六、Delphi10.3通过Json.Serializers单元对大量数据序列化

  TPeople = class
  private
    FName: string;
    FScore: Integer;
    FAge: TDateTime;
  public
    property Name: string read FName write FName;
    property Score: Integer read FScore write FScore;
    property Age: TDateTime read FAge write FAge;
  end;

uses
  REST.Json,
  System.Json,
  System.Types,
  System.Json.Types,
  System.Json.Writers,
  System.Json.Builders,
  System.Json.Serializers(*必须引用这个单元*);

procedure TForm1.Button6Click(Sender: TObject);
var
  m_People: TPeople;
  m_Time1, m_Time2: TDateTime;
  m_PeopleList: TArray<TPeople>;
  I: Integer;
begin
  Memo1.Clear;
  Memo2.Clear;
  m_Time1 := Now;
  SetLength(m_PeopleList, 1000001);
  for I := 0 to 1000000 do
  begin
    m_PeopleList[I] := TPeople.Create;
    try
      // 循环赋值
      m_PeopleList[I].Name := ‘张三‘;
      m_PeopleList[I].Age := Now;
      m_PeopleList[I].Score := I;
    finally
    end;
  end;
  TJsonSerializer.Create.Serialize(m_PeopleList);
  m_Time2 := Now;
  //看看100万个实例类生产JSON需要多久
  Memo1.Lines.Add(FormatDateTime(‘ss.zzz‘, m_Time2 - m_Time1));
  //把JSON显示出来
  Memo2.Text := TJsonSerializer.Create.Serialize(m_PeopleList);
end;