如何通过节点服务器将JSON对象写入文件? [英] How do I write a JSON object to file via Node server?

问题描述

我在前端使用Angular，并尝试将JSON对象写入与index.html相同目录中的名为"post.json"的文件.我可以使用PHP使其工作，但我想知道如何使用Node.js.我在线上看了很多帖子，但也许我不了解http POST的实际工作原理以及服务器需要从Angular应用程序写入文件的哪些设置.如何从Angular应用程序写入文件以及节点服务器需要哪些设置?

I am using Angular for the front-end and attempting to write a JSON object to a file called 'post.json' in the same directory as index.html. I can make it work using PHP but I want to know how do it with Node.js. I have looked at a lot of posts online but maybe I am not understanding how http POST actually works and what settings the server needs to write to file from an Angular app. How do I write to file from the Angular app and what settings does the node server need?

Angular文件中的代码:

Code in the Angular file:

// Add a Item to the list
$scope.addItem = function () {

    $scope.items.push({
        amount: $scope.itemAmount,
        name: $scope.itemName
    });

    var data = JSON.stringify($scope.items);

    $http({
        url: 'post.json',
        method: "POST",
        data: data,
        header: 'Content-Type: application/json'
    })
    .then(function(response) {
        console.log(response);
    }, 
    function(response) {
        console.log(response);
    });

    // Clear input fields after push
    $scope.itemAmount = "";
    $scope.itemName = "";
};

这是节点服务器文件:

var connect = require('connect');
var serveStatic = require('serve-static');
connect().use(serveStatic(__dirname)).listen(8080);

fs = require('fs');
fs.open('post.json', 'w', function(err, fd){
    if(err){
        return console.error(err);
    }
    console.log("successful write");
});

然后我收到此错误:

推荐答案

以下是使用 Express.js 框架(以防您不限于连接").

Here is example of Node.js server using Express.js framework (in case you are not limited to 'connect').

var express = require('express');
var app = express();
var fs = require('fs');

app.get('/', function (req, res) {
  res.send('Hello World!');
});

app.post('/', function (req, res) {
  fs.writeFile(__dirname+"/post.json", req.body, function(err) {
    if(err) {
       return console.log(err);
    }
    res.send('The file was saved!');
  }); 
});

app.listen(8080, function () {
  console.log('Example app listening on port 8080!');
});

在您的角度控制器中，明确指定网址:

In your angular controller specify explicitly the url:

 $http({
    url: 'http://localhost:8080',
    method: "POST",
    data: data,
    header: 'Content-Type: application/json'
})

为简化起见，删除了body-parser中间件.

Removed body-parser middleware for simplification.

这篇关于如何通过节点服务器将JSON对象写入文件?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！