Java Language Tutorial => POST data

Example

public static void post(String url, byte [] data, String contentType) throws IOException {
    HttpURLConnection connection = null;
    OutputStream out = null;
    InputStream in = null;

    try {
        connection = (HttpURLConnection) new URL(url).openConnection();
        connection.setRequestProperty("Content-Type", contentType);
        connection.setDoOutput(true);

        out = connection.getOutputStream();
        out.write(data);
        out.close();

        in = connection.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        String line = null;
        while ((line = reader.readLine()) != null) {
            System.out.println(line);
        }
        in.close();

    } finally {
        if (connection != null) connection.disconnect();
        if (out != null) out.close();
        if (in != null) in.close();
    }
}

This will POST data to the specified URL, then read the response line-by-line.

How it works

As usual we obtain the HttpURLConnection from a URL.
Set the content type using setRequestProperty, by default it's application/x-www-form-urlencoded
setDoOutput(true) tells the connection that we will send data.
Then we obtain the OutputStream by calling getOutputStream() and write data to it. Don't forget to close it after you are done.
At last we read the server response.

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Java Language HttpURLConnection POST data

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