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文件下载

    本SDK提供GetObjectCommand类实现文件下载。完整代码详见 Github 。 GetObjectCommand调用的 S3 API 为 GetObject, 具体参见GetObject API 文档。

    参数说明

    • Bucket： 文件所在的存储空间
    • Key: 文件在存储空间内的名称

    示例

    执行该示例前请确保配置文件的正确性
    以下代码段需要在上下文中运行

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    const s3 = require('./s3Client');
const { GetObjectCommand } = require("@aws-sdk/client-s3");
const fs = require('fs');
const path = require('path');

async function downloadFile(bucketName, keyName, downloadPath) {
    try {
        const params = {
            Bucket: bucketName,
            Key: keyName
        };
        const command = new GetObjectCommand(params);
        const response = await s3.send(command);
        const stream = response.Body;

        const filePath = path.resolve(downloadPath, keyName);
        const writeStream = fs.createWriteStream(filePath);

        stream.pipe(writeStream);

        return new Promise((resolve, reject) => {
            writeStream.on('finish', () => {
                console.log("File downloaded successfully to", filePath);
                resolve(filePath);
            });
            writeStream.on('error', (err) => {
                console.error("Error downloading file", err);
                reject(err);
            });
        });
    } catch (err) {
        console.error("Error downloading file", err);
        throw err;
    }
}

    在 Example/ 目录中运行以下命令执行该示例

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    $ node GetObject.js <bucketName> <keyName> <downloadPath>