thymeleaf中不用自己去写checked="checked" selected="selected"这种代码，他自己会选。
input
<input type="text" class="form-control1" id="name" name="name" th:value="${user.name}">
select
<label class="col-sm-2 control-label">类别</label> <div class="col-sm-8"><select name="cId" id="cId" class="form-control1" ><option value="1" th:field="*{book.cId}">目录1</option><option value="2" th:field="*{book.cId}">目录2</option><option value="3" th:field="*{book.cId}">目录3</option><option value="4" th:field="*{book.cId}">目录4</option></select> </div>
radio（*{回显数据}）
<label for="isBoy" class="col-sm-2 control-label">是否男生</label><div id="isBoy" class="col-sm-8"><div class="radio-inline"><label><input name="isBoy" type="radio" value="1" th:field="*{book.isBoy}"/> 否</label></div><div class="radio-inline"><label><input name="isBoy" type="radio" value="0" th:field="*{book.isBoy}"/> 是</label></div></div>
参考：https://blog.csdn.net/tuntun1120/article/details/79806669
