@WebServlet("/typologieKontrolle")
public class typologieKontrolle extends HttpServlet {
private static final long serialVersionUID = 1L;


protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    String data= request.getParameter("id");

    String[] neu = data.split(",");


    List risikobereich_kunde = new ArrayList();
    List risikobereich_produkte = new ArrayList();


    PrintWriter out = response.getWriter();

    for (int i=0;i<neu.length;i++) {

    try {
        Class.forName("com.mysql.jdbc.Driver");
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost/test","admin","****");
        PreparedStatement stmt = con.prepareStatement("SELECT id,risikobereich FROM tabelle_abstrakt WHERE id = ?");
        stmt.setString(1, neu[i]);
        ResultSet rs = stmt.executeQuery();

        if(rs.next())
        {

            if(rs.getString("risikobereich") == "Kunden")
            {
                risikobereich_kunde.add(rs.getString("id"));
            }
            else if(rs.getString("risikobereich") == "Produkte")
            {
                risikobereich_produkte.add(rs.getString("id"));
            }

        }
        System.out.println("KUNDE : " + risikobereich_kunde);
        System.out.println("PRODUKTE : " + risikobereich_produkte);

        stmt.close();
        con.close();

    } catch (Exception e) {

        e.printStackTrace();
    }

    }
  }
}