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node-server/app.js

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+const express = require('express')
+const mysql = require('mysql')
+const constant = require('./const')
+const cors = require('cors') // cors库，跨域
+const voice = require('./voice')
+
+const app = express()
+// 使用cors,原理?
+app.use(cors())
+// 根目录
+app.get('/', (req, res) => {
+  res.send(new Date().toDateString())
+})
+// 连接数据库
+function connect() {
+  return mysql.createConnection({
+    host: constant.dbHost,
+    user: constant.dbUser,
+    password: constant.dbPwd,
+    database: 'book'
+  })
+}
+
+function randomArray(n, l) {
+  let rnd = []
+  for (let i = 0; i < n; i++) {
+    rnd.push(Math.floor(Math.random() * l))
+  }
+  return rnd
+}
+
+function createGuessYouLike(data) {
+  const n = parseInt(randomArray(1, 3)) + 1
+  data['type'] = n
+  switch (n) {
+    case 1:
+      data['result'] = data.id % 2 === 0 ? '《Executing Magic》' : '《Elements Of Robotics》'
+      break
+    case 2:
+      data['result'] = data.id % 2 === 0 ? '《Improving Psychiatric Care》' : '《Programming Languages》'
+      break
+    case 3:
+      data['result'] = '《Living with Disfigurement》'
+      data['percent'] = data.id % 2 === 0 ? '92%' : '97%'
+      break
+  }
+  return data
+}
+
+function createRecommendData(data) {
+  data['readers'] = Math.floor(data.id / 2 * randomArray(1, 100))
+  return data
+}
+
+function createData(results, key) {
+  return handleData(results[key])
+}
+
+function handleData(data) {
+  if (!data.cover.startsWith('http://')) {
+    data['cover'] = `${constant.resUrl}/img${data.cover}`
+  }
+  data['selected'] = false
+  data['private'] = false
+  data['cache'] = false
+  data['haveRead'] = 0
+  return data
+}
+
+function createCategoryIds(n) {
+  const arr = []
+  constant.category.forEach((item, index) => {
+    arr.push(index + 1)
+  })
+  const result = []
+  for (let i = 0; i < n; i++) {
+    // 获取的随机数不能重复
+    const ran = Math.floor(Math.random() * (arr.length - i))
+    // 获取分类对应的序号
+    result.push(arr[ran])
+    // 将已经获取的随机数取代，用最后一位数
+    arr[ran] = arr[arr.length - i - 1]
+  }
+  return result
+}
+
+function createCategoryData(data) {
+  const categoryIds = createCategoryIds(6)
+  const result = []
+  categoryIds.forEach(categoryId => {
+    const subList = data.filter(item => item.category === categoryId).slice(0, 4)
+    subList.map(item => {
+      return handleData(item)
+    })
+    result.push({
+      category: categoryId,
+      list: subList
+    })
+  })
+  return result.filter(item => item.list.length === 4)
+}
+// home页API
+app.get('/book/home', (req, res) => {
+  const conn = connect()
+  conn.query('select * from book where cover != \'\'',
+    (err, results) => {
+      const length = results.length
+      const guessYouLike = []
+      const banner = constant.resUrl + '/home_banner2.jpg'
+      const recommend = []
+      const featured = []
+      const random = []
+      const categoryList = createCategoryData(results)
+      const categories = [
+        {
+          category: 1,
+          num: 56,
+          img1: constant.resUrl + '/cover/cs/A978-3-319-62533-1_CoverFigure.jpg',
+          img2: constant.resUrl + '/cover/cs/A978-3-319-89366-2_CoverFigure.jpg'
+        },
+        {
+          category: 2,
+          num: 51,
+          img1: constant.resUrl + '/cover/ss/A978-3-319-61291-1_CoverFigure.jpg',
+          img2: constant.resUrl + '/cover/ss/A978-3-319-69299-9_CoverFigure.jpg'
+        },
+        {
+          category: 3,
+          num: 32,
+          img1: constant.resUrl + '/cover/eco/A978-3-319-69772-7_CoverFigure.jpg',
+          img2: constant.resUrl + '/cover/eco/A978-3-319-76222-7_CoverFigure.jpg'
+        },
+        {
+          category: 4,
+          num: 60,
+          img1: constant.resUrl + '/cover/edu/A978-981-13-0194-0_CoverFigure.jpg',
+          img2: constant.resUrl + '/cover/edu/978-3-319-72170-5_CoverFigure.jpg'
+        },
+        {
+          category: 5,
+          num: 23,
+          img1: constant.resUrl + '/cover/eng/A978-3-319-39889-1_CoverFigure.jpg',
+          img2: constant.resUrl + '/cover/eng/A978-3-319-00026-8_CoverFigure.jpg'
+        },
+        {
+          category: 6,
+          num: 42,
+          img1: constant.resUrl + '/cover/env/A978-3-319-12039-3_CoverFigure.jpg',
+          img2: constant.resUrl + '/cover/env/A978-4-431-54340-4_CoverFigure.jpg'
+        },
+        {
+          category: 7,
+          num: 7,
+          img1: constant.resUrl + '/cover/geo/A978-3-319-56091-5_CoverFigure.jpg',
+          img2: constant.resUrl + '/cover/geo/978-3-319-75593-9_CoverFigure.jpg'
+        },
+        {
+          category: 8,
+          num: 18,
+          img1: constant.resUrl + '/cover/his/978-3-319-65244-3_CoverFigure.jpg',
+          img2: constant.resUrl + '/cover/his/978-3-319-92964-4_CoverFigure.jpg'
+        },
+        {
+          category: 9,
+          num: 13,
+          img1: constant.resUrl + '/cover/law/2015_Book_ProtectingTheRightsOfPeopleWit.jpeg',
+          img2: constant.resUrl + '/cover/law/2016_Book_ReconsideringConstitutionalFor.jpeg'
+        },
+        {
+          category: 10,
+          num: 24,
+          img1: constant.resUrl + '/cover/ls/A978-3-319-27288-7_CoverFigure.jpg',
+          img2: constant.resUrl + '/cover/ls/A978-1-4939-3743-1_CoverFigure.jpg'
+        },
+        {
+          category: 11,
+          num: 6,
+          img1: constant.resUrl + '/cover/lit/2015_humanities.jpg',
+          img2: constant.resUrl + '/cover/lit/A978-3-319-44388-1_CoverFigure_HTML.jpg'
+        },
+        {
+          category: 12,
+          num: 14,
+          img1: constant.resUrl + '/cover/bio/2016_Book_ATimeForMetabolismAndHormones.jpeg',
+          img2: constant.resUrl + '/cover/bio/2017_Book_SnowSportsTraumaAndSafety.jpeg'
+        },
+        {
+          category: 13,
+          num: 16,
+          img1: constant.resUrl + '/cover/bm/2017_Book_FashionFigures.jpeg',
+          img2: constant.resUrl + '/cover/bm/2018_Book_HeterogeneityHighPerformanceCo.jpeg'
+        },
+        {
+          category: 14,
+          num: 16,
+          img1: constant.resUrl + '/cover/es/2017_Book_AdvancingCultureOfLivingWithLa.jpeg',
+          img2: constant.resUrl + '/cover/es/2017_Book_ChinaSGasDevelopmentStrategies.jpeg'
+        },
+        {
+          category: 15,
+          num: 2,
+          img1: constant.resUrl + '/cover/ms/2018_Book_ProceedingsOfTheScientific-Pra.jpeg',
+          img2: constant.resUrl + '/cover/ms/2018_Book_ProceedingsOfTheScientific-Pra.jpeg'
+        },
+        {
+          category: 16,
+          num: 9,
+          img1: constant.resUrl + '/cover/mat/2016_Book_AdvancesInDiscreteDifferential.jpeg',
+          img2: constant.resUrl + '/cover/mat/2016_Book_ComputingCharacterizationsOfDr.jpeg'
+        },
+        {
+          category: 17,
+          num: 20,
+          img1: constant.resUrl + '/cover/map/2013_Book_TheSouthTexasHealthStatusRevie.jpeg',
+          img2: constant.resUrl + '/cover/map/2016_Book_SecondaryAnalysisOfElectronicH.jpeg'
+        },
+        {
+          category: 18,
+          num: 16,
+          img1: constant.resUrl + '/cover/phi/2015_Book_TheOnlifeManifesto.jpeg',
+          img2: constant.resUrl + '/cover/phi/2017_Book_Anti-VivisectionAndTheProfessi.jpeg'
+        },
+        {
+          category: 19,
+          num: 10,
+          img1: constant.resUrl + '/cover/phy/2016_Book_OpticsInOurTime.jpeg',
+          img2: constant.resUrl + '/cover/phy/2017_Book_InterferometryAndSynthesisInRa.jpeg'
+        },
+        {
+          category: 20,
+          num: 26,
+          img1: constant.resUrl + '/cover/psa/2016_Book_EnvironmentalGovernanceInLatin.jpeg',
+          img2: constant.resUrl + '/cover/psa/2017_Book_RisingPowersAndPeacebuilding.jpeg'
+        },
+        {
+          category: 21,
+          num: 3,
+          img1: constant.resUrl + '/cover/psy/2015_Book_PromotingSocialDialogueInEurop.jpeg',
+          img2: constant.resUrl + '/cover/psy/2015_Book_RethinkingInterdisciplinarityA.jpeg'
+        },
+        {
+          category: 22,
+          num: 1,
+          img1: constant.resUrl + '/cover/sta/2013_Book_ShipAndOffshoreStructureDesign.jpeg',
+          img2: constant.resUrl + '/cover/sta/2013_Book_ShipAndOffshoreStructureDesign.jpeg'
+        }
+      ]
+      randomArray(9, length).forEach(key => {
+        guessYouLike.push(createGuessYouLike(createData(results, key)))
+      })
+      randomArray(3, length).forEach(key => {
+        recommend.push(createRecommendData(createData(results, key)))
+      })
+      randomArray(6, length).forEach(key => {
+        featured.push(createData(results, key))
+      })
+      randomArray(1, length).forEach(key => {
+        random.push(createData(results, key))
+      })
+      res.json({
+        guessYouLike,
+        banner,
+        recommend,
+        featured,
+        categoryList,
+        categories,
+        random
+      })
+      conn.end()
+    })
+})
+
+// 详情页API
+/* 数据库操作:1.sql语句 2.conn.query()查询 */
+app.get('/book/detail', (req, res) => {
+  const conn = connect()
+  const fileName = req.query.fileName
+  const sql = `select * from book where fileName='${fileName}'`
+  conn.query(sql, (err, results) => {
+    if (err) {
+      res.json({
+        error_code: 1,
+        msg: '电子书详情获取失败'
+      })
+    } else {
+      if (results && results.length === 0) {
+        res.json({
+          error_code: 1,
+          msg: '电子书详情获取失败'
+        })
+      } else {
+        const book = handleData(results[0])
+        res.json({
+          error_code: 0,
+          msg: '获取成功',
+          data: book
+        })
+      }
+    }
+    conn.end() // 注意关闭数据库链接
+  })
+})
+
+// list路由API 返回数据 json:{err_code: '', msg: '', data: data, total: Number}
+app.get('/book/list', (req, res) => {
+  const conn = connect()
+  conn.query('select * from book where cover!=\'\'',
+    (err, results) => {
+      if (err) {
+        res.json({
+          error_code: 1,
+          msg: '获取失败'
+        })
+      } else {
+        results.map(item => handleData(item))
+        const data = {}
+        constant.category.forEach(categoryText => {
+          data[categoryText] = results.filter(item => item.categoryText === categoryText)
+        })
+        res.json({
+          error_code: 0,
+          msg: '获取成功',
+          data: data,
+          total: results.length
+        })
+      }
+      conn.end()
+    })
+})
+
+// flat-list路由API
+app.get('/book/flat-list', (req, res) => {
+  const conn = connect()
+  conn.query('select * from book where cover!=\'\'',
+    (err, results) => {
+      if (err) {
+        res.json({
+          error_code: 1,
+          msg: '获取失败'
+        })
+      } else {
+        results.map(item => handleData(item))
+        res.json({
+          error_code: 0,
+          msg: '获取成功',
+          data: results,
+          total: results.length
+        })
+      }
+      conn.end()
+    })
+})
+
+// shlef路由API
+app.get('/book/shelf', (req, res) => {
+  res.json({
+    bookList: []
+  })
+})
+
+// voice
+app.get('/voice', (req, res) => {
+  voice(req, res)
+})
+
+const server = app.listen(3000, () => {
+  const host = server.address().address
+  const port = server.address().port
+  console.log('server is listening at http://%s:%s', host, port)
+})