Java Spring MVC@ModelAttribute绑定子类
我有两个名为District和Street的实体类,在视图中,要形成的是指定的Street对象。如何绑定Street.district.id的值?关于提交,我得到NullPointerException 查看实体和表单:Java Spring MVC@ModelAttribute绑定子类,java,forms,spring-mvc,thymeleaf,Java,Forms,Spring Mvc,Thymeleaf,我有两个名为District和Street的实体类,在视图中,要形成的是指定的Street对象。如何绑定Street.district.id的值?关于提交,我得到NullPointerException 查看实体和表单: <form class="form-inline" action="#" th:action="@{/direct/api/v1/newStreet}" th:object="${street}" method="POST"> <di
<form class="form-inline" action="#" th:action="@{/direct/api/v1/newStreet}" th:object="${street}" method="POST">
<div class="form-group">
<label for="name">Name</label>
<input type="text" th:field="*{name}" class="form-control" id="name" placeholder="Street name"/>
</div>
<div class="form-group">
<label for="district">District</label>
<select class="form-control" id="district">
<option th:each="d : ${districts}" th:field="*{district.id}" th:value="${d.id}" th:text="${d.name}"></option>
</select>
</div>
<button type="submit" class="btn btn-default">Save</button>
在提交表单时,我从输入和空区中获取街道名称。您的错误在选择中 属性 th:field=“*{district.id}” 应在“选择”中,而不是在“选项”标记中 结果:
<select class="form-control" id="district" th:field="*{district.id}">
<option th:each="d : ${districts}" th:value="${d.id}" th:text="${d.name}"></option>
</select>
<select class="form-control" id="district" th:field="*{district.id}">
<option th:each="d : ${districts}" th:value="${d.id}" th:text="${d.name}"></option>
</select>