CODEWITHSUNDEEP
javahttpurlconnection
shre
shre

Reputation: 11

Unable to upload file using HttpURLConnection

I've been using HttpURLConnection to upload a file but on execution I get an error like:

request was rejected because no multipart boundary was found

Following is my code snippet

File importFile = new File(args[0]);
url = new URL("http://localhost:8888/ajax/import?action=csv&session=" + sessionId + "&folder=36");
URLConnection uc = url.openConnection();
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Cookie", cookieStringBuffer.toString());
connection.setRequestProperty("content-type", "multipart/form-data");
connection.setDoOutput(true);
connection.connect();

FileInputStream is = new FileInputStream(importFile);
OutputStream os = connection.getOutputStream();
PrintWriter pw = new PrintWriter(os);
byte[] buffer = new byte[4096];
int bytes_read;
while((bytes_read = is.read(buffer)) != -1) {
   //os.write(buffer, 0, bytes_read);
   pw.print(buffer); // here we "send" our body!
}
pw.flush();
pw.close();

How can I correct the problem?

Upvotes: 1

Views: 6966

Answers (2)

Femi
Femi

Reputation: 64700

You need Multipart File upload: http://www.theserverside.com/news/1365153/HttpClient-and-FileUpload

Example from the link provided:

package com.commonsbook.chap9;
import java.io.File;
import java.io.IOException;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.MultipartPostMethod;

public class HttpMultiPartFileUpload {
    private static String url =
      "http://localhost:8080/HttpServerSideApp/ProcessFileUpload.jsp";

    public static void main(String[] args) throws IOException {
        HttpClient client = new HttpClient();
        MultipartPostMethod mPost = new MultipartPostMethod(url);
        client.setConnectionTimeout(8000);

        // Send any XML file as the body of the POST request
        File f1 = new File("students.xml");
        File f2 = new File("academy.xml");
        File f3 = new File("academyRules.xml");

        System.out.println("File1 Length = " + f1.length());
        System.out.println("File2 Length = " + f2.length());
        System.out.println("File3 Length = " + f3.length());

        mPost.addParameter(f1.getName(), f1);
        mPost.addParameter(f2.getName(), f2);
        mPost.addParameter(f3.getName(), f3);

        int statusCode1 = client.executeMethod(mPost);

        System.out.println("statusLine>>>" + mPost.getStatusLine());
        mPost.releaseConnection();
    }
}

Upvotes: 1

sbridges
sbridges

Reputation: 25140

Your code to copy file to the output stream is wrong, remove the line

PrintWriter pw = new PrintWriter(os);

and instead of using pw, write to os with the correct count of bytes read,

os.write(buffer, 0 bytes_read);

Upvotes: 0

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