nodejs同步逐行读取大文件？ [英] nodejs synchronization read large file line by line?

问题描述

我有一个大文件（utf8）。我知道 fs.createReadStream 可以创建流来读取大文件，但不能同步。所以我尝试使用 fs.readSync ，但读取的文本像迈 。

  var fs = require（'fs'）; 
 var util = require（'util'）; 
 var textPath = __dirname +'/people-daily.txt'; 
 var fd = fs.openSync（textPath，r）; 
 var text = fs.readSync（fd，4，0，utf8）; 
 console.log（util.inspect（text，true，null））; 
  

解决方案

使用 https://github.com/nacholibre/node-readlines

  var lineByLine = require（'n-readlines'）; 
 var liner = new lineByLine（'./ textFile.txt'）; 
 
 var line; 
 var lineNumber = 0; 
 while（line = liner.next（））{
 console.log（'Line'+ lineNumber +'：'+ line.toString（'ascii'））; 
 lineNumber ++; 
} 
 
 console.log（'end of line reached'）; 
  

I have a large file (utf8). I know fs.createReadStream can create stream to read a large file, but not synchronized. So i try to use fs.readSync, but read text is broken like "迈�".

var fs = require('fs');
var util = require('util');
var textPath = __dirname + '/people-daily.txt';   
var fd = fs.openSync(textPath, "r");
var text = fs.readSync(fd, 4, 0, "utf8");
console.log(util.inspect(text, true, null));

解决方案

use https://github.com/nacholibre/node-readlines

var lineByLine = require('n-readlines');
var liner = new lineByLine('./textFile.txt');

var line;
var lineNumber = 0;
while (line = liner.next()) {
    console.log('Line ' + lineNumber + ': ' + line.toString('ascii'));
    lineNumber++;
}

console.log('end of line reached');

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