如何从Node.js中的HTTP post方法中提取表单数据(form[method="post"])和文件上传?
我看了文件，谷歌了一下，什么都没找到。
function (request, response) {
//request.post????
}
有图书馆或黑客吗?
当前回答
我找到了一个视频，它解释了如何实现这一点: https://www.youtube.com/watch?v=nuw48-u3Yrg
它使用默认的“http”模块以及“querystring”和“stringbuilder”模块。应用程序从网页中获取两个数字(使用两个文本框)，并在提交时返回这两个数字的和(以及在文本框中持久化的值)。这是我能在其他地方找到的最好的例子。
相关源代码:
var http = require("http");
var qs = require("querystring");
var StringBuilder = require("stringbuilder");
var port = 9000;
function getCalcHtml(req, resp, data) {
var sb = new StringBuilder({ newline: "\r\n" });
sb.appendLine("<html>");
sb.appendLine(" <body>");
sb.appendLine(" <form method='post'>");
sb.appendLine(" <table>");
sb.appendLine(" <tr>");
sb.appendLine(" <td>Enter First No: </td>");
if (data && data.txtFirstNo) {
sb.appendLine(" <td><input type='text' id='txtFirstNo' name='txtFirstNo' value='{0}'/></td>", data.txtFirstNo);
}
else {
sb.appendLine(" <td><input type='text' id='txtFirstNo' name='txtFirstNo' /></td>");
}
sb.appendLine(" </tr>");
sb.appendLine(" <tr>");
sb.appendLine(" <td>Enter Second No: </td>");
if (data && data.txtSecondNo) {
sb.appendLine(" <td><input type='text' id='txtSecondNo' name='txtSecondNo' value='{0}'/></td>", data.txtSecondNo);
}
else {
sb.appendLine(" <td><input type='text' id='txtSecondNo' name='txtSecondNo' /></td>");
}
sb.appendLine(" </tr>");
sb.appendLine(" <tr>");
sb.appendLine(" <td><input type='submit' value='Calculate' /></td>");
sb.appendLine(" </tr>");
if (data && data.txtFirstNo && data.txtSecondNo) {
var sum = parseInt(data.txtFirstNo) + parseInt(data.txtSecondNo);
sb.appendLine(" <tr>");
sb.appendLine(" <td>Sum: {0}</td>", sum);
sb.appendLine(" </tr>");
}
sb.appendLine(" </table>");
sb.appendLine(" </form>")
sb.appendLine(" </body>");
sb.appendLine("</html>");
sb.build(function (err, result) {
resp.write(result);
resp.end();
});
}
function getCalcForm(req, resp, data) {
resp.writeHead(200, { "Content-Type": "text/html" });
getCalcHtml(req, resp, data);
}
function getHome(req, resp) {
resp.writeHead(200, { "Content-Type": "text/html" });
resp.write("<html><html><head><title>Home</title></head><body>Want to some calculation? Click <a href='/calc'>here</a></body></html>");
resp.end();
}
function get404(req, resp) {
resp.writeHead(404, "Resource Not Found", { "Content-Type": "text/html" });
resp.write("<html><html><head><title>404</title></head><body>404: Resource not found. Go to <a href='/'>Home</a></body></html>");
resp.end();
}
function get405(req, resp) {
resp.writeHead(405, "Method not supported", { "Content-Type": "text/html" });
resp.write("<html><html><head><title>405</title></head><body>405: Method not supported</body></html>");
resp.end();
}
http.createServer(function (req, resp) {
switch (req.method) {
case "GET":
if (req.url === "/") {
getHome(req, resp);
}
else if (req.url === "/calc") {
getCalcForm(req, resp);
}
else {
get404(req, resp);
}
break;
case "POST":
if (req.url === "/calc") {
var reqBody = '';
req.on('data', function (data) {
reqBody += data;
if (reqBody.length > 1e7) { //10MB
resp.writeHead(413, 'Request Entity Too Large', { 'Content-Type': 'text/html' });
resp.end('<!doctype html><html><head><title>413</title></head><body>413: Request Entity Too Large</body></html>');
}
});
req.on('end', function () {
var formData = qs.parse(reqBody);
getCalcForm(req, resp, formData);
});
}
else {
get404(req, resp);
}
break;
default:
get405(req, resp);
break;
}
}).listen(port);
其他回答
如果你不想使用整个框架，如Express，但你也需要不同种类的表单，包括上传，那么formaline可能是一个不错的选择。
它列在Node.js模块中
您可以使用express中间件，该中间件现在内置了体解析器。这意味着你所需要做的就是:
import express from 'express'
const app = express()
app.use(express.json())
app.post('/thing', (req, res) => {
console.log(req.body) // <-- this will access the body of the post
res.sendStatus(200)
})
该代码示例是带有Express 4.16.x的ES6
参考:https://nodejs.org/en/docs/guides/anatomy-of-an-http-transaction/
let body = [];
request.on('data', (chunk) => {
body.push(chunk);
}).on('end', () => {
body = Buffer.concat(body).toString();
// at this point, `body` has the entire request body stored in it as a string
});
如果你从POST接收到JSON格式的数据。：
import http from 'http';
const hostname = '127.0.0.1';
const port = 3000;
const httpServer: http.Server = http.createServer((req: http.IncomingMessage, res:
http.ServerResponse) => {
if(req.method === 'POST') {
let body: string = '';
req.on('data',(chunck) => {
body += chunck;
});
req.on('end', () => {
const body = JSON.parse(body);
res.statusCode = 200;
res.end('OK post');
});
}
});
httpServer.listen(port, hostname, () => {
console.info(`Server started at port ${port}`);
})
如果你更喜欢使用纯Node.js，那么你可以提取POST数据，如下所示:
// Dependencies const StringDecoder = require('string_decoder').StringDecoder; const http = require('http'); // Instantiate the HTTP server. const httpServer = http.createServer((request, response) => { // Get the payload, if any. const decoder = new StringDecoder('utf-8'); let payload = ''; request.on('data', (data) => { payload += decoder.write(data); }); request.on('end', () => { payload += decoder.end(); // Parse payload to object. payload = JSON.parse(payload); // Do smoething with the payload.... }); }; // Start the HTTP server. const port = 3000; httpServer.listen(port, () => { console.log(`The server is listening on port ${port}`); });
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