TNetHttpClient的用法
<p>TNetHttpClient的用法</p><p>TNetHttpClient是DELPHI XE8新增加的控件。</p>
<p>在之前，我们一般都是使用IDHTTP控件，但在安卓、IOS等非WINDOWS平台，IDHTTP访问HTTPS却不行了。</p>
<p>大家知道INDY的SSL访问局限于WINDOWS平台，并不支持跨平台HTTPS访问。</p>
<p>鉴于以上原因，所以EMB才推出了TNetHttpClient。</p>
<p>TNetHttpClient既可以阻塞（如同INDY），又可以异步（这就很全面了）。</p>
<p>TNetHttpClient不再和INDY一样依赖OPENSSL。</p>
<div class="cnblogs_Highlighter">
<pre class="brush:csharp;gutter:true;">unit Unit1;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants,
System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, System.Net.URLClient,
System.Net.HttpClient, System.Net.HttpClientComponent, Vcl.StdCtrls;
type
TForm1 = class(TForm)
NetHTTPClient1: TNetHTTPClient;
Button1: TButton;
Memo1: TMemo;
Button2: TButton;
NetHTTPClient2: TNetHTTPClient;
Button3: TButton;
procedure Button1Click(Sender: TObject);
procedure NetHTTPClient1RequestCompleted(const Sender: TObject;
const AResponse: IHTTPResponse);
procedure Button2Click(Sender: TObject);
procedure NetHTTPClient2RequestCompleted(const Sender: TObject;
const AResponse: IHTTPResponse);
procedure Button3Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
uses System.NetEncoding;
{$R *.dfm}
function UrlDecode(const AStr: AnsiString): AnsiString;
var
Sp, Rp, Cp: PAnsiChar;
s: AnsiString;
begin
SetLength(Result, Length(AStr));
Sp := PAnsiChar(AStr);
Rp := PAnsiChar(Result);
Cp := Sp;
while Sp^ <> #0 do
begin
case Sp^ of
'+':
Rp^ := ' ';
'%':
begin
Inc(Sp);
if Sp^ = '%' then
Rp^ := '%'
else
begin
Cp := Sp;
Inc(Sp);
if (Cp^ <> #0) and (Sp^ <> #0) then
begin
s := AnsiChar('$') + Cp^ + Sp^;
Rp^ := AnsiChar(StrToInt(string(s)));
end;
end;
Cp := Cp;
end;
else
Rp^ := Sp^;
end;
Inc(Rp);
Inc(Sp);
end;
SetLength(Result, Rp - PAnsiChar(Result));
end;
procedure TForm1.Button1Click(Sender: TObject);
var
vHttp: TNetHTTPClient;
vUTF8, vGBK: TStringStream;
begin
vHttp := TNetHTTPClient.Create(nil);
vUTF8 := TStringStream.Create('', TEncoding.GetEncoding(65001));
vGBK := TStringStream.Create('', TEncoding.GetEncoding(936));
try
Memo1.Lines.Add('----------------阻塞----------------');
with vHttp do
begin
vUTF8.Clear;
ConnectionTimeout := 2000; // 2秒
ResponseTimeout := 10000; // 10秒
AcceptCharSet := 'utf-8';
AcceptEncoding := '65001';
AcceptLanguage := 'zh-CN';
ContentType := 'text/html';
UserAgent := 'Embarcadero URI Client/1.0';
try
Get('http://offeu.com/utf8.txt', vUTF8);
Memo1.Lines.Add('utf8:' + TNetEncoding.URL.UrlDecode(vUTF8.DataString));
except
on E: Exception do
// Error sending data: (12002) 操作超时.
// Error receiving data: (12002) 操作超时
if Copy(E.Message, 1, Pos(':', E.Message) - 1) = 'Error sending data'
then
Memo1.Lines.Add('utf8:连接失败！')
else if Copy(E.Message, 1, Pos(':', E.Message) - 1) = 'Error receiving data'
then
Memo1.Lines.Add('utf8:接收失败，请延长接收超时时间！')
else
Memo1.Lines.Add('utf8:' + E.Message);
end;
vGBK.Clear;
AcceptCharSet := 'gbk';
AcceptEncoding := '936';
AcceptLanguage := 'zh-CN';
ContentType := 'text/html';
UserAgent := 'Embarcadero URI Client/1.0';
Get('http://offeu.com/gbk.txt', vGBK);
Memo1.Lines.Add('gbk:' + string(UrlDecode(AnsiString(vGBK.DataString))));
end;
Memo1.Lines.Add('----------------异步----------------');
with NetHTTPClient1 do
begin
Asynchronous := true;
ConnectionTimeout := 10000; // 10秒
ResponseTimeout := 10000; // 10秒
AcceptCharSet := 'utf-8';
AcceptEncoding := '65001';
AcceptLanguage := 'zh-CN';
ContentType := 'text/html';
UserAgent := 'Embarcadero URI Client/1.0';
Get('http://offeu.com/utf8.txt');
end;
finally
vUTF8.Free;
vGBK.Free;
vHttp.Free;
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
var
vHttp: TNetHTTPClient;
vS: TStringStream;
begin
// 这里用的 APPCODE 是阿里云市场中的api，需要申请。
vHttp := TNetHTTPClient.Create(nil);
vS := TStringStream.Create('', TEncoding.GetEncoding(65001));
try
with vHttp do
begin
Memo1.Lines.Add('--------------SSL阻塞--------------');
vS.Clear;
ConnectionTimeout := 10000; // 10秒
ResponseTimeout := 10000; // 10秒
CustomHeaders['Authorization'] :=
'APPCODE 你申请的appcode';
Accept := 'application/json;';
ContentType := 'application/json; charset=utf-8;';
UserAgent := 'Embarcadero URI Client/1.0';
Get('https://dm-81.data.aliyun.com/rest/160601/ip/getIpInfo.json?'
+ 'ip=60.191.244.5', vS);
Memo1.Lines.Add('ssl:'
+ string(TNetEncoding.URL.UrlDecode(vS.DataString)));
end;
finally
vS.Free;
vHttp.Free;
end;
Memo1.Lines.Add('--------------SSL异步--------------');
with NetHTTPClient2 do
begin
Asynchronous := true;
ConnectionTimeout := 10000; // 10秒
ResponseTimeout := 10000; // 10秒
CustomHeaders['Authorization'] :=
'APPCODE 你申请的appcode';
Accept := 'application/json;';
ContentType := 'application/json; charset=utf-8;';
UserAgent := 'Embarcadero URI Client/1.0';
Get('https://dm-81.data.aliyun.com/rest/160601/ip/getIpInfo.json?'
+ 'ip=60.191.244.5');
end;
end;
procedure TForm1.Button3Click(Sender: TObject);
var
vHttp: TNetHTTPClient;
vS: TStringStream;
vList: TStrings;
begin
vHttp := TNetHTTPClient.Create(nil);
vList := TStringList.Create;
vS := TStringStream.Create;
try
Memo1.Lines.Add('----------------Post阻塞----------------');
vS.Clear;
with vHttp do
begin
ConnectionTimeout := 2000; // 2秒
ResponseTimeout := 10000; // 10秒
AcceptCharSet := 'utf-8';
AcceptEncoding := '65001';
AcceptLanguage := 'zh-CN';
ContentType := 'text/html';
UserAgent := 'Embarcadero URI Client/1.0';
vList.Clear;
vList.Values['id'] := 'test';
vList.Values['pwd'] := 'test';
vList.Values['cmd'] := '1';
try
Post('http://60.191.220.219:8090', vList, vS); // utf8进gbk出
// Memo1.Lines.Add('post:' + TNetEncoding.URL.UrlDecode(vS.DataString));
Memo1.Lines.Add('post:' + vS.DataString);
except
on E: Exception do
// Error sending data: (12002) 操作超时.
// Error receiving data: (12002) 操作超时
if Copy(E.Message, 1, Pos(':', E.Message) - 1) = 'Error sending data'
then
Memo1.Lines.Add('post:连接失败！')
else if Copy(E.Message, 1, Pos(':', E.Message) - 1) = 'Error receiving data'
then
Memo1.Lines.Add('post:接收失败，请延长接收超时时间！')
else
Memo1.Lines.Add('post:' + E.Message);
end;
end;
finally
vS.Free;
vList.Free;
vHttp.Free;
end;
end;
procedure TForm1.NetHTTPClient1RequestCompleted(const Sender: TObject;
const AResponse: IHTTPResponse);
begin
Memo1.Lines.Add('utf8:' + TNetEncoding.URL.UrlDecode(
AResponse.ContentAsString(TEncoding.GetEncoding(65001))));
end;
procedure TForm1.NetHTTPClient2RequestCompleted(const Sender: TObject;
const AResponse: IHTTPResponse);
begin
Memo1.Lines.Add('ssl:' + TNetEncoding.URL.UrlDecode(
AResponse.ContentAsString(TEncoding.GetEncoding(65001))));
end;
end.
</pre>
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<p> </p>
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<p>本文来自博客园，作者：{咏南中间件}，转载请注明原文链接：https://www.cnblogs.com/hnxxcxg/p/10892054.html</p><br><br>
来源：https://www.cnblogs.com/hnxxcxg/p/10892054.html
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