node.js 在打字稿中读取和写入文本文件
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Read and write a text file in typescript
提问by william007
How should I read and write a text file from typescript in node.js? I am not sure would read/write a file be sandboxed in node.js, if not, i believe there should be a way in accessing file system.
我应该如何从 node.js 中的 typescript 读取和写入文本文件？我不确定是否会在 node.js 中读取/写入沙盒文件，如果没有，我相信应该有一种访问文件系统的方法。
回答by basarat
believe there should be a way in accessing file system.
相信应该有一种访问文件系统的方法。
Include node.d.tsusing npm i @types/node. And then create a new tsconfig.jsonfile (npx tsc --init) and create a .tsfile as followed:
包括node.d.ts使用npm i @types/node. 然后创建一个新tsconfig.json文件（npx tsc --init）并创建一个.ts文件如下：
import fs from 'fs';
fs.readFileSync('foo.txt','utf8');
You can use other functions in fsas well : https://nodejs.org/api/fs.html
您也可以使用其他功能fs：https: //nodejs.org/api/fs.html
More
更多的
Node quick start : https://basarat.gitbooks.io/typescript/content/docs/node/nodejs.html
节点快速入门：https: //basarat.gitbooks.io/typescript/content/docs/node/nodejs.html
回答by Erik Lopez
First you will need to install nodedefinitions for Typescript. You can find the definitions file here:
首先，您需要为 Typescript安装节点定义。您可以在此处找到定义文件：
https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/node/node.d.ts
https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/node/node.d.ts
Once you've got file, just add the reference to your .tsfile like this:
获得文件后，只需.ts像这样添加对文件的引用：
/// <reference path="path/to/node.d.ts" />
/// <reference path="path/to/node.d.ts" />
Then you can code your typescript class that read/writes, using the Node File System module. Your typescript class myClass.tscan look like this:
然后，您可以使用节点文件系统模块编写可读写的打字稿类。您的打字稿类myClass.ts可能如下所示：
/// <reference path="path/to/node.d.ts" />
class MyClass {
// Here we import the File System module of node
private fs = require('fs');
constructor() { }
createFile() {
this.fs.writeFile('file.txt', 'I am cool!', function(err) {
if (err) {
return console.error(err);
}
console.log("File created!");
});
}
showFile() {
this.fs.readFile('file.txt', function (err, data) {
if (err) {
return console.error(err);
}
console.log("Asynchronous read: " + data.toString());
});
}
}
// Usage
// var obj = new MyClass();
// obj.createFile();
// obj.showFile();
Once you transpile your .tsfile to a javascript (check out hereif you don't know how to do it), you can run your javascript file with node and let the magic work:
一旦您将.ts文件转换为 javascript（如果您不知道如何操作，请查看此处），您可以使用 node 运行您的 javascript 文件并让魔术发挥作用：
> node myClass.js
回答by Ajinkya Kumbhar
import { readFileSync } from 'fs';
const file = readFileSync('./filename.txt', 'utf-8');
This worked for me.
You may need to wrap the second command in any function or you may need to declare inside a class without keyword const.
这对我有用。您可能需要将第二个命令包装在任何函数中，或者您可能需要在没有关键字的类中声明const。
回答by Andrei Bastos
import * as fs from 'fs';
import * as path from 'path';
fs.readFile(path.join(__dirname, "filename.txt"), (err, data) => {
if (err) throw err;
console.log(data);
})
EDIT:
编辑：
consider the project structure:
考虑项目结构：
../readfile/
├── filename.txt
└── src
├── index.js
└── index.ts
consider the index.ts:
考虑index.ts：
import * as fs from 'fs';
import * as path from 'path';
function lookFilesInDirectory(path_directory) {
fs.stat(path_directory, (err, stat) => {
if (!err) {
if (stat.isDirectory()) {
console.log(path_directory)
fs.readdirSync(path_directory).forEach(file => {
console.log(`\t${file}`);
});
console.log();
}
}
});
}
let path_view = './';
lookFilesInDirectory(path_view);
lookFilesInDirectory(path.join(__dirname, path_view));
if you have in the readfile folder and run tsc src/index.ts && node src/index.js, the output will be:
如果你在 readfile 文件夹中运行tsc src/index.ts && node src/index.js，输出将是：
./
filename.txt
src
/home/andrei/scripts/readfile/src/
index.js
index.ts
that is, it depends on where you run the node.
也就是说，这取决于您运行节点的位置。
the __dirnameis directory name of the current module.
该__dirname是当前模块的目录名。
