Question

我在Node.Js中尝试从Amazon S3存储中获取对象。

当我将其保存到文件时，这非常有效。

amazon.getObject = function () { var options = { BucketName : 'mybucket', ObjectName : 'path/to/my.json', ResponseContentType : 'application/json' }; s3.GetObject(options, function(err, data) { var fs = require('fs'); var fd = fs.openSync('helloaa.json', 'w+'); fs.writeSync(fd, data.Body, 0, data.Body.length, 0); fs.closeSync(fd); }); };

在。 helloaa.json是：

{ "hello": 1, "world": 3 }

但是。我不想将数据写入磁盘上的文件。

我希望用JSON.parse（）解析这个json对象;

当我用：
打印对象时
s3.GetObject(options, function(err, data) { console.log(JSON.stringify(data)); });

在控制台中是这样的：

{"StatusCode":200,"Headers":{"x-amz-id-2":"N1gDLPam+fDCLWd9Q2NI62hizH7eXAjg 61oLYOkanLoSlqUlDl6tqasbfdQXZ","x-amz-request-id":"C53957DAF635D3FD","date" :"Mon, 31 Dec 2012 00:11:48 GMT","last-modified":"Sun, 30 Dec 2012 23:22:57 "etag":"\"8677a54c9b693bb6fc040ede8cc6a\"","accept-ranges":"bytes","co ntent-type":"application/json","content-length":"176","server":"AmazonS3"}, "Body":{"0":123,"1":10,"2":32,"3":32,"4":32,"5":32,"6":34,"7":105,"8":100," 9":34,"10":58,"11":32,"12":49,"13":44,"14":10,"15":32,"16":32,"17":32,"18":

这是什么？

我该如何解析它？

是流吗？

我可以在NodeJs中将流保存到对象吗？

Answer 1

您是否尝试过data.Body.toString()？

Answer 2

我必须在转换为字符串后解析JSON：

    var fileContents = data.Body.toString();
    var json = JSON.parse(fileContents);
    console.log(json);

Answer 3

将解析后的响应转换为base64，然后就可以直接作为HTML的image标签中的source了。可以通过 Amazon REST API 进行 Lambda 调用

const AWS = require('aws-sdk');
//*/ get reference to S3 client 
var s3 = new AWS.S3();
exports.handler = (event, context, callback) => {
    var params = {
  "Bucket": "bucket-name",
  "Key": "object-name"  
    };
    s3.getObject(params, function(err, data){
       if(err) {
           callback(err, null);
       } else {
           let image = new Buffer(data.Body).toString('base64');
           image = "data:"+data.ContentType+";base64,"+image;
           let response = {
        "statusCode": 200,
        "headers": {
            "Access-Control-Allow-Origin": "*",
            'Content-Type': data.ContentType
        },
        "body":image,
        "isBase64Encoded": true
    };
           callback(null, response);
    }
    });
    
};

在Nodejs中将流解析为对象

3 个答案: