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在 Delphi 中，我们通常使用 IdHTTP 或 TNetHTTPClient 等组件来处理 HTTP 请求
原文章链接：
掌握分片上传：优化大文件传输的关键策略 【C++】【WinHttp】【curl】-CSDN博客
改造思路：
- 文件分块处理：使用
TFileStream来读取和分割文件。 - HTTP 请求处理：使用
TNetHTTPClient来发送 HTTP 请求。 - 多线程上传：使用 Delphi 的
TThread类来实现多线程上传。
代码：
usesSystem.SysUtils, System.Classes, System.Net.URLClient, System.Net.HttpClient,System.Net.HttpClientComponent, System.Threading;constCHUNK_SIZE = 10 * 1024 * 1024; // 10 MBUPLOAD_URL = 'https://www.example.com/upload';MAX_THREADS = 4;typeTFileChunker = classpublicclass function SplitFileIntoChunks(const FilePath: string): TArray<TBytes>;end;TChunkUploader = classpublicclass procedure UploadChunk(const ChunkData: TBytes; ChunkNumber: Integer);end;class function TFileChunker.SplitFileIntoChunks(const FilePath: string): TArray<TBytes>;
varFileStream: TFileStream;RemainingSize, CurrentChunkSize: Int64;Buffer: TBytes;
beginFileStream := TFileStream.Create(FilePath, fmOpenRead or fmShareDenyWrite);trySetLength(Result, 0);RemainingSize := FileStream.Size;while RemainingSize > 0 dobeginCurrentChunkSize := Min(CHUNK_SIZE, RemainingSize);SetLength(Buffer, CurrentChunkSize);FileStream.ReadBuffer(Buffer[0], CurrentChunkSize);SetLength(Result, Length(Result) + 1);Result[High(Result)] := Buffer;RemainingSize := RemainingSize - CurrentChunkSize;end;finallyFileStream.Free;end;
end;class procedure TChunkUploader.UploadChunk(const ChunkData: TBytes; ChunkNumber: Integer);
varHttpClient: TNetHTTPClient;Response: IHTTPResponse;
beginHttpClient := TNetHTTPClient.Create(nil);try// 设置请求头部等HttpClient.ContentType := 'application/octet-stream';Response := HttpClient.Post(UPLOAD_URL, TStreamAdapter.Create(TBytesStream.Create(ChunkData), soOwned));// 检查响应等finallyHttpClient.Free;end;
end;procedure StartUpload(const Chunks: TArray<TBytes>);
varTaskArray: array of ITask;I: Integer;
beginSetLength(TaskArray, Length(Chunks));for I := 0 to High(Chunks) dobeginTaskArray[I] := TTask.Create(procedurebeginTChunkUploader.UploadChunk(Chunks[I], I);end);TaskArray[I].Start;end;// 等待所有任务完成TTask.WaitForAll(TaskArray);
end;varChunks: TArray<TBytes>;
begintryChunks := TFileChunker.SplitFileIntoChunks('path/to/your/largefile');StartUpload(Chunks);excepton E: Exception doWriteln(E.ClassName, ': ', E.Message);end;
end.