窗体上拖放ADOQuery1,DataSetProvider1,DataSource1,ClientDataSet1,OpenDialog1,

ExcelApplication1,ExcelWorkbook1,ExcelWorksheet1控件。

Function TForm1.ADOOpenExls:Boolean;
var
  connstr,FirstSheetName: String;
begin
  // ADO读取EXCEL文件方法.
  Result := False;

DataSetProvider1.DataSet := ADOQuery1;

DataSource1.DataSet := ClientDataSet1;

try

OpenDialog1.Filter := 'Excel文档(*.xlsx)|*.xlsx|Excel文档(*.xls)|*.xls';
  OpenDialog1.InitialDir := 'C:\';
  OpenDialog1.Title := '选择导入Excel文件' ;
  OpenDialog1.DefaultExt := 'xlsx';
  if OpenDialog1.Execute then
  begin
    ExcelApplication1.Connect;
    ExcelApplication1.Caption := 'App Import Excel';
    ExcelApplication1.Workbooks.Open(OpenDialog1.FileName,False,
        False,EmptyParam,EmptyParam,EmptyParam,True,EmptyParam,EmptyParam,
        EmptyParam,EmptyParam,EmptyParam,EmptyParam,EmptyParam,EmptyParam,0);
    ExcelWorkbook1.ConnectTo(ExcelApplication1.Workbooks[1]);
    ExcelWorksheet1.ConnectTo(ExcelWorkbook1.Sheets[1] as _WorkSheet);
    //EXCEL文件的第一个SHEET表单名称.
    FirstSheetName := ExcelWorksheet1.Name;
    //关闭Excel文件.
    ExcelWorkbook1.Close;
    ExcelApplication1.Quit;
    ExcelApplication1.Disconnect;
    with ADOQuery1 do
    begin
      Close;
      connstr := 'Provider=Microsoft.ACE.OLEDB.12.0;Extended Properties=Excel 12.0;'
        +'Data Source=%s;Persist Security Info=False;';
      connstr := Format(connstr, [OpenDialog1.FileName]);
      ConnectionString := connstr;
      SQL.Clear;
      //Sheet名称后缀必须添加$.
      SQL.Add(Format('SELECT * FROM [%s$]',[FirstSheetName]));
      Open;

ClientDataSet1.Close;
      ClientDataSet1.Fields.Clear;
      ClientDataSet1.Data := DataSetProvider1.Data;
      Close;

{

cxGrid1DBTableView1.DataController.DataSource :=  DataSource1;

cxGrid1DBTableView1.ClearItems;  //在GRID中展示数据.

cxGrid1DBTableView1.DataController.CreateAllItems(True);
      cxGrid1DBTableView1.ApplyBestFit();

}
      Result := True;
    end;
  end;
  except
    ON E :Exception do
    begin
      ADOQuery1.Close;
      ExcelApplication1.Quit;
      ExcelApplication1.Disconnect;
      ShowMessage(E.Message);
    end;
  end;
end;