[delphi]indy idhttp post方法

idhttp中對於post方法的定義：

    function Post(AURL: string; ASource: TIdStrings): string; overload;
    function Post(AURL: string; ASource: TStream): string; overload;
    function Post(AURL: string; ASource: TIdMultiPartFormDataStream): string; overload;
    procedure Post(AURL: string; ASource: TIdMultiPartFormDataStream; AResponseContent: TStream); overload;
    procedure Post(AURL: string; ASource: TIdStrings; AResponseContent: TStream); overload;
    procedure Post(AURL: string; ASource, AResponseContent: TStream); overload;

其中的基本方法是下面的過程類方法，其他post重載方法均爲嵌套使用此方法：

procedure TIdCustomHTTP.Post(AURL: string; ASource, AResponseContent: TStream);

參數：

AURL: string 	// post請求URL
ASource: TIdMultiPartFormDataStream 	// TStream派生的類，其中爲發送的流數據及mime信息，可用於上傳文件
ASource: TStream 	// 發送的流數據
AResponseContent: TStream // 響應內容流ASource: TIdStrings // TString派生的類，用於向服務器提交數據

ASource 爲TIdStrings的數據，使用的MIME是默認的“application/x-www-form-urlencoded”，而TIdMultiFormDataStream則是根據發送的內容/文件來設定MIME類型。

示例：

unit Umain;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, IdBaseComponent, IdComponent, IdTCPConnection, IdTCPClient,
  IdHTTP, StdCtrls, IdMultipartFormData;

type
  TForm1 = class(TForm)
    IdHTTP1: TIdHTTP;
    Memo1: TMemo;
    btnOne: TButton;
    btnTwo: TButton;
    btnThree: TButton;
    btnFour: TButton;
    btnFive: TButton;
    btnSix: TButton;
    procedure btnOneClick(Sender: TObject);
    procedure btnTwoClick(Sender: TObject);
    procedure btnThreeClick(Sender: TObject);
    procedure btnFourClick(Sender: TObject);
    procedure btnFiveClick(Sender: TObject);
    procedure btnSixClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

const
  sPostUrl = 'http://cne.csu.edu.cn/reg/mima-pass.asp?path=';

procedure TForm1.btnOneClick(Sender: TObject);
var
  postcmd : TStringList;
begin
  postcmd := TStringList.Create;  // 組合參數列表
  postcmd.Add('AutoGet=1');
  postcmd.Add('Logintype=0');
  postcmd.Add('password=test');
  postcmd.Add('username=test');
  Memo1.Text := IdHTTP1.Post(sPostUrl, postcmd);  // 以post的方式發送到服務器
end;

procedure TForm1.btnTwoClick(Sender: TObject);
var
  postStream : TStringStream;
begin
  IdHTTP1.Request.ContentType := 'application/x-www-form-urlencoded'; // 定義發送mime類型
  postStream := TStringStream.Create('AutoGet=1&Logintype=0&password=test&username=test');  // 發送內容
  Memo1.Text := IdHTTP1.Post(sPostUrl, postStream);
end;

procedure TForm1.btnThreeClick(Sender: TObject);
var
  postStream : TIdMultiPartFormDataStream;
begin
  IdHTTP1.HandleRedirects := true;  // 允許重定向，因爲這個站點會發生重定向
  IdHTTP1.Request.Referer := 'http://www.qiuziti.com/'; // 設置來路，此網站要求

  postStream := TIdMultiPartFormDataStream.Create;  // 創建TIdMultiPartFormDataStream類

  postStream.AddFormField('textfield', 'd:\temp\test.png'); // 表單參數
  postStream.AddFile('uploaded_file', 'd:\temp\test.png', 'image/png'); // 表單文件
  Memo1.Text := Utf8ToAnsi(IdHTTP1.Post('http://www.qiuziti.com/s/upload.ashx', postStream));
end;

procedure TForm1.btnFourClick(Sender: TObject);
var
  postStream : TIdMultiPartFormDataStream;
  respStream : TStringStream;
begin
  IdHTTP1.HandleRedirects := true;  // 允許重定向，因爲這個站點會發生重定向
  IdHTTP1.Request.Referer := 'http://www.qiuziti.com/'; // 設置來路，此網站要求

  postStream := TIdMultiPartFormDataStream.Create;  // 創建TIdMultiPartFormDataStream類
  respStream := TStringStream.Create('');

  postStream.AddFormField('textfield', 'd:\temp\test.png'); // 表單參數
  postStream.AddFile('uploaded_file', 'd:\temp\test.png', 'image/png'); // 表單文件

  IdHTTP1.Post('http://www.qiuziti.com/s/upload.ashx', postStream, respStream);

  Memo1.Text := Utf8ToAnsi(respStream.DataString);
end;

procedure TForm1.btnFiveClick(Sender: TObject);
var
  respStream : TStringStream;
  postcmd : TStringList;
begin
  postcmd := TStringList.Create;
  respStream := TStringStream.Create('');

  postcmd.Add('AutoGet=1');
  postcmd.Add('Logintype=0');
  postcmd.Add('password=test');
  postcmd.Add('username=test');

  IdHTTP1.Post(sPostUrl, postcmd, respStream);

  Memo1.Text := respStream.DataString;
end;

procedure TForm1.btnSixClick(Sender: TObject);
var
  postStream, respStream : TStringStream;
begin
  postStream := TStringStream.Create('AutoGet=1&Logintype=0&password=test&username=test');
  respStream := TStringStream.Create('');
  IdHTTP1.Request.ContentType := 'application/x-www-form-urlencoded'; // 定義發送mime類型
  IdHTTP1.Post(sPostUrl, postStream, respStream);

  Memo1.Text := respStream.DataString;
end;

end.

Demo下載：

http://download.csdn.net/detail/none01/5130108