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分享用request.getParameter("")得到的参数为什么是空的？
我在一个网页中,用到另外一个网页的值，我使用request.getParameter("aa")，为什么得到的全是空值？
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Ronanljy 2004-09-11
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初学者容易犯的错误。
dafei0320 2004-09-11
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呵呵！form里就一个提交啊？
值都没有？
快放进去吧！
值都没有？
快放进去吧！
tangbow 2004-09-10
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将文本狂放到 form表单里 就好了
yinliangzhi 2004-09-10
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我太粗心了!打自己一个耳光!
phptong 2004-09-10
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晕，你没把text这个表单元素没有在form表单里，传给另个页面当然是null值了，做事要仔细
yinliangzhi 2004-09-10
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ding
yinliangzhi 2004-09-10
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第一个页面:
<%@ page contentType="text/html;charset=GBK" %>
<%@ page language="java" import="java.sql.*" %>
<!-- !!!<%@ page import="ConnOracle" %> -->
<jsp:useBean id="connDb" scope="page" class="ConnOracle"/>
<html>
<head>
<title>无标题文档</title>
</head>
<body>
<!--<form name="form1" method="post" action="">-->
<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="#ff0033" size="3" > <b> 用户名</b></font> </div>
</td>
<td width="23%">
<div align="center"> <font color="#ff0033"> <b> 权限</b></font> </div>
</td>
<td width="26%">
<div align="center"> <font color="#ff0033"> <b> 备注</b></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="#ff0033"> <b><%= RS_result.getString(1) %> </b></font> </div> </td>
<td width="23%"> <div align="center"> <font color="#ff0033"> <b><%= RS_result.getString(2) %> </b></font> </div> </td>
<td width="26%">
<div align="center"> <font color="#ff0033"> <b><%= RS_result.getString(3) %> </b></font> </div>
</td>
<td width="21%" align="center"><input type="submit" name="Submit" value=" 修 改 ">
<input type="submit" name="Submit" value=" 删 除 ">
</td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<%
}
RS_result.close();
%>
</table>
<hr>
<table width="93%" border="0" align="center">
<tr bgcolor="#ccccff">
<td align="left" bgcolor="#ccccff"><font size="4">添加项目</font></td>
</tr>
</table>
<table width="93%" border="0" align="center">
<tr>
<td width="31%" align="left"><font color="#ff0033"><b>用户
<input name="textyonghu" type="text">
</b></font></td>
<td width="15%" align="left"><font color="#ff0033"><b>权限</b></font>
<font color="#ff0033"><b>
<select name="selectquanxian" >
<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>备注
<input name="textbeizhu" type="text">
</b></font></td>
<td width="23%" align="center">
<form action="tianjia.jsp" method="post" >
<input type="submit" name="Submit" value=" 添加" >
</form>
</td>
</tr>
</table>
<!--</form>-->
</body>
</html>
第二个页面：
<%@ page contentType="text/html;charset=GBK" %>
<%@ page language="java" import="java.sql.*" %>
<!-- !!!<%@ page import="ConnOracle" %> -->
<jsp:useBean id="connDb" scope="page" class="ConnOracle"/>
<%
String tianjia_yonghuming=request.getParameter("textyonghu");
String tianjia_quanxian="C";
session.setAttribute("quanxian_xuanze","xx");//request.getParameter("select_quanxian"));
String tianjia_beizhu=request.getParameter("textbeizhu");
if (tianjia_yonghuming ==null){
tianjia_yonghuming="aa";
}
//if (tianjia_yonghuming != null && tianjia_yonghuming.length()>0){
//ResultSet RS_result=null;
//RS_result=connDb.executeQuery("select * from qx");
String sql ="insert into qx values"+"("+"'"+tianjia_yonghuming+"','"+tianjia_quanxian+"','"+tianjia_beizhu+"' "+")";
// String sql ="insert into qx values('xx','B','ff')";
connDb.executeUpdate(sql);
//}
%>
<jsp:forward page="qx.jsp"/>
<%@ page contentType="text/html;charset=GBK" %>
<%@ page language="java" import="java.sql.*" %>
<!-- !!!<%@ page import="ConnOracle" %> -->
<jsp:useBean id="connDb" scope="page" class="ConnOracle"/>
<html>
<head>
<title>无标题文档</title>
</head>
<body>
<!--<form name="form1" method="post" action="">-->
<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="#ff0033" size="3" > <b> 用户名</b></font> </div>
</td>
<td width="23%">
<div align="center"> <font color="#ff0033"> <b> 权限</b></font> </div>
</td>
<td width="26%">
<div align="center"> <font color="#ff0033"> <b> 备注</b></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="#ff0033"> <b><%= RS_result.getString(1) %> </b></font> </div> </td>
<td width="23%"> <div align="center"> <font color="#ff0033"> <b><%= RS_result.getString(2) %> </b></font> </div> </td>
<td width="26%">
<div align="center"> <font color="#ff0033"> <b><%= RS_result.getString(3) %> </b></font> </div>
</td>
<td width="21%" align="center"><input type="submit" name="Submit" value=" 修 改 ">
<input type="submit" name="Submit" value=" 删 除 ">
</td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<%
}
RS_result.close();
%>
</table>
<hr>
<table width="93%" border="0" align="center">
<tr bgcolor="#ccccff">
<td align="left" bgcolor="#ccccff"><font size="4">添加项目</font></td>
</tr>
</table>
<table width="93%" border="0" align="center">
<tr>
<td width="31%" align="left"><font color="#ff0033"><b>用户
<input name="textyonghu" type="text">
</b></font></td>
<td width="15%" align="left"><font color="#ff0033"><b>权限</b></font>
<font color="#ff0033"><b>
<select name="selectquanxian" >
<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>备注
<input name="textbeizhu" type="text">
</b></font></td>
<td width="23%" align="center">
<form action="tianjia.jsp" method="post" >
<input type="submit" name="Submit" value=" 添加" >
</form>
</td>
</tr>
</table>
<!--</form>-->
</body>
</html>
第二个页面：
<%@ page contentType="text/html;charset=GBK" %>
<%@ page language="java" import="java.sql.*" %>
<!-- !!!<%@ page import="ConnOracle" %> -->
<jsp:useBean id="connDb" scope="page" class="ConnOracle"/>
<%
String tianjia_yonghuming=request.getParameter("textyonghu");
String tianjia_quanxian="C";
session.setAttribute("quanxian_xuanze","xx");//request.getParameter("select_quanxian"));
String tianjia_beizhu=request.getParameter("textbeizhu");
if (tianjia_yonghuming ==null){
tianjia_yonghuming="aa";
}
//if (tianjia_yonghuming != null && tianjia_yonghuming.length()>0){
//ResultSet RS_result=null;
//RS_result=connDb.executeQuery("select * from qx");
String sql ="insert into qx values"+"("+"'"+tianjia_yonghuming+"','"+tianjia_quanxian+"','"+tianjia_beizhu+"' "+")";
// String sql ="insert into qx values('xx','B','ff')";
connDb.executeUpdate(sql);
//}
%>
<jsp:forward page="qx.jsp"/>
wizardnjau 2004-09-10
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这种情况既然已经知道是null的话就可以找找原因了嘛，无非就是两个页面，要是帖出代码就很快能够解决
weepp 2004-09-10
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就是吗？！
flyxxxxx 2004-09-10
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表单中如果有<input type="file">那用这种方法得到的一定是null(要使用smartupload)
tangbow 2004-09-10
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94
贴出前面一个代码
贴出前面一个代码
phptong 2004-09-10
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把前一个页面的代码贴出来看看，就是要传值出来的页面
