强大的.解析方法不执行，nodejs和强大的包

formidable.parse method not executing, nodejs and formidable package

本文关键字：nodejs 方法 执行      更新时间：2023-09-26

问题: .parse()方法从节点包'formidable'不想执行。

资源:这个网站上的代码片段是我用来参考的，如果有帮助的话:https://github.com/felixge/node-formidable

描述:我试图创建一个网站，可以上传和存储服务器端代码与nodejs文件。我使用httpdispatcher包来指导用户，使用强大的包来处理上传表单。

我遇到了一个问题，每次我的程序都按预期执行，直到强大的包方法parse()，然后停止做任何事情。浏览器选项卡试图重新加载，大约5分钟后显示了一个错误，"服务器没有发回任何内容"。我没有收到来自node的错误信息。

显然，这段代码只将处理过的表单数据发送回用户。我只是在我认为合理的范围内简化了它。

代码:nodejs (server.js文件): 

var http = require('http');
console.log('http loaded');
var fs = require('fs');
console.log('fs loaded');
var dispatcher = require('httpdispatcher');
console.log('dispatcher loaded');
var formidable = require('formidable');
console.log('formidable loaded');
var util = require('util');
console.log('util loaded');
dispatcher.setStaticDirname('.');
dispatcher.setStatic('resources');
dispatcher.onGet('/main', function(request, response){
    response.writeHead(200, {'Content-Type': 'text/html'});
    fs.readFile('index.html', function(error, html){
        response.end(html); //Callbacked to prevent async send of file read
    })
});
dispatcher.onPost('/main', function(request, response){
    console.log('upload url accessed');
    processForm(request, response);
});
const PORT = 8000;
function processForm(request, response){
    console.log('processForm launched');
    var form = new formidable.IncomingForm();
    console.log('formidable initailised');
    form.parse(request, function(error, fields, files){
        console.log('form parsing started');
        response.writeHead(200, {'content-type': 'text/plain'});
        console.log('head written');
        response.write('data recieved:'n'n');
        response.end(util.inspect({fields: fields, files: files}));
        console.log('form passing ended');
    });
}
function saveImage(){
    console.log('saveImage called');
    fs.readFile(request.files.uploadImage.path, function(error, imageData){
        console.log('reading file');
        path = './uploadedImages';
        fs.writeFile(path, imageData, function(error){
            console.log('fs encountered an error: %s', error);
        });
    });
    console.log('saveImage ended');
}
function handleRequest(request, response){
    console.log('request handler started');
    console.log('request method: %s', request.method);
    try{
        console.log(`URL: %s was requested`, request.url);
        dispatcher.dispatch(request, response);
    }
    catch(error){
        console.log(`httpdispatcher encountered an error: %s`, error);
    }
    console.log('request handler ended');
}
var server = http.createServer(handleRequest);
server.listen(PORT, function(){
    //Callback triggered when server is successfully listening.
    console.log("Server listening on: http://localhost:%s", PORT);
});

代码:html文件(index . html): 

<!DOCTYPE html>
<html>
<head></head>
<body>
    <form action="" method="post" enctype="multipart/form-data">
        <input type="file" name="uploadImage">
    </form>
    <form action="" enctype="multipart/form-data" method="post">
         <fieldset>
            <label for="imageTitle">Image title:</label>
            <input type="text" id="imageTitle" name="imageTitle" placeholder="Enter title of image" />
            <br />
            <label for="imageDesription">Image desription:</label>
            <textarea id="imageDesription" name="imageDesription" placeholder="Enter a description of the image"></textarea>
            <br />
            <input type="submit" value="Upload Image" />
         </fieldset>
      </form>
</body>
</html>

提前感谢。

看起来httpdispatcher修改了request缓冲区，以至于无法从中提取表单值。

为了测试这一点，你可以直接在http模块的回调中处理post请求，而不调度请求:

function handleRequest(request, response){
    console.log('request handler started');
    console.log('request method: %s', request.method);
     // HERE
    if (request.method == 'POST') {
        processForm(request, response);
        return;
    }
    try{
        console.log(`URL: %s was requested`, request.url);
        dispatcher.dispatch(request, response);
    }
    catch(error){
        console.log(`httpdispatcher encountered an error: %s`, error);
    }
    console.log('request handler ended');
}

我建议您使用express来分派基于方法和路由的请求。

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