Question

我正在尝试使用node.js编写自己的文件共享器应用程序。我写了发件人代码和接收者代码。发送文本文件时工作正常，但尝试发送.jpg或.mp3等文件时失败。问题出在接收端，文件被收到“损坏”。以下是我的发件人代码和收件人代码

发信人：

const net = require('net');
const fs = require('fs');
var destAddr = process.argv[2],
  destPort = process.argv[3],
  sourceFile = process.argv[4];
const client = net.connect(destPort, destAddr, function() {
  /*fs.readFile(sourceFile,function(err,data){
		if(data)
		{
			if(client.write(data)==true)
			{
				console.log("Data [ size: %d ] written succesfully",data.length);
				client.destroy();
			}
			else console.log("Data write failure");
		}
		else
			client.write("err");
	});
	*/
  var fileStream = fs.createReadStream(sourceFile);
  fileStream.on('error', function(err) {
    console.log(err);
  });
  fileStream.on('open', function() {
    fileStream.pipe(client);
  });
});

接收器：

const net = require('net');
const fs = require('fs');
var fileName = 'receivedfile.' + process.argv[2];
// process.argv[2] is the file extension to be used to write the file to disk at the receiving end;
const options = {
  allowHalfOpen: false,
  pauseOnConnect: false,
};
var fileCount = 0;
const server = net.createServer(options, function(listener) {
  listener.on('data', (data) => {
    console.log("Data [ size: %d ] received", data.length);
    fs.writeFile(fileName, data, function(err) {
      if (err) console.log("Error writing file to disk");
      else {
        console.log("Write successful");
        fileCount++;
        console.log("[ Files received =] %d", fileCount);
        console.log("Press Ctr+c to exit");
      }
    });
  });
}).listen(8001, () => {
  console.log("Client is waiting for the file on port 8001");
});

我哪里错了？

Answer 1

data事件可以在连接的生命周期内多次触发，具有各种大小的数据块。

相反，使用流可能更容易：

const server = net.createServer(listener => {
  let stream = fs.createWriteStream(fileName);

  listener.on('error', err => console.log('socket error', err));
  stream  .on('error', err => console.log('file error', err));

  listener.pipe(stream).on('finish', () => {
    console.log("Write successful");
    fileCount++;
    console.log("[ Files received =] %d", fileCount);
    console.log("Press Ctr+c to exit");
  })
}).listen(...);

在node.js中使用tcp发送大文件但接收到损坏的文件

1 个答案: