URL yahoo = new URL("http://www.stackoverflow.com/");
BufferedReader in = new BufferedReader(
            new InputStreamReader(
            yahoo.openStream()));

String inputLine;

while ((inputLine = in.readLine()) != null)
    System.out.println(inputLine);

in.close();

<script>
function dosubmit() {
    var url = document.getElementById("url-input").value;
    $.ajax({
        url:url,
        crossOrigin: true,
        success: function(response){
            alert(response);
        },
        error: function (XMLHttpRequest, textStatus, errorThrown) {
            alert(errorThrown);
        }
    })
}