在对象内提交Hashmap的JSP表单绑定

如何解决在对象内提交Hashmap的JSP表单绑定

我无法弄清楚如何将地图数据发送/绑定到控制器。这是详细信息我下面有产品和价格数据类（未提供获取器和设置器），为此，我正在为其构建JSP表单以将产品数据提交给控制器。我可以从产品中读取ID，名称和说明，但是对于地图来说，价格却为空。我要编辑并提交价格地图的两个关键值。

    @Entity
public class Product {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @NotNull
    @Size(max = 50)
    @Column(nullable = false)
    private String name;

    @Column(columnDefinition = "CLOB")
    private String description;

    @OneToMany(mappedBy = "product")
    @MapKey(name = "currency")
    private Map<Currency,Price> prices = new HashMap<>();

}

    @Entity
public class Price {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(nullable = false)
    private Currency currency;

    @Column(nullable = false)
    private BigDecimal amount;

    @ManyToOne
    @JoinColumn(nullable = false)
    private Product product;

下面是我要尝试的JSP

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<html>
    <head>
    </head>
    <body>
        <h3>Here you can edit Product Details</h3>
        <form:form method="POST"
          action="/edit/product" modelAttribute="Product">
             <table>
                <tr>
                     <td><form:label path="id">Id</form:label></td>
                     <td><form:input path="id" value="${product.id}" readonly="true"/></td>
                </tr>
                <tr>
                    <td><form:label path="name">Name</form:label></td>
                    <td><form:input path="name" value="${product.name}" /></td>
                </tr>
                <tr>
                    <td><form:label path="description">Description</form:label></td>
                    <td><form:input path="description" value="${product.description}" /></td>
                </tr>


              <tr>
               <c:forEach items="${Product.prices}" var="priceEntry">
                 <tr>
                    <td>Currency</td>
                    <td><input path="prices[${priceEntry.key}]" value="${priceEntry.key}" /></td>
                    <td>Price</td>
                    <td><input path="prices[${priceEntry.value.amount}]" value="${priceEntry.value.amount}" /></td>
                  </tr>

                 </c:forEach>
                </tr>

                    <td><input type="submit" value="Submit"/></td>
                </tr>
            </table>
        </form:form>
    </body>

    <ul>
        <li><a href="/product/list">View Product List</a></li>
    </ul>
</html>

在对象内提交Hashmap的JSP表单绑定

如何解决在对象内提交Hashmap的JSP表单绑定

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