Node.js 使用流克隆文件
示例
该程序说明了如何使用文件系统模块提供的createReadStream()和createWriteStream()功能使用可读和可写流复制文件。
//需要文件系统模块
var fs = require('fs');
/*
Create readable stream to file in current directory (__dirname) named 'node.txt'
Use utf8 encoding
Read the data in 16-kilobyte chunks
*/
var readable = fs.createReadStream(__dirname + '/node.txt', { encoding: 'utf8', highWaterMark: 16 * 1024 });
//创建可写流
var writable = fs.createWriteStream(__dirname + '/nodeCopy.txt');
//将每个数据块写入可写流
readable.on('data', function(chunk) {
writable.write(chunk);
});