//标准输入输出
process.stdin.pipe(process.stdout)


//最主要
const http = require('http')
const server = http.createServer((req,res)=>{
    if(req.method === 'POST'){
        req.pipe(res)//最重要，水管原理，资源入pipe资源出
    }
})
server.listen(8000)

//复制文件
const fs = require('fs')
const path = require('path')

const fileName1 = path.resolve(__dirname,'data.txt')
const fileName2 = path.resolve(__dirname,'data-bak.txt')

const readStream = fs.createReadStream(fileName1)
const writeStream = fs.createWriteStream(fileName2)

//水桶1，pipe管道，水桶2
readStream.pipe(writeStream)
//数据流动监听
readStream.on('data',chunk=>{
    console.log('数据copy监听，',chunk.toString())
})
//copy执行
readStream.on('end',()=>{
    console.log('copy done拷贝完成！')
})

代码终端执行