Node.js readline 逐行读取、写入文件内容的示例

本文介绍了运用readline逐行读取的两种实现，分享给大家，具体如下：

什么是Readline

Readline是Node.js里实现标准输入输出的封装好的模块，通过这个模块我们可以以逐行的方式读取数据流。使用require(“readline”)可以引用模块。

效果图如下：

左边1.log 为源文件

右边1.readline.log为复制后的文件

下边为命令行输出

实现方式一:

var readline = require(\'readline\'); 
var fs = require(\'fs\'); 
var os = require(\'os\'); 
var fReadName = \'./1.log\'; 
var fWriteName = \'./1.readline.log\'; 
var fRead = fs.createReadStream(fReadName); 
var fWrite = fs.createWriteStream(fWriteName); 
var objReadline = readline.createInterface({ 
 input: fRead, 
// 这是另一种复制方式，这样on(\'line\')里就不必再调用fWrite.write(line)，当只是纯粹复制文件时推荐使用 
// 但文件末尾会多算一次index计数 sodino.com 
// output: fWrite, 
// terminal: true 
}); 
 
 
var index = 1; 
objReadline.on(\'line\', (line)=>{ 
 var tmp = \'line\' + index.toString() + \':\' + line; 
 fWrite.write(tmp + os.EOL); // 下一行 
 console.log(index, line); 
 index ++; 
}); 
 
objReadline.on(\'close\', ()=>{ 
 console.log(\'readline close...\'); 
}); 

实现方式二:

var readline = require(\'readline\'); 
var fs = require(\'fs\'); 
var os = require(\'os\'); 
 
var fReadName = \'./1.log\'; 
var fWriteName = \'./1.readline.log\'; 
var fRead = fs.createReadStream(fReadName); 
var fWrite = fs.createWriteStream(fWriteName); 
 
var enableWriteIndex = true; 
fRead.on(\'end\', ()=>{ 
 console.log(\'end\'); 
 enableWriteIndex = false; 
}); 
 
var objReadline = readline.createInterface({ 
 input: fRead, 
 output: fWrite, 
 terminal: true 
}); 
 
var index = 1; 
fWrite.write(\'line\' + index.toString() +\':\'); 
objReadline.on(\'line\', (line)=>{ 
 console.log(index, line); 
 if (enableWriteIndex) { 
 // 由于readline::output是先写入后调用的on(\'line\')事件， 
 // 所以已经读取文件完毕时就不需要再写行号了... sodino.com 
 index ++; 
 var tmp = \'line\' + index.toString() + \':\'; 
 fWrite.write(tmp); 
 } 
}); 


objReadline.on(\'close\', ()=>{ 
 console.log(\'readline close...\'); 
}); 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。