thymeleaf 判断select 下拉框 赋值并选中

下拉框赋值选中：

   <div class="form-group">
                <label class="col-sm-3 control-label">类别：</label>
                <div class="col-sm-8">
                    <select name="category" class="form-control" type="text" id="category" th:field="*{category}">
                        <option th:value="0" >本省</option>
                        <option th:value="1" >省外资源</option>
                    </select>
                </div>
            </div>
            
<div class="col-sm-8">
    <select name="teachpoint" class="form-control m-b" th:with="type=${@dict.getType('teach_point')}">
        <option></option>
        <option th:each="dict : ${type}" th:text="${dict.dictLabel}" th:value="${dict.dictValue}"  ></option>
    </select>
</div>

单选框选中：

1. <-- aa为值 -->

2. <input type="radio"  name="aa"  th:value="0" th:checked="${aa==0}"/>显示

3. <input type="radio"  name="aa"  th:value="1" th:checked="${aa==1 }"/>隐藏

4. <-- aa为对象属性 -->

5. <input type="radio"  name="aa"  th:value="0" th:field="*{aa}"/>显示

6. <input type="radio"  name="aa"  th:value="1" th:field="*{aa}"/>隐藏