用JSP+tomcat4+SQLserver做登陆模块时的问题
我的index模块:
<FORM ACTION= "login.jsp " METHOD= "POST ">
<table border= "0 " bgcolor= "#F2EDF8 ">
<tr bgcolor= "#EAE2F3 ">
<td bgcolor= "#E2D8EF "> 学号： </TD> <TD> <input NAME= "user " TYPE= "text " SIZE= "12 " maxlength= "12 "> </TD>
</tr>
<tr bgcolor= "#EAE2F3 ">
<td bgcolor= "#E2D8EF "> 口令： </TD> <TD> <input NAME= "password " TYPE= "password " SIZE= "10 " maxlength= "10 "> </TD>
</tr>
</table>
login.jsp的代码:
<%@ page contentType= "text/html;charset=gb2312 " %>
<%@ page import= "grad.util.user.*; "%>
<%@ page session= "true " %>
<html>
<head>
<title> login </title>
</head>
<body bgcolor= "#ffffff ">
<h1>
<%
String password=request.getParameter( "password ");
String usercode=request.getParameter( "user ");
//out.print(password+usercode);
op_user ope=new op_user();//构造用户管理对象
if(ope.isLogin(usercode,password)){//调用isLogin方法判断是否允许用户登录
user us=ope.getUserByUserCode(usercode);//允许用户登录则取得用户信息
session.setAttribute( "usercode ",usercode);//把用户编号写入session
response.sendRedirect( "student/index.html ");
}
else{
out.print( " <script language=\ "javascript\ "> alert(\ "请重新登录\ ") </script> ");
response.sendRedirect( "index.jsp ");
}
%>
</h1>
</body>
</html>
定义的user类:
package grad.util.user;
public class user {
public user (){
}
String id= " "; //用户名
String password= " "; //用户密码
public void setId(String id)
{
this.id=id;
}
public String getId()
{
return this.id;
}
public void setPassword(String password)
{
this.password=password;
}
public String getPassword()
{
return this.password;
}
}
登陆验证时用到的两个方法:
package grad.util.user;
import grad.util.DataBase;
import java.sql.*;
import java.util.*;
public class op_user{
public op_user(){
}
public user getUserByUserCode(String usercode)
{
Connection conn=null;
Statement st=null;
ResultSet rs=null;
String sql= "select * from user where id= ' "+usercode+ " ' ";
try
{
DataBase ds =new DataBase();
conn = ds.conn;
user us=new user();
rs = st.executeQuery(sql);
if (rs.next())
{
us.setId(rs.getString(1)); //???????
us.setPassword(rs.getString(2)); //?????????
}
return us;
}catch(Exception e){System.out.println(e.getMessage());return null;}
}
public boolean isLogin(String usercode,String password)
{
user a = this.getUserByUserCode(usercode);
if(a.getPassword().equals(password))
return true;
else
return false;
}
运行时提示没有返回值,在 if(a.getPassword().equals(password))
但上面的方法和类在编译的时候并没有错误
如果直接在
if(ope.isLogin(usercode,password)){...}
改成
if(true){...}
就能成功运行
请高手多多指教我这个菜鸟
[解决办法]
都不用看就知道是验证写错了,自己把a.getPassword()打印出来看看是啥不就知道了
