Upload and POST file to PHP page with Java

Question

I need a way to upload a file and POST it into php page...

My php page is:

Answer 1

This is an old thread, but for the benefit of others, here is a fully working example of exactly what the op asks for:

PHP server code:

Java client code:

import java.io.OutputStream;
import java.io.InputStream;
import java.net.URLConnection;
import java.net.URL;
import java.net.Socket;

public class Main {
    private final String CrLf = "\r\n";

    public static void main(String[] args) {
        Main main = new Main();
        main.httpConn();
    }

    private void httpConn() {
        URLConnection conn = null;
        OutputStream os = null;
        InputStream is = null;

        try {
            URL url = new URL("http://localhost/test/post.php");
            System.out.println("url:" + url);
            conn = url.openConnection();
            conn.setDoOutput(true);

            String postData = "";

            InputStream imgIs = getClass().getResourceAsStream("/test.jpg");
            byte[] imgData = new byte[imgIs.available()];
            imgIs.read(imgData);

            String message1 = "";
            message1 += "-----------------------------4664151417711" + CrLf;
            message1 += "Content-Disposition: form-data; name=\"uploadedfile\"; filename=\"test.jpg\""
                    + CrLf;
            message1 += "Content-Type: image/jpeg" + CrLf;
            message1 += CrLf;

            // the image is sent between the messages in the multipart message.

            String message2 = "";
            message2 += CrLf + "-----------------------------4664151417711--"
                    + CrLf;

            conn.setRequestProperty("Content-Type",
                    "multipart/form-data; boundary=---------------------------4664151417711");
            // might not need to specify the content-length when sending chunked
            // data.
            conn.setRequestProperty("Content-Length", String.valueOf((message1
                    .length() + message2.length() + imgData.length)));

            System.out.println("open os");
            os = conn.getOutputStream();

            System.out.println(message1);
            os.write(message1.getBytes());

            // SEND THE IMAGE
            int index = 0;
            int size = 1024;
            do {
                System.out.println("write:" + index);
                if ((index + size) > imgData.length) {
                    size = imgData.length - index;
                }
                os.write(imgData, index, size);
                index += size;
            } while (index < imgData.length);
            System.out.println("written:" + index);

            System.out.println(message2);
            os.write(message2.getBytes());
            os.flush();

            System.out.println("open is");
            is = conn.getInputStream();

            char buff = 512;
            int len;
            byte[] data = new byte[buff];
            do {
                System.out.println("READ");
                len = is.read(data);

                if (len > 0) {
                    System.out.println(new String(data, 0, len));
                }
            } while (len > 0);

            System.out.println("DONE");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            System.out.println("Close connection");
            try {
                os.close();
            } catch (Exception e) {
            }
            try {
                is.close();
            } catch (Exception e) {
            }
            try {

            } catch (Exception e) {
            }
        }
    }
}

you can figure out how to adapt it for your site, but I have tested the above code and it works. I can't take credit for it though >> See Original Post