Node.js リクエスト処理
ルーティング
const http = require(‘http’);
const fs = require(‘fs’);
const ejs = require(‘ejs’);
const url = require(‘url’);
var server = http.createServer(setResponse);
server.listen(3000);
function setResponse(request, response){
const page = fs.readFileSync(‘./index.ejs’, ‘utf8’);
const css = fs.readFileSync(‘./style.css’, ‘utf8’);
URLをパース
let url_parts = url.parse(request.url);
URL判定
switch (url_parts.pathname){
case ‘/’:
let content = ejs.render(page, {
title: ‘Node.js’,
message: ‘JavaScript’,
});
response.writeHead(200, {‘Content-Type’: ‘text/html’});
response.write(content);
response.end();
break;
case ‘/style.css’:
response.writeHead(200, {‘Content-Type’: ‘text/css’});
response.write(css);
response.end();
break;
default:
response.writeHead(200, {‘Content-Type’: ‘text/plain’});
response.write(‘no page…’);
response.end();
break;
}
}
GETパラメータ取得
var server = http.createServer(setResponse);
server.listen(3000);
function setResponse(request, response){
クエリパラメータを含めてURLをパース
let url_parts = url.parse(request.url, true);
クエリパラメータ取得
let query = url_parts.query;
console.log(query);
http://localhost:3000/?title=aaa&message=bbbb
[Object: null prototype] { title: ‘aaa’, message: ‘bbbb’ }
let content = ejs.render(page, {
title: query.title,
message: query.message,
});
response.writeHead(200, {‘Content-Type’: ‘text/html’});
response.write(content);
response.end();
}
POSTパラメータ取得
クライアント
<html lang=”ja”>
<body>
<form method=”POST” action=”/post“>
<input type=”text” name=”message“>
<input type=”submit”>
</form>
</body>
</html>
サーバ
const querystring = require(‘querystring’);
var server = http.createServer(setResponse);
server.listen(3000);
function setResponse(request, response){
const page = fs.readFileSync(‘./index.ejs’, ‘utf8’);
let url_parts = url.parse(request.url, true);
switch (url_parts.pathname){
case ‘/’:
～
break;
case ‘/post’:
if (request.method == ‘POST’){
let body = ”;
リクエストデータ取得イベント(複数回発生する)
request.on(‘data’, (data) => {
body += data;
});
リクエストデータ終了イベント
request.on(‘end’, () => {
let postData = querystring.parse(body);
console.log(body);
message: ‘node.js’
console.log(postData);
[Object: null prototype] { message: ‘node.js’ }
let content = ejs.render(page, {
message: `POSTデータ：${postData.message}`,
});
response.writeHead(200, {‘Content-Type’: ‘text/html’});
response.write(content);
response.end();
});
}
break;
default:
～
}
}
