Upload multiform data

问题

Helo

I tryed to upload some data to my webserver. whit curl works fine

curl -s -uedoweb-admin:admin -F"data=@/home/raul/test/t1/6376990.pdf;type=application/pdf" -XPUT api.localhost/resource/frl:6376979/data

and here the trace http://pastebin.com/jJmungAy

here the new methode.

        URL myurl;
    HttpURLConnection conn;
    String port = "9000";

    String user = "edoweb-admin";
    String password = "admin";
    String encoding = Base64.encodeBase64String((user + ":" + password).getBytes());
    String boundary = "==" + System.currentTimeMillis() + "===";
    String crlf = "\r\n";
    String twoHyphens = "--";
    String attachmentName = "data";
    String attachmentFileName = "6376986.pdf";

    DataOutputStream request;

    try {
        myurl = new URL("http://localhost:9000/resource/frl:6376984/data");
        conn = (HttpURLConnection) myurl.openConnection();
        conn.setDoOutput(true);
        conn.setRequestMethod("PUT");
        conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
        conn.setRequestProperty("Accept", "*/*");

    } catch (Exception e) {
        throw new RuntimeException(e);
    }

    try {
        request = new DataOutputStream(conn.getOutputStream());

        request.writeBytes(twoHyphens + boundary + crlf);
        request.writeBytes("Content-Disposition: form-data; name=\"" + attachmentName + "\";filename=\""
                + attachmentFileName + "\"" + crlf);
        request.writeBytes("Content-Type: application/pdf");
        request.writeBytes(crlf);
        System.out.println(conn.getResponseCode());
    } catch (Exception e) {
        throw new RuntimeException(e);
    }

I found some issues in my code and as well on the webserver. I wrote a new methode and now the server response 400.

can anyone help me?

回答1:

I found it out by myself.

here the code:

public void form_test() {
    try {
        url = new URL("http://localhost:9000/resource/frl:6376984/data");
        httpCon = (HttpURLConnection) url.openConnection();
        String userpass = user + ":" + password;
        basicAuth = "Basic " + new String(new Base64().encode(userpass.getBytes()));
        httpCon.setRequestProperty("Authorization", basicAuth);
        String fieldName = "data";
        File uploadFile = new File("/home/raul/test/frl%3A6376984/6376990.pdf");
        String boundary = "" + System.currentTimeMillis() + "";

        httpCon.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
        httpCon.setRequestProperty("file", "6376986.pdf");

        httpCon.setUseCaches(false);
        httpCon.setDoOutput(true);
        httpCon.setDoInput(true);

        httpCon.setRequestMethod("PUT");

        OutputStream outputStream = null;
        try {
            outputStream = (httpCon.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
        PrintWriter writer = null;
        try {
            writer = new PrintWriter(new OutputStreamWriter(outputStream, "UTF-8"), true);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        String LINE_FEED = "\r\n";
        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);
        System.out.println("Content-Transfer-Encoding: binary" + (LINE_FEED));
        writer.append(LINE_FEED);

        writer.flush();

        fileToOutputStream(uploadFile, outputStream);
        try {
            outputStream.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }

        writer.append(LINE_FEED);
        writer.flush();
        writer.close();
        httpCon.disconnect();

        try {
            System.out.println(httpCon.getResponseCode());
            System.out.println(httpCon.getResponseMessage());
        } catch (IOException e) {
            e.printStackTrace();
        }

    } catch (Exception e) {
        e.printStackTrace();
    }
}

1st mistake was character "=" at the begin of the boundary String. Seems that my Webserver dont like so many equals in the boundary field, so I set just one here:

httpCon.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);

and removed those from the String boundary

String boundary = "" + System.currentTimeMillis() + "";

I also get some error message "Packet size out of Limit" in Wireshark and response Code 400 in Java when I try to upload the File but now with this method it works fine. Thank you guys for the support and the suggestions.

来源：https://stackoverflow.com/questions/34136432/upload-multiform-data