Question

看着 http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3/ManagedUpload.html#constructor-property

var upload = new AWS.S3.ManagedUpload({
  params: {Bucket: 'bucket', Key: 'key', Body: stream}
});

Body假设是stream。如果我想在浏览器中使用此stream，如何从本地文件创建ManagedUpload？

stream与streamObject

中的uploadPart不同

Body: new Buffer('...') || 'STRING_VALUE' || streamObject,

http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#uploadPart-property

Answer 1

呀。他们的文件很可怕。他们没有很好的例子。您可以尝试使用FileReader对象和readAsArrayBuffer方法。类似的东西：

    var reader = new FileReader();

    // Closure to capture the file information.
    reader.onload = (function(file) {
    return function(e) {
        var upload;
        if (e.eventPhase == 2) {
            upload = new AWS.S3.ManagedUpload({
                params: {Bucket: 'annuals-original', Key: 'name', Body: e.currentTarget.result}
            }).send(function(err, data) {
                console.log(err, data);
            });
         };
    })(f);

    // Read in the image file 
    reader.readAsArrayBuffer(f);

您可以将eventHandler附加到输入标记。

<input type="file" id="input" multiple onchange="handleFile(this.files)">

然后将文件传递给处理程序。

inputElement.addEventListener("change", handleFile, false);

AWS JS S3：ManagedUpload中“流”的类型是什么？

1 个答案: