titleList 标题列表
     * @param out　OutputStream
     */
    def genForMap(List<Map> dataList,List titleList,out){
        def block = { sheet,row ->
            dataList.eachWithIndex{ dataRow,i ->
                row = sheet.createRow((short) (i+1));
                dataRow.eachWithIndex{ k,v,j ->
                    row.createCell((short) (j)).setCellValue(v.toString())
                }
            }
        }
        build(dataList,titleList,out,block)
    }