jsp前端的值传回不到后端

<%-- 代码处--%>

                        <tbody>
                            <c:forEach items="${bList}" var="book" varStatus="status">
                                <tr>
                                    <td>${status.index+1}td>
                                    <td>${book.typeName}td>
                                    <td>${book.bookName}td>
                                    <td>${book.author}td>
                                    <td>${book.press}td>
                                    <td>${book.num}td>
                                    <td><button type="button" class="btn btn-warning btn-xs"
                                    data-toggle="modal" data-target="#updateModal" id="btn_update"
                                    onclick="showInfo2('${book.bid}','${book.tid}','${book.bookName}','${book.author}','${book.press}','${book.num}')">
                                        修改button>
                                <button type="button" class="btn btn-danger btn-xs"
                                    onclick="deletebook(${book.bid})">删除button>td>
                                tr>
                            c:forEach>

                        tbody>
                    table>
                div>
            div>
        div>
    div>
div>

<form class="form-horizontal" method="post"
    action="/books/book?method=update">
    
    <div class="modal fade" id="updateModal" tabindex="-1" role="dialog"
        aria-labelledby="updateModalLabel" aria-hidden="true">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal"
                        aria-hidden="true">×button>
                    <h4 class="modal-title" id="updateModalLabel">修改图书信息h4>
                div>
                <div class="modal-body">

                    

                    <input name="bid" id="updateBookId" type="hidden"/>
                    <div class="form-group">
                        <label for="bookName" class="col-sm-3 control-label">图书名称label>
                        <div class="col-sm-7">
                            <input type="text" class="form-control" id="updateBookName"
                                name="bookName" placeholder="请输入图书名称"> <label
                                class="control-label" for="updateBookName"
                                style="display: none;">label>
                        div>
                    div>

                    <div class="form-group">
                        <label for="updateBookType" class="col-sm-3 control-label">图书类型label>
                        <div class="col-sm-7">
                            <select class="form-control" id="updateBookType" name="tid"
                                onPropertyChange="showValue(this.value)">
                                <option value="-1">请选择option>
                                <c:forEach items="${typeList}" var="type" varStatus="status">
                                    <option value="${type.tid}">${type.typeName}option>
                                c:forEach>
                            select> 
                            <label class="control-label" for="updateBookType"
                                style="display: none;">label>
                        div>
                    div>

                    <div class="form-group">
                        <label for="updateAutho" class="col-sm-3 control-label">作者名称label>
                        <div class="col-sm-7">
                            <input type="text" class="form-control" id="updateAutho"
                                name="author" placeholder="请输入作者名称"> <label
                                class="control-label" for="updateAutho" style="display: none;">label>
                        div>
                    div>

                    <div class="form-group">
                        <label for="updatePress" class="col-sm-3 control-label">出版社label>
                        <div class="col-sm-7">
                            <input type="text" class="form-control" id="updatePress"
                                name="press" placeholder="请输入出版社"> <label
                                class="control-label" for="updatePress" style="display: none;">label>
                        div>
                    div>
                    <div class="form-group">
                        <label for="updateNum" class="col-sm-3 control-label">总数量label>
                        <div class="col-sm-7">
                            <input type="text" class="form-control" id="updateNum"
                                name="num" placeholder="请输入总数量"> <label
                                class="control-label" for="updatePress" style="display: none;">label>
                        div>
                    div>
                div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">关闭button>
                    <button type="submit" class="btn btn-primary">修改button>
                div>
            div>
            
        div>
        
    div>

序号	图书类型	图书名称	作者名称	出版社	总数量	操作