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public class HiServlet extends HttpServlet{
 @Override
 protected void service(HttpServletRequest req, HttpServletResponse res)
 throws ServletException, IOException {
 res.setContentType("text/html");
 PrintWriter pw = res.getWriter();
 pw.write("<h1 style='color:#6db33f'>hello world</h1>");
 pw.close();
 }
}