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Home.html

Bootstrap

https://getbootstrap.com/

Starter template

https://getbootstrap.com/docs/4.3/getting-started/introduction/

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

    <title>Hello, world!</title>
  </head>
  <body>
    <h1>Hello, world!</h1>

    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
  </body>
</html>

NavBar

https://getbootstrap.com/docs/4.3/components/navbar/

<nav class="navbar navbar-light bg-light">
  <a class="navbar-brand">Navbar</a>
  <form class="form-inline">
    <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
    <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
  </form>
</nav>
src/main/resources/templates/home.html 
<!DOCTYPE html>
<html lang="en">
<head>
  <title>Reactive Link Shortener Sample Application</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
  <style>
    body {
      text-align: center;
      background-color: #f1f1f1;
    }
    .centered {
      display: table;
      margin-left: auto;
      margin-right: auto;
      display: inline-block;
    }
    .form-inline .form-control {
      width: 500px;
    }
  </style>
  <script>
  var hosturl = window.location.protocol + "//" + window.location.hostname + "/link/";
  $(document).ready( function() {
      $( "#searchForm" ).submit(function( event ) {
        event.preventDefault();
        var url = $(this).attr( "action" );
        var senddata = $(this).find( "input[name='link']" ).val();
        $.ajax({
            type: 'POST',
            url: url,
            data: '{"link": "'+senddata+'"}',
            success: function(data) {
              $("#content").html('<a href="'+hosturl+data.shortenedLink+'" target="_blank">'+hosturl+data.shortenedLink+'</a>');
            },
            contentType: "application/json",
            dataType: 'json'
        });
      });
   });
  </script>
</head>
<body>
<br><br><br>
<div class="centered">
  <nav class="navbar navbar-expand-sm navbar-dark">
    <form class="form-inline" action="/link" id="searchForm">
      <input class="form-control mr-sm-2" name="link" type="text" placeholder="http://www.google.com">
      <button class="btn btn-success" type="submit">Make Link</button>
    </form>
  </nav>
  <div id="content">
  </div>
</div>
</body>
</html>

WebController.java

src/main/java/com/example/demo/WebController.java

package com.example.demo;

import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

@Controller
@RequiredArgsConstructor
public class WebController {

    @GetMapping("/home")
    public String home(Model model) {
        return "home";
    }
}


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