React+react-dropzone+node.js实现图片上传的示例代码

 "compilerOptions": { "outDir": "./public/", "sourceMap": true, "noImplicitAny": true, "module": "commonjs", "target": "es5", "jsx": "react" , "noImplicitAny": false, "suppressImplicitAnyIndexErrors": true }, "files": [ "./views/home/main.tsx" ], "exclude": [ "node_modules" ] }

 var path = require('path'); var webpack = require('webpack'); var ExtractTextPlugin = require("extract-text-webpack-plugin"); var HtmlWebpackPlugin = require('html-webpack-plugin'); var title = { home: '首页', } module.exports = { entry: { home: [ 'babel-polyfill', './views/home/main.tsx' ], common: ['react','babel-polyfill'] }, output: { path: path.join(__dirname, 'views/wap'), filename: '[name].js', chunkFilename: '[id].build.js?[chunkhash]', publicPath: '/views/wap/', }, module: { loaders: [ { test: /\.tsx?$/, loader: 'ts-loader' }, { test: /\.(less|css)$/, loader: ExtractTextPlugin.extract('style', 'css!less'), }, { test:/\.(js|jsx)?$/, loader:'babel', exclude:/node_modules/, query:{compact:false,presets:['es2015','react','stage-0','stage-1','stage-2']} }, { test: /\.(png|jpg|gif)?$/, loaders: ['url?limit=8192&name=[name]_[sha512:hash:base64:7].[ext]'], }, { test: /\.(eot|woff|ttf|svg)$/, loader: 'file?limit=81920&name=[name]_[sha512:hash:base64:7].[ext]' }, ] }, resolve: { root: ['node_modules'], extensions: ['', '.js', '.jsx', '.html', '.json','.ts', '.tsx'], modulesDirectories: ['node_modules'], alias: {} }, externals: {}, plugins: [ new webpack.DefinePlugin({ 'process.env.NODE_ENV': '"production"' }), new webpack.HotModuleReplacementPlugin(), new ExtractTextPlugin('[name].[contenthash:20].css'), new webpack.optimize.UglifyJsPlugin({ compress: {warnings: false} }), new webpack.optimize.CommonsChunkPlugin('common', 'common.js'), new HtmlWebpackPlugin( { title: "", template: path.join(path.resolve(__dirname),'views/wap/myApp.html'), //模板文件 inject:'body', hash:true,  //为静态资源生成hash值 minify:{  //压缩HTML文件 removeComments:false,  //移除HTML中的注释 collapseWhitespace:false  //删除空白符与换行符 } } ) ] }; 

 import * as Dropzone from 'react-dropzone';  { this.setState({ accepted, rejected });this.drop(accepted[0].preview) }} style={{width:"100%",height:"120px",background:"#f2f2f2","padding-top":'90px',"cursor":"pointer","box-sizing":"content-box"}} > 

 drop(src : any) : any{ const that = this; let img = src; let image = new Image(); image.crossOrigin = 'Anonymous'; image.src = img; image.onload = function(){ let base64 = that.getBase64Image(image); that.upLoadImg({imgData:base64}) } }

 getBase64Image(img :any) : string { let canvas = document.createElement("canvas"); canvas.width = img.width; canvas.height = img.height; let ctx = canvas.getContext("2d"); ctx.drawImage(img, 0, 0, img.width, img.height); let ext = img.src.substring(img.src.lastIndexOf(".")+1).toLowerCase(); let dataURL = canvas.toDataURL("image/"+ext); return dataURL; } 

 async upLoadImg(params : object) : Promise{ let res = await axios.post('http://localhost:3000/upLoadImg',params); }

 var express = require('express'); var router = express.Router(); var rf = require('fs'); var SetImg = require('./controller/uploadImg'); var setImg = new SetImg; router.post('/upLoadImg',setImg.setUploadImg); module.exports = router;

 var rf = require('fs'); class SetImg { setUploadImg(req, res, next) { let imgData = req.body.imgData; let base64Data = imgData.replace(/^data:image\/\w+;base64,/, ""); let dataBuffer = new Buffer(base64Data, 'base64'); let timer = Number( new Date() ); rf.writeFile("views/images/artCover"+timer+".png-600",dataBuffer, function(err) { if(err) { res.json({"code":400,"verson":false,"msg":err}); }else { res.json({"code":100,"verson":true,"url":"views/src/common/images/artCover/"+timer+".png-600"}); } }); } } module.exports = SetImg;

 import * as React from 'react'; import * as ReactDom  from 'react-dom'; import * as Dropzone from 'react-dropzone'; import * as axios from 'axios'; import './main.less'; declare var document; declare var Image; class ImgUpload extends React.Component { constructor(){ super() this.state = { accepted: [], rejected: [] } } public drop(src : any) : any{ const that = this; let img = src; let image = new Image(); image.crossOrigin = 'Anonymous'; image.src = img; image.onload = function(){ let base64 = that.getBase64Image(image); console.log(base64) that.upLoadImg({imgData:base64}) } } //转base64 public getBase64Image(img :any) : string { let canvas = document.createElement("canvas"); canvas.width = img.width; canvas.height = img.height; let ctx = canvas.getContext("2d"); ctx.drawImage(img, 0, 0, img.width, img.height); let ext = img.src.substring(img.src.lastIndexOf(".")+1).toLowerCase(); let dataURL = canvas.toDataURL("image/"+ext); return dataURL; } public async upLoadImg(params : object) : Promise{ let res = await axios.post('http://localhost:3000/upLoadImg',params); } render(){ const that = this; let imgs; if(this.state.accepted.length > 0){ imgs = ( 
 {this.state.accepted.map( (f) => { return  })} 
 ) } return ( 
 
  { console.log(accepted);console.log(rejected);this.setState({ accepted, rejected });this.drop(accepted[0].preview) }} style={{width:"100%",height:"120px",background:"#f2f2f2","padding-top":'90px',"cursor":"pointer","box-sizing":"content-box"}} > 
请添加主题图片
{imgs} 
 ) } } ReactDom.render( , document.getElementById('app') )