我在登录时想把用户名，它的ID，还有他的mail_number（邮件数）全都放在session中去！
现在action中登录成功后还没返回前，把它们放进去？
action中的部分代码：
List list = memberdao.info(userName);
int mId = Integer.valueOf(list.get(mId)); //有错
HttpSession session = request.getSession();
session.setAttribute( "username ", userName);
memberdao.info（）方法中是这样的：
public List info(String username){
List list = new ArrayList();
ResultSet rs = this.doExcuteQuery( "select mId,mail_number from member where = ' "+username+ " ' ");
try {
while(rs.next()){
String mId = rs.getString( "mId ");
String mail_number = rs.getString( "mail_number ");
list.add(mId);
list.add(mail_number);
}
} catch (SQLException e) {
e.printStackTrace();
}
return list;
}
我改怎么改正？？？
------解决方案--------------------
你为什么要放到List里面呢,你没有用户bean吗,应该把用户放到List里面去
------解决方案--------------------
List <XXXBean> list = new ArrayList <XXXBean> ();
ResultSet rs = this.doExcuteQuery( "select mId,mail_number from member where = ' "+username+ " ' ");
try {
while(rs.next()){
XXXBean bean = new XXXBean();
bean.setMId(rs.getString( "mId "));
bean.setMailNumber(rs.getString( "mail_number "));
list.add(bean);
}
------解决方案--------------------
把从数据库得到的信息放到bean里面,不应该直接放到List,然后把bean再放到List,需要用的时候直接从List里面取