nodejs - 如何读取和输出jpg图像？ [英] nodejs - How to read and output jpg image?
问题描述
I've been trying to find an example of how to read a jpeg image and then show the image.我一直在试图找到一个如何读取jpeg图像然后显示图像的例子。 http = require（'http'），fs = require（'fs'）;
$ b $ 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/'）;
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/');
尝试了下面的代码，但我认为编码需要设置为当我控制台时显示缓冲区对象。记录数据。
Tried the following code but I think the encoding needs to be set as buffer object appears when I console.log the data.
推荐答案
这里是如何读取整个文件的内容，如果成功的话，启动一个webserver来显示这个JPG图片响应每个请求：
$ b
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')
, 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/');
});
请注意，服务器是通过readFile回调函数启动的，响应头是 Content-Type：image / jpeg 。
Note that the server is launched by the "readFile" callback function and the response header has Content-Type: image/jpeg.
一个HTML页面直接通过使用< img> 与数据URI来源。例如：
$ b
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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