Java HttpExchange: Data missing in POST Request Body

Question

In my Java application I use the com.sun.net.httpserver classes for a small built-in web server. I also want to support file uploads. From a web page the user can select a file in a standard HTML form:

<form action="${home_url}/upload" enctype="multipart/form-data" method="post">
    <fieldset>
        <input type="file" id="inp" name="filename" size="50"><br>
        <input type="submit" id="btn" value="Upload">
    </fieldset>
</form>

In the handler for that upload page (where data is posted to) I do the following:

InputStreamReader input = new InputStreamReader(exchange.getRequestBody(), "utf-8");
BufferedReader reader = new BufferedReader(input);
String line = reader.readLine();
while(line != null)
{
    parser.addLine(line);
    line = reader.readLine();
}

However, the first time I call reader.readLine() the String that I receive does not contain the first line of the original file. Instead, this first line I get in Java code is part of a line somewhere in the middle of the uploaded file.

It seems the first part of the file is lost somehow. This is reproducible, and what I get from the first readLine() is always the same (as always the same amount of bytes get lost during upload).

Any ideas?

Java HttpExchange: Data missing in POST Request Body

0 Answers0