nodejs 文本逐行读写功能的实现

var fs = require(‘fs-extra‘);var os = require(‘os‘);var rl = ?require(‘readline‘);/** * 按行读写，无读取内容的处理，类似单纯的复制功能 * @param {string} readName ?* @param {string} writeName ?*/var readWriteFileByLine = function(readName, writeName){ ???var readStream = ?fs.createReadStream(readName); ???var writeStream = fs.createWriteStream(writeName); ???var readLine = rl.createInterface({ ???????input: readStream, ???????output: writeStream, ???????terminal: true ???})}/** * 按行读写，中间包涵对读取的行内容的处理 * @param {string} readName ?* @param {string} writeName ?* @param {Function} callback ?*/var readWriteFileByLineWithProcess = function(readName,writeName,callback){ ???var readStream = fs.createReadStream(readName); ???var writeStream = fs.createWriteStream(writeName); ???var readLine = rl.createInterface({ ???????input: readStream ???}) ???readLine.on(‘line‘,function(line){ ???????var rs = callback(line); ???????writeStream.write(rs + os.EOL); ???})}exports.readWriteFileByLine = readWriteFileByLine;exports.readWriteFileByLineWithProcess = readWriteFileByLineWithProcess

var rwByLine = require(‘./lib/readWriteFileByLine.js‘)//按行读写，对行做字符替换处理var readName = ‘./obj.txt‘;var writeName = ‘./rt.txt‘;rwByLine.readWriteFileByLineWithProcess(readName,writeName,function(line){ ???var rs = line.toString().replace("\\",‘\/‘); ???return rs;})//按行读写，无处理readName = ‘./obj.txt‘;writeName = ‘./rt1.txt‘;rwByLine.readWriteFileByLine(readName,writeName);