unit Unit1;

interface

uses

  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,

  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, IdTCPConnection, IdTCPClient, IdHTTP,

  IdBaseComponent, IdComponent, IdIOHandler, IdIOHandlerSocket,

  IdIOHandlerStack, IdSSL, IdSSLOpenSSL, Vcl.StdCtrls;

type

  TForm1 = class(TForm)

    IdSSLIOHandlerSocketOpenSSL1: TIdSSLIOHandlerSocketOpenSSL;

    btnPost: TButton;

    IdHTTP1: TIdHTTP;

    procedure FormCreate(Sender: TObject);

    procedure btnPostClick(Sender: TObject);

  private

    { Private declarations }

  public

    { Public declarations }

  end;

var

  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.btnPostClick(Sender: TObject);

var

  postStream: TStringStream;

  AEnctryRespose: string;

  url: string;

  aEnctryPost: string;

begin

  url := 'https:/xxx.xx';

  aEnctryPost := '{"username":"test","password":"1"}';

  postStream := TStringStream.Create(aEnctryPost);

  try

    postStream.Position := 0;

    AEnctryRespose := IdHTTP1.Post(url, postStream);

    ShowMessage(AEnctryRespose);//post后的返回内容

  finally

    IdHTTP1.Disconnect;

    FreeAndNil(postStream);

  end;

end;

procedure TForm1.FormCreate(Sender: TObject);

begin

  IdHTTP1 := TIdHTTP.Create(nil);

  IdSSLIOHandlerSocketOpenSSL1 := TIdSSLIOHandlerSocketOpenSSL.Create(nil);

  IdHTTP1.IOHandler := IdSSLIOHandlerSocketOpenSSL1;

  IdHTTP1.HandleRedirects := True;

  IdHTTP1.Request.ContentType := 'application/json';//设置交互方式为json格式

end;