javascript - 从nodejs中的url读取图像

Question

我想从 url 读取图像并将其存储在 mongo db 中。我基本上已经读取了字符串值并完成了上述过程。但是我被困在如何读取图像上。任何想法都会非常有帮助。

Answer 1

使用节点 0.8.8 和mongojs进行测试。

var http = require("http");
var mjs = require("mongojs");

// url of the image to save to mongo
var image_url = "http://i.imgur.com/5ToTZky.jpg";

var save_to_db = function(type, image) {

   // connect to database and use the "test" collection
   var db = mjs.connect("mongodb://localhost:27017/database", ["test"]);

   // insert object into collection 
   db.test.insert({ type: type, image: image }, function() {
      db.close();
   });

};

http.get(image_url, function(res) {

   var buffers = [];
   var length = 0;

   res.on("data", function(chunk) {

      // store each block of data
      length += chunk.length;
      buffers.push(chunk);

   });

   res.on("end", function() {

      // combine the binary data into single buffer
      var image = Buffer.concat(buffers);

      // determine the type of the image
      // with image/jpeg being the default
      var type = 'image/jpeg';
      if (res.headers['content-type'] !== undefined)
         type = res.headers['content-type'];

      save_to_db(type, image);

   });

});