空对象 session,该怎么解决

空对象 session
以下是部分代码
shop.java中的getProduct

Java code

public Product getProduct(int proid){        Product pro = null;        if(proid!=0){            String sqlpro = "SELECT * from product WHERE PROID="+proid;            rs = exe.query(sqlpro);            try {                if(rs!= null){                    pro = new Product();                        rs.next();                        pro.setProid(rs.getInt("PROID"));                        pro.setContents(rs.getString("CONTENTS"));                        pro.setDescript(rs.getString("DESCRIPT"));                        pro.setName(rs.getString("NAME"));                        pro.setPrice(rs.getDouble("PRICE"));                        pro.setSalecount(rs.getInt("SALECOUNT"));                        pro.setSleprice(rs.getDouble("SALEPRICE"));                        pro.setSortid(rs.getInt("SORTID"));                        pro.setDate(rs.getDate("SALEDATE"));                    }                            } catch (SQLException e) {                e.printStackTrace();            }        }        return pro;    }

detailServlet

Java code

int proid = Integer.parseInt(request.getParameter("proid"));        Product pro = new Product();        pro = shop.getProduct(proid);        session.setAttribute(Contants.CUR_PRODUECT_KEY, pro);        response.sendRedirect("detail.jsp");

detail.jsp

Java code

Product pro = new Product();    pro = (Product)session.getAttribute(Contants.CUR_PRODUECT_KEY);    String str ="";    if(pro!=null)        out.print("not null");    if(pro == null)        out.print("go on");

为什么pro为Null

[解决办法]
不行吧 链接只是跳转 并没有触发form的提交 你去detailservlet里面设个断点 个人估计是不会进入detailservlet

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