Node.js readline 逐行读取、写入文件内容的示例
时间：2021-01-27 10:42:00 | 栏目：NodeJS | 点击：次
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...');
});