node.js - nodejs - How to read and output jpg image?

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node.js - nodejs - How to read and output jpg image?

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

I've been trying to find an example of how to read a jpeg image and then show the image.

var http = require('http'), fs = require('fs');

http.createServer(function (req, res) {
    res.writeHead(200, {'Content-Type': 'text/html'});

fs.readFile('image.jpg', function (err, data) {
  if (err) throw err;
  res.write(data);
});

res.end();
}).listen(8124, "127.0.0.1");
console.log('Server running at http://127.0.0.1:8124/');

Tried the following code but I think the encoding needs to be set as buffer. Using console.log it outputs 'Object' for the data.

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1 Answer

深蓝 · Answer 1 · 2021-10-17T01:38:27+0000

Here is how you can read the entire file contents, and if done successfully, start a webserver which displays the JPG image in response to every request:

var http = require('http')
var fs = require('fs')

fs.readFile('image.jpg', function(err, data) {
  if (err) throw err // Fail if the file can't be read.
  http.createServer(function(req, res) {
    res.writeHead(200, {'Content-Type': 'image/jpeg'})
    res.end(data) // Send the file data to the browser.
  }).listen(8124)
  console.log('Server running at http://localhost:8124/')
})

Note that the server is launched by the "readFile" callback function and the response header has Content-Type: image/jpeg.

[Edit] You could even embed the image in an HTML page directly by using an <img> with a data URI source. For example:

  res.writeHead(200, {'Content-Type': 'text/html'});
  res.write('<html><body><img src="data:image/jpeg;base64,')
  res.write(Buffer.from(data).toString('base64'));
  res.end('"/></body></html>');

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