IDHTTP的基本用法

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mb5ff5917b5bbc5 2016-09-25 20:10:00

文章标签 .net 代理服务器服务端 get方法 文章分类 .Net 后端开发

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173	`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``;`