Upload mit Java mit node.js Server. req.files ist leer

Question

Ich versuche meine Datei auf node.js Server mit javaFX

hochladen Dieser Code ist für node.js Server zum Hochladen meiner Datei.

Vereinfachte meinen Code.

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"); 

und es ist javacode mit diesem verbinden node.js Server

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; 
} 
} 

Hauptcode:

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); 
    } 




} 

Mit meinem Code debuggen, ich gefunden Diese POST-Anfrage kann auf den node.js-Server gehen, aber ich kann die Datei nicht finden. req.files ist leer und ich kann nichts finden sieht wie Datei in req.

und ich empfange IOException ("Server gab Nicht-OK-Status zurück:" + Status); mit 500 Status

Wie kann ich diese verbinden?

Answer 1

lesen https://github.com/expressjs/multer/issues/345. Sie können node.js Modul multer.