Nodejs急！！如何用nodejs开发一个图片分享网站

要使用Node.js开发一个图片分享网站，你可以采用以下技术栈：

• 后端：Node.js + Express
• 数据库：MongoDB（通过Mongoose操作）
• 前端：EJS模板引擎 + Bootstrap框架
• 文件存储：AWS S3 或者本地文件系统
• 身份验证：JWT（JSON Web Tokens）

1. 用户注册与登录

首先，我们需要处理用户注册和登录。这里使用JWT来管理用户的登录状态。

// 用户模型 (models/User.js)
const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const UserSchema = new Schema({
    username: { type: String, required: true, unique: true },
    password: { type: String, required: true },
    email: { type: String, required: true, unique: true },
    phoneNumber: { type: String, required: false }
});

module.exports = mongoose.model('User', UserSchema);

// 注册路由 (routes/auth.js)
const express = require('express');
const bcrypt = require('bcryptjs');
const jwt = require('jsonwebtoken');
const User = require('../models/User');

const router = express.Router();

router.post('/register', async (req, res) => {
    const { username, password, email } = req.body;
    const hashedPassword = await bcrypt.hash(password, 10);
    const user = new User({ username, password: hashedPassword, email });
    await user.save();
    res.json({ message: 'User registered successfully' });
});

module.exports = router;

2. 图片上传与显示

接下来，我们创建图片上传的功能，并将图片存储在S3或本地文件系统中。

const multer = require('multer');
const path = require('path');

const storage = multer.diskStorage({
    destination: function (req, file, cb) {
        cb(null, 'uploads/');
    },
    filename: function (req, file, cb) {
        cb(null, Date.now() + path.extname(file.originalname));
    }
});

const upload = multer({ storage: storage });

// 图片上传路由 (routes/images.js)
const express = require('express');
const fs = require('fs');
const Image = require('../models/Image');

const router = express.Router();
const uploadMiddleware = upload.single('image');

router.post('/upload', uploadMiddleware, async (req, res) => {
    const { description } = req.body;
    const imagePath = req.file.path;
    const image = new Image({ description, imagePath });
    await image.save();
    res.json(image);
});

module.exports = router;

3. 评论、点赞与转发

这些功能可以通过简单的API实现，例如：

// 评论路由 (routes/comments.js)
const express = require('express');
const Comment = require('../models/Comment');

const router = express.Router();

router.post('/comment/:imageId', async (req, res) => {
    const { userId, text } = req.body;
    const comment = new Comment({ userId, text, imageId: req.params.imageId });
    await comment.save();
    res.json(comment);
});

module.exports = router;

4. 关注与取消关注

这可以通过简单的关联表来实现：

// 用户模型 (models/User.js)
const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const UserSchema = new Schema({
    // ...
    following: [{ type: Schema.Types.ObjectId, ref: 'User' }]
});

module.exports = mongoose.model('User', UserSchema);

5. 首页图片排序

在查询图片时，可以添加排序逻辑：

// 图片模型 (models/Image.js)
const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const ImageSchema = new Schema({
    description: String,
    imagePath: String,
    createdAt: { type: Date, default: Date.now }
});

ImageSchema.pre('save', function(next) {
    this.createdAt = new Date();
    next();
});

module.exports = mongoose.model('Image', ImageSchema);

// 首页图片路由 (routes/home.js)
const express = require('express');
const Image = require('../models/Image');

const router = express.Router();

router.get('/', async (req, res) => {
    const images = await Image.find().sort('-createdAt').populate('userId');
    res.json(images);
});

module.exports = router;

6. 热门图片页面

热门图片可以根据评论数量和点赞数量进行排序：

// 热门图片路由 (routes/hot.js)
const express = require('express');
const Image = require('../models/Image');

const router = express.Router();

router.get('/', async (req, res) => {
    const images = await Image.find()
        .populate('comments')
        .populate('likes')
        .sort({ comments: -1, likes: -1 });
    res.json(images);
});

module.exports = router;

以上是一个基础的实现思路，你可以根据具体需求进行扩展和优化。