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鸿蒙开发（NEXT/API 12）【上传下载文件】远场通信场景

news 2025/8/21 14:56:46

场景介绍

本协议栈框架支持将文件上传到服务器或者从服务器下载文件。

开发步骤

导包。

import { rcp } from '@kit.RemoteCommunicationKit';
import {fileIo} from '@kit.CoreFileKit';

下载文件。

let SESSION_CONFIG: rcp.SessionConfiguration = {// 此处请根据业务设置合适的Configuration
}
let DOWNLOAD_TO_PATH = ""; // 请根据自身业务选择合适的路径
// 1、下载到文件
const session = rcp.createSession(SESSION_CONFIG);
const respMemory = await session.get("https//www.example.com");
const dataMemory = respMemory.toString();
if (fileIo.accessSync(DOWNLOAD_TO_PATH)) {fileIo.unlinkSync(DOWNLOAD_TO_PATH);
}
const resp = await session.downloadToFile("https//www.example.com", {kind: 'file',file: DOWNLOAD_TO_PATH
});
session.close();
// 2、下载到目录
const session = rcp.createSession(SESSION_CONFIG);
const respMemory = await session.get("https//www.example.com");
const dataMemory = respMemory.toString();
const downloadedPath = "FILES_DIR" + "DOWNLOAD_FOLDER_SUB_PATH"; // 请根据自身业务选择合适的路径
if (fileIo.accessSync(downloadedPath)) {fileIo.unlinkSync(downloadedPath);
}
const resp = await session.downloadToFile("https//www.example.com", {kind: 'folder',path: "FILES_DIR" // 请根据自身业务选择合适的路径
});
session.close();
// 3、下载到文件描述符
const session = rcp.createSession(SESSION_CONFIG);
const respMemory = await session.get("https//www.example.com");
const dataMemory = respMemory.toString();
if (fileIo.accessSync(DOWNLOAD_TO_PATH)) {fileIo.unlinkSync(DOWNLOAD_TO_PATH);
}
const file = fileIo.openSync(DOWNLOAD_TO_PATH, fileIo.OpenMode.CREATE | fileIo.OpenMode.WRITE_ONLY);
const resp = await session.downloadToFile("https//www.example.com", {kind: 'file',file: file.fd
});
fileIo.closeSync(file.fd);
session.close();
// 4、下载到文件对象
const session = rcp.createSession(SESSION_CONFIG);
const respMemory = await session.get("https//www.example.com");
const dataMemory = respMemory.toString();
if (fileIo.accessSync(DOWNLOAD_TO_PATH)) {fileIo.unlinkSync(DOWNLOAD_TO_PATH);
}
const file = fileIo.openSync(DOWNLOAD_TO_PATH, fileIo.OpenMode.CREATE | fileIo.OpenMode.WRITE_ONLY);
const resp = await session.downloadToFile("https//www.example.com", {kind: 'file',file: file
});
fileIo.closeSync(file.fd);
session.close();

将文件上传到指定路径。

let SESSION_CONFIG: rcp.SessionConfiguration = {// 此处请根据业务设置合适的Configuration
}
// 1、传入一个文件路径
const session = rcp.createSession(SESSION_CONFIG);
const resp = await session.uploadFromFile("https://www.example.com", new rcp.UploadFromFile("UPLOAD_FILE")); // 请根据自身业务填写
const json = resp.toJSON();
session.close();
// 2、传入一个文件描述符
const session = rcp.createSession(SESSION_CONFIG);
const file = fileIo.openSync("UPLOAD_FILE", fileIo.OpenMode.READ_ONLY); // 请根据自身业务填写UPLOAD_FILE
const resp = await session.uploadFromFile("https://www.example.com", new rcp.UploadFromFile(file.fd));
const json = resp.toJSON();
fileIo.closeSync(file.fd);
session.close();
// 3、传入一个文件对象
const session = rcp.createSession(SESSION_CONFIG);
const file = fileIo.openSync("UPLOAD_FILE", fileIo.OpenMode.READ_ONLY); // 请根军自身业务定义UPLOAD_FILE
const resp = await session.uploadFromFile("https://www.example.com", new rcp.UploadFromFile(file));
const json = resp.toJSON();
fileIo.closeSync(file.fd);
session.close();
// 4、使用自定义文件对象
class FdReadFile {readonly fd: number;constructor(fd: number) {this.fd = fd;}async read(buffer: ArrayBuffer): Promise<number> {return fileIo.read(this.fd, buffer);}
}
const session = rcp.createSession(SESSION_CONFIG);
const file = fileIo.openSync("UPLOAD_FILE", fileIo.OpenMode.READ_ONLY);
const resp = await session.uploadFromFile("https://www.example.com", new rcp.UploadFromFile(new FdReadFile(file.fd)));
const json = resp.toJSON();
fileIo.closeSync(file.fd);
session.close();
// 5、使用自定义文件流
class FdReadStream {readonly file: FdReadFile;constructor(fd: number) {this.file = new FdReadFile(fd);}async read(buffer: ArrayBuffer): Promise<number> {return this.file.read(buffer);}
}
const session = rcp.createSession(SESSION_CONFIG);
const file = fileIo.openSync("UPLOAD_FILE", fileIo.OpenMode.READ_ONLY); // 请根据自身业务定义UPLOAD_FILE
const resp = await session.uploadFromFile("https://www.example.com", new rcp.UploadFromFile(new FdReadStream(file.fd)));
const json = resp.toJSON();
fileIo.closeSync(file.fd);session.close();
session.close();
// 6、使用自定义文件流
class FdSyncReadStream {readonly file: FdReadFile;constructor(fd: number) {this.file = new FdReadFile(fd);}async read(buffer: ArrayBuffer): Promise<number> {return this.file.read(buffer);}
}
const session = rcp.createSession(SESSION_CONFIG);
const file = fileIo.openSync("UPLOAD_FILE", fileIo.OpenMode.READ_ONLY);
const resp = await session.uploadFromStream("https:www.example.com", new rcp.UploadFromStream(new FdSyncReadStream(file.fd)));
const json = resp.toJSON();
fileIo.closeSync(file.fd);

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在这里插入图片描述