IDHTTP的基本用法

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一、IDHTTP的基本用法 IDHttp和WebBrowser一样，都可以实现抓取远端网页的功能，但是http方式更快、更节约资源，缺点是需要手动维护cook，连接等 IDHttp的创建，需要引入IDHttp procedure InitHttp(); begin     http := TIdHTTP.Create(nil);     http.ReadTimeout := 30000;     http.OnRedirect := OnRedirect;     http.Request.Accept := 'image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, */*';     http.Request.AcceptLanguage := 'zh-cn';     http.Request.ContentType := 'application/x-www-form-urlencoded';     http.Request.UserAgent := 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 1.1.4322)';     http.ProxyParams.ProxyServer := '代理服务器地址';     http.ProxyParams.ProxyPort := '代理服务器端口'; end; 二、如何取得服务端返回的cookie信息，并添加到http的request对象中 procedure Setcookie; var    i: Integer;    tmp, cookie: String; begin    cookie := '';    for i := 0 to http.Response.RawHeaders.Count - 1 do    begin        tmp := http.Response.RawHeaders[i];       if pos('set-cookie: ', LowerCase(tmp)) = 0 then Continue;     tmp := Trim(Copy(tmp, Pos('Set-cookie: ', tmp) + Length('Set-cookie: '), Length(tmp)));     tmp := Trim(Copy(tmp, 0, Pos(';', tmp) - 1));       if cookie = '' then cookie := tmp else cookie := cookie + '; ' + tmp; end; if cookie <> '' then begin     for i := 0 to http.Request.RawHeaders.Count - 1 do     begin       tmp := http.Request.RawHeaders[i];       if Pos('cookie', LowerCase(tmp)) = 0 then Continue;       http.Request.RawHeaders.Delete(i);       Break;     end;     http.Request.RawHeaders.Add('cookie: ' + cookie); end; end; 三、如何取得网页中的所有连接，对代码做修改你也可以实现查找所有图片等等 function GetURLList(Data: String): TStringList; var i: Integer; List: TStringList; tmp: String; function Split(Data, Node: String): TStringList;    var     Count, i, j: Integer;        function GetFieldCount(Data, Node: String): Integer;       var          i: Integer;       begin           Result := -1;           i := Pos(Node, Data);          if i = 0 then Exit;              Result := 0;           while i <> 0 do           begin             Inc(Result);              Delete(Data, 1, i + Length(Node) - 1);             i := Pos(Node, Data);           end;     end;    begin       Result := TStringList.Create; Count := GetFieldCount(Data, Node); for i := 0 to Count - 1 do begin      j := Pos(Node, Data);      Result.Add(Copy(Data, 1, j - 1));      Delete(Data, 1, j + Length(Node) - 1); end; Result.Add(Data); end; begin Result := TStringList.Create; try     List := split(Data, 'href=');      for i := 1 to List.Count - 1 do      begin       tmp := List[i];        tmp := Copy(tmp, 0, Pos('</a>', tmp) - 1);        tmp := Copy(tmp, 0, Pos('>', tmp) - 1);        if Pos(' ', tmp) <> 0 then           tmp := Copy(tmp, 0, Pos(' ', tmp) - 1);        tmp := Q_ReplaceStr(tmp, Char(34), '');      tmp := Q_ReplaceStr(tmp, Char(39), '');        if not Compare(CI.Key, tmp) then Continue;        if Copy(tmp, 1, 7) <> 'http://' then      begin          if Copy(tmp, 1, 1) = '.' then tmp := StringReplace(tmp, '.', '', []);        if Copy(tmp, 1, 1) = '.' then tmp := StringReplace(tmp, '.', '', []);         try          tmp := 'http://' + http.URL.Host + ':' + http.URL.Port + http.URL.Path + tmp;         except          end;        end;        if Result.IndexOf(tmp) <> -1 then Continue;           Result.Add(tmp);      end;    FreeAndNil(List); except end; end; 四、如何模拟http的get方法打开一个网页 function GetMethod(http: TIDhttp; URL: String; Max: Integer): String; var RespData: TStringStream; begin RespData := TStringStream.Create(''); try     try       Http.Get(URL, RespData);       Http.Request.Referer := URL;       Result := RespData.DataString;     except       Dec(Max);       if Max = 0 then       begin         Result := '';         Exit;       end;       Result := GetMethod(http, URL, Max);     end; finally     FreeAndNil(RespData); end; end; 五、如何模拟http的post方法提交一个网页 function PostMethod(URL, Data: String; max: Integer): String; var PostData, RespData: TStringStream; begin RespData := TStringStream.Create(''); PostData := TStringStream.Create(Data); try     try       if http = nil then Exit;       Http.Post(URL, PostData, RespData);       Result := RespData.DataString;       http.Request.Referer := URL;     except       Dec(Max);       if Max = 0 then       begin         Result := '';         Exit;       end;       Result := PostMethod(URL, Data, Max);     end; finally     http.Disconnect;     FreeAndNil(RespData);     FreeAndNil(PostData); end; end; 六、伪造session var My_Cookie,tmpcookie:string; begin aIdHttp.Get('http://www.huochepiao.net/'); tmpcookie:=aIdHttp.Request.CustomHeaders.Values['Set-Cookie'];    if Pos(';',tmpcookie)>0 then      My_Cookie:=LeftBStr(tmpcookie,Pos(';',tmpcookie)-1) else      My_Cookie:= tmpcookie; // aIdHTTP.Request.CustomHeaders.Clear; aIdHTTP.Request.CustomHeaders.Add('Cookie:'+My_COOKIE); end;