錯誤：ENOENT，沒有這樣的文件或目錄節點JS

Question

我試圖upoad和下載圖像通過Node.js的服務器，我使用下面的代碼：

var http = require('http'), 
    path = require('path'), 
    os = require('os'), 
    fs= require('fs'),url = require('url'); 

var Busboy = require('busboy'); 

http.createServer(function(req, res) { 
    if (req.method === 'POST') { 
    var busboy = new Busboy({ headers: req.headers }); 
    busboy.on('file', function(fieldname, file, filename, encoding, mimetype) { 
     var saveTo = ".\\Images\\"+filename; 
     file.pipe(fs.createWriteStream(saveTo)); 
    }); 
    busboy.on('finish', function() { 
     res.writeHead(200, { 'Connection': 'close' }); 
     res.end("That's all folks!"); 
    }); 
    return req.pipe(busboy); 
    } 
else{ 
    var request = url.parse(req.url, true); 
    console.log(request); 
    var action = request.pathname; 
    console.log(action); 
    if (action !== '/') { 
     var img = fs.readFileSync('.'+action); 
     res.writeHead(200, {'Content-Type': 'image/gif' }); 
     res.end(img, 'binary'); 
    } else { 
     res.writeHead(200, {'Content-Type': 'text/plain' }); 
     res.end('Hello World \n'); 
    } 
    } 
    res.writeHead(404); 
    res.end(); 
}).listen(8082, function() { 
    console.log('Listening for requests'); 
}); 

當我試圖讓使用HTTP GET在http://localhost:8082/images/betty.jpg這個服務器映像，請求得到滿足，圖像被收到，但它也將引發以下錯誤：

  ^
fs.js:438 
    return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode); 
       ^
Error: ENOENT, no such file or directory 'D:\ImageUploadService\favicon.ico' 
    at Object.fs.openSync (fs.js:438:18) 
    at Object.fs.readFileSync (fs.js:289:15) 
    at Server.<anonymous> (D:\ImageUploadService\service.js:27:20) 
    at Server.emit (events.js:98:17) 
    at HTTPParser.parser.onIncoming (http.js:2112:12) 
    at HTTPParser.parserOnHeadersComplete [as onHeadersComplete] (http.js:121:23 
) 
    at Socket.socket.ondata (http.js:1970:22) 
    at TCP.onread (net.js:527:27) 'D:\ImageUploadService\favicon.ico' 
    at Object.fs.openSync (fs.js:438:18) 
    at Object.fs.readFileSync (fs.js:289:15) 
    at Server.<anonymous> (D:\ImageUploadService\service.js:27:20) 
    at Server.emit (events.js:98:17) 
    at HTTPParser.parser.onIncoming (http.js:2112:12) 
    at HTTPParser.parserOnHeadersComplete [as onHeadersComplete] (http.js:121:23 
) 
    at Socket.socket.ondata (http.js:1970:22) 
    at TCP.onread (net.js:527:27) 

它似乎是在尋找一些favicon.ico的。可能是什麼問題呢？？

Answer 1

你需要嘗試讀取它之前檢查文件是否與fs.existsSync(path)存在：

if (action !== '/' && fs.existsSync('.'+action)) { 
    var img = fs.readFileSync('.'+action); 
    res.writeHead(200, {'Content-Type': 'image/gif' }); 
    res.end(img, 'binary'); 
} else {