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jsp跨页面值传输请求帮助

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jsp跨页面值传输请求帮助

发表于：2007-06-06 10:32:41 楼主

我想把登陆的用户名从第一个页面传送到第三个页面.用session实现.
第一个页面的相关代码
<% string username=request.getparameter（ "username ");
string pwd=request.getparameter（ "pwd ");
resultset rs=null;
string sql= "select * from userinfo where username= ' "+username+ " ' and pwd= ' "+pwd+ " ' ";
rs=user.ＥＸＥＣutequery（sql);
session.setattribute（ "username ",rs.getstring（ "username ");
if（rs.next（))
{out.print（ "ok ");
response.sendredirect（ "main.jsp ");
);
}
else
{ string msg= "用户或密码错误 ";
out.println（msg);
response.sendredirect（ "index.jsp ");
}
rs.close（);
%>
第三个页面的相关代码
<% string mn=session.getattribute（ "username ");
resultset rs=null;
string sql= "select mnum from userinfo where username= ' "+mn+ " ' ";
rs=adnum.ＥＸＥＣutequery（sql);
if（rs.next（))
{ string adnu=（string)rs.getstring（ "adnum ");
if（adnu== "1 ")
{response.sendredirect（ "guanl.jsp ");
}
}
else{
string msg= "你没有管理员权限 ";
out.print（msg);
response.sendredirect（ "../main.jsp ");
}
rs.close（);
%>
错误是:
org.apache.jasper.jasperexception: unable to compile class for jsp:

an error occurred at line: 9 in the jsp file: /biyesheji/adnumcheck.jsp
type mismatch: cannot convert from object to string
6: <title> adnumcheck </title>
7: <jsp:usebean class= "sqldb.mydbbean " id= "adnum " scope= "page "> </jsp:usebean>
8: </head>
9: <% string mn=session.getattribute（ "username ");
10: resultset rs=null;
11: string sql= "select mnum from userinfo where username= ' "+mn+ " ' ";
12: rs=adnum.ＥＸＥＣutequery（sql);

求助各位高手

发表于：2007-06-06 10:35:051楼得分:0

<% string mn=session.getattribute（ "username ");
这句，改为 <% string mn=（string）session.getattribute（ "username ");试一下。

发表于：2007-06-06 10:37:362楼得分:0

对

发表于：2007-06-06 10:47:373楼得分:0

改后还有错:
错为
org.apache.jasper.jasperexception: exception in jsp: /biyesheji/adnumcheck.jsp:14

11: string sql= "select mnum from userinfo where username= ' "+mn+ " ' ";
12: rs=adnum.ＥＸＥＣutequery（sql);
13: if（rs.next（))
14: { string adnu=（string)rs.getstring（ "adnum ");
15: if（adnu== "1 ")
16: {response.sendredirect（ "guanl.jsp ");
17: }

发表于：2007-06-06 10:52:554楼得分:0

改成 string adnu=rs.getstring（ "mnum ");

发表于：2007-06-06 10:53:275楼得分:0

string adnu=rs.getstring（ "mnum ");

发表于：2007-06-06 10:56:546楼得分:0

getstring返回的就是string，还转型干吗?而且比较adnu字符串为1不能用==而要用 "1 ".equals（adnu)的说，没看过基础语法知识啊？

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