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
您需要使用请求以块的形式接收POST数据。On ('data'， function(chunk){…})
const http = require('http');
http.createServer((req, res) => {
if (req.method == 'POST') {
whole = ''
req.on('data', (chunk) => {
# consider adding size limit here
whole += chunk.toString()
})
req.on('end', () => {
console.log(whole)
res.writeHead(200, 'OK', {'Content-Type': 'text/html'})
res.end('Data received.')
})
}
}).listen(8080)
你应该考虑像jh建议的那样在指定位置增加一个尺寸限制。
其他回答
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);
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
要详细说明使用URLSearchParams:
Node.js知识:如何读取POST数据? 类:URLSearchParams .js文档 MDN: URLSearchParams
const http = require('http');
const POST_HTML =
'<html><head><title>Post Example</title></head>' +
'<body>' +
'<form method="post">' +
'Input 1: <input name="input1"><br>' +
'Input 2: <input name="input2"><br>' +
'Input 1: <input name="input1"><br>' +
'<input type="submit">' +
'</form>' +
'</body></html>';
const FORM_DATA = 'application/x-www-form-urlencoded';
function processFormData(body) {
const params = new URLSearchParams(body);
for ([name, value] of params.entries()) console.log(`${name}: ${value}`);
}
// req: http.IncomingMessage
// res: http.ServerResponse
//
function requestListener(req, res) {
const contentType = req.headers['content-type'];
let body = '';
const append = (chunk) => {
body += chunk;
};
const complete = () => {
if (contentType === FORM_DATA) processFormData(body);
res.writeHead(200);
res.end(POST_HTML);
};
req.on('data', append);
req.on('end', complete);
}
http.createServer(requestListener).listen(8080);
$ node index.js
input1: one
input2: two
input1: three
如果你使用Express (Node.js的高性能、高级web开发)，你可以这样做:
HTML:
<form method="post" action="/">
<input type="text" name="user[name]">
<input type="text" name="user[email]">
<input type="submit" value="Submit">
</form>
API客户端:
fetch('/', {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({
user: {
name: "John",
email: "john@example.com"
}
})
});
Node.js:(自Express v4.16.0起)
// Parse URL-encoded bodies (as sent by HTML forms)
app.use(express.urlencoded());
// Parse JSON bodies (as sent by API clients)
app.use(express.json());
// Access the parse results as request.body
app.post('/', function(request, response){
console.log(request.body.user.name);
console.log(request.body.user.email);
});
Node.js:(对于Express <4.16.0)
const bodyParser = require("body-parser");
/** bodyParser.urlencoded(options)
* Parses the text as URL encoded data (which is how browsers tend to send form data from regular forms set to POST)
* and exposes the resulting object (containing the keys and values) on req.body
*/
app.use(bodyParser.urlencoded({
extended: true
}));
/**bodyParser.json(options)
* Parses the text as JSON and exposes the resulting object on req.body.
*/
app.use(bodyParser.json());
app.post("/", function (req, res) {
console.log(req.body.user.name)
});
下面是一个非常简单的无框架包装，基于这里发布的其他答案和文章:
var http = require('http');
var querystring = require('querystring');
function processPost(request, response, callback) {
var queryData = "";
if(typeof callback !== 'function') return null;
if(request.method == 'POST') {
request.on('data', function(data) {
queryData += data;
if(queryData.length > 1e6) {
queryData = "";
response.writeHead(413, {'Content-Type': 'text/plain'}).end();
request.connection.destroy();
}
});
request.on('end', function() {
request.post = querystring.parse(queryData);
callback();
});
} else {
response.writeHead(405, {'Content-Type': 'text/plain'});
response.end();
}
}
使用的例子:
http.createServer(function(request, response) {
if(request.method == 'POST') {
processPost(request, response, function() {
console.log(request.post);
// Use request.post here
response.writeHead(200, "OK", {'Content-Type': 'text/plain'});
response.end();
});
} else {
response.writeHead(200, "OK", {'Content-Type': 'text/plain'});
response.end();
}
}).listen(8000);
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