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');
}
);

//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));
}