jsp的乱码问题啊~~~~~是页面的乱码~~~~~

代码如下:<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>图书管理系统</title>
</head>
<%@include file="head.jsp"%>
<%request.setCharacterEncoding("gb2312");%>
<body>
<table width="783" height="328" border="1">
<tr>
<th width="252" scope="col"><table width="249" height="318" border="0">
<tr>
<th height="287" scope="col">入 库</th>
</tr>
<tr>
<td><form name="form1" method="post" action="InData/InData">
<div align="center">
<input type="submit" name="Submit" value="提交">
</div>
</form></td>
</tr>
</table></th>
<th width="260" scope="col"><table width="249" height="318" border="0">
<tr>
<th height="287" scope="col">借 书 </th>
</tr>
<tr>
<td><form name="form1" method="post" action="">
<div align="center">
<input type="submit" name="Submit" value="提交">
</div>
</form></td>
</tr>
</table></th>
<th width="257" scope="col"><table width="249" height="318" border="0">
<tr>
<th height="287" scope="col">还 书 </th>
</tr>
<tr>
<td><form name="form1" method="post" action="">
<div align="center">
<input type="submit" name="Submit" value="提交">
</div>
</form></td>
</tr>
</table></th>
</tr>
</table>
<hr>
</body>
<%@include file="foot.jsp"%>
</html>显示出来的中文全都是问号~~~~连表单的value值都是问号~~~~~
大虾们~！帮帮我吧~~~~我晕了~