如何处理POST数据在Node.js?

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

如果它涉及文件上传，浏览器通常以“multipart/form-data”内容类型发送它。您可以在这种情况下使用它

var multipart = require('multipart');
multipart.parse(req)

参考1

参考2

2015-08-13 13:52:06

其他回答

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);

2010-11-30 02:44:51

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

2022-05-22 15:40:17

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);

2015-08-07 02:57:50

Node.js 18的现代异步方式，零依赖:

server.mjs:

import { createServer } from 'node:http';

const rawReqToString = async (req) => {
    const buffers = [];
    for await(const chunk of req){
        buffers.push(chunk);
    }
    return Buffer.concat(buffers).toString();
};

const server = createServer(async (req, res) => {
    const object = JSON.parse(await rawReqToString(req));
    ...
});

server.listen(3000, 'localhost', () => {
    console.log(`The server is running.`);
})

2022-11-02 14:22:44

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

};

2019-03-04 08:46:12

如何处理POST数据在Node.js?

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