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フォームに問題があります。私はボタンを使用すると、フォームで指定されたものの代わりに現在のアドレスにポストメソッドを使用しています。私はその形で何が間違っているのか分かりません。私は本当にいくつかの助けに感謝します。ボタンは現在のアドレスに投稿します
th:action:="@{/shoppingCart/addItem}"
：あなたがタイプミスを持っているよう
<form th:action:="@{/shoppingCart/addItem}" method="post">
<input hidden="hidden" th:value="*{book.id}"/><!--both name and value are taken care of by that syntax -->
<div class="row" style="margin-top: 120px">
<div class="col-xs-3">
<a th:href="@{/bookshelf}">Back to book list. </a><br/>
<img class="img-responsive shelf-book" th:src="#{adminPath}[email protected]{/image/book/}+${book.id}+'.png'"/>
</div>
<div class="col-xs-9">
<h3 th:text="${book.title}">Book Title</h3>
<div class="row">
<div class="col-xs-5">
<h5><strong>Author: </strong><span th:text="${book.author}"></span></h5>
<p><strong>Publisher: </strong><span th:text="${book.publisher}"></span></p>
<p><strong>Publication Date: </strong><span th:text="${book.publicationDate}"></span></p>
<p><strong>Language: </strong><span th:text="${book.language}"></span></p>
<p><strong>Category: </strong><span th:text="${book.category}"></span></p>
<p><strong><span th:text="${book.format}"></span></strong> : <span th:text="${book.numberOfPages}"></span> pages</p>
<p><strong>ISBN: </strong><span th:text="${book.isbn}"></span></p>
<p><strong>Shipping weight: </strong><span th:text="${book.shippingWeight}"></span> kg</p>
</div>
<div class="col-xs-5">
<div class="panel panel-default" >
<div class="panel-body">
<div class="row">
<div class="col-xs-6">
<h4>Our price: <span>$ <span style="color: #db3208;" th:text="${book.ourPrice}"></span></span> </h4>
<p>List price: <span>$ <span style="text-decoration: line-through" th:text="${book.listPrice}"></span></span> </p>
<p>You save: <span th:text="${#numbers.formatDecimal((book.listPrice - book.ourPrice), 0, 'COMMA', 2, 'POINT')}"></span> </p>
<span>Qty: </span>
<select>
<option th:each="qty : ${qtyList}" th:value="${qty}" th:text="${qty}" ></option>
</select>
</div>
<div class="col-xs-6">
<h4 th:if="*{book.inStockNumber>9}" style="color: green">In Stock;</h4>
<h4 th:if="*{book.inStockNumber>0 and book.inStockNumber<10}" style="color: green">Only <span th:text="${book.inStockNumber}"></span> left.</h4>
<h4 th:if="*{book.inStockNumber==0}" style="color: darkred">SOLD OUT.</h4>
<button type="submit" class="btn btn-warning" style="color: black; border: solid 1px">Add to cart</button>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<hr style="color: black; height: 2px; width: 100%"/>
<p th:utext="${book.description}"></p>
</div>
</form>
サイトのHTMLコードは、ボタンを使用した後
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<meta name="description" content="" />
<meta name="author" content="" />
<link rel="icon" href="../../favicon.ico" />
<title>Bookstore</title>
<!--Font Awesome-->
<link rel="stylesheet" href="/lib/components-font-awesome/css/font-awesome.min.css" />
<!-- Bootstrap core CSS -->
<link href="/lib/bootstrap/dist/css/bootstrap.min.css" rel="stylesheet" />
<!-- Custom styles for this template -->
<link href="/css/style.css" rel="stylesheet" />
</head>
<body>
<div>
<div class="page-top" style="width: 100%; height: 20px; background-color: #f46b42; margin-top: -15px"></div>
<!-- Static navbar -->
<nav class="navbar navbar-inverse">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Bookstore</a>
</div>
<div id="navbar" class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false" href="/bookshelf">Books <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="/bookshelf">Browse the bookshelf</a></li>
<li><a href="#">Opening hours & directions</a></li>
<li><a href="#">FAQ</a></li>
</ul>
</li>
<form class="navbar-form navbar-left">
<div class="form-group">
<input type="text" class="form-control" placeholder="Search" />
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="/shoppingCart/cart">SHOPPING CART</a></li>
<li><a href="/login">MY ACCOUNT</a></li>
<li></li>
<li></li>
</ul>
</div><!--/.nav-collapse -->
</div><!--/.container-fluid -->
</nav>
</div>
<div class="container">
<hr style="position: absolute; background-color: #333; z-index: -1; height: 6px; width: 100%; margin-top: 100px" />
<div class="row">
<div class="col-xs-8"><h2 class="section-headline"><span>Welcome guest.</span></h2> </div>
<div class="col-xs-4"><img src="/image/logo.png" class="img-responsive" /></div>
</div>
<img src="/image/wood.png" class="img-responsive" style="margin-top: -75px" />
<form th:action:="@{/shoppingCart/addItem}" method="post">
<input hidden="hidden" value="1" /><!--both name and value are taken care of by that syntax -->
<div class="row" style="margin-top: 120px">
<div class="col-xs-3">
<a href="/bookshelf">Back to book list. </a><br />
<img class="img-responsive shelf-book" src="http://localhost:8081/adminportal/image/book/1.png" />
</div>
<div class="col-xs-9">
<h3>tre</h3>
<div class="row">
<div class="col-xs-5">
<h5><strong>Author: </strong><span>wss</span></h5>
<p><strong>Publisher: </strong><span>wew</span></p>
<p><strong>Publication Date: </strong><span>5666</span></p>
<p><strong>Language: </strong><span>polish</span></p>
<p><strong>Category: </strong><span>Biography</span></p>
<p><strong><span>Hardcover</span></strong> : <span>66</span> pages</p>
<p><strong>ISBN: </strong><span>667</span></p>
<p><strong>Shipping weight: </strong><span>7.0</span> kg</p>
</div>
<div class="col-xs-5">
<div class="panel panel-default">
<div class="panel-body">
<div class="row">
<div class="col-xs-6">
<h4>Our price: <span>$ <span style="color: #db3208;">10.0</span></span> </h4>
<p>List price: <span>$ <span style="text-decoration: line-through">12.0</span></span> </p>
<p>You save: <span>2.00</span> </p>
<span>Qty: </span>
<select>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select>
</div>
<div class="col-xs-6">
<h4 style="color: green">Only <span>8</span> left.</h4>
<button type="submit" class="btn btn-warning" style="color: black; border: solid 1px">Add to cart</button>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<hr style="color: black; height: 2px; width: 100%" />
<p><p>hhgvhhu</p></p>
</div>
</form>
</div>
<div>
<!-- Bootstrap core JavaScript
================================================== -->
<!-- Placed at the end of the document so the pages load faster -->
<script src="/lib/jquery/dist/jquery.min.js"></script>
<script src="/lib/bootstrap/dist/js/bootstrap.min.js"></script>
</div>
</body>
</html>
すぎて生成されたHTMLコードを投稿してください（ブラウザから） –
htmlコード – karjan