NodeJS：從AWS S3存儲桶獲取映像

Question

我的客戶端在S3上存儲了大量映像。我們需要將這些圖像作爲迴應。這裏是我寫的代碼：

var AWS = require('aws-sdk'); 
    AWS.config.update({ 
     accessKeyId: "AccessKey", 
     secretAccessKey: "SecretAccessKey" 
    }); 
    var s3 = new AWS.S3(); 
    s3.getObject({ Bucket: "BucketName", Key: "ImageURL" }, 
     function(error, data) { 
      if (error != null) { 
       var _length = data.Body.length; 
       //Execution freezes here. Don't get any response. 
       res.writeHead(200, { 
        'Content-Type': 'image/jpeg', 
        'Content-Length': _length 
       }); 
       res.end(new Buffer(data.Body, 'binary')); 
       } 
     } 
    ); 

我們如何得到圖像的迴應？

Answer 1

var AWS = require('aws-sdk'); 
AWS.config.update({ 
    accessKeyId: "AccessKey", 
    secretAccessKey: "SecretAccessKey" 
}); 
var s3 = new AWS.S3(); 
s3.getObject({ Bucket: "BucketName", Key: "ETag.jpeg" }, 
    function(error, data) { 
     if (error != null) { 
      alert("Failed to retrieve an object: " + error); 
     } else { 
      alert("Loaded " + data.ContentLength + " bytes");      
     } 
    } 
);