重学Node 0x3 RESTful Services and Express

RESTful

Representational State Transfer

 Express

// index.js
const express = require('express')

const app = express()

app.get('/', (req, res) => {
  res.send('Helo Express')
})

app.listen(3000, () => {
  console.log('Listening on port 3000...')
})

 nodeMon

npm i -g nodemon

nodemon : 无法加载文件 C:\Users\cell\AppData\Roaming\npm\nodemon.ps1，因为在此系统上禁止运行脚本。有关详细信息，请参阅 https:/go.microsoft.com/fwlink/?LinkID=135170 中的 about_Execution_Policies。 

解决方案：

（1） 管理员身份运行PowerShell

（2）输入下面命令并回车

set-ExecutionPolicy RemoteSigned

（3）选择Y 

（4）重新尝试

 Handling HTTP GET Request

// index.js
const express = require('express')

const app = express()

const courses = [
  { id: 1, name: 'course1' },
  { id: 2, name: 'course2' },
  { id: 3, name: 'course3' },
]
app.get('/', (req, res) => {
  res.send('Helo Express!')
})

app.get('/api/courses', (req, res) => {
  res.send(courses)
})

app.get('/api/courses/:id', (req, res) => {
  const id = req.params.id
  const result = courses.find(c => c.id === parseInt(id))
  if (!result) {
    res.status(404).send('The course with the given ID was not found!')
  } else {
    res.send(result)
  }
})

// PORT 
const port = process.env.PORT || 3000
app.listen(port, () => {
  console.log(`Listening on port ${port}...`)
})

Handling HTTP POST Request

app.use(express.json())
// ...
app.post('/api/courses', (req, res) => {
  const { name } = req.body
  const course = {
    id: courses.length + 1,
    name
  }
  courses.push(course)
  res.send(course)
})

使用Joi进行验证

const Joi = require('joi')
app.post('/api/courses', (req, res) => {
  const scheam = {
    name: Joi.string().required()
  }
  const result = Joi.validate(req.body, scheam)
  if (result.error) {
    res.status(400).send(result.error.details[0].message)
    return
  }
  const course = {
    id: courses.length + 1,
    name: req.body.name
  }
  courses.push(course)
  res.send(course)
})

Handling HTTP PUT Request

app.put('/api/courses/:id', (req, res) => {
  // 查找当前课程
  const id = req.params.id
  const course = courses.find(c => c.id === parseInt(id))
  if (!course) {
    res.status(404).send('The course with the given ID was not found!')
    return
  }
  // 验证参数
  const { error } = validateCourse(req.body)
  if (error) {
    res.status(400).send(error.details[0].message)
    return
  }
  // 更新课程
  course.name = req.body.name
  res.send(course)
})

function validateCourse(course) {
  const scheam = {
    name: Joi.string().required()
  }
  return Joi.validate(course, scheam)
}

Handling HTTP DELETE Request

app.delete('/api/courses/:id', (req, res) => {
  // 查找课程
  const id = req.params.id
  const course = courses.find(c => c.id === parseInt(id))
  if (!course) {
    return res.status(404).send('The course with the given ID was not found!')
  }
  // 删除课程
  const targetIndex = courses.indexOf(course)
  console.log(targetIndex)
  courses.splice(targetIndex, 1)
  res.send(course)
})

 

来源：CSDN

作者：cell006

链接：https://blog.csdn.net/funkstill/article/details/104184157