主要是GoddessDao类里面query函数的问题！  

public List<Goddess> query() throws SQLException{

Connection conn = DBUdil.getConnection();

Statement stmt = conn.createStatement(); 

ResultSet rs = stmt.executeQuery("select user_name from imooc_goddess");

List<Goddess> gs=new ArrayList<Goddess>();

Goddess g = null;

while(rs.next())

{

g = new Goddess();

g.setUser_name(rs.getString("user_name"));

g.setAge(rs.getInt("age"));

gs.add(g);

}

return gs;

}