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Node.js-study
/
express_demo.js

var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var multer = require('multer');
var cookieParser = require('cookie-parser');
var fs = require('fs');

var data = `<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    helloworld
</body>

</html>
`;
// app.get('/', function(req, res) {
//     res.send('hello world');
// });
// app.get('/index.html', function(req, res) {
//     console.log(req.get('Cookie'));
//     res.append('a', '1111');
//     // res.type('application/json');
//     // res.json({ "a": "haha", "b": "ahah" });
//     // res.send({ "a": "haha", "b": "ahah" });
//     // res.send(data);
// });
// 创建 application/x-www-form-urlencoded 编码解析
var urlencodedParser = bodyParser.urlencoded({ extended: false });
app.use(express.static('public'));
app.use(multer({ dest: '/tmp/' }).array('image'));
app.use(cookieParser());

//  主页输出 "Hello World"
app.get('/', function(req, res) {
    console.log("主页 GET 请求");
    console.log("Cookies: ", req.cookies)
    res.send('Hello GET');
})

//  POST 请求
app.post('/', function(req, res) {
    console.log("主页 POST 请求");
    res.send('Hello POST');
})

//  /del_user 页面响应
app.get('/del_user', function(req, res) {
    console.log("/del_user 响应 DELETE 请求");
    res.send('删除页面');
})

//  /list_user 页面 GET 请求
app.get('/list_user', function(req, res) {
    console.log("/list_user GET 请求");
    res.send('用户列表页面');
})

// 对页面 abcd, abxcd, ab123cd, 等响应 GET 请求
app.get('/ab*cd', function(req, res) {
    console.log("/ab*cd GET 请求");
    res.send('正则匹配');
})

app.get('/id/:num', function(req, res) { // http://localhost:8081/id/1
    res.send('id');
})

app.get('/index.html', function(req, res) {
    console.log("/ab*cd GET 请求");
    res.sendFile(__dirname + '/' + 'index.html');
})

app.get('/process_get', function(req, res) { // http://127.0.0.1:8081/process_get?first_name=111&last_name=2222

    // 输出 JSON 格式
    var response = {
        "first_name": req.query.first_name,
        "last_name": req.query.last_name
    };
    console.log(response);
    res.end(JSON.stringify(response));
})

app.post('/process_post', urlencodedParser, function(req, res) {

    // 输出 JSON 格式
    var response = {
        "first_name": req.body.first_name,
        "last_name": req.body.last_name
    };
    console.log(response);
    res.end(JSON.stringify(response));
})

app.post('/file_upload', function(req, res) {

    console.log(req.files[0]); // 上传的文件信息

    var des_file = __dirname + "/upload/" + req.files[0].originalname;
    fs.readFile(req.files[0].path, function(err, data) {
        fs.writeFile(des_file, data, function(err) {
            if (err) {
                console.log(err);
            } else {
                response = {
                    message: 'File uploaded successfully',
                    filename: req.files[0].originalname
                };
            }
            console.log(response);
            res.end(JSON.stringify(response));
        });
    });
})

//添加的新用户数据
var user = {
    "user4": {
        "name": "mohit",
        "password": "password4",
        "profession": "teacher",
        "id": 4
    }
}

app.get('/addUser', function(req, res) {
    // 读取已存在的数据
    fs.readFile(__dirname + "/" + "users.json", 'utf8', function(err, data) {
        data = JSON.parse(data);
        data["user4"] = user["user4"];
        console.log(data);
        res.end(JSON.stringify(data));
    });
})

app.get('/:id', function(req, res) {
    // 首先我们读取已存在的用户
    fs.readFile(__dirname + "/" + "users.json", 'utf8', function(err, data) {
        data = JSON.parse(data);
        var user = data["user" + req.params.id]
        console.log(user);
        res.end(JSON.stringify(user));
    });
})

var server = app.listen(8081, function() {
    var host = server.address().address;
    var port = server.address().port;
    console.log("应用实例，访问地址为 http://%s:%s", host, port);
});