小弟我想实现每个登陆的人看到的表单内容不一样.可是遇到了有关问题.

我想实现每个登陆的人看到的表单内容不一样..可是遇到了问题..求助
我首先在goods表里设了一个外键userId，之后我在用户登录的地方用session存了user的信息...在goodsServlet里想要获取session的user的id值给userId...这样的想法对吧？
package com.web;

import java.io.IOException;

import javax.jms.Session;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.bean.Goods;
import com.bean.User;
import com.dao.GoodsDao;
import com.jspsmart.upload.Request;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;

public class AddGoodServlet extends HttpServlet {

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub

   
 SmartUpload smartUpload=new SmartUpload();
       Request req=smartUpload.getRequest();
       ServletConfig config=this.getServletConfig();
       smartUpload.initialize(config,request,response);
       try {
smartUpload.upload();
String good_name=req.getParameter("good_name");//一定要放在smartUpload.upload()之后
/*System.out.println("good_name的值为:"+good_name);*/
        String fixed_price=req.getParameter("fixed_price");
/*System.out.println("fixed_price的值为:"+fixed_price);*/
        double a=Double.valueOf(fixed_price);
String score=req.getParameter("score");
/*System.out.println("score的值为:"+score);*/
int b=Integer.parseInt(score);
com.jspsmart.upload.File smartFile=smartUpload.getFiles().getFile(0);
smartFile .saveAs("/productImages/"+smartFile.getFileName(),SmartUpload.SAVE_VIRTUAL);
String msg="Upload Success!";
request.setAttribute("msg", msg);

String userId=request.getSession().getId();
        int e=Integer.parseInt(userId);//这样写对么？
/*System.out.println("userId的值为:"+e);*/

Goods goods=new Goods();
goods.setGood_name(good_name);
goods.setFixed_price(a);
goods.setScore(b);
goods.setProduct_pic("productImages/"+smartFile.getFileName());
goods.setUserId(e);
GoodsDao dao=new GoodsDao();
dao.Savegoods(goods);



} catch (SmartUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();

}
       
     
     RequestDispatcher rd=request.getRequestDispatcher("/Goodlist");
       rd.forward(request, response);
       
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}
这样子之后报错为input string.....一堆东西..怎么回事呢...
------解决方案--------------------
当然错了，楼主还不会用getSession，你的user信息要通过Session的setAttribute/getAttribute方法设置和获取！