工具类Excel导出那些事儿

Posted 2022-11-28 Summer-Zheng

      导出Excel又有了新的需求，之前都是直接导出list<T>，现需要导出List<map>，并且需要动态创建表头。如下：

【工具类】

引用jxl包

 

public class ListMapExportExcelUtil 

    /**
     * 写excel.
     *
     * @param fileName         文件名
     * @param sheetName        sheet名
     * @param mapKeyListString map的key，表头们
     * @param dataListMap      数据
     */
    public static void writeExcel(HttpServletResponse response,String fileName,
                           String sheetName,
                               List<String> mapKeyListString, List<Map<String, Object>> dataListMap) throws EngineException 
        WritableWorkbook wwb = null;
        OutputStream os = null;
        try 
            os = response.getOutputStream();
            wwb = Workbook.createWorkbook(os);
            WritableSheet ws = wwb.createSheet(sheetName, 0);

            int size = mapKeyListString.size();
            insertHead(ws, mapKeyListString);

            int rownum = 1;
            if ((dataListMap != null) && (dataListMap.size() > 0)) 
                for (int i = 0; i < dataListMap.size(); i++) 
                    LogUtil.getAppLogger().info("当前行数为：",i);
                    Map map = (Map) dataListMap.get(i);
                    for (int j = 0; j < mapKeyListString.size(); j++) 
                        if(map.get(mapKeyListString.get(j)) != null )
                            insertCell(ws, null, rownum, j, map.get(mapKeyListString.get(j)).toString());
                        else
                            insertCell(ws, null, rownum, j, " ");
                        
                    

                    rownum++;
                

            

            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            response.setContentType("application/msexcel");
            response.addHeader("Content-disposition", "attachment;" +
                    "filename=" + fileName + "_" + sdf.format(new Date()
            ) + ".xls");
            wwb.write();
         catch (Exception e) 
            throw new Exception(e);
         finally 
            try 
                if (wwb != null)
                    wwb.close();
                if (os != null)
                    os.close();
             catch (Exception e) 
                throw new Exception(e);
            
        
    

    //单元格
    private static void insertCell(WritableSheet writableSheet, WritableCellFormat writableCellFormat, int row, int column, String name) throws RowsExceededException, WriteException 
        WritableCell cell = new Label(column, row, name);
        if (writableCellFormat != null) 
            cell.setCellFormat(writableCellFormat);
        
        writableSheet.addCell(cell);
    

    //表头
    private static void insertHead(WritableSheet writableSheet, List<String> titleColumn) throws RowsExceededException, WriteException, EngineException 
        WritableFont writableFont = new WritableFont(WritableFont.TIMES, 12, WritableFont.BOLD);
        WritableCellFormat writableCellFormat = new WritableCellFormat(writableFont);

        try 
            writableCellFormat.setAlignment(Alignment.CENTRE);
         catch (WriteException e) 
            throw new EngineException(CodeEnum.PARAM_FORMAT_ERROR.getCode(),CodeEnum.PARAM_FORMAT_ERROR.getMessage(),e);
        
        for (int i = 0; i < titleColumn.size(); i++) 
            WritableCell cell = new Label(i, 0, titleColumn.get(i));
            cell.setCellFormat(writableCellFormat);
            writableSheet.addCell(cell);