request.getParameter("id")为什么不能得到值?
在页面2中request.getParameter("id")为什么得不到页面1中的值(始终为null)?
以下是代码?
页面2:
<%@ page contentType="text/html;charset=GBK" %>
<%@ page language="java" import="java.sql.*" %>
<jsp:useBean id="connDb" scope="page" class="quanxian_db.ConnOracle"/>
<%
String d_id=request.getParameter("id");
//connDb.executeUpdate("delete qx where qx_yonghuming="+d_id);
%>
页面1:
<%@ page contentType="text/html;charset=gb2312" %>
<%@ page language="java" import="java.sql.*" %>
<jsp:useBean id="connDb" scope="page" class="quanxian_db.ConnOracle"/>
<html>
<head>
<title>无标题文档</title>
</head>
<body>
<table width="50%" border="0" align="center">
<tr>
<td align="center"><font size="+3">用户维护</font></td>
</tr>
</table>
<hr>
<table width="93%" border="1" align="center">
<tr>
<th scope="col">
</th>
<th scope="col">
</th>
<th scope="col">
</th>
<th scope="col"> </th>
</tr>
<tr bgcolor="#ccccff">
<td width="30%">
<div align="center"> <font color="#000000" size="3" > 用户名</font> </div>
</td>
<td width="23%">
<div align="center"> <font color="#000000"> 权限</font> </div>
</td>
<td width="26%">
<div align="center"> <font color="#000000"> 备注</font> </div>
</td>
<td width="21%"></td>
</tr>
<%
// out.println(session.getAttribute("quanxian_xuanze"));
ResultSet RS_result=null;
RS_result=connDb.executeQuery("select * from qx");
//String quanxian="";
%>
<% while(RS_result.next())
{
//out.println(java.util.Date())
%>
<tr>
<td width="30%"> <div align="center"> <font color="#999966"> <b><%= RS_result.getString("qx_yonghuming") %> </b></font> </div> </td>
<td width="23%"> <div align="center"> <font color="#999966"> <b><%= RS_result.getString("qx_quanxiandengji") %> </b></font> </div> </td>
<td width="26%">
<div align="center"> <font color="#999966"> <b><%= RS_result.getString("qx_beizhu") %> </b></font> </div>
</td>
<td width="21%" align="center"><input type="submit" name="Submit" value=" 修 改 ">
<a href="shanchu.jsp?id=<%= RS_result.getString("qx_yonghuming") %>">删 除</a>
</td>
</tr>
<tr>
</tr>
<%
}
RS_result.close();
%>
</table>
<hr>
<form action="tianjia.jsp" method="post" >
<table width="93%" border="0" align="center" bgcolor="#ccccff">
<tr>
<td width="14%" align="left"><font color="#990000" size="4">添加项目</font></td>
<td width="31%" align="left"><font color="#ff0033"><b><font color="#000000">用户</font>
<input name="text_yonghu" type="text">
</b></font></td>
<td width="13%" align="left"><font color="#000000"><b>权限</b></font>
<font color="#ff0033"><b>
<select name="select_quanxian" >
<option value="A">A</option>
<option selected>B</option>
<option>C</option>
<option>D</option>
</select>
</b></font></td>
<td width="31%" align="left"><font color="#ff0033"><b><font color="#000000">备注</font>
<input name="text_beizhu" type="text">
</b></font></td>
<td width="11%" align="center">
<input type="submit" name="Submit" value=" 添 加 " >
</td>
</tr>
</table>
</form>
</body>
</html>