腾讯云对象储存cos的配置方法简单说明

download_url?imageView2/w/h/format/q/rq/lq
http://examples-1251000004.picsh.myqcloud.com/sample.jpeg?imageView2/1/w/400/h/600/q/85
http://examples-1251000004.picsh.myqcloud.com/sample.jpeg?imageView2/2/w/400/h/600/q/85!
http://examples-1251000004.picsh.myqcloud.com/sample.jpeg?imageView2/3/w/400/format/png

//app.js
const Koa = require('koa')
const multer = require('koa-multer')
const Router = require('koa-router')
const views = require('koa-views')
const path = require('path')
const fs = require('fs')
const COS = require('cos-nodejs-sdk-v5')
const app = new Koa()

//加载模板引擎
app.use(views(path.join(__dirname, 'view'), {
  extension: 'ejs'
}))

const router = new Router()
router.get('/', async (ctx, next) => {
  let title = 'hello koa2'
  await ctx.render('index', {
    title
  })
})

//文件上传
//配置
var storage = multer.diskStorage({
  //文件保存路径
  destination: function (req, file, cb) {
    cb(null, 'public/uploads/')
  },
  //修改文件名称
  filename: function (req, file, cb) {
    var fileFormat = (file.originalname).split("."); //以点分割成数组，数组的最后一项就是后缀名
    cb(null, fileFormat[0] + "." + fileFormat[fileFormat.length - 1]);
  }
})
//加载配置
var upload = multer({
  storage: storage
});

var cos = new COS({
  AppId: '1258336067',
  SecretId: 'AKID89vfPu7CzhGzVVSnBKFySkvwkLkyAuc6',
  SecretKey: 'SgfS1MSK4ZrwnPBhz70e3JLC0ay85nHW',
});

var tengxun_cos = {
  Bucket: '564297479-1258336067',
  Region: 'ap-hongkong',
}

//路由
router.post('/upload', upload.single('file'), async (ctx, next) => {
  // 文件路径
  var filePath = ctx.req.file.path
  // 文件类型
  var temp = ctx.req.file.filename.split('.');
  var fileType = temp[temp.length - 1];
  var lastName = '.' + fileType;
  // 构建图片名
  var fileName = temp[0] + lastName;
  //文件重命名 修改文件名称，可更改文件的存放路径。
  fs.rename(filePath, fileName, (err) => {
    if (err) {
      console.log('文件写入失败')
    } else {
      console.log(fileName)
      // let pathName = 'file-' + parseInt(1000000 * (Math.random() + 1)) + '/' + fileName // 随机文件夹名以避免同名文件覆盖
      var localFile = './' + fileName;
      var key = fileName;
      // 腾讯云 文件上传
      var params = {
        Bucket: tengxun_cos.Bucket,
        /* 必须 */
        Region: tengxun_cos.Region,
        /* 必须 */
        Key: key,
        /* 必须 */
        FilePath: localFile
      }
      cos.sliceUploadFile(params, function (err, data) {
        if (err) {
          ctx.body = {
            status: '0',
            msg: '上传失败',
            error: JSON.stringify(err)
          }
        } else {
          var imageSrc = `https://564297479-1258336067.cos.ap-hongkong.myqcloud.com/${data.Key}`
          ctx.body = {
            status: '1',
            msg: '上传成功',
            imageUrl: imageSrc
          }
          console.log('上传成功')
        }
      })
    }
  })


})

app.use(router.routes(), router.allowedMethods())
app.listen(5555, () => {
  console.log('Server is running at port 5555...')
})

//server.js
//node.js 作为服务器端

var express = require('express'); //引入框架
var app = express();

//静态资源站
app.use(express.static('public'));

//__dirname 表示当前的文件目录下, 这个server.js文件在哪就代表在那个路径
app.get('/index.html', function (req, res) {
    res.sendFile(__dirname + '/' + 'index.html'); //注意dirname这个变量前面有两个下划线
});

app.get('/process_get', function (req, res) {
    //输出json格式
    var response = {
        'xuhengfeng1': req.query.first_name,
        'xuhengfeng2': req.query.last_name
    };
    console.log(response);
    res.end(JSON.stringify(response));
})

var fs = require('fs');
var COS = require('cos-nodejs-sdk-v5');

var cos = new COS({
    AppId: '1258336067',
    SecretId: 'AKID89vfPu7CzhGzVVSnBKFySkvwkLkyAuc6',
    SecretKey: 'SgfS1MSK4ZrwnPBhz70e3JLC0ay85nHW',
});

var tengxun_cos = {
    Bucket: '564297479-1258336067',
    Region: 'ap-hongkong',
}
var multer = require('multer')
var upload = multer({
    dest: './tmp/'
})
// 图片上传
app.all('/api/tengxun/upload2', upload.single('file'), function (req, res, next) {
    // 文件路径
    var filePath = './' + req.file.path;
    // 文件类型
    var temp = req.file.originalname.split('.');
    var fileType = temp[temp.length - 1];
    var lastName = '.' + fileType;


    // 构建图片名
    var fileName = Date.now() + lastName;
    // 图片重命名
    fs.rename(filePath, fileName, (err) => {
        if (err) {
            res.end(JSON.stringify({
                status: '102',
                msg: '文件写入失败'
            }));
        } else {
            var localFile = './' + fileName;
            var key = fileName;

            // 腾讯云 文件上传
            var params = {
                Bucket: tengxun_cos.Bucket,
                /* 必须 */
                Region: tengxun_cos.Region,
                /* 必须 */
                Key: key,
                /* 必须 */
                FilePath: localFile,
                /* 必须 */
            }
            cos.sliceUploadFile(params, function (err, data) {
                if (err) {
                    fs.unlinkSync(localFile);
                    res.end(JSON.stringify({
                        status: '101',
                        msg: '上传失败',
                        error: JSON.stringify(err)
                    }));
                } else {
                    fs.unlinkSync(localFile);
                    var imageSrc = 'https://564297479-1258336067.cos.ap-hongkong.myqcloud.com/' + data.Key;
                    res.end(JSON.stringify({
                        status: '100',
                        msg: '上传成功',
                        imageUrl: imageSrc
                    }));
                }
            });
        }
    });
})

var server = app.listen(3000, function () {
    var host = server.address().address;
    var port = server.address().port;
    console.log('应用实例,访问地址为http://%s:%s', host, port);
})