nodejs http
宁静致远 7/19/2020 nodejs
# 请求概述
- DNS解析,建立TCP链接,发送http请求
- server接收到http请求,处理,返回
# 处理http请求
- get 请求和querystring
- post请求和postdata
- 路由
// 简单实例
const http = require('http')
const server = http.createServer((req, res) => {
res.end('hello world')
})
server.listen(8000)
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# 处理get请求
- get 请求,即客户端要向server端获取数据,如查询列表
- 通过querystring来传递数据,如 index.html?a=100&b=200
- 浏览器直接访问,就发送了get请求
const http = require('http')
const querystring = require('querystring')
const server = http.createServer((req, res) => {
console.log(req.method) // 获取get
const url = req.url // 获取完整的url
req.query = querystring.parse(url.split('?')[1]) // 解析querystring
res.end(JSON.stringify(req.query)) // 返回querystring
})
server.listen(8000)
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# 处理post 请求
- post 请求,客户端要向服务端传递数据,如,新建
- 通过 post data 传递数据,
- 浏览器无法直接模拟,需要手写ajax, 或者postman
const http = require('http')
// post
const server = http.createServer((req, res) => {
if (req.method === 'POST') {
// req 数据格式
console.log('req context-type: ', req.headers['content-type'])
// 接收数据
let postData = ''
req.on('data', chunk => {
postData += chunk.toString()
})
req.on('end', () => {
console.log('postData: ', postData)
res.end(postData)
})
}
})
server.listen(8000)
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const http = require('http')
const querystring = require('querystring')
const server = http.createServer((req, res) => {
const method = req.method
const url = req.url
const path = url.split('?')[0]
const query = querystring.parse(url.split('?')[1])
// 返回的数据
const resData = {
method,
path,
url,
query
}
// 设置返回格式 json
res.setHeader('Content-type', 'application/json')
// 返回get
if (method === 'GET') {
console.log('resData', resData)
res.end(JSON.stringify(resData))
}
// 返回post
if (method === 'POST') {
let postData = ''
req.on('data', chunk => {
postData += chunk.toString()
})
req.on('end', () => {
resData.postData = postData
console.log('resData', resData)
res.end(JSON.stringify(resData))
})
}
})
server.listen(9527)
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