我对在Node.js中读取文件感到困惑。

fs.open('./start.html', 'r', function(err, fileToRead){
    if (!err){
        fs.readFile(fileToRead, {encoding: 'utf-8'}, function(err,data){
            if (!err){
            console.log('received data: ' + data);
            response.writeHead(200, {'Content-Type': 'text/html'});
            response.write(data);
            response.end();
            }else{
                console.log(err);
            }
        });
    }else{
        console.log(err);
    }
});

文件start.html与试图打开和读取它的文件在同一个目录中。

然而,在控制台,我得到:

{[错误:ENOENT,打开'./start.html'] errno: 34,代码:'ENOENT',路径:'./start.html'}

什么好主意吗?


当前回答

如果您想知道如何读取目录中的文件,并对其进行操作,请参阅这里。这也向您展示了如何通过power shell运行命令。这是在TypeScript中!我在这方面遇到了麻烦,所以我希望有一天这能帮助到别人。这为我做的是webpack我所有的.ts文件在我的每个目录在一个特定的文件夹,为部署做好准备。希望你能派上用场!

import * as fs from 'fs';
let path = require('path');
let pathDir = '/path/to/myFolder';
const execSync = require('child_process').execSync;

let readInsideSrc = (error: any, files: any, fromPath: any) => {
    if (error) {
        console.error('Could not list the directory.', error);
        process.exit(1);
    }
    
    files.forEach((file: any, index: any) => {
        if (file.endsWith('.ts')) {
            //set the path and read the webpack.config.js file as text, replace path
            let config = fs.readFileSync('myFile.js', 'utf8');
            let fileName = file.replace('.ts', '');
            let replacedConfig = config.replace(/__placeholder/g, fileName);

            //write the changes to the file
            fs.writeFileSync('myFile.js', replacedConfig);

            //run the commands wanted
            const output = execSync('npm run scriptName', { encoding: 'utf-8' });
            console.log('OUTPUT:\n', output);

            //rewrite the original file back
            fs.writeFileSync('myFile.js', config);
        }
    });
};

// loop through all files in 'path'
let passToTest = (error: any, files: any) => {
    if (error) {
        console.error('Could not list the directory.', error);
        process.exit(1);
    }

    files.forEach(function (file: any, index: any) {
        let fromPath = path.join(pathDir, file);
        fs.stat(fromPath, function (error2: any, stat: any) {
            if (error2) {
                console.error('Error stating file.', error2);
                return;
            }

            if (stat.isDirectory()) {
                fs.readdir(fromPath, (error3: any, files1: any) => {
                    readInsideSrc(error3, files1, fromPath);
                });
            } else if (stat.isFile()) {
                //do nothing yet
            }

        });
    });
};

//run the bootstrap
fs.readdir(pathDir, passToTest);

其他回答

使用http模块从服务器读取html文件。这是从服务器读取文件的一种方法。如果你想让它在控制台删除http模块声明。

var http = require('http'); var fs = require('fs'); var server = http.createServer(function(req, res) { fs.readFile('HTMLPage1.html', function(err, data) { if (!err) { res.writeHead(200, { 'Content-Type': 'text/html' }); res.write(data); res.end(); } else { console.log('error'); } }); }); server.listen(8000, function(req, res) { console.log('server listening to localhost 8000'); }); <html> <body> <h1>My Header</h1> <p>My paragraph.</p> </body> </html>

运行这段代码,它将从文件中获取数据并显示在控制台

function fileread(filename)
{            
   var contents= fs.readFileSync(filename);
   return contents;
}        
var fs =require("fs");  // file system        
var data= fileread("abc.txt");
//module.exports.say =say;
//data.say();
console.log(data.toString());

如果您想知道如何读取目录中的文件,并对其进行操作,请参阅这里。这也向您展示了如何通过power shell运行命令。这是在TypeScript中!我在这方面遇到了麻烦,所以我希望有一天这能帮助到别人。这为我做的是webpack我所有的.ts文件在我的每个目录在一个特定的文件夹,为部署做好准备。希望你能派上用场!

import * as fs from 'fs';
let path = require('path');
let pathDir = '/path/to/myFolder';
const execSync = require('child_process').execSync;

let readInsideSrc = (error: any, files: any, fromPath: any) => {
    if (error) {
        console.error('Could not list the directory.', error);
        process.exit(1);
    }
    
    files.forEach((file: any, index: any) => {
        if (file.endsWith('.ts')) {
            //set the path and read the webpack.config.js file as text, replace path
            let config = fs.readFileSync('myFile.js', 'utf8');
            let fileName = file.replace('.ts', '');
            let replacedConfig = config.replace(/__placeholder/g, fileName);

            //write the changes to the file
            fs.writeFileSync('myFile.js', replacedConfig);

            //run the commands wanted
            const output = execSync('npm run scriptName', { encoding: 'utf-8' });
            console.log('OUTPUT:\n', output);

            //rewrite the original file back
            fs.writeFileSync('myFile.js', config);
        }
    });
};

// loop through all files in 'path'
let passToTest = (error: any, files: any) => {
    if (error) {
        console.error('Could not list the directory.', error);
        process.exit(1);
    }

    files.forEach(function (file: any, index: any) {
        let fromPath = path.join(pathDir, file);
        fs.stat(fromPath, function (error2: any, stat: any) {
            if (error2) {
                console.error('Error stating file.', error2);
                return;
            }

            if (stat.isDirectory()) {
                fs.readdir(fromPath, (error3: any, files1: any) => {
                    readInsideSrc(error3, files1, fromPath);
                });
            } else if (stat.isFile()) {
                //do nothing yet
            }

        });
    });
};

//run the bootstrap
fs.readdir(pathDir, passToTest);

使用路径。加入(__dirname ' / start.html ');

var fs = require('fs'),
    path = require('path'),    
    filePath = path.join(__dirname, 'start.html');

fs.readFile(filePath, {encoding: 'utf-8'}, function(err,data){
    if (!err) {
        console.log('received data: ' + data);
        response.writeHead(200, {'Content-Type': 'text/html'});
        response.write(data);
        response.end();
    } else {
        console.log(err);
    }
});

感谢dc5。

1). ASync:

var fs = require('fs');
fs.readFile(process.cwd()+"\\text.txt", function(err,data)
            {
                if(err)
                    console.log(err)
                else
                    console.log(data.toString());
            });

2).同步:

var fs = require('fs');
var path = process.cwd();
var buffer = fs.readFileSync(path + "\\text.txt");
console.log(buffer.toString());