Question

我无法在本地主机上启动简单的Node.js Express.js服务器。

我尝试过

节点Express.js

无济于事。

我收到此错误

$ node Express.js
events.js:183
      throw er; // Unhandled 'error' event
      ^

Error: listen EACCES 127.0.0.1
    at Object._errnoException (util.js:992:11)

我的代码是

    // express.js

const mysql = require('mysql');
const express = require('express');
const router = express.Router();
const bodyParser = require('body-parser');

const hostname = '127.0.0.1';
const port = '8080';

const app = express();

app.set('port', process.env.PORT || 8080);

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

const con = mysql.createConnection({
    host: 'localhost',
    user: 'bojan',
    password: 'Hamurabi77',
    database: 'user'
});

con.connect((err) => {
    if (err) throw err;
    console.log('Connected!');
});

const createDatabase = 'CREATE DATABASE user';
con.query(createDatabase, (err, result, fields) => {
    if (err) throw err;
    console.log('Created!');
});

const createTable = 'CREATE TABLE user (id AUTO_INCREMENT PRIMARY_KEY something VARCHAR(255))';
con.query(createTable, (err, result, fields) => {
    if (err) throw err;
    console.log('Created!');
});

app.get('/users', (req, res, end) => {
    const selectUsers = `SELECT * FROM user`;
    con.query(selectUsers, (err, result, fields) => {
        if (err) throw err;
        console.log('Selected!');
    });
    res.json();
    res.send('Selected!');
    res.end();
});

app.get('/users/:id', (req, res, end) => {
    const selectUserByID = `SELECT * FROM user WHERE id=${req.id}`;
    con.query(selectUserByID, (err, result, fields) => {
        if (err) throw err;
        console.log('Selected by ID!');
    });
    res.json();
    res.send('Selected by ID!');
    res.end();
});

app.post('/user/insert', (req, res, end) => {
    const insertUser = `INSERT INTO user SET (something) VALUES (${req.something})`;
    con.query(insertUser, (err, result, fields) => {
        if (err) throw err;
        console.log('Inserted!');
    });
    res.json();
    res.send('Inserted!');
    res.end();
});

app.post('/user/update/:id', (req, res, end) => {
    const updateUserByID = `UPDATE user SET (something) VALUES (${req.something}) WHERE id=${req.id}`;
    con.query(updateUserByID, (err, result, fields) => {
        if (err) throw err;
        console.log('Updated!');
    });
    res.json();
    res.send('Updated!');
    res.end();
});

app.post('/user/delete/:id', (req, res, end) => {
    const deleteUserByID = `DELETE * FROM user WHERE id=${req.id}`;
    con.query(deleteUserByID, (err, result, fields) => {
        if (err) throw err;
        console.log('Deleted!');
    });
    res.json();
    res.send('Deleted!');
    res.end();
});

router(app);

app.listen(hostname, port, () => {
    console.log(`Connection running at https://${hostname}:${port}!`);
});

我的代码有什么问题？任何建议将不胜感激。我希望它可以在https://localhost:8080

上使用

Answer 1

可能是您在本地计算机上创建服务器时遇到了问题。

const http = require('http');

router(app);
const server = http.createServer(app);

server.listen(3090, () => {
    console.log('Server is on port 3090');
});

您可以尝试一下吗？如果有任何错误，请对其进行评论。

Answer 2

无需在此处提供主机名，请尝试以下代码：

 public class CustomTitleBarWindow: Window
    {
        public static readonly DependencyProperty ShowSystemMenuCommandProperty = DependencyProperty.Register("ShowSystemMenuCommand", typeof(ICommand), typeof(CustomTitleBarWindow), new PropertyMetadata(null));
        public ICommand ShowSystemMenuCommand
        {
            get => (ICommand)GetValue(ShowSystemMenuCommandProperty);
            set => SetValue(ShowSystemMenuCommandProperty, value);
        }

        public static readonly DependencyProperty MinimizeCommandProperty = DependencyProperty.Register("MinimizeCommand", typeof(ICommand), typeof(CustomTitleBarWindow), new PropertyMetadata(null));
        public ICommand MinimizeCommand
        {
            get => (ICommand)GetValue(MinimizeCommandProperty);
            set => SetValue(MinimizeCommandProperty, value);
        }

        public static readonly DependencyProperty MaximizeCommandProperty = DependencyProperty.Register("MaximizeCommand", typeof(ICommand), typeof(CustomTitleBarWindow), new PropertyMetadata(null));
        public ICommand MaximizeCommand
        {
            get => (ICommand)GetValue(MaximizeCommandProperty);
            set => SetValue(MaximizeCommandProperty, value);
        }

        public static readonly DependencyProperty CloseCommandProperty = DependencyProperty.Register("CloseCommand", typeof(ICommand), typeof(CustomTitleBarWindow), new PropertyMetadata(null));
        public ICommand CloseCommand
        {
            get => (ICommand)GetValue(CloseCommandProperty);
            set => SetValue(CloseCommandProperty, value);
        }
    }

Answer 3

尝试一下，先输入端口名，然后输入主机名

app.listen(port, hostname, () => {
    console.log(`Connection running at https://${hostname}:${port}!`);
});

如何启动简单的Node.js Express.js服务器？

3 个答案: