從Node.js中的請求中提取POST參數

Question

我試圖通過使用-（我使用了這個，因為在這里建議-因為我如何使用express js獲取發布請求？ ）從變量postData中的POST獲取參數。

在這里- 如何檢索POST查詢參數？

var express = require('express');
var app = express();
var fs = require('fs');
var json = require('json');
app.use(express.json());       // to support JSON-encoded bodies
app.use(express.urlencoded()); // to support URL-encoded bodies

app.post('/shrib/:file/:data',function(req,res){
    var fileName = req.params.file;
    var data = req.params.data;
    req.on('data',function(data){ body+=data; } );
    req.on('end' ,function(){
        var postData = qs.parse(body);
        var writeStream = fs.createWriteStream(fileName);
        var postData = req.body.text;
        if(postData)
            console.log(postData);
        else    
            console.log("failed miserably");
        res.write(200);
        res.end();
    });
});
app.get('/shrib/:file',function(req,res){   
    var fileName = req.params.file;
    if(fileName != ''){
        var readStream = fs.createReadStream(fileName);
        var content;
        readStream.on('data',function(chunk){
            content+=chunk.toString();
            console.log(content);
        });
        readStream.on('end',function(){
            res.writeHead(200,{"Content-Type":"text/html"});
            res.write("<form id=\"submitForm\" method=\"POST\">");
            res.write("<textarea id=\"text\"rows=50 cols=50 >");
            console.log(content);
            if(content)
                res.write(content.toString());
            res.write("</textarea>");
            res.write("<input type=\"submit\" value=\"submit\" />");
            res.write("</form>");
            res.write("<script>");
            res.write("var windowLocation = location.href;");
            res.write("document.getElementById(\"submitForm\").action=windowLocation + \'/data\';");
            res.write("</script>");
            res.end();
        });
    }else{
        res.writeHead(200);
        res.write("invalid/empty path name"); 
    }
});
app.listen(8080);

並收到此錯誤-

Error: Most middleware (like json) is no longer bundled with Express and must be installed separately. Please see https://github.com/senchalabs/connect#middleware.
    at Function.Object.defineProperty.get (/home/unknown/public_html/node/node_modules/express/lib/express.js:89:13)

我使用的是body解析器，在此之前我在這里閱讀了一些解決方案，它給了我相同的錯誤中間件，我在全局安裝了它，然后又遇到了同樣的錯誤，然后我讀到了json，因此我使用

npm install -g json

也沒有用 然后我嘗試添加依賴項-

{
  "name": "express_shrib.js",
  "version": "0.0.1",
  "description": "Creating Shrib Using Express",
  "main": "express_shrib.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "https://github.com/iamdeadman/nodejs.git"
  },
  "author": "",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/iamdeadman/nodejs/issues"
  },
  "homepage": "https://github.com/iamdeadman/nodejs",
  "dependencies": {
    "express": ">= 1.2.0",
    "json": ">= 9.0.0"
  }
}

並運行npm install仍然相同的錯誤-

Error: Most middleware (like json) is no longer bundled with Express and must be installed separately. Please see https://github.com/senchalabs/connect#middleware.
    at Function.Object.defineProperty.get (/home/unknown/public_html/node/node_modules/express/lib/express.js:89:13)

編輯**-使用新的body-parser模塊進行編碼

var express = require('express');
var app = express();
var fs = require('fs');
var bodyParser = require('body-parser');
app.use(bodyParser());
app.post('/shrib/:file/:data',function(req,res){
    var fileName = req.params.file;
    var data = req.params.data;
    req.on('data',function(data){ body+=data; } );
    req.on('end' ,function(){
        var postData = req.body;
        var writeStream = fs.createWriteStream(fileName);
        if(postData)
            console.log(postData);
        else{   
            console.log("failed miserably");
            console.log(postData);
        }
        res.writeHead(200);
        res.end();
    });
});
app.get('/shrib/:file',function(req,res){   
    var fileName = req.params.file;
    if(fileName != ''){
        var readStream = fs.createReadStream(fileName);
        var content;
        readStream.on('data',function(chunk){
            content+=chunk.toString();
            console.log(content);
        });
        readStream.on('end',function(){
            res.writeHead(200,{"Content-Type":"text/html"});
            res.write("<form id=\"submitForm\" method=\"POST\">");
            res.write("<textarea id=\"text\"rows=50 cols=50 >");
            console.log(content);
            if(content)
                res.write(content.toString());
            res.write("</textarea>");
            res.write("<input type=\"submit\" value=\"submit\" />");
            res.write("</form>");
            res.write("<script>");
            res.write("var windowLocation = location.href;");
            res.write("document.getElementById(\"submitForm\").action=windowLocation + \'/data\';");
            res.write("</script>");
            res.end();
        });
    }else{
        res.writeHead(200);
        res.write("invalid/empty path name"); 
    }
});
app.listen(8080);

我在這里

{}

在控制台中，這意味着主體對象出於某種原因為空。

Answer 1

使用Express 4，主體解析中間件（就像其他以前內置的中間件一樣）被提取到“ body-parser”模塊中。 但是，此新模塊僅處理JSON和urlencoded表單提交，而不處理多部分內容。

如果需要多部分支持，則需要使用諸如connect- busboy或multer或connect-multiparty之類的東西 （connect-multiparty本質上是舊的Express bodyParser中間件）。

編輯：此外，textarea輸入字段缺少name屬性。 這是必需的，否則該字段將不會與表格一起發送。

Answer 2

使用Express 4時，請使用body解析器中間件獲取參數。 Multipart具有創建臨時文件負載的問題。 因此，最好避免在可能的情況下直接使用上傳服務。

app.use(function (req, res, next) {
        var urlParser = require('url');
        var url = urlParser.parse(req.url, true);
        if (url.pathname == "/rest/file/upload") {
            next();
        } else {
            var contentType = req.header("content-type");
            if (contentType && contentType.indexOf("application/json") != -1) {
                bodyParser.json({limit: 1024 * 1024 * 10})(req, res, next);
            } else {
                bodyParser.urlencoded({ extended: true, limit: 1024 * 1024 * 10})(req, res, next);
            }
        }
    });

然后只需將您的請求參數獲取為：

console.log(req.param("parameter-name"));