AWS S3大文件浏览器直接下载

vpstart

如果您需要下载非常大的文件，可以考虑使用分块下载（chunked download），这可以帮助您避免内存不足或网络连接中断的问题。

以下是一个使用PHP分块下载大文件的示例代码：

<?php
use Aws\S3\S3Client;
use Aws\S3\Exception\S3Exception;

// Set the S3 bucket name and object key
$bucket_name = 'your-bucket-name';
$object_key = 'your-object-key';

// Set the size of each chunk in bytes
$chunk_size = 1024 * 1024; // 1 MB

// Initiate the S3 client
$s3 = new S3Client([
    'region' => 'your-region',
    'version' => 'latest',
    'credentials' => [
        'key'    => 'your-aws-access-key-id',
        'secret' => 'your-aws-secret-access-key',
    ],
]);

try {
    // Get the size of the S3 object
    $object_size = $s3->headObject([
        'Bucket' => $bucket_name,
        'Key' => $object_key
    ])['ContentLength'];

// Set the HTTP headers to download the file
header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=\"$object_key\"");
header("Content-Length: $object_size");

// Loop through the file and download it in chunks
$start_byte = 0;
$end_byte = $chunk_size - 1;
while ($start_byte < $object_size) {
    $result = $s3->getObject([
        'Bucket' => $bucket_name,
        'Key' => $object_key,
        'Range' => "bytes=$start_byte-$end_byte"
    ]);
    echo $result['Body'];

    $start_byte += $chunk_size;
    $end_byte += $chunk_size;
    if ($end_byte > $object_size) {
        $end_byte = $object_size - 1;
    }
}
} catch (S3Exception $e) {
    echo "Error downloading file: " . $e->getMessage() . "\n";
}

这个示例代码将S3存储桶中的一个对象按照$chunk_size指定的大小分成多个块，逐块下载并输出到浏览器。每次下载时，使用Range头指定要下载的字节范围。由于每个块的大小是$chunk_size，所以可以避免一次性下载整个文件造成的内存不足和网络连接中断的问题。