#yyds干货盘点#java导出excel文件

Posted 2022-03-01 峰啊疯了

1.export函数

//导出文件接口
    public String export()
        return this.myExport(exportList);
    

2.导出列名

private String myExport(List<BusinessDept> list)
        com.bronzesoft.power.tools.json.JSONObject info = new com.bronzesoft.power.tools.json.JSONObject();
        try
            List<String> headList = new ArrayList<String>(Arrays.asList("年", "月", "部门","部门负责人","经营值","收入", "支出","填报工时","标准工时","经营参数"));
            Commonutil.export(list,headList,"部门经营总览导出");

            info = Commonutil.setInfo(info,"部门经营总览导出");
        catch (Exception e)
            LogUtil.error(this.getClass().getName()+".exportExcel()", e);
        
        return info.toString();
    

3.export实现方法

​首先，理解一下一个Excel的文件的组织形式，一个Excel文件对应于一个workbook(XSSFWorkbook)，一个workbook可以有多个sheet（XSSFSheet）组成，一个sheet是由多个row（XSSFRow）组成，一个row是由多个cell（XSSFCell）组成。​

public static <T> boolean export(List<T> list,List<String> headList,String fileName)
    return myExport(list,headList,fileName,com.bronzesoft.rdm.platform.util.Constants.PATH + com.bronzesoft.power.platform.Constants.TEMPFOLDER_DIR );
  
  //将list导出为excel，文件名为fileName
  public static <T> boolean myExport(List<T> list,List<String> headList,String fileName,String path)
    try
      if(!checkListAndHead(list,headList))
                LogUtil.info(  "head的长度有问题,导出的文件不正确" );
      
      File file = new File(path + File.separator + fileName + ".xlsx");
      if(!file.exists()) 
        file.createNewFile();
      
      //创建对应excel文件,存储路径path待确定
      XSSFWorkbook workBook = new XSSFWorkbook();
      //创建一个excel的sheet页
      XSSFSheet sheet = workBook.createSheet(fileName);
      XSSFRow row = null;
      XSSFCell cell = null;

      Map<String, CellStyle> styles = StyleUtil.createStyles(workBook);

      //表头样式
      CellStyle headCenterIndex = styles.get("headCenter");
      //列的样式居中，背景颜色为白色
      CellStyle center = styles.get("centerWhite");
      row = sheet.createRow(0);
      //表头数据
      for (int i = 0; i < headList.size(); i++) 
        //创建列
        cell = row.createCell(i);
        //设置列的value
        cell.setCellValue(headList.get(i));
        //设置列的样式
        cell.setCellStyle(headCenterIndex);
      
      //表格数据

      //写入表格数据
      String codeName = "";
      int rownum = 1;
      T obj = null;

      for(int i = 0; i < list.size(); i++)
        obj = list.get(i);
        if(null != obj)
          Field[] fields = obj.getClass().getDeclaredFields();
          row = sheet.createRow(rownum);
          for(int j = 0; j< fields.length; j++)
            fields[j].setAccessible(true);
            codeName = String.valueOf(fields[j].get(obj));
            //创建第j列
            cell = row.createCell(j);
            cell.setCellValue(Commonutil.getStringVal(codeName));
            cell.setCellStyle(center);
          
        
        rownum++;
      
//      //i代表列，设置列的宽度
//      for (int i = 0; i < headList.size(); i++) 
//        if(i == 0)
//          sheet.setColumnWidth(i, 2000);
//        else if(i == 1 || i == 3)
//          sheet.setColumnWidth(i, 6000);
//        else
//          sheet.setColumnWidth(i, 4000);
//        
//      

      //将文件写到临时目录
      #yyds干货盘点#Hyperf结合PhpOffice/PhpSpreadsheet实现Excel&CSV文件导出导入

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