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)); }
以上就是nodejs+angular2实现图片上传功能的示例代码分享的详细内容,更多请关注 第一PHP社区 其它相关文章!