node.jsサーバーでjavaを使用してアップロードします。 req.filesが空です

Question

私はjavaFXを使用してnode.jsサーバーにファイルをアップロードしようとしています

このコードはnode.jsサーバーでファイルをアップロードするためのコードです。

マイコードを簡略化しました。

var express = require('express'); 
var path = require('path'); 
var logger = require('morgan'); 
var methodOverride = require('method-override'); 
var app  = express(); 
var bodyParser = require('body-parser'); 
var methodOverride = require('method-override'); 
var argv = require('optimist').argv; 
var fs = require('fs'); 
app.use('/js', express.static(__dirname + '/js')); 
app.use(morgan('dev')); 
app.use(methodOverride()); 
app.use(bodyParser({keepExtensions:true,uploadDir:path.join(__dirname,'/files')})); 
var busboy = require('connect-busboy'); 
app.use(busboy()); 
var fileupload = require('fileupload').createFileUpload('/home/kimmj8409/Myweb_front_end').middleware 
app.post('/upload', fileupload, function(req, res) { 
    res.send(req.body); 
}) 

app.listen(8080, argv.fe_ip); 
console.log("App listening on port 8080"); 

とサーバー

MultipartUtility.java

public class MultipartUtility { 
private final String boundary; 
private static final String LINE_FEED = "\r\n"; 
private HttpURLConnection httpConn; 
private String charset; 
private OutputStream outputStream; 
private PrintWriter writer; 


public MultipartUtility(String requestURL, String charset) 
     throws IOException { 
    this.charset = charset; 
    boundary = "===" + System.currentTimeMillis() + "==="; 

    URL url = new URL(requestURL); 
    httpConn = (HttpURLConnection) url.openConnection(); 
    httpConn.setUseCaches(false); 
    httpConn.setDoOutput(true); 
    httpConn.setDoInput(true); 
    httpConn.setRequestProperty("Content-Type", 
      "multipart/form-data; boundary=" + boundary); 
    httpConn.setRequestProperty("User-Agent", "CodeJava Agent"); 
    httpConn.setRequestProperty("Test", "Bonjour"); 
    outputStream = httpConn.getOutputStream(); 
    writer = new PrintWriter(new OutputStreamWriter(outputStream, charset), 
      true); 
} 

public void addFormField(String name, String value) { 
    writer.append("--" + boundary).append(LINE_FEED); 
    writer.append("Content-Disposition: form-data; name=\"" + name + "\"") 
      .append(LINE_FEED); 
    writer.append("Content-Type: text/plain; charset=" + charset).append(
      LINE_FEED); 
    writer.append(LINE_FEED); 
    writer.append(value).append(LINE_FEED); 
    writer.flush(); 
} 

public void addFilePart(String fieldName, File uploadFile) 
     throws IOException { 
    String fileName = uploadFile.getName(); 
    writer.append("--" + boundary).append(LINE_FEED); 
    writer.append(
      "Content-Disposition: form-data; name=\"" + fieldName 
        + "\"; filename=\"" + fileName + "\"") 
      .append(LINE_FEED); 
    writer.append(
      "Content-Type: " 
        + URLConnection.guessContentTypeFromName(fileName)) 
      .append(LINE_FEED); 
    writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED); 
    writer.append(LINE_FEED); 
    writer.flush(); 

    FileInputStream inputStream = new FileInputStream(uploadFile); 
    byte[] buffer = new byte[4096]; 
    int bytesRead = -1; 
    while ((bytesRead = inputStream.read(buffer)) != -1) { 
     outputStream.write(buffer, 0, bytesRead); 
    } 
    outputStream.flush(); 
    inputStream.close(); 

    writer.append(LINE_FEED); 
    writer.flush();  
} 

public void addHeaderField(String name, String value) { 
    writer.append(name + ": " + value).append(LINE_FEED); 
    writer.flush(); 
} 

public List<String> finish() throws IOException { 
    List<String> response = new ArrayList<String>(); 

    writer.append(LINE_FEED).flush(); 
    writer.append("--" + boundary + "--").append(LINE_FEED); 
    writer.close(); 

    // checks server's status code first 
    int status = httpConn.getResponseCode(); 
    if (status == HttpURLConnection.HTTP_OK) { 
     BufferedReader reader = new BufferedReader(new InputStreamReader(
       httpConn.getInputStream())); 
     String line = null; 
     while ((line = reader.readLine()) != null) { 
      response.add(line); 
     } 
     reader.close(); 
     httpConn.disconnect(); 
    } else { 
     throw new IOException("Server returned non-OK status: " + status); 
    } 

    return response; 
} 
} 

メインコードのNode.jsこれと接続するためのjavacodeです：私のコードをデバッグして

private void TCP_File_Client() throws IOException{ 
    String url = PATH +"/upload"; 
    String charset = "UTF-8"; 
    String param = "value"; 
    File textFile = new File(data_n3_PATH); 
    File binaryFile = new File(data_n3_PATH); 
    String boundary = Long.toHexString(System.currentTimeMillis()); 
    String CRLF = "\r\n"; 
    URLConnection connection = new URL(url).openConnection(); 
    HttpURLConnection http = (HttpURLConnection) connection; 
    http.setRequestMethod("POST"); 
    connection.setDoOutput(true); 
    connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary); 


    File uploadFile1 = new File(data_n3_PATH); 
    File uploadFile2 = new File(data_n3_PATH); 
    String requestURL = PATH +"/upload"; 

    try { 
     MultipartUtility multipart = new MultipartUtility(requestURL, charset); 

     multipart.addHeaderField("User-Agent", "CodeJava"); 
     multipart.addHeaderField("Test-Header", "Header-Value"); 

     multipart.addFormField("description", "Cool Pictures"); 
     multipart.addFormField("keywords", "Java,upload,Spring"); 

     multipart.addFilePart("fileUpload", uploadFile1); 
     multipart.addFilePart("fileUpload", uploadFile2); 

     List<String> response = multipart.finish(); 

     System.out.println("SERVER REPLIED:"); 

     for (String line : response) { 
      System.out.println(line); 
     } 
    } catch (IOException ex) { 
     System.err.println(ex); 
    } 




} 

を、私が見つかりました。そのPOSTリクエストはnode.jsサーバーに行くことができますが、ファイルが見つかりません。 req.filesが空でreqのファイルのように見えません。

とIOException（「サーバーは正常でない状態を返しました：」+ステータス）を受け取りました。 500ステータスあり

どうすればこれらを接続できますか？

Answer 1

read https://github.com/expressjs/multer/issues/345。 node.jsモジュールのmulterを使用できます。