在使用angular2进行图片上传的时候，遇到了各种各样的问题。在多番尝试之后最终成功上传图片，下面将我的方法分享给大家：
nodejs 后台代码
var express = require("express"); //网络请求模块 var request = require("request"); //引入nodejs文件系统模块 const fs = require('fs'); //引入body-parser //包含在请求正文中提交的键/值对数据。 //默认情况下，它是未定义的，并在使用body-parser中间件时填充。 var bodyParser = require('body-parser'); var app = express(); //解析 application/x-www-form-urlencoded，limit:'20mb'用于设置请求的大小 //解决nodejs Error: request entity too large问题 app.use(bodyParser.urlencoded({ limit:'20mb',extended: true })); //设置跨域访问 app.all('*', function(req, res, next) { res.header("Access-Control-Allow-Origin", "*"); res.header("Access-Control-Allow-Headers", "X-Requested-With"); res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS"); res.header("Content-Type", "application/json;charset=utf-8"); next(); }); //上传图片 app.post('/upload',function(req,res){ var imgData = req.body.url; var base64Data = imgData.replace(/^data:image\/\w+;base64,/, ""); var dataBuffer = new Buffer(base64Data, 'base64'); fs.writeFile("image.png", dataBuffer, function(err) { if(err){ res.send(err); }else{ res.send("保存成功！"); } }); }) var server = app.listen(4444, function() { console.log('监听端口 4444'); });
angular2前台代码
//上传图片 /* * let data = { * size: '125422', * type: 'image/jpeg', * name: 'test.jpg', * url: base64 * }; *获取图片的base64码可以通过FileReader获取 */ uploadImage(data) { return new Promise((resolve, reject) => { let headers = new Headers({ 'Content-Type': 'application/x-www-form-urlencoded' }); let options = new RequestOptions({ headers: headers }); this.http.post("http://localhost:4444/upload", this.toQueryString(data),options) .map(res => res.json()) .subscribe(data => { resolve(data), error => { reject(error) } }) }) } // JSON参数序列化 private toQueryString(obj) { let result = []; for (let key in obj) { key = encodeURIComponent(key); let values = obj[key]; if (values && values.constructor == Array) { let queryValues = []; for (let i = 0, len = values.length, value; i < len; i++) { value = values[i]; queryValues.push(this.toQueryPair(key, value)); } result = result.concat(queryValues); } else { result.push(this.toQueryPair(key, values)); } } return result.join('&'); } private toQueryPair(key, value) { if (typeof value == 'undefined') { return key; } return key + '=' + encodeURIComponent(value === null ? '' : String(value)); }