Link two contacts(make friends) on clicking add friend, in java.

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Java

JSP

servlet

while(rs.next())
{
    out.print("<table><tbody><tr><td>"+rs.getString(2));              
    out.print("  <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>");
    out.print(" <script src=\"js/index.js\"></script>");
    // out.print("<button type=\"button\" onclick=friendnamebtn() id=\"btn_friends\">");
    out.print("<button type=\"button\" onclick='javascript:return friendnamebtn(this)' id=\"btn_friends\">");
    out.print("Add" + rs.getString(2));
    out.print("</button>");
    out.print("</td></tr></tbody></table>");
}

made a click event using javascript

function friendnamebtn()
{
     var friends = document.getElementById("btn_friends");
     alert("add");
}

Now i want to link the contact which is logged in (i can get it's id using session) and the person whom i want to connect using javascript. but where to write my database code? cause i have event in javascript.