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?
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
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)
});
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);
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);
如果希望表单数据在req.body中可用,则需要使用bodyParser()。 Body-parser解析您的请求并将其转换为可以轻松提取所需相关信息的格式。
例如,假设在前端有一个注册表单。您正在填写它,并请求服务器将详细信息保存在某个地方。
如果使用体解析器,则从请求中提取用户名和密码如下所示。
.............................................................
var loginDetails = {
username : request.body.username,
password : request.body.password
};
你可以使用querystring模块:
var qs = require('querystring');
function (request, response) {
if (request.method == 'POST') {
var body = '';
request.on('data', function (data) {
body += data;
// Too much POST data, kill the connection!
// 1e6 === 1 * Math.pow(10, 6) === 1 * 1000000 ~~~ 1MB
if (body.length > 1e6)
request.connection.destroy();
});
request.on('end', function () {
var post = qs.parse(body);
// use post['blah'], etc.
});
}
}
现在,例如,如果你有一个名为age的输入字段,你可以使用变量post访问它:
console.log(post.age);
不使用express也可以提取post参数。
1: NMP安装多方
2:导入多方。As var multiparty = require('multiparty');
3: `
if(req.method ==='POST'){
var form = new multiparty.Form();
form.parse(req, function(err, fields, files) {
console.log(fields['userfile1'][0]);
});
}
4:和HTML形式是。
<form method=POST enctype=multipart/form-data>
<input type=text name=userfile1><br>
<input type=submit>
</form>
我希望这对你有用。谢谢。